1. INDIRAPURAM PUBLIC SCHOOL
SESSION: 2010 – 2011
Holiday Homework
Class X
SOCIAL SCIENCE- Prepare a project on Disaster Management in any one of the
following themes.
Project 1- Role of Govt./Non Government functionaries in your locality in Disaster
Management
Project 2- Generating Awareness on disaster management
Project 3- Preparation of modes of Disaster Resistance structures
Project 4-Pocket Guide on First Aid
Project 5-Insttutional case study on disaster management.
Project 6-Communcation facilities for Disaster Management
Project 7- Preparation of Disaster Contingency Plan
ENGLISH-
-Extract information about the life of any eminent personality. Then write his/her Bio-
sketch in 100 words.
-Prepare a scrapbook on upcoming Commonwealth Games.
CHEMISTRY-
Solve the following worksheet:
1. List the important ways n which you can make a chemical equation more
influencive.
2. Why should be magnesium ribbon be cleaned before burning in air?
3. (a) Name the gases evolved at anode and cathode on electrolysis of water.
(b) What is the ratio of gases evolved on electrolysis o water?
4. Give example of combination reaction in which
(a) An element reacts with another element to form a single compound.
(b) Two compounds combine to form a single compound.
5. Why is respiration considered as an exothermic reaction?
6. What happens when sulphuric acid is poured on zinc granules? Write all
your observations along with the relevant chemical equation.
7. What is the difference between displacement and double displacement reaction?
8. Explain the thermal decomposition giving a suitable example.
PHYSICS
Solve the following problems
1. For which position of an object, a concave mirror forms an enlarged virtual
image?
2. For what position of an object, a concave mirror forms a real image equal to the
size of the object?
3. Find the power of a concave lens of focal length 2 m.
4. A diverging lens has a focal length 3 cm. calculate its power and give the units of
power.
5. A thin lens has a focal length of – 25 cm. what is the power of the lens and what
is its nature?

2. 6. A concave mirror produces three times magnified (enlarged) real image of an
object placed 10 cm in front of it. Where is the image located?
7. The radius of curvature of a spherical mirror is 20cm. what is its focal length?
8. A convex lens produces three times magnified (enlarged) real image of an object
placed 20 cm in front of it. Where is the image located?
9. An object is kept at a distance of 5 cm in front of a convex mirror of focal length
10 cm. calculate the position and magnification of the image and state its nature.
10. A concave mirror produces a real image of height 2cm of an object of height 0.5
cm placed 10 cm away form the mirror. Find the position of the image and focal
length of the mirror.
11. An object 1 cm high is placed on the axis and 15 cm from a concave mirror of
focal length 10 cm. find the position, nature, magnification and size of the image.
12. An object, 2 cm high is placed at 10 cm from a concave mirror. A real and
inverted image, 4 cm high is formed at 20 cm from the mirror. What is the focal
length of the mirror and the magnification produced?
13. An object, 2.5 cm tall is placed at a distance of 15 cm from a concave mirror of
focal length 10 cm. by drawing the ray diagram, find the position, size and nature
of the image formed.
14. An arrow, 2.5 cm high is placed at a distance of 25 cm from a diverging mirror of
focal length 20 cm. find the nature, position and size of the image formed.
15. A convex lens forms a real and inverted image of a needle at a distance of 50 cm
from it. Where is the needle placed in front of the convex lens, if the image is
equal to the size of the object? Also find the power of the lens.
16. A small object is so placed in front of a convex lens of 6 cm focal length that a
virtual image is formed at a distance of 25 cm. find the magnification.
17. An object is place at a far off distance in front of a convex lens of focal length 15
cm. state the position of the image.
18. Find the position, and nature of the image of an object 5 cm high and 10 cm in
front of a convex lens of focal length cm.
19. An object 2 cm high is placed at a distance of 10 cm from a convex lens of focal
length 20cm. find the position, nature and size of the image.
20. A convex lens has a focal length of 25 cm. Calculate the distance of the object
from the lens if the image is to be formed of the opposite side of the lens at a
distance of 75 cm from the lens. What will be the nature of the image?
21. A 5 cm tall object is placed perpendicular to the principal axis of a convex lens of
focal length 20 cm. The distance of the object from the lens is 30 cm. Find the (i)
position (ii) nature and (iii) size of the image formed.
22. An object is placed at a distance 4cm from a concave lens of focal length 12 cm.
find the position and nature of the image.
23. An object which is place 10 cm in front of al lens produces a real image three
times magnified. Where is the image formed? What is the focal length of the lens?
24. An object placed at a distance of 50 cm from a lens produces a virtual image at a
distance of 10 cm in front of the lens. Draw a diagram to show the formation of
image and calculate the focal length of the lens.
25. An object 5 cm high is held 25 cm away form a converging lens of focal length
f=10 cm. Draw a suitable scale diagram and find the position and size of the
image formed. Is the image real or virtual?

3. BIOLOGY
Prepare a presentation for the Symposium on any one of the following topics:
1. Technology a Boon or a Bane
2. Chemical food supplements A Boon or a Bane
3. Plastics, a Boon or a ban.
4. Use of Chemicals in Agriculture, A Boon or a Bane
nloha
fgUnh& nloha
1- lelkef;d leL;kvksa ij vk/kkfjr lekpkjksa rFkk fprzksa dk ladyu
djsa rFkk
fdlh ,d fprz dks ns[kdj o lekpkj dks i<+dj 5 cgqfodYih; iz'
u rS;kj djsa A
2- thou esa gkj vFkok vlQyrk gesa cgqr dqN fl[kk tkrh gS A bl
fo"k; ij
vius fopkj izdV djsa A
3- vius ikB~;dekuqlkj O;kdjf.kd dk;Z] ikBksa ,oa dforkvksa dk iqu%v
H;kl djsa A
uksV & lkjk dk;Z O;kdj.k dkWih esa djsa A
SANSKRIT
. d{kk & n’keh
laLd‘r & 1- nSfud lekpkji= ds vUrxZr eq[; lekpkj dks laLd‘r HkkÔk esa
fyf[k,A ¼dksbZ nl lekpkj½

4. 2- ljLorh ef.kdk O;kdj.k & i= ys[ku ist ua-&60 ls 65 rd
MATHEMATICS
Choose the correct answer
1. The sum and product of the zeroes of a quadratic polynomial are -1/2 and -3
respectively. The quadratic polynomial is
(a) 2x2 – x + 6 (b) 2x2 +x + 6 (c) 2x2 +x – 6 (d) x2 +x – 6
2. For what value of k the following pair of linear equations has infinitely many
solutions.
x + (k + 1)y =5 ; (k + 1 )x + 9y = 8k – 1
Y
(a) 1 (b) 2 (c)3 (d) 4
3 In the graph of y = f(x) the number of zeroes of f(x) is equal to
X’ A B
(a) 1 (b) 2 (c) 3 (d) 4
Y’
4. In the given figure DE // BC and AD = 1cm BD = 2cm .What is the ratio of the
area of ∆ ABC to the area of ∆ ADE
A
(a) 1: 9 (b) 1:3 (c) 3:1 (d) 9: 1
D E
B C
5. Find the ratio of the areas of two similar triangles if their corresponding sides are in
the ratio 4:9
(a) 4:9 (b) 16: 81 (c) 81: 16 (d) 9: 4
6. The following pair of linear equations has
4
x + 2y = 8 ; 2x + 3y = 12
3
(a) one solution (b) no solution (c) many solutions (d) none of these
7. If in ∆ ABC AB2 = 2AC2 then the triangle is
(a) isosceles triangle (b) right triangle (c) right angled isosceles triangle (d) equilateral
triangle
8. If one of the zeroes of the polynomial x2 – 2px – 4 is 2, the value of p is

5. (a) 0 (b) 2 (c) 1 (d) -4
9.The quadratic polynomial whose zeroes are 2+ 5 and 2 - 5 is
(a) x2 + 4x + 1 (b) x2 – 4x +1 (c) x2 – 4x – 1 (d) x2 + 4x – 1
(b)
10. D, E & F are respectively the mid points of the sides BC,CA& AB of ∆ABC. The
ratio of the areas of ∆DEF & ∆ABC is
(a) 1:4 (b) 4 : 1 (c) 1: 2 (d) 2: 1
11. For what value of p and q the following pair of linear equations has infinitely
many solutions
2x +3y = 7 ; (p + q )x + (2p – q)y = 21
(a) p = 1 ;q = 2 (b) p = 3 ;q = 5 (c) p = 5 ; q = 1 (d) p = 5 ; q = 4
12. On dividing x3 – 3x2 +x + 2 by a polynomial g(x) ,the quotient and remainder are
(x-2) and (– 2x + 4) respectively , then g(x) is
(a) x2 + x – 1 (b) x2 – x +1 (c) x2 – x – 1 (d) x2 + x + 1
13. If the zeroes of the polynomial 3x2 – px + 5 are 2 and q respectively. The values of p
and q are
2 5 17 6 17 5 2 6
(a) p = and q = (b) p = and q = (c) p = &q= (d) p = &q=
17 6 2 5 2 6 17 5
14. If 2x – 3y = 7 and (a + b)x – (a+b -3)y = 4a +b represent coincident lines, then and b
satisfy the equation
(a) a +5b = 0 (b) 5a +b = 0 (c) a – 5b = 0 (d) 5a – b = 0
15. If α and β are the zeroes of the quadratic polynomial f(x) = 6x2 + x – 2 find the
value of
α β
+
β α
− 12 25 25 20
(a) (b) (c) (d)
25 − 12 12 31
16.If the system of equations 2x + 3y = 7 ; 2ax + (a + b )y = 28 has infinitely many
solutions then
(a) a = b (b) b = 2a (c) a + 2b = 0 (d) 2a + b = 0
17If D = degree of a polynomial and Z= zeroes of a polynomial then
(a) Z= D (b) Z < D (c) Z > D (d) Z ≤ D
18.If a line is parallel to one side of a triangle then it divides the other two sides

6. (a) Equally (b) same ratio (c) unequally (d) none of these
19. If p (k) = 0 then k in polynomial p(x) is its
(a) Zero (b) one (c) factor (d) remainder
20. P and Q are points on the sides AB and AC respectively of a ∆ ABC . If AP = 5.4
cm, PB = 1.8 cm , AC = 2.8 cm and AC = 4.2cm .Then
(a) PQ//AB (b) PQ// BC (c) PQ // AC (d) none of these
2. Prepare a power point presentation on any one topic of your choice from the
lessons taught till now.
3. Make a three dimensional model on any one topic
(a) Frustum
(b) Tessellation
(c) Pyramids
(d) Angle of elevation and angle of depression
(e) Polyhedron design
(f) Model showing combination of two or more solid shapes
Send your power point presentation at niveditasaxena.ips@gmail.com
I.P.
Collect information on e-commerce from internet and make a hard copy of it.