Class-X
Subject: Physics
Time: 2 hrs. Marks:
40
Answer any five from group A and any five from group B.
Group -A
1. What do you
understand by measurement? What is least count? 1+1=2
2. The value of
g at any place is 9.8 ms-2 - What do you mean by this? What is centre of gravity? 2
3. Distinguish
between density and specific gravity. 2
4. What is
sound population? What is reagelation? 1+1=2
5. Define
specific heat? Determine the unit of thermal conductivity. 1+1=2
6. What is otto
cycle? Write down the dimension of accelerations. 1+1=2
7. What is candela?
Define luminous intensity. 1+1=2
8. Define
critical angle with figure. What is optical fibre? 1+1=2
9. What is
consequent pole? What is scanning? 1+1=2
10. What is
biogas? What is Big Bang? 1+1=2
Group -B
11. a) Prove F = ma from Newton's 2nd law of
motion. 4
b) A bullet of mass 10g leaves the barrel
of a gun of mass 6kg at the velocity of 300 ms-1.
Determine
the backward velocity of the gun. 2
12. a) What do you mean by the term
efficiency? Show that if the velocity of a body of mass m
be V, its
kinetic energy is 
mv2. 1+3=4
mv2. 1+3=4
b) If a body of mass 1 kg is dropped from
a height of 20m. What will be its kinetic energy just
before
touching the ground? g = 9.8 ms-2. 2
13. a) State Archimedes principle. Find an
expression for the pressure at a point in a liquid. 1+3=4
b) The sp. gr. of a metal is 19. What
would be the weight of a volume of 25 ml of this metal in water. 2
14. a) What is echo? Describe the process of
determining the depth of a well by means of echo. 4
b) The wavelength of sound wave formed in
water is 8.75 cm. If the speed of the wave is 332
ms-1 and 14535 ms-1 in air and
in water respectively. Find the wavelength in air. 2
15. a) Describe a method for determining the
specific heat of solid. 4
b) Find the amount of heat required to
change 0.1 kg ice at -200C. 2
16. a) Explain with diagram the actions of
four strokes of a petrol engine. 4
b) What will be the illumination of a
point at a distance of 100 cm from a candle of luminous
intensity 5
cd? 2
17. a) Prove that for a particular ray
incident on a plane the angle of rotation of the reflected
ray is
twice the angle of rotation of the mirror. 4
b) Prove that in case of convex
mirror, f = 
. 2
. 2
18. a) What is short sight? Draw a ray diagram
and explain how can it be remedied. 1+3=4
b) Define. Principal focus and optical
centre. 2
19. a) What do you mean by parallel connection
of resistances. Write how the equivalent resistance
is
determined in case of parallel connection of resistances. 1+3=4
b) What is the resistance of the bulb 100w
-220v, and what amount of electricity will pass 2 through it.
20. a) Describe the construction and action of
a transformer. 4
b) Explain how a transistor is used as an
amplifier. 2
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