Subject : Physics
(Subjective)
Class - IX
Time : 2 hours. Marks.
40
[N.B : Answer any five question from group A and Answer any
five from group B ]
Group : A
1. What is
venire constant ? What is Back lash error ? 1+1
= 2
2. What is
force ? State the low of conservation of momentum. 1+1 = 2
3. Define hydro
electricity. What is the meaning of 60 w-electric bulb ? 1+1 = 2
4. Define solid
angle. What do you mean by 1 candela ? 1+1
= 2
5. What is
Regulation ? What do you mean by Otto cycle ? 1+1
= 2
6. What do you
mean by desired unit ? What do you understand inertia ? 1+1 = 2
7. Define watt
? What do you mean by Thrust ? 1+1
= 2
8. What is
phase ? What is Echo ?
9. What is
Friesian ? Find out the unit of thermal conductivity. 1+1 = 2
10. State coulomb
is law. 2
Group : B
11. Describe with
diagrams in detail the domain theory of magnetism. 6
12. a) What is an
electroscope ? Describe how with the help of this instrument the nature of
charge is detected.
b) In air a charge of 30 coulombs and 50 coulombs
are at a distance of I'm from each other. Find the unsent of force between them. 4+2
= 6
13. a) Describe searle's
method for determining the thermal conductivity of metals.
b) Temperatures of two sides of a brass plate of
thickness 4 m m are 10oc and 300c respectively. 33 KJ amount of heat flows per second through
this plate. If thermal conductivity of brass is 110 w m-1 k -1 then find the
area of the plate. 4+2
= 6
14. a) State and explain
the law of a simple pendulum. 4+2
= 6
b) A simple pendulum Oscillates 30 times in a
minute. Find the effective length of the pendulum 9.8 ms -2.
15. a) From Newton's second law of
motion, Prove the F = ma.
b) A bullet of mass 10 gm leaves the barrel of a
gun of mass 6 kg at the velocity of 300 ms -1.Determine the backward velocity of the gun. 4+2
= 6
16. a) Describe a method
for determining the specific heat of solid.
b) Find the amount of heat required to convert
100 gm ice at -10oc to water at 1000c. Specific heat of ice. melting point of ice and specific latent
heat of fusion of ice are 2100 J Kg-1k-1,ooc
and 336000 JKg-1 K-1
-1 respectively. 4+2
= 6
17. a) Deduce the relation
between real expansion and apparent expansion of a liquid.
b) What is the difference between heat and
temperature ? 4+2
= 6
18. a) Describe the
mechanism for propagation of sound in air.
b) What is sound pollution ?
19. a) Explains the working
principal of a Hydraulic press with a neat diagram.
b) The sp. gr. of a body is 6 and weights 36 N
in air. What is its weight in water ? 4+2
= 6
20. a) Prove the principle
of conservation of energy in case of a freely falling body under the action of gravity.
b) A boy of mass 35 kg can rise 20 steps each
step being 20 cm high in a time of 5 see. What is his power ? 4+2
= 6
Posts
No comments:
Post a Comment