Download Summer Holiday Home work Session 2012

Summer Holiday Home work
Session 2012-2013
Subject:Social Science
CLASS XB
What do you know about UNO, Describe its objects, organs of UNO, Importance of UNO and Explain these
agencies:-UNICEF, UNESCO, WHO, ILO, WTO in 200 words
Class X A –
Social
What do you know about UNO, importance of UNO, describe its
objectives, organs of UNO, importance of UNO. Explain these
agencies: - UNICEF, UNESCO, WHO, WTO in 200 words.
Class X A and B
Subject: Physics
Electricity
1. What is the unit of electric charge?
2. What is resistance?
3. The potential difference applied across a wire is doubled, how does the resistance of the wire is affected?
4. State ohm’s law. Give mathematical expression for the same.
5. Current of 4 A flows through a 12 V car headlight bulb for 10 minutes. How much energy is consumed during
this time?
6. A wire is stretched to double its length how does the resistance of the wire is affected?
7. A bulb is rated 5 V, 5 mA. Find the power and the resistance of the bulb.
8. How can three resistances of 2 Ω, 3 Ω and 6 Ω be connected to give a total resistance of (a) 4 Ω (b) 1 Ω?
9. Derive expression for the series combination of resistances. Why does the cord of an electric heater not glow
while the heating element does?
10. Define 1 A.
11. What is an electric circuit?
12. A wire is stretched to double its length how does the resistivity of the wire changes?
13. Two lamps, one rated 100 W, 220 V and the other rated 60 W, and 220 V, are connected in parallel to the
electric mains of 220 V, what current is drawn from the mains.
14. Define resistivity and state its S.I. unit.
15. On what factor does the resistance of a wire depends?
16. Draw a schematic diagram of a circuit consisting of a battery of three cells of 2 V each, a 5 Ω resistor, an 8 Ω
resistor, and a 12 Ω resistor, and a plug key, all connected in series. Find the current through the circuit.
17. An electric iron consumes energy at a rate of 840 W when heating is at the maximum rate and 360 W when the
heating is at the minimum. The voltage is 220 V. What are the current and the resistance in each case?
18. Derive expression for the parallel combination of resistances. If the potential difference across a wire is
doubled then how does the heat produced in the wire is affected?
19. Define 1 Volt.
20. An electric bulb is connected to a 220 V generator. The current is 0.50 A. What is the power of the bulb?
21. The current flowing through a wire is doubled how does the resistance of the wire is affected?
22. State joules law of heating.
23. Define the commercial unit of the electrical energy? Find its value.
24. A wire is stretched to triple length how does the resistance of the wire is affected?
25. Show how you would connect three resistors, each of resistance 6 Ω, so that the combination has a resistance
of (i) 9 Ω, (ii) 4 Ω.
26. An electric iron consumes energy at a rate of 840 W when heating is at the maximum rate and 360 W when the
heating is at the minimum. The voltage is 220 V. What are the current and the resistance in each case?
27. What is the SI Unit of electric Potential?
28. What do you mean by the statement; "The electric potential between the points A and B is 1 V"?
29. There are two electric bulbs, one marked 60W 220V and the other marked 100W 220V. Which one of the two
has a higher resistance?
30. Name a metal which offers higher resistance to the passage of electricity than copper.
31. Calculate the ratio of resistances of a 50W bulb and a 25 W bulb.
32. Why is tungsten preferred to make the filament of an incandescent lamp?
33. A wire of resistance 10 Ω is bent in the form of a circle. What is the effective resistance between the two
points at the ends of any one of the diameter of the circle?
34. What is represented by joule/coulomb?
35. A charge of 2C moves between two plates, maintained at a p.d of 1V. What is the energy acquired by the
charge?
36. Why are copper wires used as connecting wires?
37. A wire of resistivity ρ is stretched to double its length. What is its new resistivity?
38. What is the resistance of an ideal ammeter?
39. What is the resistance of an ideal Voltmeter?
40. Which has more resistance: 100W bulb or 60W bulb?
41. How will you join three resistances, each of 2Ω so that the effective resistance is 3Ω?
42. What happens to the current in a circuit if its resistance is doubled?
43. What happens to the resistance of a circuit if the current through it is doubled?
44. How does the resistance of a wire depend upon its radius?
45. Two wires are of the same length, same radius, but one of them is of copper and the other is of iron. Which will
have more resistance?
46. Two wires of same material and same length have radii r1 and r2. Compare their resistances.
47. Given n resistors each of resistors R. How will you combine them to get the (i) maximum and
(ii) minimum
effective resistance? What is the ratio of the maximum to minimum resistance?
48. A wire of length L and resistance R is stretched so that its length its doubled. How will its (a) Resistance change
(b) Resistively change?
49. A household uses the following electric appliances : (i) Refrigerator of rating 400W for ten hours each day. (ii)
Two electric fans of rating 80W each for twelve hours each day. (iii) Six electric tubes of rating 18W each for 6
hours each day. Calculate the electricity bill of the household for the month of June if the cost per unit of
electric energy is Rs. 3.00.
50. Ammeter burns out when connected in parallel. Give reasons.
Class X A and B
Subject:Chemistry
PROJECT:1. Exothermic and endothermic reaction. (for Roll no. 1-20)
2. Chemical volcano.( for Roll no 21 onwards)
2.
H.O.T.S
(a) The marble statue often slowly get corroded when kept in open for a long time. Assign a suitable
explanation.
(b) The gases hydrogen and chlorine do not react with each other even if kept together for a long time. However in the
presence of sunlight, they readily combine. What does actually happen?
(c ) A water insoluble substance “X” reacting with dilute sulphuric acid released a colourless and odourless gas
accompanied by brisk effervescence .When the gas was passed through water, the solution obtained turned bluelitmus
red. On bubbling the gas through lime water ,it initially becomes molky and the milkiness disappeared when the gas
was passed in excess.Identify the substance “X” and write the chemical equation of the reaction involved.
3. NCERT : In text question answer- Qns 1 to 5 of chapter 2
4. NCERT : Text question-answer – Qns 1,2,3,5 and 6
CLASS XA
Subject: MATHS
1. Find the zeroes of the following quadratic polynomials and the relationship between the
zeroes & coefficients;
x2 – 7x – 10
i.
4x2 + 12x +9
ii.
2x2 – 1
iii.
4x2 – 4x – 32.
2.
Find the quadratic
polynomial , the sum and product of whose are given below ;
a.
2, -3
b.
-3, -7
2, 2  2
c.
3.
Find a cubic polynomial
having ,  and  as their zeroes s.t. ++=
17
5
,  + + =
6
6
And  = -5
4.
Find all the zeroes of x4 +
3x3 – 20x2 – 6x + 36 if two of its zeroes are
2 & 2
5.
Find all the zeroes of the
polynomial 2x3 + 5x2 – 28x – 15.
Find all the zeroes of x4 –
6.
4x3 -2x2 + 12x – 3, if two of its zeroes are 2  3, 2  3
7.
Obtain all the zeroes of
3x4 + 6x3 – 2x2 -10x -5, if two of its zeroes are
8.
5
5
and 
3
3
The age of father is twice
the sum of ages of his two children, ten years hence, the age of father will be three quarters
of the sum of the ages of their children then, find the present age of the father.
9.
Verify that the numberts
given along side each of the cubic polynomial given below are their zeroes. Also verify the
relationship between zeroes & coefficient in each case :
i.
X3 -7x +6; 1, 2, -3
ii.
2x3 +7x2+2x-3; -1, -2, 1/2
10.
Solve Exercise- 3.5 only
Q. 4
& Exercise-3.6 by Cross-multiplication method only.
Name this mathematician?
Class – X-B
Sub: Math
1.
Which is irrational
(a)
2.
(b)
4
none of these
is
(c)
7
(d)
1
(b)
0
(c)
-1
(d)
none of these
The value of 2161/3 is
(a) 72
5.
(d)
Degree of zero polynomial is
(a) 1
4.
(c)
Degree of polynomial
(a) 3
3.
(b)
(b) 4
(c)
6 (d)
8
Which is not a polynomial
(a)
(b)
6.
Find the zeroes of a polynomial
7.
Divide the polynomial
quotient and remainder.
(c)
(d)
all
.
by the polynomial
and find the
8.
Find zeroes of (i)
9.
Find the value of k, if x-1 is a factor of
10. If
and
(ii)
.
.
α and β are the zeroes of a polynomial
, find α2 + β2.
11. Prove
that
12. Using
Euclid’s Division Lemma, find HCF of 180670 and 2937.
is an irrational number.
13.
Solve graphically the system of linear equations:
14.
and
Solve:
15. If the two zeroes of a polynomial
16. Use
by cross multiplication method.
are
, find other zeroes.
Euclid’s Division Lemma to show that the square of any positive integer is either of the form
3m or 3m+1 for some integer m.
17. State
and prove Thales theorem.
CLASS –X A &B
SUBJECT -MATHS
CHAPTER -1
REAL NUMBERS
1. Use Euclid’s algorithm to find the HCF of 4052 and 12576.
2. Show that any positive odd integer is of the form 4q + 1 or 4q + 3, where
q is some integer.
3. An army contingent of 616 members is to march behind an army band of 32
members in
a parade. The two groups are to march in the same number of columns. What is the
maximum number of columns in which they can march?
4. Use Euclid’s division lemma to show that the cube of any positive integer is of
the form
9m, 9m + 1 or 9m + 8.
5. Consider the numbers 4n, where n is a natural number. Check whether
there is any value of n for which 4n ends with the digit zero
6. Explain why 7 × 11 × 13 + 13 and 7 × 6 × 5 × 4 × 3 × 2 × 1 + 5 are composite
numbers.
7. Find the LCM and HCF of the following integers by applying the prime
factorization method.
(i) 12, 15 and 21 (ii) 17, 23 and 29 (iii) 8, 9 and 25
8. Prove that √5 is irrational.
9. Without actually performing the long division, state whether the following
rational numbers will have a terminating decimal expansion or a non-terminating
repeating decimal expansion:
(1)13\3125 (2) 17\8 (3) 64\455
MATHS PROJECT
Π –THE WORLD MOST MYSTERIOUS NUMBER
MATHS ACTIVITY
TO FIND THE HCF OF TWO NUMBERS EXPERIMENTALLY BASED ON EUCLID
DIVISON LEMMA
CHAPTER -6
TRIANGLES
1. : If a line is drawn parallel to one side of a triangle to intersect the other two sides in distinct points, the other two
sides are divided in the same ratio.
2. If a line intersects sides AB and AC of a ABC at D and E respectively and is parallel to BC, prove
thatAD\AB=AE\AC
3. ABCD is a trapezium in which AB || DC and its diagonals intersect each other at the point O. Showthat\AO \ BO= CO\DO
4. If in two triangles, corresponding angles are equal, then their corresponding sides are in the same ratio (or
proportion) and hence the two triangles are similar
5. If in two triangles, sides of one triangle are proportional to (i.e., in the same ratio of ) the sides of the other triangle,
then their corresponding angles are equal and hence the two triangles are similiar
6.: If one angle of a triangle is equal to one angle of the other triangle and the sides including these angles are
proportional, then the two triangles are similar.
7. A girl of height 90 cm isalking away from the base of a lamp-post at a speed of 1.2 m/s. If the lamp
is 3.6 m above the ground, find the length of her shadow after 4 seconds
8. E is a point on the side AD produced of a parallelogram ABCD and BE intersects CD at F. Show that ABE ~ CFB.
9. D is a point on the side BC of a triangle ABC such that ADC = BAC. Show that CA = CB.CD.
2
कक्षा -१० A and B
Hindi
51. १. अपनी रूचि अनुसार एक उपन्यास पढ़कर उसकी समीक्षा कीचिए।
52. २. ग्रीष्मकालीन छु ट्टियों में ककए गए ककसी स्थान के भ्रमण पर यात्रा-वृत्त चलखो।
53. ३. २५ समस्रुचिचिन्नाथथ शब्द चलखकर वाक्य में प्रयोग कीचिए।
54. ४. ककसी िी चवषय पर (गद्य,पद्य या व्याकरण ) PPT िैयार कीचिए।
55. ५. ग्रीष्मकालीन अवकाश में अपने चमत्र व उनके पट्टरवार को पंिमढ़ी चिल स्टेशन घूमने का चनमंत्रण देिे हुए पत्र
चलचखए ।
Class:- X A
English
1. You are the student editor of your school magazine using the information given below
Write a brief paragraph on the Visit of Smt. Sheela Dixit
Smt. Sheela Dixit – the chief guest on Annual Day – School nicely decorated – received at the gate –
garlanded – gave away the prizes – speech – thanks giving
2. You are Ravi . You are great fan of Tendulkar . Your friend Geeta insist that Tendulkar has passed his
climax and should get retirement . You opposed it . Compose dialogues around 100 words.
3. Write a letter to the editor of National Daily on the need of balanced diet to the children who are
facing deficiency today .
4. Sumeet is to speak against the motion ‘ Homework should be Abolished’ in a debate .
Write a speech in about 150 words .
5. Find out three unseen passages and compose short answer as well as MCQs .
Class X B
English Communicative
1) Complete the passages by choosing the appropriate options
2) Gap - filling passages
3) Cloze (gap filling exercise with blanks at regular intervals
4) Sentence completion
5) Re-ordering word groups into sentence
6) Editing
7) Dialogue – completion
8) Sentence – transformation
English communicative Work-Book
Chapters – 1, 2, 3, 11, 12, 13, 14.