3. Q. If the external force applied is zero, then which of the
following is conserved ?
a) linear momentum
b) angular momentum
c) torque
d) time period
4. Q. No force is required for a body moving with
a) Constant speed on circular path
b) Constant velocity
c) Constant acceleration
d) Variable acceleration
5. Q. Two blocks of masses 6 kg and 4 kg tied to ends of a light
inextensible string passing over a frictionless pulley are
released. Then acceleration of the system will be
a) 2 m/s2
b) 2.5 m/s2
c) 4 m/s2
d) 5 m/s2
6. Q. What is the maximum acceleration of a fireman sliding
down a fixed vertical rope for which breaking strength is α
times his weight
a) g α
b) g/ α
c) (α - 1)g
d)(1 - α)g
7. Q. A block of 2 kg on a horizontal surface is pulled at 300 with
horizontal by a force of 10 N. Then normal reaction on the
block is
a) 10 N
b) 15 N
c) 20 N
d) 25 N
8. Q. 5 kg stone falls from a height of 100 m and penetrates 2 m
in a layer of sand. The time of penetration is
a) 14.28 s
b) 0.089 s
c) 7.14 s
d) 0.89 s
9. Q. A body of mass 5 kg moves along x-axis with 2 m/s.
A second body of mass 10 kg moves along y-axis with
velocity 3 m/s. They collide and move together with
velocity
a)2 m/s
b)4 m/s
c) 4/3 m/s
d) 2 3 m/s
10. Q. A rest substance is broken into 3 pieces. First two pieces of
equal mass move with velocity of 30 m/s in perpendicular
direction, 3rd piece has its mass 3 times the mass of each
equal piece. Find the velocity of 3rd piece,
a) 9.8 m/s
b) 20 m/s
c) 14.4 m/s
d) 30 m/s
11. Q. When a man weighing 10 kg in lift is accelerated downward
with the acceleration of 1 m/s2, then apparent weight is
a) 98 N
b) 88 N
c) 72 N
d) 68 N
12. Q. A 8000 kg rocket is set for a vertical firing. If the exhaust
speed is 800 m/s, the gas ejected per second to overcome
the weight of the rocket is
a) 20 kg/s
b) 50 kg/s
c) 70 kg/s
d) 100 kg/s
13. Q. A body having a mass of 8 kg travels distance of 4, 5 and
6 m respectively in successive seconds. The force acting on
it is
a) 8 N
b) 16 dyne
c) 16 N
d) 4 N
14. Q. Whatever may be the direction of the two forces 6N and 2N
acting on a body of mass 2 kg, the minimum acceleration of
the body can’t be less than
a) 4 m/s2
b) 2 m/s2
c) 3 m/s2
d) 2.5 m/s2
15. Q. Which one of the following group of 3 forces will not
produce acceleration in the body acted by the forces?
a) 4N, 7N, 15N
b) 4N, 7N, 14N
c) 4N, 7N, 12N
d) 4N, 7N, 10N
16. Q. Body of mass 10 kg is moving eastward with a uniform
speed of 2 m/s. A force of 20 N is applied to it towards
north. What is the magnitude of displacement after 2
seconds?
a) 4 m
b) 8 m
c) 4 2 m
d) 8 2 m
17. Q. A gun fires 200 bullets per second with velocity of 500 m/s.
If mass of a bullet is 100 g, the force required to hold the
gun is
a) 1000 N
b) 2000 N
c) 10000 N
d) 100 N
18. Q. A gun fires 200 bullets per second with velocity of 500 m/s.
They strike a vertical wall and rebound back with same
speed along same path. If mass of a bullet is 100 g,
the force acting on the wall is
gun is
a) 4000 N
b) 2000 N
c) 20000 N
d) 200 N
