GENERAL SCIENCE #33
MULTIPLE CHOICE QUESTIONS
1. Which
of the following statements is not correct for an object moving along a
straight path in an accelerated motion?
(a) Its speed keeps changing
(b) Its velocity always changes
(c) It always goes away from the Earth
(d) A force is always acting on it
Answer:
(d)
2. According
to the third law of motion, action and reaction ……………
(a) always act on the same body
(b) always act on different bodies in opposite directions
(c) have same magnitude and directions
(d) act on either body at normal to each other
Answer:
(b)
3. A
goalkeeper in a game of football pulls his hands backwards after holding the
ball shot at the goal. This enables the goalkeeper to ……………
(a) exert larger force on the ball
(b) reduce the force exerted by the balls on the hands
(c) increase the rate of change of momentum
(d) decrease the rate of change of momentum
Answer:
(d)
4. The
inertia of an object tends to cause the object ……………
(a) to increase its speed
(b) to decrease its speed
(c) to resist any change in its state of motion
(d) to decelerate due to friction
Answer:
(c)
5. A
passenger in a moving train tosses a coin which falls behind him. It means that
motion of the train is ……………
(a) accelerated
(b) uniform
(c) retarded
(d) along circular tracks
Answer:
(a)
6. An
object of mass 2 kg is sliding with a constant velocity of 4 ms-1 on a
frictionless horizontal table. The force required to keep the object moving
with the same velocity is ..........
(a) 32 N
(b) 0 N
(c) 2 N
(d) 8 N
Answer:
(b)
7. Rocket
works on the principle of conservation of which of the following?
(a) Mass
(b) Energy
(c) Momentum
(d) Velocity
Answer:
(c)
8. If
the mass of a body is doubled and its velocity becomes half, then the linear
momentum of the body will ……………
(a) remain same
(b) become double
(c) become half
(d) become four times
Answer:
(a)
9. When
a number of forces acting simultaneously on a body bring about a change in its
state of rest or of uniform motion in a straight line, then these forces acting
on the body are said to be which of the following?
(a) Balanced forces
(b) Equal forces
(c) Unbalanced forces
(d) Opposite forces
Answer:
(d)
10. When
a car at high speed makes a sharp turn, the driver in a car tends to get thrown
to the side opposite to the turn. This is due to which of the following?
(a) Inertia of motion
(b) Inertia of time
(c) Inertia of rest
(d) Inertia of direction
Answer:
(a)
11. A
man is standing on a boat in still water. If he walks towards the shore, then
the boat will ……………
(a) move away from the shore
(b) move towards the shore
(c) remain stationary
(d) none of these
Answer:
(a)
12. Which
of the following statement is incorrect?
(a) Mass is measure of inertia of a body.
(b) Newton’s first law of motion is the law of inertia.
(c) Unbalanced force produces constant velocity.
(d) Newton’s third law talks about the direction of the
force
Answer:
(c)
13. A
ball is thrown vertically upward in a train moving with uniform velocity. The
ball will ……………
(a) fall behind the thrower
(b) fall ahead of the thrower
(c) return back to the thrower
(d) fall on the left of the thrower
Answer:
(c)
14. Which
of the following is not an application of conservation of linear momentum?
(a) While firing a bullet, the gun must be held tight to
the shoulder
(b) When a man jumps from a boat to the shore
(c) A rocket explodes on midway from the ground
(d) A body suspended from the hook of a spring balanced
in a lift which is accelerated downward
Answer:
(c)
15. When
we stop pedalling, the bicycle begins to slow down. This is due to which of the
following?
(a) Frictional force acting along the direction of motion
of bicycle
(b) Air resistance which is in the direction of motion
(c) Frictional force acting opposite to the direction of
motion of bicycle by the road
(d) Nature of the bicycle to stop after some time
Answer:
(d)
16. Inertia
is the property of a body by virtue of which, it cannot change by itself ……………
(a) its state of rest
(b) its steady state of uniform motion
(c) its direction of motion
(d) All of the above
Answer:
(d)
17. An
athlete does not come to rest immediately after crossing the winning line due
to which of the following?
(a) Inertia of motion
(b) Inertia of rest
(c) Inertia of direction
(d) None of the above
Answer:
(a)
18. The
masses of two bodies are in ratio 5 : 6 and their velocities are in ratio 1 :
2. Then what will be ratio of their linear momentum?
(a) 5 : 6
(b) 1 : 2
(c) 12 : 5
(d) 5 : 12
Answer:
(d)
19. Which
one of these is not vector quantity?
(a) Impulse
(b) Momentum
(c) Force
(d) None of the above
Answer:
(d)
20. A
object of mass 5 g is pushed on a table. The object starts moving at a speed of
15 m/s and stops in 5 seconds. Find the force of friction exerted by the table
on the object?
(a) .01 N
(b) .012 N
(c) .115 N
(d) .015 N
Answer: (d)
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