Download Sample Question Paper-2 - SARASWATI CHEMISTRY POINT

SARASWATI STUDY POINT
Sample Question Paper-1
1.
2.
3.
4.
5.
Section—A
Why are bags of chips flushed with nitrogen gas?
(1)
Two resistors of 20  and 40  are connected in parallel in an electric circuit. How does the current
passing through the tow resistors compare?
(1)
Why do we apply paint on iron articles?
(1)
What is the frequency of alternating current in India?
(1)
Give reason for the following:
a. Ionic compounds have usually high melting and boiling points.
b. Metals are good conductors of electricity whereas non-metals are not.
(2)
6. In an electric circuit with a resistance wire & a cell, the current flowing is I. what would happen to this current if
the wire is replaced by another thicker wire of same material and same length. Give reason.
(2)
7. Name the acid present in
a. Ant sting
(ii) Tamarind
(2)
8. Explain the process of nutrition in amoeba.
(2)
9. Which is the largest digestive gland present in human body? What are the names and function of its secretion?
(2)
10. When a 22 V battery is connected across a resistor, 2.2 mA current flows in the circuit? Find the resistance of the
resistor.
(2)
11. Write the chemical name and formula of bleaching powder. How is it prepared?
(2)
12. A Student performs an experiment to study the magnetic effect of current around a current carrying straight
conductor with the help of a magnetic compass. He reports that:
a. The degree of deflection of the magnetic compass increases when the compass is moved away from the
conductor.
b. The degree of deflection of the magnetic compass increases when the current through the conductor is
increased.
Which of the above observations of the student appears to be wrong and why?
(2)
13. What do you mean by ‘ocean thermal energy’? How electricity can be generated from the energy?
(2)
14. (a) Name the chemical substance which is present in ant sting.
(b) A compound which is prepared from gypsum has the property of hardening when mixed with proper quantity
of water.
Indentify the compound write the chemical equation of its preparation.
(3)
15. (a) What do you see when a magnesium ribbon is burnt? Is magnesium oxidized or reduced in this reaction?
(b) Define corrosion.
(3)
16. An air conditioner of rating 200 W; 220 V is operated in a domestic circuit (220 V) that has a current rating of 5
A. What result do you expect? Justify your answer.
(3)
17. (a) Give an example of plant hormone that promotes growth.
(b)Name a plant hormone that promotes cell division.
(c) Give an example of plant hormone that inhibits growth.
(3)
18. Draw Diagram of human brain & label any four parts. Write one function each of any two parts.
(3)
19. (a) Explain the function of electric fuse.
(b) An electric bulb is marked 60 W. What does this mean? How much energy does it consume if used for 1
hour?
(3)
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20. A coil made of insulated copper wire is connected to a galvanometer. What will happen to the deflection of the
galvanometer if this coil is moved towards a stationary bar magnet & then moved away from it? Give reason for
you answer & name the phenomenon involved.
(3)
21. (a) Why metals are not found in their free state generally?
(b) If a strip of aluminum with scratched clean surface is dipped into an aqueous solution of copper sulphate for
little time, the surface of the strip becomes brownish. What is the reason for this? Write the balanced equation
for the reaction?
(3)
22. In the electrolysis of water;
a. Name the gas collected at the cathode and anode
b. Why is the volume of gas collected at one electrode double the other?
c. Why is the few drops of dil. H2SO4 added to the water?
(3)
23. (i) Account for the following:
a. White silver chloride turns grey in sunlight.
b. Brown coloured copper powder on heating in air turns into black coloured substance.
(ii) What do you mean by;
a. Displacement reaction
b. Reduction reaction
c. Combination reaction
Write balanced chemical equations.
(5)
24. (a) Which rule helps to find the force on a current carrying conductor in a magnetic field?
(b) State the rule.
(c) Name the three factors on which the forces on the current carrying conductor depend?
(5)
25. (a) Name two hormones secreted by pancreas. Write one function of each hormone.
(b) How does our body respond when alternative is secreted into the blood?
(c) Site an example to explain feedback mechanism for regulation of hormonal secretion.
(5)
Section—B
26. The blue colour of the aqueous copper sulphate solution can be changed to pale green by immersing which of
the following metal rod in it?
(a) Iron
(ii) Zinc
(iii) Silver
(iv) None of these
(1)
27. Respiration occurs only in living cells like germinating seeds because:
(a) Living cells need ATP
(c) Living cells have O2
(b) Living cells have glucose
(d) All these.
(1)
28. Coverslip is put on the slide very gently to avoid:
(a) Entry of air bubbles
(c) Oozing of Glycerine
(b) Crushing of the material
(d) None of these.
(1)
29. Using the high power objective of a microscope an epidermal leaf shows:
(a) Stomata surrounding many guard cells.
(b) Stomata surrounded by a pair of guard cells each.
(c) Stomata surrounded by several epidermal cells.
(d) Stomata surrounded by several guard cells each.
(1)
30. The teacher instructed a student to place a healthy potted shoe flower plant in a dark room for 24 hours prier to
an experiment on photosynthesis. The purpose of placing it in a dark room is:
(a) To increase the intake of CO2.
(c) To destarch the leaves
(b) To activate the chloroplasts in leaves
(d) To denature the enzymes in the leaves (1)
31. A portion of destarched leaf of potted plant was covered with a black strip of paper. The plant was exposed to
sunlight for six hours and then tested for starch. It was observed that:
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(a) The surface of the metal turns shining
(b) The reaction mixture turns milky
(c) Odour of chlorine is observed
(d) A colourless and odourless gas evolves with bubbles.
(1)
32. When an iron nail, rubbed with sand paper, is dipped in copper sulphate solution, we observe that copper gets
deposited:
(a) First on the lower part of the nail and proceed to the upper part,
(b) First on the upper part of the nail and proceed ot the lower part,
(c) On the entire surface of the nail,
(d) On the nail in small patches.
(1)
33. A more reactive metal displaces a less reactive metal from the aquous solution of the latter. From the following
sets tell which one represents a correct picture of both the possible ‘’ reaction and impossible ‘X’ reactions
between metals and the solutions of different salts.
Metals
Al2(SO4)3
CuSO4
FeSO4
ZnSO4



(A) Al
X
X
X
X

(B) Cu


X
X
(C) Fe

X

X
(D) Zn
(1)
34. The current flowing through a conductor and the potential difference across its two ends are a s per readings of
ammeter and the voltmeter shown below. The resistance of the conductor would be:
(a) 0.02 
(b) 0.24 
(c) 20.0 
(d) 24.0 
(1)
35. A metal powder was added to dil. HCl and dil. NaOH solutions taken in separate test tubes. On making the
contents react in both the test tubes, Hydrogen gas was formed in both the cases. The metal used will be:
(a) Cu
(b) Zn
(c) Fe
(d) Pb
(1)
36. Four students were given colourless liquids-water, lemon juice and a mixture of water and lemon juice
respectively. After testing these liquids with pH paper following sequences in colour change of pH paper were
reported:
(a) Blue, Red & Green
(b) Orange, Green & Green
(c) Green, Red & Red
(d) Red, Red & Green
(1)
37. A part of destarched leaf of a potted plant was covered with black paper strips on both sides and the plant was
kept in sunlight for 8 hours. The leaf was then tested with iodine after boiling it in alcohol,. Only the uncovered
part of the leaf turned blue black. The inference is that:
(a) CO2 is necessary for photosynthesis
(c) Light is necessary for photosynthesis.
(b) Chlorophyll is necessary for photosynthesis
(d) Water is necessary for photosynthesis.
(1)
38. In order to test the presence of starch, the leaf is dipped in a test tube containing a liquid to remove the
chlorophyll. The liquid is:
(i) Water
(ii) NaCl
(iii) Alcohol
(iv) None of these
(1)
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39. Four students observed the epidermal peel of leaf under a high power microscope and make the sketches as
below. The correct sketch would be:
(a) I
(b) II
(c) III
(d) IV
(1)
40. In an experiment on photosynthesis, a student fixed a strip of black paper on the dorsal surface of a leaf in the
morning, in the evening she tested the leaf for starch. The result was:
(a) The dorsal surface of the leaf was white but the ventral surface turned blue.
(b) Both the surface of the leaf was white.
(c) The entire leaf turned blue black.
(d) The entire leaf remained white.
41. A leaf from a destarched plant is covered with black paper strip as shown in figure. The starch test is done on the
leaf after 8 hours.
The results will be as shown in diagram:
(i)
a
(ii)
b
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d
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Sample Question Paper-2
Section—A
1. Write electronic configuration of an element having atomic number 11.
(1)
2. Name the device that directly converts solar energy to electric energy.
(1)
3. What is biomass?
(1)
4. What happens to resistance of a conductor when temperature is increased?
(1)
5. What are permanent magnet & electromagnet? Give two uses of each.
(2)
6. Oxidation and reduction processes occur simultaneously. Justify this statement with the help of an example.
(2)
7. How washing soda is prepared from baking soda. Write balanced chemical equation. Give two uses of washing
soda.
(2)
8. A substance X, which is an oxide of a metal, is used intensively in the cement industry. This element is present
in bones also. On treatment with water it forms a solution which turns red litmus blue. Identify X and also write
the chemical reactions involved.
(2)
9. Which is the internal energy reserve in plants? Do the animals have the same energy reserve?
(2)
10. What are exothermic and endothermic reactions? Explain with help of one example each.
(2)
11. (a) What material is used in making the filament of an electric bulb?
(b) Name the characteristics which make it suitable for this.
(2)
12. How are ammeters and voltmeters connected in a circuit? What do they help us measure?
(2)
13. What is the (a) highest (b) lowest resistance that can be secured by combining four coils of resistance 4 , 8 ,
12  and 24 .
(2)
14. What is nuclear energy? Give two advantages and two hazards of nuclear energy.
(3)
15. (a) What do you mean by olfactory indicators?
(b) Zinc is an amphoteric metal. Justify with reaction.
(3)
16. Most metals do not react with bases but zinc metal does. Suggest a reason and write an equation for the
reaction between zinc and NaOH.
(3)
17. Write the balanced chemical equations for the following reactions:
a. Sodium carbonate on reaction with hydrochloric acid in equal molar concentrations gives sodium chloride
and sodium hydrogen carbonate.
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18.
19.
20.
21.
22.
23.
24.
25.
b. Sodium hydrogen carbonate on reaction with hydrochloric acid gives sodium chloride, water and liberates
carbon dioxide.
(3)
(a) Using a simple experiment, how can you prove that magnesium is placed above Zinc in the reactivity series?
(b)Why copper metal cannot liberate Hydrogen when reacting with dil. HCl?
(3)
A brown substances ‘X’ on heating in air forms a substance ‘Y’. When hydrogen gas is passed over heated ‘Y’, it
again changes back into ‘X’.
(a) Name the substance X & Y
(b) Write the chemical equations.
(c) Name the chemical processes occurring during both the changes
(a) What do you understand by the term hydrated salt?
(3)
(b) Give two examples of hydrated salt which are white and state their chemical formula.
(3)
Salt A commonly used in bakery products on heating gets converted into another salt B which itself is used for
removal of hardness of water & a gas C is evolved. The gas C when passed through lime water turns it milky.
Identify A, B & C.
(3)
Name various plant hormones. Give one function of each.
(3)
(a) List three events that occur during the process of photosynthesis. State in brief the role of stomata in this
process.
(b) Describe an experiment to show that sunlight is essential for photosynthesis.
(5)
(a) State Fleming’s left hand rule. With a labeled diagram.
(b) A coil of insulated copper wire is connected to a galvanometer. What happens if a bar magnet is:
a. Pushed into the coil.
c. held stationary inside the coil.
b. Withdrawn from inside the coil.
(5)
(a) Describe an experiment with a diagram to show that force is exerted on a current carrying conductor when
placed perpendicular in a magnetic field.
(b) How will this force change if current in the conductor is increased?
(c) Name a device that uses the above principle.
(5)
Section—B
26. The current flowing through a resistor connected in an electric circuit and the potential difference developed
across its ends are shown in the diagrams:
(i) 25
(ii) 20
(iii) 10
(iv)15
(1)
27. When an pH paper is dipped in a solution, the colour of pH paper changes to deep red. What will be the
possible pH of the solution?
(a) 2
(b) 6
(c) 8
(d) none of these
(1)
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28. A student took the following samples to find out their pH using pH paper. The teacher remarked that one of the
samples taken was not proper. The teacher was referring to:
(a) Dilute hydrochloric acid
(c) Lemon juice
(b) Washing soda
(d) Soap solution
(1)
29. The correct way of connecting the ammeter & voltmeter with a series combination of to resistors in a circuit for
finding their equivalent resistance is shown in diagram:
(i) a
(ii) b
(iii) c
(iv) d
(1)
30. Diagram showing a microscopic view of epidermal tissue:
(1)
(i) Is correct in all aspects
(ii) Is wrong because the guard cells are directed
backwards
(iii) Is wrong because stoma is not shown
(iv) Is correct because two guard cells stomata are
present.
31. What is the right procedure to remove chlorophyll form a destarched leaf:
(1)
(a) Boil the destarched leaf in lime water
(c) Boil the destarched leaf in water only
(b) Boil the destarched leaf in alcohol
(d) Boil the destarched leaf in a mixture of alcohol &
water.
32. Four solutions I, II, II & IV were given to a student to test their acidic or basic nature by using pH papers. He
observed that the colour of pH paper turned to red, blue, green & orange respectively when dipped in four
solutions. The correct conclusion made by the statement would be:
(a) I, II & III are acidic
(c) II, III & IV are acidic
(b) I & Iv are acidic
(d) II & IV are acidic
(1)
33. While preparing a temporary stained mount of a leaf epidermal peel, the extra stain is removed by:
(a) Washing with water
(c) Soaking with filter paper
(b) Washing with CaCl2 solution
(d) Absorbing with cotton wool
(1)
34. A student adds a few drops of the universal indicator to a solution of dilute
hydrochloric acid in the way shown here. He would observe that the colour
of the solution changes from colourless to :
(a) Red
(c) Yellow
(b) Violet
(d) Green
(1)
35. Which of the following experimental set ups is correct for verification of ohm’s law?
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(i) a
(ii) b
(iii) Both a & b
(iv) Neither a nor b
(1)
36. What is the effect of HCL on litmus?
(a) Red turns into blue
(c) Blue turns into red
(b) No effect on both colours
(d) Shows an effect on both blue & red litmus
(1)
37. In an experiment to show that CO2 is given out during respiration the chemical filled in the small test tube is:
(a) Alcohol
(b) KOH
(c) Lime water
(d) Iodine solution.
(1)
38. A student has to connect 4 cells of 1.5 V each to form a battery of voltage 6 V.
(i) a
(ii) b
(iii) c
(iv) d
(1)
39. Which one is not observed when aluminium is added to a solution of copper sulphate?
(a) The solution is blue in the beginning.
(c) The final solution becomes light green.
(b) The final solution becomes colourless
(d) A brown mass is deposited on the surface of aluminium.
(1)
40. On adding a few drops of base to distilled water the pH will become:
(a) Less than 7
(c) More than 7
(b) Remain 7
(d) pH does not change.
(1)
41. A well stained leaf peel preparation when focused under high power of the microscope would, show:
(a) Epidermal cells, stomata, guard cell each with one nucleus & many chloroplasts.
(b) Epidermal cells, stomata, guard cell with many nuclei & one chloroplast cell.
(c) Stomata and guard cells without nuclei or chloroplasts.
(d) Stomata, but no guard cells or epidermal cells.
(1)
Sample Question Paper-3
Section—A
1. A wire of resistivity ‘p’ is pulled to double its length. What will be its new resistivity?
(1)
2. What is meant by skeletal equation?
(1)
3. A non-metal X exists in two different forms Y and Z. Y is the hardest natural substances, whereas Z is a good
conductor of electricity. Identify Y and Z.
(1)
4. What is the brown coloured gas evolved when lead nitrate crystals are heated in dry test tube
(1)
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5. How would the reading of (V) change if it is connected between B and C?
(
2
)
6. (i) What do you understand by the term pH of a solution?
(ii) What is the pH of distilled water and common salt solution?
(2)
7. What is the role of fuse, used in series with any electrical appliance. Why should a fuse with defined rating not
be replaced by one with a larger rating?
(2)
8. Fresh milk has a pH of 6. How do you think the pH will change as it turns into curd? Explain.
(2)
9. Why does the cord of an electric heater not glow while the heating element does?
(2)
10. How is the process of transpiration useful to plant?
(2)
11. What is meant by thermal decomposition reaction? Explain with an example.
(2)
12. Mention the components of the transport system in highly organized plants. State the functions of these
components.
(2)
13. On mixing solutions of lead nitrate and potassium iodide in a test tube:
(i)
Write the chemical equation involved in the balanced form.
(ii)
What is the colour of the precipitate? Name the precipitate.
(2)
14. (a) Which hormone is secreted when growing plants detect light?
(b) Why do plants appear to bend towards light?
(3)
15. What is biomass? Draw a schematic diagram of biogas plant. Give the composition of biogas.
(3)
16. What is reflex are? Draw diagram of reflex are. What is the role of the brain in reflex action?
(3)
17. How will the magnetic field produced in a current carrying a circular coil change if we:
(a) Increase the value of current
(c) Increase the no. of turns of the coil
(b) Increase the distance from the coil
(3)
18. State Fleming’s Right hand rule. Give one application of this rule. What is SI unit of induced current?
(3)
19. Compare the nervous & hormonal systems for control and co-ordination in human beings.
(3)
20. Define electric current and state its SI unit. With the help of Ohm’s law explain the meaning of 1 Ohm
resistance.
(3)
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21. (a) What is decomposition reaction?
(b) What type of reaction will occur when silver chloride is exposed to sunlight?
(c) Identify the type of the reaction, when lead (II) Nitrate solution is mixed with Potassium Iodide solution.
(3)
22. Account for the following:
a. Aluminium is more reactive than iron. But its corrosion is less than iron.
b. Hydrogen gas is not evolved when zinc metal reacts with dil. HNO3
c. Carbon is not used for reducing aluminium from aluminium oxide.
(3)
23. (a) Explain an activity to show that a current carrying conductor experiences a force when placed in a magnetic
Electron
field.
(b) State the rule which given the direction of force acting on the conductor.
Magnetic
field
(c) An electron moves perpendicular to a magnetic field as shown in the figure.
What would be the direction of force experienced on the electron?
(5)
24. (a) A positively charged particle projected towards west is deflected towards north by a magnetic field. What is
the direction of the magnetic field?
(b) Draw the magnetic field lines of the field produced due to a current carrying circular loop.
(c) State the law used to find the directions of magnetic field around a straight current carrying conductor.
(5)
25. (a) Draw a schematic representation of transport & exchange of oxygen & CO2 in human body.
(b) What is meant by double circulation?
(c) Mention two differences between arteries and veins.
(5)
Section—B
26. To determine the equivalent resistance of three resistor, when connected in a parallel arrangement, four
students the resistors as follows:
The correct set up is that of student:
(i)
a
(ii)
b
(iii)
c
(iv)
d
(1)
27. The leaf is boiled in alcohol for a few minutes using water bath, it is essential because:
(a) Alchohol is highly volatile
(c) Alcohol gives the nutrients to the leaf
(b) Alchohol dissolves the chlorophyll & decolourises the leaf. (d) Alcohol cleans the le
(1)
28. Out of the four circuits shown for studying the dependence of the current on the potential difference across a
resistor. The correct circuit is:
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(i)
(ii)
a
b
(iii)
(iv)
c
d
(1)
29. Zinc granules were added to zinc sulphate, copper sulphate, aluminium sulphate & iron sulphate solutions as
shown below. You would observe the deposition of metal on zinc in beakers:
(a) I and II
(b) II and IV
(c) I and II
(d) III and IV
(1)
30. If a student while studying the dependence of current on the potential difference keeps the circuit closed for a
long time to measure the current and potential difference, then:
(a) Ammeter’s zero error will change.
(b) Ammeter will give more reading.
(c) Voltmeter will show constantly higher readings.
(d) Resistor will get heated up and its value will change.
(1)
31. Rakshita followed the following procedure for staining the temporary mount of leaf peel on slide.
(I) to put a single drop of stain on leaf peel & wash it with water.
(II) to put a single drop of glycerin on leaf peel.
(III) cover the leaf peel with Coverslip.
(IV) observe the slide under microscope.
(a) II, IV, I, III
(c) III, II, IV, I
(b) I, II, III, IV
(d) IV, II, I, III
(1)
32. In the experiment to show that CO2 is released during respiration student should use:
(a) Dry seeds
(c) Peeled seeds
(b) Sprouted seeds
(d) Germinating seeds
(1)
33. After removing chlorophyll, when iodine test is performed on the destarched leaf, kept in sunlight for six hours.
The expected observation would be:
(a) The entire leaf turns blue
(c) The part not covered turns blue
(b) The covered part of the leaf turns blue
(d) The colour of the iodine solution remains same.
(1)
34. When drops of blue litmus solutions are added to dil. HCl and aqueous NaOH taken in two different test tubes P
and Q respectively, what will be the colour changes occurring?
(a) Blue to red in both P & Q
(c) Blue to red in P & no change in Q
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(b) No change in both P & Q
(d) Blue to red in Q & no change in P
(1)
35. The colour of the coating develops on the zinc rod on dipping in the aqueous copper sulphate solution will be:
(a) Blue
Brown
(c) White
(d) Green.
(1)
36. For the circuits shown in figure I and II, the voltmeter reading would be:
(a) 0 V in circuit 1 & 2 V in circuit II
(c) 0 V in both
(b) 2 V in circuit 1 & 0 V in circuit II
(d) 2 V in both
(1)
37. Nuclei can be clearly seen in a well prepared slide of epidermal peel of a leaf in the:
(a) Guard Cells Only
(c) Epidermal cells only
(b) Stomata, guard cells & epidermal cells.
(d) Guard Cells & epidermal cells.
(1)
38. Which one is not observed when aluminium is added to a solution of copper sulphate?
(a) The solution is blue in t Which one is not he beginning
(b) The final solution becomes colourless
(c) The final solution becomes light green
(d) A brown mass is deposited on the surface of aluminium
(1)
39. The resistors R1 and R2 are connected in:
(a) Parallel in both circuits
(c) Parallel in circuit I and in series in circuit II
(b) Series in both circuits
(d) Series in circuit I and in parallel in circuit II
(1)
40. Seeds that are taken in the flask during respiration experiment must be :
(a) Just wet
(c) Boiled
(b) Dry
(d) Germinating.
(1)
41. An ammeter can measure current upto 500 mA. There are 20equal division between 0 and 100 mA marks on its
scale. During an experiment to determine the equivalent resistance of the tow resistors joined in parallel a
student observes ammeter’s pointer at 3rd graduation mark after zero when the key is off and the pointer at the
17th graduation mark after 200 mA when the key is inserted into the plug. The correct value of the current
flowing in the circuit is:
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(a)
(b)
(c)
(d)
13
214 mA
217 mA
270 mA
285 mA.
(1)
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Sample Question Paper-4
Section—A
1. State the main function of abscisic acid in plants.
(1)
2. Give an example of an exothermic reaction.
(1)
3. Define the SI unit of resistance?
(1)
4. Write two ways of harnessing energy from ocean.
(1)
5. A small amount of ferrous sulphate is heated in a hard glass test tube?
(2)
6. Two green plants are kept separately in oxygen free containers, one in the dark and the other in
continuous light. Which one will live longer? Give reasons.
(2)
7. A lamp rated 40 W and an electric iron rated 800 W are used for 6 hrs everyday. Calculate the total
energy consumed in 30 days.
(2)
8. Explain the significance of peristatic movement that occur all along the gut during digestion.
(2)
9. Stomata of desert plants remain closed during daytime. How do they take up carbon dioxide and
perform photosynthesis.
(2)
10. Write the equations for the following metals which are obtained from their compounds by reduction
process.
(a) Metal X which is low in reactivity series.
(b) Metal Y which is in middle of series.
(2)
11. Equal lengths of Magnesium ribbons are taken in test tubes A and B. Hydrochloric acid is added to test
tube A while acetic acid is added to test tube B. Amount and concentration taken for both the acids are
same. In which test tube will the fizzing occur more vigorously and why?
(2)
12. Differentiate overloading and short circuiting.
(2)
13. Name any two digestive enzymes secreted in the human digestive system & write their functions.
(2)
14. What happens at the synapse between two neurons?
(3)
15.
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In the above circuit diagram calculates:
(a) The value of current through each resistor
(b) The total current in the circuit
(c) The total effective resistance of circuit.
(3)
16. Describe an activity to show that rusting of iron requires air & water.
(3)
17. Give three differences between displacement and double displacement reaction.
(3)
18. What are the final products produced after digestion of carbohydrates, protein and fats?
(3)
19. If you are happened to touch a hot object, what would be your response? How will it happen? Show it
with the help of diagram?
(3)
20. Explain why(a) Colour of copper sulphate crystals changes on heating?
(b) Baking soda acts as an antacid?
(c) An acid should be added to water while diluting?
(3)
21. Write four characteristics of good source of energy. Explain how burning of fossil fuels cause acid rain.
(3)
22. The rating of an electric heater is 1100 W; 220 V. Calculate its resistance when it operates at 220 V.
Also calculate the energy consumed in KWh in the month of November if the heater is used daily for
four hours at the rated voltage.
(3)
23. In what forms are metal found in nature? With the help of examples explain how metals react with
oxygen, water and dilute acids. Also write chemical equations for the reaction.
(5)
24. Draw the diagram of alimentary canal of man & label the following parts:
(a) Mouth
(b) Oesophagus
(c) Stomach
(d) Intestine
(5)
25. (a) Describe the steps associated with extraction of copper from its sulphide ore.
(b) How impure copper is purified by electrolytic refining.
(5)
Section—B
26. In the experiment shown in the figure, water is found to rise in the bent tube:
The reason is that:
(a) Seeds use up oxygen in the flask
(b) Carbon dioxide is given out by germinating seeds
(c) Germinating seeds attract water from the beaker
figure
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(d) Seeds use oxygen and release CO2 which is absorbed by potassium hydroxide due to which a partial
vacuum is created
(1)
27. In an experiment to test the pH, of a given sample using pH paper, four students recorded the
following observations:
Sample
pH paper colour turned to
(I) Water
Blue
(II) Dil HCl
Red
(III) Dil NaOH
Blue
(IV) Dil Acetic acid
Orange
(a) I
(b) II
(c) III
(d) IV
(1)
28. A student adds a few drop of universal indicator to a solution of hydrochloric acid taken in a test tube.
He would observe that the solution changes from:
(a) Colourless to blue
(c) Colourless to violet
(b) Green top Red
(d) Colourless to red.
(1)
29. To study the dependence of current (I) on the potential difference (V) across a resistor R, two students
used the two set ups shown in figure A and B respectively. They kept the contact point J in four
different positions marked (A), (B), (C), (D), in the two figures
For the two students the ammeter and voltmeter readings will be maximum when the contact J is in
the position:
(i) (d) in both the set ups
(ii) (a) in both the set ups
(iii) (d) in set up I and (a) in set up II
(iv) (a) in set up I and (d) in set up II
(1)
30. A leaf is boiled in alcohol before using iodine for a starch test in order to:
(a) Dissolve starch
(c) dissolve chlorophyll
(b) Soften the leaf
(d) Make it react with iodine.
(1)
31. In the experiment to show that starch is formed during photosynthesis, the leaf is boiled in alcohol to:
(a) Observe the starch in chloroplast
(c) Remove the chlorophyll form the leaf
(b) Stain the starch grains
(d) Separate the leaf tissues.
(1)
32. For the circuit shown in figure’s I and II the ammeter readings would be
(a) 1 A in circuit I and 0 A in circuit II
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(b) 1 A in both circuits
(d) 0 A in circuits I and 1 A in circuit II
(1)
33. A student takes Zn, Cu, Fe and Al metals separately in four test tubes labeled I, II, III and IV respectively,
then adds 10 ml of freshly prepared solution of ferrous sulphate in each test tube and observes the
colour of the metal resilue in each test tube.
He would observe a black residue in which test tube?
(a) I and II
(b) I and III
(c) I and IV
(d) II and III
34. If a student while studying the dependence of current on the potential difference keeps the circuit
closed for a long time to measure the current and potential difference, Then;
(a) Ammeter’s zero error will change.
(b) Ammeter will give more reading.
(c) Voltmeter will show constantly higher readings.
(d) Resistor will get heated up and its value will change.
35. A student draws the following sketch of stomatal apparatus and
numbers the parts to label them.
The Chloroplast is denoted by:
(a) 1
(c) 3
(b) 2
(d) 4
(1)
Figure
36. When a white powder was mixed with dil. Acid, a colourless odourless gas was produced which can
turn lime water milky. The powder may be:
(a) Carbonate
(c) bi-carbonate
(b) Sulphate
(d) carbonate or bi-carbonate
(1)
37. To study the action of water on quick lime, quick lime is generally taken in the form of:
(a) Lumps
(c) Vapour
(b) Aqueous solution
(d) Molten state
(1)
38. A weel stained leaf peel mount when observed under the high power of a microcope show nuclei in:
(a) Guard cells only
(b) Epidermal cells only
(c) Guard cells & epidermal cells
(d) Guard cells, epidermal cells & stomata.
(1)
39. Correct sketch of stomata in epidermal peel of a leaf seen under the high power of a microscope is:
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(1)
40. Student added a piece of zinc metal to four different test tubes containing different solutions. In which
test tube he observed no change?
(a) CuSO4
(c) AgNO3
(b) ZnSO4
(d) FeSO4
(1)
41. A student takes some zinc granules in a test tube and adds dil. HCl to it. He would observe that the
colour of the zinc granules changes to:
(a) Brown
(c) Black
(b) Yellow
(d) White.
(1)
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Sample Question Paper-5
Section—A
1. Why are decomposition reaction called the opposite of combination reaction? Write equations for
these reactions?
(1)
2. The use of drywood as domestic fuelis not considered as good. state two reasons for it.
(1)
3. Why should solar cookers are to be covered their shine when kept for some time?
(1)
4. Name two most malleable metals.
(1)
5. Describe an activity to draw the magnetic field is produced around a current carrying conductor?
(2)
6. What is the main ore of mercury? How mercury is obtained from this ore?
(2)
7. What are the common feature of the respiratory organs in aquatic and terrestrial animals?
(2)
8. Differentiate between renewable & non-renewable sources of energy with one example for each.
(2)
9. A knife, which is used to cut a fruit, was immediately dipped into water containing drops of blue
litmus solution. If the colour of the solution is changed to red, what inference can be drawn about
the nature of the fruit and why?
(2)
10. Three 2 Ω resistors, A, B and C are connected as shown in figure.
Each of them dissipates energy and can withstand d a maximum
power of 18 W without melting. Find the maximum current that
can flow through the three resistors.
Fig.
(2)
11. Explain different ways to induce current in a coil.
(2)
12. AB ia a current carrying conductor in the plane of the paper as
r2
P
shown in Fig. What are the directions of magnetic fields
produced
T
by it at points P and Q? Given r1 > r2,
where will the strength of
Q
the magnetic field be
r2
larger.
(2)
13. (a) What is solar cell panel?
(b) Name any two materials that are used for making solar cells.
(2)
14. (a) What are the factors on which the magnetic field produced by the current carrying circular coil
depends.
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(b) What happens if the current through the coil is reversed?
(3)
15. Write the balanced equation involved. When:
(a) Chlorine is passed over dry slaked lime.
(b) Sodium bicarbonate reacts with dilute Hydrochloric acid.
(c) Sodium bicarbonate is heated.
(3)
16. A 400 W refrigerator operates for 16 hrs/day, calculate the cost to operate it for 30 days at Rs. 3.40
per kWh.
(3)
17. Explain the magnetic effects of current for Oersted’s experiment with the help of labeled diagram.
(3)
18. A tendril encircle or coils around the object in contact with it. Elaborate.
(3)
19. Explain how the human body responds when odrenalin is secreted into blood.
(3)
20. How is nuclear energy generated? State in brief the process of utilizing this energy in the production
of electricity. Mention the major hazard of nuclear power generation.
(3)
21. Aluminium wire has radius 0.25 mm and length of 75 m. If the resistance of the wire is 10Ω.
Calculate the resistivity of aluminium.
(3)
22. (a) What is the total resistance of n resistors each of resistance ‘R’ connected in :
(i) Series
(ii) Parallel.
(b) Calculate the resultant resistance of 3 resistors 3 Ω, 4 Ω and 12 Ω connected in parallel.
(3)
23. Shown in the diagrams (a), (b), (c) and (d) are the magnetic fields around different systems. Identify
them. Compare the pattern of the fields in the all the four examples. Are they similar? Why?
(5)
(5)
24. In our daily life we use two types of electric current whose current-time graphs are given below:
(a) Name the type of current in tow cases.
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(b)
(c)
(d)
(e)
Identify any one source for each type of current.
What is the frequency of current in case (b) in our country?
On the bases basis of these graphs list tow differences between the two currents.
Out of the two which one is used in transmitting electric power over long distance and why?
(5)
25. (a) Why ionic compounds are usually hard crystalline solids?
(b) Give two methods to prevent the rusting of Iron?
(c) Name the ores of the following metals (i) mercury (ii) Zinc.
(d) Explain, with the help of a diagram, how copper metal can be refined? Label the important
arrangements in the experimental set up.
(5)
Section—B
26. Which of the following will give a colourless gas that burns with pop sound, on reaction with dilute
HCl?
(a) Less than 7
(c) More than 7
(b) Remain 7
(d) pH does not change.
(1)
27. Copper turnings were added to a colourless salt solution. After 10 minutes it was observed that the
colourless solution turned to a coloured solution and shiny metal deposition appears. The colour of
the solution & that of metal would respectively be:
(a) Yellow & Zn
(c) Green and Fe
(b) Red & Sn
(d) Blue and Ag
(1)
28. When zinc reacts with dilute Hydrochloric acid:
(a) The surface of Zinc becomes brighter
(c) The metal turns into powder
(b) The surface of Zinc becomes black & dull
(d) The reaction mixture turns green.
(1)
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29. On adding a few drops of universal indicator to three
colourless solution taken separately in three test tubes
labeled P, Q, R respectively the colours developed in the
solutions are marked in the following fig..
What is the correct decreasing order of the pH. Value of
(P)
(Q)
(R)
Green
Red
Violet
these solutions,.
(a) P > Q > R
(b) Q > P > R
(c) R > Q > P
(d) R > P > Q
(1)
30. Which physical quantity remains unchanged in parallel combination
(a) Voltage
(b) Current
(c) Resistance
(d)none of these
(1)
31. Under the high power objective of a microscope, an epidermal peel of a leaf shows:
(a) Stoma surrounded by many guard cells.
(b) Stoma surrounded by a pair of guard cells each.
(c) Stoma surrounded by several epidermal cells
(d) Only epidermal cells
(1)
32. On putting a drop of a liquid on a pH paper a student observes a small circular patch of blue colour on
the pH paper. The liquid is most probably.
(a) H2O
(b) DCl
(c) NaOH
(d) H2SO4
(1)
33. A strip of copper was placed in a beaker containing zinc sulphate solution on observing the strip the next
day, it was notices that:
(a) The copper strip remained as it was
(b) The copper strip became thicken
(c) The copper strip became thinner
(d) The colour of strip changed.
(1)
34. 10 ml of freshly prepared iron sulphate was taken in each of four test tubes. Strips of copper, iron, zinc &
aluminium were introduced each metal in a different test tube. A black residue was obtained in two of
them. The right pair of metals forming the precipitates is:
(a) Copper & zinc
(c) Iron and aluminium
(b) Aluminium and copper
(d) Zinc and aluminium.
(1)
35. A portion of destarched leaf of a potted plant was covered with a black strip of paper. It was observed
that:
(a) Both covered and uncovered parts turned blue black.
(b) Both covered and uncovered parts turned brownish yellow.
(c) Only the uncovered part turned blue black.
(d) Only the covered part turned blue black.
(1)
36. Reddish brown deposit obtained on iron nails when kept in a solution of CuSO4 in water is that of :
(a) Cu2O
(b) CuO
(c) Cu
(d) CuS
(1)
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37. To prepare a temporary mount of a leaf peel for observing stomatas the chemicals used for staining and
mounting respectively are:
(a) Safranine & iodine
(b) Safranine & glycerine
(c) Iodine & safranine
(d) Glycerine & iodine
(1)
38. During the experiment to show that plants do photosynthesis, the destarched leaf is boiled in alcohol.
Once boiling is completed:
(a) Alcohol remains colourless
(b) Leaf remains greenish
(c) Alcohol turns greenish & leaf becomes colourless
(d) NO visible change occurs.
(1)
39. In the following setup a Hydrilla plant is kept in water.
In the sunlight, some bubbles are coming out. These
bubbles come from:
(a) Stomata
(b) Guard Cell
(c) Chloroplast
(d) None of these
(1)
Fig
40. Leaves are destarched by keeping the plant in:
(a) Dark room for 03 hours
(b) Dark room for 03 days
(c) Light for 03 hours
(d) Light for 03 days.
(1)
41. You are given four resistors. If the resistance is to be increased then the resistors are to be connected in:
(a) Series
(c) Parallel
(b) Mixed arrangement
(d) Hydrochloric acid.
(1)
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Sample Question Paper-6
Section—A
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.
13.
14.
15.
16.
17.
18.
19.
20.
21.
22.
23.
24.
24
Name the plant hormone responsible for the promotion of cell division.
(1)
Write a mathematical expression for Juole’s law of heating. Name one device which works on this principle.
(1)
What is the minimum resistance which can be made using five resistors each of which is of 1/5 Ω ?
(1)
Name one metal which react with very dilute HNO3 to evolve Hydrogen gas.
(1)
How can four resistors of resistance 4 Ω, 8 Ω, 12 Ω and 24 Ω connected to get maximum and minimum resistance
from the arrangement?
(2)
What is the colour of FeSO4. 7H2O crystals? How does this colour change upon heating? Give balanced chemical
equation for the changes.
(2)
Aluminium occurs in combined state whereas gold is found free state. Why?
(2)
An aluminium can is used to store ferrous sulphate solution. It is observed that in few days holes appeared in the can.
Explain the observation and write chemical equation to support your answer.
(2)
What is the (a) highest (b) lowest resistance that can be secured by combining four coils of resistance 4 Ω, 8 Ω, 12 Ω
and 24 Ω.
(2)
Why do we store silver chloride in dark coloured bottles?
(2)
How has the traditional use of wind & water energy been modified for our convenience?
(2)
State the role of brain in reflex action.
(2)
A magnetic compass shows a deflection when placed near a current carrying wire. How will the deflection of the
compass get affected if the current in the wire is increased? Support your answer with a reason.
(2)
(a) What is geothermal energy?
(b) What are the advantages of wind energy?
(3)
(a) Define ‘water of crystallization’.
(b) Give two examples of substances having water of crystallization. Write their molecular formulae also.
(3)
Find out the following in the electric circuit given in Fig.
(a) Potential difference across 4 Ω resistance
(b) Power dissipated in 4 Ω resistor
(c) Difference in ammeter readings, if any
(3)
fig
How does the strength of the magnetic field at the centre of a circular coil of a wire depend on:
(a) Radius of the coil (b) Number of turns of wire in the coil
(3)
Suggest two materials that can be used to produce biogas. Mention two uses of biogas and two advantages of biogas
plant.
(3)
State in brief the process of harnessing kinetic energy of the wind to do work. Mention any four limitations of
harnessing wind energy on a large scale.
(3)
Tooth enamel is one of the hardest substances in our body. How does it undergo damage due to the eating of
chocolates & sweets? What should we do to prevent it?
(3)
(a) What is thermite reaction? How it is used in joining railway tracks & cracked parts of machines.
(b) How do we get stainless steel?
(3)
(a) How does construction of dams across the river get linked with production of green house gas.
(b) How do technological inputs improve the efficiency of biomass fuels.
(3)
Describe an experiment to prove that CO2 is necessary for photosynthesis.
(5)
(a) All ores are minerals but all minerals are not ores. Justify the statement.
(b) What is Gavanisation?
(c)Give composition of brass and bronze
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(d)Explain roasting with the help of a reaction.
(e) What do you mean by amalgam?
(5)
25. (a) Draw a schematic diagram of the common domestic circuit.
(b) Write difference between overloading and shortcircuiting?
(c) What is the SI unit of magnetic field?
(5)
Section-B
26. A fruit juice is tested for its pH value. What could be its possible pH if the colour is changed to red?
(a) Less than 3
(b) More than 7.5 (c) 7
(d) Between 6.5 & 7.5
(1)
27. Four drops of red litmus solutions were added to each one of the following examples. Which one turns red litmus
solution blue:
(a) Alcohol
(b) Distilled water
(b) Sodium Hydroxide solution
(d) Hydrochloric acid.
(1)
28. Four students (a), (b), (c) and (d) measured the pH values of water, lemon juice & sodium bicarbonate solution. The
student who has expressed his results in the correct decreasing order of pH value is:
(a) Water > lemon juice > sodium bicarbonate
(b) Water > sodium bicarbonate > lemon juice
(b) Lemon juice > water > sodium carbonate
(d) Sodium bicarbonate > water > lemon juice
(1)
29. A student takes some zinc granules in a test tube & adds dil. HCl to it. He would observe that the colour of the zinc
granules changes to:
(a) Brown
(b) Black
(d) Yellow
(d) White
(1)
30. Iron filings were added to an aqueous solution of copper sulphate. After sometime on observation it was found that
the colour of the solution has changed from:
(a) Blue to pale green
(b) Blue to dark green
(b) Blue to colourless
(d) Blue to reddish brown.
(1)
31. The current flowing through a resistor connected in an electrical circuit and potential difference developed are shown
in the diagram:
The value of resistance of resistor is:
(a) 25 ohm
(c) 20 ohm
(b) 15 ohm
(d) 10 ohm
(1)
32. A light green solution of ferrous sulphate was taken in four separate test tubes marked I, II III and IV. Strips of Cu,
Fe, Zn and Al were placed in these solutions respectively. In which two test tubes a black mass will be deposited on
the surface of the metal & the green colour will fade.
(a) Test tubes I and II
(c) Test tubes II and III
(b) Test tubes III and IV
(d) Test tubes I and IV
(1)
33. Which of the following chemical properties are shown by dilute Hydrochloric acid?
(i) It turns blue litmus red
(ii) It turns red litmus blue
(iii) It reacts with Zinc and a gas is evolved
(iv) It reacts with solid sodium carbonate to give brisk effervescence.
(a) I and II only
(c) I and III only
(b) I, III and IV only
(d) II, III and IV only.
(1)
34. Leaf is decolourised by boiling in:
(a) Water
(b) Alcohol
(c) Glycerine
(d) Potassium hydroxide solution.
(1)
35. A sample of soil is mixed with water & allowed to settle. The clear supernatant solution turns the pH paper yellowishorange. Which of the following would change the colour of this pH paper to greenish-blue?
(a) Lemon juice
(c) Common salt
(b) Vinegar
(d) An antacid
(1)
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36. Given below is a sketch of a leaf partially covered with black paper & which is to be used in the experiment to show
that light is necessary for the process of photosynthesis. At the end of the experiment which one of the leaf parts
labeled I, II and III will become blue black when dipped in iodine solution.
(a) I only
(b) II only
(c) I and III
(d) II and III
(1)
37. In a sample of distilled water a pinch of solid sodium carbonate is dissolved in it. The pH will be:
(a) Less than 7
(c) More than 7
(b) Exactly 7
(d) Very near to 7
(1)
38. The voltmeter, ammeter & the tow resistors in the circuit have been checked and found correct. On inserting the key
in the plug the voltmeter reads 3.0V but the ammeter reads 150 mA. This could most likely be because the connecting
wires joined to the:
(a) Ammeter are loose
(b) 15 Ω resistor are loose
(c) 20 Ω resistor are loose
(d) Voltmeters are loose.
(1)
39. An ammeter can measure current upto 500 mA. There are 20 equal divisions between 0 and 100 mA marks on its
scale. During an experiment to determine the equivalent resistance of the two resistors joined in parallel a student
observes ammeter’s pointer at 3rd graduation mark after zero when the key is off & the pointer at the 17th graduation
mark after 200 mA when the key is inserted into the plug. The correct value of the current flowing in the circuit is:
(a) 214 mA
(b) 217 mA
(c) 270 mA
(d) 285 mA.
(1)
40. The resistance of an alloy:
(a) Increases with temperature
(c) Is constant with rise in temperature
(b) Decreases with temperature
(d) Is zero
(1)
41. A student sets up the apparatus for the experiment to show that CO2 is released during respiration. After two hours he
would observe:
(a) KOH turning milky
(c) Water level decreasing in the bent tube.
(b) Water level rising in the bent tube in the beaker
(d) No change in water level in the bet tube.
(1)
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Sample Question Paper-7
Section—A
1. What do we call the movement of shoot towards light?
(1)
2. Name the instrument used to measure electric current in a circuit?
(1)
3. The voltage –current (V-I) graph of a metallic circuit at two different temperatures T1 and T2 is shown, which of the
two temperature is higher and why?
(1)
4.
5.
6.
7.
Why is it advised not to use copper or brass vessels to brass to store pickles or curd?
What are the disadvantages of series arrangement for household circuit?
Write any two advantages of using Biogas.
Define oxidation & reduction. In the reaction
MnO2 + 4HCl → MnCl2 + 2H2O + Cl2
Identify which one is reduced and which one is oxidized?
8. Copper wire has resistance R. If the wire is doubled on it find the new resistance in terms of original resistance?
9. Why and how does water enter continuously into the root xylem?
10. What is solenoid? Draw the pattern of magnetic field lines of a solenoid through which a steady current flows.
(1)
(2)
(2)
(2)
(2)
(2)
(2)
11. (a) What will happen to the guard cells & stomatal pore when water flows to guard cells?
(b) How do plants transit information from cell to cell?
(2)
12. Differentiate between roasting & calcinations process giving an example of each.
(2)
13. A coil of insulated wire is connected to a galvanometer. What would be seen if a bar magnet with its south pole
towards one face of the coil is:
(a) Moved quickly toward it?
(c) Moved quickly away from it?
(b) Placed near its one face?
(d) Name the phenomenon involved?
(2)
14. A, B and C are three elements which undergo chemical reactions according to the following equations:
A2O3 + 2B → B2O3 + 2A
3CSO4 + 2B → B2(SO4)3 + 3C
3CO + 2A → A2O3 + 3C
Answer the following questions with reasons:
(a) Which element is the most reactive?
(c) Which element is the least reactive?
(b) What is the type of reactions listed above?
(3)
15. Explain how the human body responds when odrenalin is secreted into blood.
(3)
16. A gas is produced when conc. H2SO4 is added to solid sodium chloride taken in a test tube The gas coming out
through the delivery tube is passed over a dry blue litmus paper and then over a moist blue litmus paper. Record your
observations & explain reason with the help of chemical equation.
(3)
17. (a) What will you observe when dilute hydrochloric acid is added to a small amount of copper oxide in a beaker?
(b) Aqueous solution of HCl show acidic character. But ht aqueous solutions of glucose fail to do so. Why?
(c) Why curd and sour substances not to be kept in brass and copper vessels?
(3)
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18. State Ohm’s law? How can it be verified experimentally? Does it hold good under all conditions? Comment.
(3)
19. Find out the following in the electric circuit given in fig.
(a) Effective resistance of two 8 Ω resistors in the combination
(b) Current flowing through 4 Ω resistor.
(c) Potential difference across 4 Ω resistor.
(d) Power dissipated in 4 Ω resistor.
(e) Difference in ammeter readings, if any.
(3)
Fig
20. Name the hormone secreted by thyroid gland. Write its functions. Why is it important for us to have iodised salt in our
diet?
(3)
21. Table gives the resistivity of three samples (in Ω m)
22.
23.
24.
25.
26.
27.
28
(a) Samples
A
B
C
-8
17
Resistivity
1.6  10
7.5  10
44  10-6
Which of them is a good conductor? And which is an insulator? And why?
(b) A resistance wire (4 Ω resistance) is doubled. Calculate the new resistance of the wire.
(3)
(a) Name the main ore of mercury. How mercury is obtained from its ore. Give balanced chemical equations.
(b) What is thermite reaction? How it is used to join the railway tracks or cracked machine parts.
(c) Name the method used to extract metals of high reactivity.
(3)
(a) Balance the chemical equation
Fe(s) + H2O(g) → Fe3O4(s) + H2(g)
(b) Identify the type of reaction in the equation given below:
Na2SO4 (aq) + BaCl2 (aq) → BaSO4 (s) + NaCl (aq)
(c) You could have noted that when copper powder is heated in a China dish, the surface of copper powder becomes
coated with black colour substance.
(i) Why has this black coloured substance formed?
(ii) What is that black substance?
(iii) Write the chemical equation of the reaction take place.
(5)
(a) Draw a sectional view of the human heart and label:
(i) Pulmonary artery
(ii) Aorta
(iii) Septum
(iv) Ventricles
(b) Arteries have thick elastic walls while veins have valves, explain.
(5)
(a) Why are the valves needed in the heart?
(b) Leakage of blood from vessels reduces the efficiency of pumping system. How is the leakage prevented?
(c)Why do aquatic animals breathe faster than terrestrial animals.
(d) How are lungs designed in human beings to maximize the area for exchange of gases?
(e) Why do walls of the trachea not collapse when there is less air in it?
(5)
Section-B
The figure depicts one of the steps of the experiment. What does labeling denote:
(a) Starch solution
(b) Alcohol
(c) Water
(d) Benzene
(1)
When a powder was treated with dil. HCl, a gas was produced and when a lighted match stick is shown to it, the flame
was put off & the gas also didn’t start burning. The powder may be:
(a) ZnSO4
(c) CuSO4
(b) Na2CO3
(d) Na2SO4
(1)
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28. The given circuit diagram shows the experiment arrangement of different circuit components for determination of
equivalent resistance of two resistors connected in series. The component X, Y and Z shown in the circuit respectively
represent:
(a) Rheostat, Resistor, Ammeter
(b) Voltmeter, Ammeter, Rheostat
(c) Ammeter, Voltmeter, Rheostat
(d) Rheostat, Ammeter Voltmeter
(1)
29. Four students (a), (b), (c) and (d) measured the pH values of water, lemon juice and sodium bicarbonate solution,
what is the correct decreasing order of pH values?
(a) Water > lemon juice > sodium bicarbonate
(c) Water > sodium bicarbonate > lemon juice
(b) Lemon juice > water > sodium bicarbonate
(d) Sodium bicarbonate > water > lemon juice
(1)
30. Given below are certain chemical properties of substances:
(I) It turns blue litmus red.
(II) It reacts with Zinc and a gas evolves
(III) It turns red litmus blue
(IV) It reacts with solid sodium carbonate to give brisk effervescence.
Which out of these properties are shown by dilute hydrochloric acid?
(a) I and II only
(c) I and III only
(b) I, III and IV only
(d) II, III and IV only
(1)
31. Which is the correct figure representing Ohm’s Law?
(a) (i) only
(b) (i) and (ii)
(c) (ii) only
(d) (ii) and (iii)
(1)
32. A student tested pH of distilled water with a pH paper and observe green colour. After adding a few drops of dilute
NaOH solution, the pH was tested again. The colour change observed would be:
(a) Blue
(b) green
(c) red
(d) Orange
(1)
33. Which one of the following is the combination of the relevant materials required for setting up an experiment to show
that light is necessary for photosynthesis.
(a) Destarched leaves, strips of black paper, starch solution and iodine crystal
(b) A potted plant strips of coloured paper, starch solution, iodine and potassium iodide.
(c) Destarched potted plant, strips of black paper, starch solution, potassium iodide.
(d) Destarched potted plant, strips of black paper and iodine solution.
(1)
34. In the following experiment set up to show that CO2 is evolved during respiration substances A and B are:
(a) A is water and B is limewater
(b) A is lime water and B is water
(c) A is KOH pellets and B is lime water
(d) A is KOH solution and B is water
(1)
35. A drop of a solution ‘X’ is placed on a strip of pH paper. A deep red colour is produced. The solution ‘X’ is:
(a) NaOH
(b) HCl
(c) Water
(d) CH3COOH
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SARASWATI STUDY POINT
36. To determine equivalent resistance on two resistors when connected in series, a student arranged the circuit
components as shown in the diagram. He did not succeed in achieving his objective.
Which of the following mistakes has been committed by him?
(a) Position of voltmeter is incorrect.
(b) Position of ammeter is incorrect
(c) Terminals of voltmeter are wrongly connected
(d) Terminals of ammeter are wrongly connected
(1)
37. AN ammeter can measure current upto 500 mA. There are 20 equal Division between 0 and 100 mA marks on its
scale. During an experiment to determine the equivalent resistance of the two resistors joined in parallel a student
observes ammeter’s pointer at 3rd graduation mark after zero when the key is off and the pointer at the 17th graduation
mark after 200 mA when the key is inserted into the plug. The correct value of the current flowing in the circuit is:
(a) 214 mA
(b) 217 mA
(c) 270 mA
(d) 285 mA.
(1)
38. In an experiment to test the pH, of a given sample using pH paper, four students recorded the following observations:
Sample taken
pH paper colour turned to
(i) Water
Blue
(ii) Dil HCl
Red
(iii) Dil NaOH
Blue
(iv) Dil acetic acid
Orange
(a) I
(c) III
(b) II
(d) IV
(1)
39. In the circuit given below the voltmeter and ammeter readings are respectively:
(a) 2 V and 2 A
(b) 1 V and 2 A
(c) 2 V and 1 A
(d) 1 V and 1 A
(1)
40. The readings of current flowing through a conductor and the potential difference across its two ends are shown in the
ammeter and voltmeter given below. The resistance of the conductor would be:
(a) 20 Ω
(b) 2.0 Ω
(c) 5.0 Ω
(d) 0.2 Ω
41. Four safety symbols are given below. The most appropriate one foe sulphur dioxide gas is:
(a) c
30
(b) d
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Sample Question Paper-8
Section—A
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.
13.
14.
15.
16.
17.
18.
19.
20.
21.
22.
31
Which hormone is injected to a diabetic patient and why?
(1)
Why do we use copper and aluminium wire for transmission of electric current?
(1)
Construction of dams submerges large areas of forests, how does this contribute to the green house effect?
(1)
What are the tow disadvantages of burning fossil fuels?
(1)
What are the end products formed during fermentation in yeast. Under what condition a similar process takes place in
our body that leads to muscle cramps?
(2)
A substance ‘X’ is used for white washing
(a) Name X and write its formula
(b) Write reaction of substance X with water
(2)
What would you observe when zinc is added to a solution of iron (II) sulphate. Name the type of reaction and write
chemical equation.
(2)
Name 2 salts that are used in black & white photography. Give reactions when they are exposed to light.
(2)
How do guard cells regulate opening and closing of stomatal pores?
(2)
Identify the substance that is used to cut a fruit, was immediately dipped into water containing drops of blue litmus
solution. If the colour of the solution is changed to red, what inference can be drawn about the nature of the fruit and
why?
(2)
What is the role of saliva in the digestion of food?
(2)
Out of solar cookers one was covered by a plane glass slab & other was left open which of the two solar cookers will
be more efficient and why?
(2)
A metal is treated with dil. H2SO4 the gas evolved is collected by the method thrown in the figure. Answer the
following:
(i) name the gas
(ii) Name the method of collection of the gas
(iii) Is the gas soluble or insoluble in water?
(iv) Is the gas liter or heavier than air?
(2)
When a 12 V battery is connected across an unknown resistor, 2.5 mA current flows in the circuit? Find the resistance
of the resistor?
(2)
What is magnetic field? Gie two properties of magnetic field lines.
(2)
Why is it not possible to make use of solar cells to meet all our energy needs? State at least three reasons to support
your answers.
(3)
(a) If the cerebellum is not functioning properly, what are the activities of our body affected?
(b) How do muscle cells move?
(3)
-6
2
-2
A copper wire of length 3 m and the area of cross section 1.7  10 m has a resistance of 3  10 ohms. Calculate the
resistivity of copper.
(3)
Why does the shoot of the plant bend towards light when it is kept inside cardboard box with a small hole?
(3)
(a) What are redox reactions?
(b) Why the reaction between manganese dioxide and Hydrochloric acid is redox reaction?
(c) Identify the substance oxidized and the substance reduced in the above reaction.
(3)
What are the different ways in which glucose is oxidized to provide energy in various organisms?
(3)
Two conducting wires of same material, equal length and equal diameter are first connected in series. How does the
heat produced by the combination of resistance change.
(3)
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23. (a) Write the electron dot structure for sodium, oxygen and magnesium and chlorine.
(b) Show the formation of sodium oxide and magnesium oxide by ht transfer of electrons.
(c) Name the ions present in these compounds.
(5)
24. Four metals A, B, C and D are in turn added to the following solutions one by one. The observations made are
tabulated below
Iron (II)
Copper (II)
Zinc
Metal
Silvernitrate
Sulphate
Sulphate
Sulphate
A
No. reaction
Displacement
--B
Displacement
-No reaction
-C
No reaction
No reaction
No reaction
Displacement
D
No reaction
No reaction
No reaction
No reaction
Answer the following questions based on the above information:
(a) Which is the most active metal and why?
(b) What would be observed if B is added to a solution of copper sulphate and why?
(c) Arrange the metals A, B, C and D in order of increasing reactivity.
(5)
(d) Container of which metal can be used to easily store in a container made up of any of these metals.
25. (a) Draw the human excretory system and label
(i) Left kidney
(ii) Ureter
(iii) Urinary bladder
(iv) Vena cava.
(b) What is the main toxic waste kidney filters from the blood?
(c) Name any two substances which are selectively reabsorbed from the tubules of a nephron.
(5)
Section-B
26. Bottle A contains a dilute solution of vinegar and bottle B contains sodium carbonate solution the colour seen in pH
paper dipped in A and B are:
(a) Orange, blue
(c) Green, blue
(b) Blue, Orange
(d) Orange, green
(1)
27. For the circuits a and b shown below the voltmeter readings would be:
(a) 0.6 V in circuit A and 2.5 V in circuit B
(c) 0 V in both circuits
(b) 3 V in both circuits
(d) 0 V in circuit A and 3 V in circuit B
(1)
28. In the experiment on finding the equivalent resistance of two resistors of 15 Ω and 20 Ω joined in parallel three circuit
diagrams X, Y & Z are available.
For getting correct results you would choose:
(a) Only X
(b) Only Z
(c) Only Y
(d) Any one of the three
(1)
29. Which two circuit components are connected in parallel in the following circuit diagram?
(a) Rheostat and voltmeter
(b) Voltmeter and resistorxz
(c) Voltmeter and ammeter
(d) Ammeter and resistor
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30. Four groups of students were assigned separately the experiment of interaction of iron nail with a solution of copper
sulphate. Each group recorded the observations as given below in the table. Which group of students recorded all the
observations correctly?
(1)
Group of
Initial colour of
Final Colour of
Change in the
Students
solution
solution
Iron nail
(A)
Blue
Colourless
Grey coat
(B)
Green
Green
Brown coat
(C)
Blue
Blue
Brown coat
(D)
Blue
Light green
Brown coat
31. The Experiment on finding the equivalent resistance of two resistors, connected in parallel, three students connected
the voltmeter in their circuits, in three ways X, Y and Z shown here
The voltmeter has been correctly connected in:
(a) Cases X and Y only
(c) Cases Y and Z only
(b) Cases Z and X only
(d) All the three cases
(1)
32. Four resistors are connected in Parallel.
Each has a resistance 2 Ω. The
effective resistance is:
(a) 8 Ω
(b) 4 Ω
(c) 0.5 Ω
(d) 0.25 Ω
(1)
33. In the following experimental set up to show CO2 is given out during respiration the substances taken in the test tube
and in beaker can be:
(a) KOH pellets and water respectively
(b) Water and KOH pellets respectively
(c) KOH pellets and lime water respectively
(d) Lime water and KOH pellets respectively
(1)
34. In an electric circuit, three resistors R1, R2 ad R3 are connected in series such that R2 = R3. If V1, V2 and V3 are the
voltages across R1, R2 and R3 respectively, then:
(a) V1 = V2
(c) V2 = V2
(b) V1 + V3
(d) V1 = V2 = V3
(1)
35. In the experiment “To show that CO2 is given out during respiration” the water level in the bent tube rise after
sometime because:
(a) The germinating seeds consume all the O2 and CO2 in the flask.
(b) The germinating seeds consume O2 and give out CO2 which is absorbed by a chemical filled in the small test tube.
(c) CO2 is given out by the germinating seeds.
(d) Seeds need water for germination and grow.
(1)
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36. Out of the four circuits shown for studying the dependence of the current on the potential difference across a resistor,
the correct circuit is:
(i) a
(ii) b
(iii) c
(iv) d
37. Given Below are four different set ups to show that CO2 is released during respiration:
(1)
A=
The set up that will give the desire result is:
(i) A
(ii) b
(iii) c
(iv) d
(1)
38. In the experiment “To show that CO2 is given out during respiration” the water level in the bent tube rise after
sometime because:
(a) The germinating seeds consume all the O2 and CO2 in the flask.
(b) The germinating seeds consume O2 and give out CO2 which is absorbed by a chemical filled in the small test tube.
(c) CO2 is given out by the germinating seeds.
(d) Seeds need water for germination and grow.
(1)
39. In an experiment on photosynthesis, a student fixed a strip of black paper on the dorsal surface of a leaf in the
morning, in the evening she tested the leaf for starch. The result was:
(a) The dorsal surface of the leaf was white but the ventral surface turned blue.
(b) Both the surface of the leaf was white
(c) The entire leaf turned blue black
(d) The entire leaf remained white.
(1)
40. The positive and negative terminal markings are missing on a give battery eleminator. The correct terminal markings
can best be identified by the arrangement shown in:
(a) Fig a
(b) Fig b and c
(c) Fig a and b
41. In the circuits I and II shown below the resistors R1 and R2 are connected in:
(a)
(b)
(c)
(d)
34
(d) Fig c and a
Parallel in both circuits
Series in both circuits
Series in circuit I and series in circuit II
Series in circuit I and parallel in circuit II
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Sample Question Paper-9
Section—A
1. Write a balanced chemical equation to represent the following reaction:
Carbon monoxide reacts with hydrogen gas at 340 atm. to form methyl alcohol.
(1)
2. Why do silver ornaments loose their shine when kept for sometimes?
(1)
3. Name the main constituents of Biogas.
(1)
4. A non-metal X exists in two different forms Y and Z. Y is hardest natural substance, whereas Z is a good conductor of
electricity. Identify X, Y and Z.
(1)
5. HCl and HNO3 show acidic characters in aqueous solution while Alcohol and Glucose solutions do not. Give
reasons.
(2)
6. Explain the parasitic mode of nutrition with two examples.
(2)
7. Two electric bulbs A and B are marked 220 V, 40 W and 220 V, 60 W respectively. Which one of the tow has greater
resistance?
(2)
8. State the factors on which the resistance of a cylindrical conductor depends. How will resistance of a conductor
change if it stretched so that its length is doubled?
(2)
9. How are the fats digested in our body where does where does this process take place?
(2)
10. Write balanced equations for the reaction of :
(a) Iron with team
(b) Calcium with water
(2)
11. When a sportsman runs, he gets muscle cramps. Why?
(2)
12. Write the balanced chemical equitation of the following reaction and write the name of the reaction:
Barium chloride + Aluminium sulphate  Barium sulphate + Aluminium chloride
(2)
13. An electric device operates at 24 V and has a resistance of 8 Ω. Calculate the power consumed by the device and
current flowing through it.
(2)
14. Why the medium becomes acidic in mouth? What is the ill effect of the acidic medium? How this can be
prevented?
(3)
15. Two conducting wires of same material, equal length and equal diameter are first connected in series. How does the
heat produced by the combination of resistance change.
(3)
16. Name two safety measures commonly used in electric circuits and appliances, what precautions should be taken to
avoid the overloading of domestic electric circuits.
(3)
17. What is tropism? Design an experiment to demonstrate hydrotropism with the help of diagram.
(3)
18. What is the function of receptors in human body? What are the types of receptors found in humans? What
problems are likely to occur if receptors do not work properly?
(3)
19. You are given two solution A and B. The pH of solution A is 6 and pH of solution is 8.
(i) Which solution is acidic and which is basic?
(ii) Which solution has more H+ ion concentration?
(iii) Why is HCl a stronger acid than acetic acid?
(3)
20. List the names of hormones secreted by the following endocrine glands & mention their functions:
(i) Thyroid gland
(ii) Pituitary gland
(iii) Adrenal gland.
(3)
21. What are the factors on which magnetic field produced by a current carrying straight conductor depend. State the
rule which gives the direction of magnetic field.
(3)
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22. Leaves of a healthy potted plant were coated with Vaseline. Will this plant remain healthy for long? Give reasons for
your answer.
(3)
23. (i) Draw the diagram of human respiratory system and label the following parts
(a) Pharynx
(b) Diaphragm (c) trachea
(d) Rings of cartilage
(ii) Why do aquatic animals breathe faster than terrestrial animals?
(iii) How are lungs designed in human beings to maximize the area for exchange of gases.
(5)
24. Leaves of a healthy potted plant were coated with Vaseline. Will this plant remain healthy for long? Give reasons for
your answer.
Four metals A, B, C and D are in turn added to the following solutions one by one. The observations made are
tabulated below
Iron (II)
Copper (II)
Zinc
Silvernitrate
Sulphate
Sulphate
Sulphate
A
No. reaction
Displacement
--B
Displacement
-No reaction
-C
No reaction
No reaction
No reaction
Displacement
D
No reaction
No reaction
No reaction
No reaction
Answer the following questions based on the above information:
(a) Which is the most active metal and why?
(b) What would be observed if B is added to a solution of copper sulphate and why?
(c) Arrange the metals A, B, C and D in order of increasing reactivity.
(d) Container of which metal can be used to easily store in a container made up of any of these metal
(e) Whih of the above solutions can be easily stored in a container made up of any of these metals.
Metal
(5)
25. In our daily life we use two types of electric current whose current-time graphs are given below:
(a)
(b)
(c)
(d)
(e)
Name the type of current in tow cases.
Identify any one source for each type of current.
What is the frequency of current in case (b) in our country?
On the bases basis of these graphs list tow differences between the two currents.
Out of the two which one is used in transmitting electric power over long distance and why?
Section-B
(5)
26. The voltmeter, ammeter and the two resistors in the circuit have been checked and found correct. On inserting the
key in the plug the voltmeter reads 3.0 V but the ammeter reads 150 mA. This could most likely be because the
connecting wires joined to the:
(a) Ammeter are loose
(b) 15 Ω resistor are loose
(c) 20 Ω resistor are loose
(d) Voltmeter are loose.
36
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27. A student preformed to starch test on a leaf. Some steps involved are shown below:
The Correct sequence of steps should be:
(a) (iv), (iii), (ii), (i)
(c) (i), (ii), (iii), (iv)
(b) (ii), (iii), (iv), (i)
(d) (i), (iii), (iv), (ii)
(1)
28. In an experiment on photosynthesis, a student fixed a strip of black paper on the dorsal surface of a leaf in the
morning, in the evening she tested the leaf for starch. The result was:
(e) The dorsal surface of the leaf was white but the ventral surface turned blue.
(f) Both the surface of the leaf was white.
(g) The entire leaf turned blue black.
(h) The entire leaf remained white.
(1)
29. The current flowing through a resistor connected in a circuit and that potential difference across its end is as shown
in the diagram. The approximate value of the resistor is:
(a) 2 Ω
(b) 6 Ω
(c) 12 Ω
(d) 15 Ω
(1)
30. Identify the circuit in which the electrical components have been properly connected:
(a) i
(b) ii
(c) iii
(d) iv
31. For the circuits a and b shown below the voltmeter readings would be:
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SARASWATI STUDY POINT
(a) 0.6 V in circuit A and 2.5 V in circuit B
(c) 3 V in both circuits
(b) 0 V in both circuit
(d) 0 V in circuit A ad 3 V in circuit B
32. In the given sketch of the stomatal apparatus the parts I, II, III, IV were labeled differently by four students:
(1)
(a) (I) guard cell, (II) stoma, (III) starch granule, (IV) nucleus
(b) (I) cytoplasm, (II) nucleus, (III) stoma, (IV) chloroplast
(c) (I) guard cell, (II) starch granule, (III) nucleus (IV) stoma
(d) (I) cytoplasm, (II) chloroplast, (III) stoma, (IV) nucleus
(1)
(fig)
33. Aqueous solutions of zinc sulphate and iron sulphate were taken in test tubes I and IIby four students P, Q, R and S.
Metal pieces of iron and zinc were dropped, in the tow solution and observation made after several hours and
recorded in the form of a table as given below.
Observation
Coulour change of
Deposit/ residue
Metal
Solution
BY
Solution
Obtained
A
Fe
ZnSO4
Turned green
Silvery grey coating
Zn
FeSO4
No change
No change
B
Fe
ZnSO4
No change
Black residue
Zn
FeSO4
Colour faded
Grey coating
C
Fe
ZnSO4
No change
No change
Zn
FeSO4
Turned colourless
Black residue
D
Fe
ZnSO4
No change
Grey residue
Zn
FeSO4
No change
Black residue
The correct reporting has been made in observation reported by the student:
(1)
(a) P
(b) Q
(c) R
(d) S
34. On adding a few drops of universal indicator to three
colourless solution taken separately in three test tubes
labeled P, Q, R respectively the colours developed in the
solutions are marked in the following fig..
What is the correct decreasing order of the pH. Value of
these solutions,.
(a) P > Q > R
(b) Q > P > R
(c) R > Q > P
(P)
(Q)
(R)
Green
Red
Violet
(d) R > P > Q
(1)
35. The following ammeters and voltmeters are available in the laboratory to find equivalent resistance of two resistors
R1 and R2 in parallel:
Ammeters:
A1 of Range 0 to 300 mA : Least count 10 mA
A2 of Range 0 to 100 mA : least count 20 mA
Voltmeters:
V1 of Range 0 to 5V: Least count 0.2 V
V2 of Range 0 to 4V: Least count 0.4 V
The best combination of voltmeter and ammeter would be
(a) Ammeter A1 and voltmeter V1
(c) Ammeter A1 and voltmeter V2
(b) Ammeter A2 ad voltmeter V1
(d) Ammeter A2 voltmeter V2
(1)
36. In an experiment to study dependence of current on the potential difference across a given resistor, four students,
four students P, Q, R and S kept the plug key in the circuit closed for time t1 and then open for time t2 as given in the
table below:
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Closed time
Open time
t1 seconds
t2 seconds
P
15
45
Q
45
15
R
60
30
S
45
30
The best choice of open and closed time is that of student:
(a) P
(b) Q
(c) R
(d) S
37. A student was asked to prepare temporary mount of stomata from a leaf. He should select:
(a) Tip of the leaf
(b) Midrib of the leaf
(c) Upper epidermis
(d) Lower epidermis
Student
(1)
(1)
38. In an experiment to test the pH, of a given sample using pH paper, four students recorded the following
observations:
Sample
pH paper colour turned to
(I) Water
Blue
(II) Dil HCl
Red
(III) Dil NaOH
Blue
(IV) Dil Acetic acid
Orange
(b) I
(b) II
(c) III
(d) IV
(1)
39. In the sketch of stomatal apparatus which of the
following is missing?
(a) Cell membrane of the cells
(b) Cell wall of the cells
(c) Nuclei of the guard cells
(d) Chloroplast in the guard cells
(1)
40. Four students performed the reactions of a di. Hydrochloric acid and a solution of sodium hydroxide with zinc metal
and solid sodium carbonate separately. They reported the possible reaction by (√) and no reaction by (x).In which of
the following set all observation are correct?
SET
HCl + Zn
HCl + Na2CO3
NaOH + ZN
NaOH + NaCO3
(A)





(B)

x
x
x
x
(C)


x



(D)
(1)
41. The rest positions of the needles in a milliammeter and voltmeter when not being used in a circuit are as shown in
the figure. The zero error and least count of these two instruments are:
(a) (+ 4 mA, - 0.2 V) and (1 mA, 0.1 V) respectively
(b) (+ 4 mA, - 0.2 V) and (2 mA, 0.2 V) respectively
(c) (- 4 mA, + 0.2 V) and (2 mA, 0.2 V) respectively
(d) (- 4 mA, + 0.2 V) and (2 mA, 0.1 V) respectively
(1)
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Sample Question Paper-10
Section—A
1.
2.
3.
4.
Which part of brain controls posture and balance of the body?
(1)
Nichrome is used to make the element of electric heater. Why?
(1)
Name the instrument used to measure electric current in a circuit?
(1)
Complete and balance the reaction:
Fe2O3 + Al 1
(1)
5. What would you observer when zinc is added to a solution of iron (II) sulphate. Name the type of reaction and write
the chemical equation.
(2)
6. Name 2 salts that are used in black & white photography. Give reactions when they are exposed to light.
(2)
7. What would be the reading of ammeter and
Voltmeter in the given circuit?
(2)
8. State Ohm’s law. “The resistance of a conductor is 1 Ω.” What is meant by this statement?
9. Give reason:
(2)
(a) Why tungsten is used for making filament of electric lamps.
(b) The elements of heating electrical appliances are made up of an alloy rather than pure metal.
(2)
10. “All plants give out oxygen during day and carbon dioxide during night.” Do you agree with this statement? Give
reason.
(2)
11. A student constructed a model of box type solar cooker. He used a transparent plastic sheet to cover the open face
the box. He found that this cooker does not function well. What could be the possible drawbacks in his model? List
any four drawbacks.
(2)
12. Take 2 g silver chloride in a China dish & place it in sunlight:
(a) Observe the colour of silver chloride after sometime.
(b) What type of reaction takes place?
(c) Write the chemical reaction for the above observation.
(2)
13. (i) What precautions should be taken to avoid the overloading of domestic electric circuits?
(ii) An electric oven of 2kw power rating is operated in a domestic electric circuit (220 V), that has a current rating
5A. That has a current rating 5A. What result do you expect? Explain
(2)
14. A piece of wire of resistance 20 Ω is drawn out so that its length is increased to twice its original length. Calculate
the resistance of the wire in the new situation.
(3)
15. Draw a schematic diagram of a circuit consisting of 24 V batter, a 10 ohm resistor, a 5 ohm resistor, a ohm resistor,
an ammeter and a plug key all connected in series. Calculate the ammeter reading in this circuit.
(3)
16. An electric device operates at 24 V and has a resistance of 8 Ω. Calculate the power consumed by the device and
current flowing through it.
(3)
17. (a) Why are electric toaster and electric iron made of an alloy rather than pure metal?
(d) An electric iron of resistance 20 Ω takes a current of 5 A. Calculate the heat developed in 30 Second.
(3)
18. What compound is plaster Paris? How is it prepared? What happens when it is mixed with water and allowed to
stand? Mention two applications of this property of Plaster of Paris.
(3)
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19. In the following schematic diagram for the preparation of hydrogen gas as shown in fig, what would happen if
following changes are made?
(a) In place of zinc granules, same amount of zinc dust is taken in the test tube.
(b) Instead of dilute sulphuric acid, dilute hydrochloric acid is taken.
(c) Sodium hydroxide is taken in place of dilute sulphuric acid and the tube is heated.
(3)
20. How does feed-back mechanism regulate the hormone secretion?
21. Diagrammatically show how a magnetic needle deflects when it is placed above or below a straight conductor
(3)
carrying current depending on the direction of the current in the conductor.
22. With the help of a diagram explain reflex are and reflex action.
23. (a) Why are the valves needed in the heart?
(b) Leakage of blood from vessels reduces the efficiency of pumping system. How is the leakage prevented?
(c) Why do aquatic animals breathe faster than terrestrial animals?
(d) How are lungs designed in human beings to maximize the area for exchange of gases?
(e) Why do walls of the trachea not collapse when there is less air in it?
(3)
(3)
24. (a) Describe the steps associated with extraction of copper from its sulphide ore.
(c) How impure copper is purified by electrolytic refining.
(5)
(5)
25. (a) Explain an activity to show that a current carrying conductor experiences a force when placed in a magnetic
Electron
field.
(b) State the rule which given the direction of force acting on the conductor.
(c) An electron moves perpendicular to a magnetic field as shown in the figure.
What would be the direction of force experienced on the electron?
Magnetic field
(5)
Section-B
26. For three circuits shown here:
The same two resistors R1 and R2 have been connected in parallel in all the circuits but the voltmeter & ammeter
have been connected in the three different positions. The relation between the three voltmeter and ammeter
readings would be:
(a) V1 = V2 = V3 and I1 = I2 = I3
(c) V1 ≠ V2 ≠ V3 and I1 = I2 = I3
(b) V1 = V2 = V3 and I1 ≠ I2 ≠ I3
(d) V1 ≠ V2 ≠ V3 and I1 ≠ I2 ≠ I3
(1)
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27. A destarched leaf on a potted plant was covered with black: (a) transparent (b) Strips of paper as shown in fig. After
6 hours of exposure to sunlight the leaf was removed from the plant and tested for starch. Which of the following
will be the correct observation?
(a) Whole leaf turned blue black.
(b) Only B portion tuned blue black.
(c) Only A & B portions remained colourless
and the rest of the leaf turned blue black.
(d) Only a portion remained colourless and
the rest of the leaf turned blue black.
(1)
28. Two students (A) and (B) connects their two given resistors R1 and R2 in the manners shown n figure:
Student A connects the terminals marked (b1)
and (c1) while student B connects the terminal
marked (d2) and (c2) in their respective circuit
at the point marked X and Y shown in fig. Which
one is correct relation in above arrangement?
(a) Both the students will determine the equivalent resistance of the series combination of the two resistors.
(b) Bothe students will determine the equivalent resistance of the parallel combination of the two resistors
(c) Student (A) will determine the equivalent resistance of the series combination while student (B) will determine
the equivalent resistance of the parallel combination of the two resistors
(d) Student (A) will determine the equivalent resistance of the parallel combination while student (B) will determine
the equivalent resistance of the series combination of the two resistors.
(1)
29. To student the dependence of current (I) on the potential difference (V) across a resistor, two students and the two
set ups shown in fig. (A) and (B) respectively. They kept the contact J in four different position marked (A), (B), (C)
and (D) in the tow fig.
For the two students their ammeter and voltmeter reading will be minimum when the contact J is in the position:
(i) (a) in both the set ups
(iii) (d) in setups (a) and (a) in set up (b)
(ii) (d) in both set ups
(iv) (a) in set up (a) and in set up (b)
(1)
30. To determine the equivalent resistance of a series combination of the two resistors R1 and R2 a student arranges
the following set up.
(a) Incorrect reading for current I as well as V
(b) Correct reading for current I but incorrect reading for V
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(c) Incorrect reading for current I but correct reading for V
(d) Correct reading for both current I and V
(1)
31. Using the same number of given germinating seeds, two students A and B set up the experiment separately. Student
A used a cotton plug to hold the bent tube in the mouth of the flask. Student B used a rubber cork:
After 4 hours they noticed that:
(a) Water level increased in the bent tube of A
(b) Water level increased in the bent tube of B
(c) The cotton plug was wet.
(d) The water in the beaker of B turned milky.
(1)
32. Two circuits: circuit I and circuit II are shown, in circuit I, ammeter reads current I1 and voltmeter reads voltage V1 in
circuit I2 and voltmeter reads voltage V2. The relationship between the readings (I1, I2 , V1 and V2)is:
(a) I1 > I2; V1 = V2
(b) I1 > I2; V1 > V2
(c) I1 < I2; V1 = V2
(d) I1 < I2; V1 < V2
(1)
33. Four students studied reactions of Zinc & Sodium carbonate with dilute hydrochloric acid and dil sodium hydroxide
solutions and presented their results as follows. The () represents evolution of gas & (x) represents absence of any
reaction.
The right set of observations is that of student:
(a)
(b) ii
(c) iii
(d) iv
(1)
34. A leaf from a destarched plant is covered with black paper strip as shown in figure 1. The starch test is done on the
leaf after 8 hours.
(a) (i)
(b) (ii)
(c) (iii)
(d) (iv)
(1)
35. When an pH paper is dipped in a solution, the colour of pH paper changes to deep red. What will be the possible pH
of the solution?
(b) 2
(b) 6
36. Coverslip is put on the slide very gently to avoid:
(c) Entry of air bubbles (b) Oozing of Glycerine
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(d) none of these
(c)Crushing of the material
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SARASWATI STUDY POINT
37. To determine the equivalent resistance of a series combination of the two resistors R1 and R2 a student arranges
the following set up.
(e) Incorrect reading for current I as well as V
(f) Correct reading for current I but incorrect reading for V
(g) Incorrect reading for current I but correct reading for V
(h) Correct reading for both current I and V
(1)
38. In an experiment on photosynthesis, students were instructed to cover a portion of a leaf of a destarched potted
plant with opaque paper as shown in the figure:
“a” covered one of the leaves with red “b” with green, “c” with blue and “d” with black. When the starch test was
done on the leaves after 4 hours. The result showed no starch in:
(a) The portion covered with red, green & blue strips (c) The portion covered with green strip
(b) The portion covered with black and blue strips.
(d) Any of the covered portion.
(1)
39. In the experiment on studying the dependence of current (I) on the potential difference (V), three students plotted
the following graphs as per their observations:
I
I
I
V
V
V
(i)
(ii)
(iii)
The observations, likely to do correct, are those of:
(a) Student I only
(c) Student III only
(b) Student II only
(d) All the three students
40. In the experiment on finding the equivalent resistance of two resistors connected in parallel three students
connected the voltmeter in their circuits in the three ways X, Y and Z shown here:
(1)
The voltmeter has been correctly connected in:
(a) Cases X and Y only
(c) Cases Y and Z only
(b) Cases Z and X only
(d) All the three cases.
(1)
41. The current following through resistor and the potential difference developed across its end are shown in fig the
value of resistance of resistors is:
(a) 0.5 ohm
(b) 5.0 ohm
(c) 50 ohm
(d) 500 ohm
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