Academy For
Excellence Chung lahore
Test –physics Chap# 4complete Total no # 20
Q#1 Choose the correct answer from the
followings. (5)
1. The units of energy are the same as that of
(a) force
(b) power (c)
work (d) torque
2. The muscular power of an athlete who spends 500 J
of energy to lift a load in 2 s is
(a) 125 W (b) 250 W
(c) 500 W (d) 1000 W
3. If the mass and speed of a body are doubled, its
kinetic energy becomes
(a) 3 times (b) 4 times (c) 8 times (d) 16
times
4. The absolute potential energy of a body in the
gravitational field of Earth is
(a) directly proportional to the
mass of the body
(b) inversely proportional to the
mass of the body
(c) independent of the mass of
the body
(d) none of these
5. 1 kWh equals
(a) 0.36 MJ (b) 3.6
MJ (c) 36 MJ (d) 360
MJ
Q#2 SHORT QUESTIONS (8)
1) Define conservative force
2) Describe escape velocity
3) Define potential energy and Elastic
potential energy.
4) Describe work energy principle
Q#3 LONG QUESTIONS (7)
a. Write a note on interconversion of
Potential energy and Kinetic energy.
b. A child starts from rest at the top
of the slide of height 4 m. (a) what is his speed at the bottom if the slide is
frictionless? (b) if he reach the bottom
with a speed of 6 ms-1 what percentage of his total energy at the
top of the slide is lost as a result of friction?
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