CLASS – X
SUB : PHYSICS MODEL TEST
Time :2 hours Marks-40
[ N.B. – The figures in the right margin indicate full marks. Answer any five questions from group A and any five questions from group B ]
[ N.B. – The figures in the right margin indicate full marks. Answer any five questions from group A and any five questions from group B ]
A-GROUP
1. What do you understand by dimensional
equation ? What is vernier constant ? 1+1=2
2. What is a simple pendulum ? What is centre
of gravity ? 1+1=2
3. Distinguish between energy and power. 2
4. Derive the relation V = fl. 2
5. What is anomalous expansion of water ?
What is vaporisation ? 1+1=2
6. Room made of glass or green house always
remains hot. Explain the cause of this. 2
7. State and explain inverse square law of
illumination. 1+1=2
8. Describe the characteristics of images
produced by a plane mirror. 2
9. State the laws of resistance. 1+1=2
10. Describe the characteristics of
electromagnetic waves. 2
B-GROUP
11. a) Define
unit of force. For a body moving with uniform acceleration starting from rest,
prove that the distance travelled is proportional to the square of the time. 4
b) A
bullet of mass 10 g
having a velocity of 300 ms – 1 stops after penetrating 4.5 cm within a piece of
wood. Find the penetrating force. 2
12. a) What
is acceleration due to gravity ? Show how acceleration due to gravity may be
expressed in terms of mass and radius of the earth and gravitational constant. 1+3=4
b) An athlete of mass 60 Kg stood first in a 100 m race. He took 12.5 s,
what was his kinetic energy, while running ? 2
13. a) What
is buoyancy ? Describe a process for determining the specific gravity of a
solid insoluble in water and heavier than water. 1+3=4
b) The
ratio of the diameters of the larger and smaller pistons of a Hydraulic press
is 3 : 1. How much force is to be applied to the smaller piston to obtain a
force of 1800 N on the larger piston ? 2
14. a) Deduce
the relation between real expansion and apparent expansion of liquid. 4
b) If
the temperature of 100 cm3 of glycerin at 00C is raised
through 200C,
its expansion is 1.06 cm3. Find the co-efficient of real expansion
of glycerin. 2
15. a) Describe an experiment to determine the
specific latent heat of fusion of ice.
4
b) Heat
of 8670 J is applied to 300
gm benzene at 230C. What will be its final
temperature ? Specific heat of benzene is 1700 JKg– 1 K– 1. 2
16. a) What is an optical image ? Deduce the relation between the focal length
and radius of curvature of a concave mirror. 1+3=4
b)
If velocity of light in vacuum is
3 ´
10 8 ms – 1, then find the velocity of light in water.
Refractive index of water is 1.33. 2
17. a) What is meant by lens ? Describe with diagram
how virtual image is formed by a convex lens. 1+3=4
b) By
means of a diagram explain critical angle and total internal reflection of
light. 2
18. a) What is electric induction ? Describe how a
metal rod is charged positively by induction. 1+3=4
b) What
will be the intensity of electric field at a point at a distance of 0.5 m apart from a charge of
5 coulombs? 2
19. a) Explain with diagrams how a simple electric
cell produces electric current. 4
b) The
E.M.F. of an electric cell is 1.5 volt. If its internal resistance is 1W and it is
connected with a resistance of 12W then what
amount of current will flow through it ? 2
20. a) What
is X-ray ? Write down the properties and uses of X-ray. 1+2+1=4
b)
Discuss the usefulness and significance
of energy in modern civilization. 2
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