1. Work done by centripetal tirce is always: -
(a) Maximum (b) Minimum (c) Zero (d) None of these
2. A body of mass 5 kg is moving with a
momentum of 10 kg rns. A force of 0.2 N acts on it in the direction of motion
of the body for 10 seconds. The increase in kinetic
energy is:
(a) 2.8 J (b) 3.2 J (c) 3.8 J (d) 4.4 J
3. The kinetic energy of a light and a heavy
object is same. Which object has maximum momentum?
(a) Light object (b) Heavy object
(c) Both have same momentum (d) N.O.T
4. Two bodies of mass 1 kg and 2 kg have equal
momentum. Then the ratio of their kinetic
energies is:
(a) 2:1 (b)3:1 (c) 1:3 (d) 1:1
5. A body fallen from height h . After it has
fallen a height h12 , its vill possess:
(a) Only potential energy (b) only kinetic
energy
(c) half potential half kinetic energy (d) more
kinetic and less potential
6. Which of the following quantity can be
calculated by multiplying force and velocity?
(a) acceleration (b) power (c) torque (d) work
7. The minimum velocity given to an object so that
it emerges out from the gravitational
field of earth is about
(a) 11.2 km/s (b) 15.3 km’s (c) 5 km/s (d) 9.8
km/s
8. When one joule of work is done on a body in
one second, power of body is said to be:
- (a) One watt (b) 0.5 watt (C) zero (d) 100
watt
9. The absolute potential energy of an object
depends on:
(a) The object’s mass and height (h) The
object’s mass and speed (c) The object’s shape and size (d) The object’s color
and temperature
10. The escape velocity of a planet depends on
which of the following factors?
(a) The mass of the planet only
(b) The radius of the planet only
(c) Both the mass and the radius of the planet
(d) The density of the planet
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