Download Science - Chanderbala Modi Academy

CHANDERBALA MODI ACADEMY.
(Science)
Formative 1
2014-15
STD X
Question Bank
PHYSICS
1. What is the convention direction of flow of current?
(1)
2. Define the term resistivity.
(1)
3. Name what factors does the resistance of a conductor depend?
(1)
4. What does an electric circuit mean?
(1)
5. What is an electric switch?
(1)
6. Name a device that helps to maintain potential difference across a conductor?
(1)
7. What is a rheostat?
(1)
8. What is ammeter?
(1)
9. What is voltmeter?
(1)
10. Mention the condition under which charges can move in a conductor.
(1)
11. How much energy is given to each coulomb of charge passing through 6 V batteries?
(1)
12. A current of 0.5 A is drawn by a filament of an electric bulb for 10 minutes. Find the amount
of charge flowing through it.
(1)
13. Why are coils of electric toasters made of an alloy rather than pure metal?
(1)
14. Why are Cu and Al wires usually employed for electricity transmission?
(1)
15. Distinguish between open and closed electric circuit.
(1)
16. How is the voltmeter and ammeter connected in an electric circuit?
(2)
17. Draw a schematic diagram of a circuit consisting of a battery of 6 cells of 1.5V each, 3
resistors each of 3 Ω in series and a plug key.
(2)
18. State ohm’s law. Draw the graph between and V and I.
(2)
19. A wire of length L and radius R is stretched so that its length is doubled and area of cross
section is halved. How will its resistance and resistivity change?
(2)
20. Define electric current. Give its SI unit.
21. Calculate the number of electrons constituting 1 C of charge.
(2)
(2)
22. Define potential difference. Give it SI unit.
(2)
23. Define Resistance. Give it SI unit.
(2)
24. Which material is the best conductor of electricity and why?
(2)
25. Draw electric circuit to study the factors on which the resistance of a conductor depends?
(2)
26. How much current will an electric bulb draw from 220 V source if resistance of the bulb is 1200
Ω? If in place of bulb, a heater of resistance of 100 Ω is connected to the source, calculate the
current drawn by it.
(2)
27. Define the SI unit of electric current, potential difference and resistance.
(3)
28. Draw electric circuit to describe ohm’s law. Label the circuit components used to measure
current and potential difference.
(3)
29. Derive an expression for the equivalent resistance when 2 resistors are connected in series.
(3)
30. A resistor of 6 Ω resistance is connected in series with another resistance of 4 Ω resistance. A
potential difference of 20 V is applied across the combination. Calculate :
a) Current through circuit
b) Potential difference & current across 6 Ω resistor.
(3)
31. Draw symbol of a plug key (closed), rheostat, a voltmeter.
(3)
32. On what factor the resistance of a conductor depends, give it mathematical expression.
Calculate resistivity of a metal of length 2m at 200C having the resistance of 20 ohm and diameter
of 0.3 mm.
(3)
CHEMISTRY
I .VERY SHORT ANSWER TYPE QUESTIONS: [1MARK]
1.
2.
3.
4.
5.
6.
State one basic difference between a physical change and a chemical change.
What is meant by a chemical reaction?
State the main difference between an endothermic and an exothermic reaction.
What happens chemically when quicklime is added to water filled in a bucket?
On what basis is a chemical equation balanced?
What change in colour is observed when white silver chloride is exposed to sunlight?
State the type of chemical reaction in this change.
7. Write the balanced chemical equation for the reaction between sodium chloride
and silver nitrate indicating the physical state of the reactants and products .
8. Why do potato chip manufacturers fill the packet of chips with nitrogen gas?
9. In the electrolysis of water , why is the volume of gas collected over one electrode
double that of gas collected over the other electrode?
10. Balance the following equation:
Fe (s) + H2O(g) -----> Fe3O 4 (s) + H 2 (g)
II SHORT ANSWER TYPE QUESTIONS (I)
[2 MARK]
1. Write balanced chemical equation for the reaction between magnesium and
hydrochloric acid .Name the product obtained ,identify the type of reaction.
2. Describe an activity to observe what happens when quick lime is added to water
taken in a beaker . State the two important observations and name the type of
reaction taking place.
3. What is the colour of ferrous sulphate crystals ? How does this colour change on
heationg? Name the products formed and state the type of chemical reaction?
4. A white salt on heating decomposes to give brown fumes and a residue is left
behind. Name the salt and write the equation for the decomposition reaction.
5. What is an oxidation reaction? Identify the substance oxidized and reduced in
the following reaction: ZnO + C -------> Zn + CO
III SHORT ANSWER TYPE QUESTIONS (II)
[3 MARK]
1. What is rancidity? Mention two ways by which rancidity can be prevented.
2. Write balanced chemical equation for the reactions that take place during
respiration .Identify the type of combination reaction that takes place during this
process and justify the name .Give one more example of this type of reaction.
3. 2g of lead nitrate powder is taken in a boiling tube The boiling tube is heated over
a flame . State the colour of fumes evolved and the residue left. Name the type of
chemical reaction that has taken place stating its balanced chemical equation.
4. What is meant by : a) Displacement reaction b) Reduction reaction c)
Combination reaction. Write balanced chemical equation for each reaction.
5. It is often observed that the surface of copper powder becomes coated with a
black colour substance when heated in a china dish. How has this black coloured
substance formed? What is the black substance ? Write the chemical equation of
the reaction that takes place.
IV .LONG ANSWER TYPE QUESTIONS
[5 MARK]
1. Write the balanced chemical equations for the following reactions and identify
the type of reaction in each case.
a) Iron (III) oxide reacts with aluminium and gives molten iron and aluminium
oxide.
b) Magnesium ribbon is burnt in an atmosphere of nitrogen gas to form solid
magnesium nitride.
c) Chlorine gas is passed in an aqueous potassium iodide solution to form
potassium chloride solution and solid iodine.
d) Ethanol is burnt in air to form carbon dioxide , water and releases heat.
2. A solution of potassium chloride when mixed with silver nitrate solution , an
insoluble white substance is formed. Write the chemical reaction involved and
also mention the type of the chemical reaction.
3. A substance X , which is an oxide of group 2 element , is used intensively in the
cement industry. This element is present in bones also . On treatment with
water forms a solution which turns red litmus blue. Identify X and also write
the chemical reactions involved.
4. Grapes hanging on the plant do not ferment but after being plucked from the
plant can be fermented . Under what conditions do these grapes ferment? Is it
a chemical or a physical change?
5. Why do we store silver chloride in dark coloured bottles ?Explain with chemical
equations.
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BIOLOGY
ONE MARK QUESTIONS: (1)
1. Define nutrition.
2. What is Cellular Respiration?
3. Name the energy currency released during Cellular Respiration.
4. Why is Carbon dioxide carried in dissolved state in the blood?
5. Name the cells that help in opening and closing of the pore in leaf.
6. What regulates the exit of food from stomach?
7. Name the first part of small intestine.
8. Name the group of animals that need longer small intestine.
9. Name the largest part of alimentary canal.
10. Name the chemical kept in Bell jar experiment. Write its functions.
TWO MARKS QUESTIONS: (2)
1.
2.
3.
4.
5.
6.
7.
What are the outside raw materials used by an organism?
What are the differences between autotrophic and heterotrophic nutrition?
Where do plants get each of the raw materials for photosynthesis?
What is the role of acid in the stomach?
What is the function of digestive enzymes?
How is the small intestine designed to absorb digested food?
What advantage over an aquatic organism does a terrestrial organism have with
regard to obtaining oxygen for respiration?
8. How are Oxygen and Carbon dioxide transported in human beings?
9. How are fats digested in our body? Where does this take place?
10. What is the role of saliva in the digestion of food?
11. What are the differences between aerobic and anaerobic respiration? Name some
organisms that use the anaerobic mode of respiration.
12. How are the alveoli designed to maximise the exchange of gases?
13. Name the respiratory pigment. Where is it found in the body?
14. What are the functions of Bile Juice?
15. Name the two secretions received by the small intestine.
THREE MARKS QUESTIONS: (3)
1. Why is diffusion insufficient to meet the oxygen requirements of multi-cellular
organisms like humans?
2. What criteria do we use to decide whether something is alive?
3. What processes would you consider essential for maintaining life?
4. What are the different ways in which glucose is oxidized to provide energy in various
organisms?
5. How are lungs designed in human beings to maximize the area for exchange of
gases?
6. What are the necessary conditions for autotrophic nutrition? What are its by
products?
7. Explain the process of photosynthesis in brief.
8. What are the functions of HCl, salivary amylase, mucus and pepsin?
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