MCQ Questions for Class 9 Science Chapter 9 Force and Laws Motion with Answers

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(a) m/s
(b) kg.m/s
(c) kg.m/s2
(d) N m2/kg2

## Q2.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) A force is always acting on it

## Q3.A water tank filled up to 2/3 of its height is moving with a uniform speed. On sudden application of the brake, the water in the tank would

(a) Move backwards
(b) Move forward
(c) Come to the rest
(e) Be unaffected

## Q4.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 the same magnitude and directions
(d) act on either body at normal to each other

Answer: (b) always act on different bodies in opposite directions

## Q5. The seat belts are provided in the cars so that if the car stops suddenly due to an emergency braking, the persons sitting on the front seats are not thrown forward violently and are saved from getting injured. Can you guess the law due to which a person falls in the forward direction on the sudden stopping of the car?

(a) Newton’s first law of motion
(b) Newton’s second law of motion
(c) Newton’s third law of motion
(d) Newton’s law of gravitation

Answer:(a) Newton’s first law of motion

## Q6.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) decrease the rate of change in momentum

## Q7.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) to resist any change in its state of motion

## Q8.A passenger in a moving train tosses a coin which falls behind him. It means that the motion of the train is

(a) accelerated
(b) uniform
(c) retarded
(d) along circular tracks

## Q9.The speed of a car weighing 1500 kg increases from 36 km/h to 72 km/h uniformly. What will be the change in momentum of the car?

(a) 15000 kg km/h
(b) 15000 kg m/s
(c) 54000 kg m/s
(d) 54000 g m/s

(a) 32 N
(b) 0 N
(c) 2 N
(d) 8 N

(a) mass
(b) energy
(c) momentum
(d) velocity

## Q12.A water tanker filled up to 23 of its height is moving at a uniform speed. On a sudden application of brakes, the water in the tank would

(a) move backwards
(b) move forward
(c) be unaffected
(d) rise upwards

## Q13.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.

## Q14. A passenger in a moving train tosses a coin which falls behind him. Observing this statement what can you say about the motion of the train?

(a) Accelerated
(b) Retarded
(c) Along circular tracks
(d) Uniform

## Q15.When several 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

(a) balanced forces
(b) equal forces
(c) unbalanced forces
(d) opposite forces

## Q16.When a car at high speed makes a sharp turn, the driver in a car tends to get thrown to the side opposite the turn. This is due to the

(a) inertia of motion
(b) inertia of time
(c) inertia of rest
(d) inertia of direction

## Q17.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) move away from the shore

## Q18. When a balloon held between the hands is pressed, its shape changes. This happens because:

(a) Balanced forces act on the balloon
(b) Unbalanced forces act on the balloon
(c) Frictional forces act on the balloon
(d) Gravitational force acts on the balloon

Answer:(a) Balanced forces act on the balloon

## Q19.Which of the following is an incorrect statement?

(a) Mass is a measure of the 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) Unbalanced force produces constant velocity.

## Q20.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
(d) fall on the left of the thrower