Cadet College
2nd
Term-End Examination 2008
Class- IX
Subject- Physics ( Subjective)
Time: 2 hrs. Total Marks: 50
Answer any five
from group A and Group B.
Group -A
1. Define
velocity and speed. 1+1=
2
2. What do you
mean by incrtia ? 2
3. What is
momentum? 2
4. Define force
and unit of force. 1+1=2
5. How sound is
produced? 2
6. Define
audibility range and infrasonic wave. 1+1=2
7. What do you
mean 20 J of work? 2
Group -B
8. a) Write down the difference between
scalar quantity and vector quantity. 4
b) Deduce first law from the second law of
Newton's law of motion. 4
9. a) Prove
F = ma 5
b) A froce of 100 N acts on a stationary
body of mass 50 Kg for 2 seconds. What will be
the
velocity of the body at the end of this time? 3
10. a) Deduce the law of conservation of
momentum. 6
b) What are the advantages of friction? 2
11. a) Derive, S = ut + 
a t2. 6
a t2. 6
b) A bullet of mass 10 g leaves the barrel
of a gun of mass 6 Kg at the velocity of 300 ms-1.
Determine
the backward velocity of the gun. 2
12. a) What is sound pollution? 2
b) Find the least distance between the
source of sound and the reflector to hear an echo. 6
13. a) Mention some uses of ultrasonic waves. 2
b) Describe the process of determining the
depth of a well by means of echo. 6
. .
14. a) Show that W = F. S 4
b) Explain work done by a force and
against the force. 4
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