Class 9 Physics Chapter 3 MCQs Federal Board
Class 9 Physics Chapter 3 MCQs Federal Board
Tick the correct option.
1) Inertia of a body is related to which of the following quantities:
A) mass
B) force
C) weight
D) friction
Correct option is (a)
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2) A force of 5 N is applied to a body weighing 10 N. Its acceleration in
$$m/s^2$$ is:
A) 0.5
B) 2
C) 5
D) 50
Correct option is (a)
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3) SI unit of linear momentum is:
$$A)\;kg\;m^{-1}s^{-1}\\B)\;kg\;m^{-2}s^{-1}\\C)\;N\;m\\D)\;kg\;m\;s^{-1}$$
Correct option is (d)
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4) The rate of change of momentum of free falling body is equal to its:
A) momentum
B) velocity
C) weight
D) size
Correct option is (c)
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5) Change in momentum of a body is equal to:
A) (force) (velocity)
B) (force) (time)
C) (mass) (time)
D) force
Correct option is (b)
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6) A book of mass 5 kg is placed on the table, the magnitude of net force acting on the book is:
A) 50 N
B) 5 N
C) 25 N
D) 10 N
Correct option is (a)
If they means the force of gravity correct option is 50 N due to w=mg. But net force will be zero.
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7) Thrust force is a consequence of which law of motion:
A) First
B) Second
C) Third
D) Fourth
Correct option is (c)
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8) A force acts on a body for 2 seconds and its produces 50 kg m/s change in its momentum. The force acting on the body is:
A) 100 N
B) 50 N
C) 25 N
D) 2 N
Correct option is (c)
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9) At the fairground, the force that balances your weight is:
A) gravitational force
B) centripetal force
C) electrostatic force
D) frictional force
Correct option is (b)
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10) When a hanging carpet is beaten by stick. Dust flies off the carpet. It is mainly due to:
A) Action force on carpet
B) Reaction force by carpet
C) Inertia of dust
D) Rate of change of momentum of carpet
Correct option is (c)
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11) A bucket having some water is revolved in vertical circle. Water does not spill out, even the bucket is upside down, due to:
A) Weight of water
B) Centrifugal force on water
C) Inertia of water
D) Action and Reaction balance each other
Correct option is (c)
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12) The force which moves the car is:
A) Force developed by engine
B) Force of friction between road and tyre
C) Weight of car
D) Water spilt on the road
Correct option is (b)
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13)
$$N\;kg^{-1}$$ is equivalent to:
$$A)\;m\;s^{-1}\\B)\;m\;s^{-2}\\C)\;kg\;m\;s^{-1}\\D)\;kg\;s^{-2}$$
Correct option is (b)
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14) An object of mass 1 kg placed at earth’s surface experiences a force of:
A) 1 N
B) 9.8 N
C) 100 N
D) any value
Correct option is (b)
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15) Net force on the body falling in air with uniform velocity is equal to ____.
A) Weight of the body
B) air resistance on the body
C) difference of weight of body and air resistance on it
D) zero
Correct option is (d)
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