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Physics 9 Chapter 6 - Work and Energy - 7
1.
Which of the following relation between kinetic energy and work done is correct?
a) K.E. = 1 + FS
b) K.E. = 1 / FS
c) K.E. = FS
d) K.E. = FS / 10
2.
What is the third equation of motion?
a) v
f
+ v
i
= at
b) S = v
i
t
c) 2aS = v
f
2
- v
i
2
d) v
f
= v
i
+ at
3.
What is the formula of kinetic energy?
a) K.E. = mv
2
- 2
b) K.E. = mv
2
+ 2
c) K.E. = mv
2
/ 2
d) K.E. = mv
2
x 2
4.
A car weighing 12 kN has speed of 20 ms
-1
. Find its kinetic energy?
a) 2400 kJ
b) 2.4 kJ
c) 240 kJ
d) 24 kJ
5.
If velocity of a body becomes double, then what will be its K.E. become?
a) Half
b) Four times
c) Doubles
d) Zero
6.
What is the energy possessed by a body due to its motion called?
a) Potential energy
b) Chemical energy
c) Wind energy
d) Kinetic energy
7.
If mass of a body becomes double, then what will be its K.E. become?
a) Doubles
b) Four times
c) Zero
d) Half
8.
A stone of mass 500 g strikes the ground with a velocity of 20ms
-1
. How much is the kinetic energy of the stone at the time it strikes the ground?
a) 20 J
b) 0.5 J
c) 500 J
d) 100 J
9.
When a body during its free fall motion is about to touch the earth’s surface, what will be its K.E.?
a) Zero
b) Minimum
c) Negative
d) Maximum
10.
The kinetic energy of a body of mass 2 kg is 25 J. What will be its speed?
a) 12.5 ms
-1
b) 5 ms
-1
c) 25 ms
-1
d) 50 ms
-1
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