Subject:
Physics (Theoretical)
Class-X Subject code: 136
Time: 2hrs. Marks:40
[N.B: The figures in the right margin
indicate full marks. Answer any five questions from group A and any five from
group-B.]
Group-A
1. What
do you understand by measurement? What is vernier constant? 1+1=2
2. Determine
the dimension of acceleration. State the law of conservation of momentum. 1+1=2
3. What
is centre of gravity? Where does a body become weightless? 1+1=2
4. What
is hydro electricity? What is the necessity of knowing specific gravity? 1+1=2
5. What
do you understand by the limit of audibility? What is linear magnification? 1+1=2
6. What
is an otto cycle? Define solid angle. 1+1=2
7. What
is an optical fiber? What are the conditions for total internal reflection of
light? 1+1=2
8. What
is the angle of minimum deviation? What is meant by intensity of electric
field? 1+1=2
9. What
is scanning? What is radioactivity? 1+1=2
10. What
is Biogas? Mension three uses of X-ray. 1+1=2
Group-B
11. (a) What do you understand by friction?
Dedue the law of conservation of momentum. 1+3=4
(b) A body of mass 4 kg moving with a
velocity of 12 ms-1 meets another body of mass 6kg coming from the
opposite side with velocity of 4ms-1 and becomes a single body. What
will be the velocity of the combined body? 2
12. (a) What is weightlessness? Show that
although the acceleration due to gravity is independent of the material of a
body, it depends on the location of the body. 1+3=4
(b) A simple pendulum oscillates 30 times in
a minute. Find the effective length of the pendulum g = 9.8 ms-2. 2
13. (a) What is buoyancy? Show that the pressure
at a depth `h’ from the surface of a liquid is hpg. 1+3=4
(b) The sp.gr of a metal is 19. What would be
the weight of a volume 25ml of this metal in water? 2
14. (a) Describe Scarle’s method for determining
the thermal conductivity of metals. 4
(b) How much time will be needed when 2.03mj
of heat is conducted through a silver plate of area 50cm2 and
thickness 2mm? The thermal conductivity of silver is 406 wm-1k-1
and the difference of temperature between the two surfaces of the plate is 400c. 2
15. (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) A person uses a concave lens of focal
length 20cm as spectacles. What is the power of the lens?
16. (a) What are the principal defects of
vision? Draw a ray diagram and explain how can short sight be remideed? 1+4=5
(b) Refractive index of glass with respect to
glycerin is 1.09 and velocity of light in glycerin is 2.04×108ms-1.
Find the velocity of light in glass.
17. (a) What is meant by rainbow? Explain with
diagram how rainbow is found? 1+3=4
(b) Why does the sky look blue? 2
18. (a) What is electric induction? Show that F
= qE. 1+3=4
(b) If a body of charge 10 coulombs is placed
is an electric field then it gains a force of 10 Newton’s. If a body having change of 15
coulombs is placed at that point, what will be the magnitude of the force? 2
19. (a) What is an electric motor? Describe the
construction and the working process of an electric motor. 1+3=4
(b) What are fundamental particles? Give
their classification.
20. (a) What is fossil fuel? Describe in brief,
how the fossil fuel meets up the demand of energy of the humankind. 1+3=4
(b) What is radar? What is the type of wave
as used by radar?
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