MCQ Forces and Laws of Motion | NCERT Class 9

#1. A two-third (2/3) filled water tank is moving with uniform speed. On applying brake, water in the tank

a) rise upwards

b) remains unaffected

c) move backwards

d) move forwards

#2. A passenger in amoving 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

#3. 1. Which is correct - the inertia of an object tends to

a) decrease its speed

b) increase its speed

c) decelerate due to friction

d) resist any change in its state of motion

#4. According to the third law of motion, action & reaction

a) always act on same body

b) always act on different bodies in opposite direction

c) have same magnitude & directions

d) act on either body at normal to each other

#5. An object of mass 2 kg is sliding with constant velocity of 4 m/s on a frictionless horizontal table. The force required to keep the object moving with same velocity is

a) 32 N

b) 0 N

c) 2 N

d) 8 N

#6. A batsman hits a cricket ball which then rolls on a level ground. The ball comes to rest after covering some distance. The ball stops because

a) the batsman did not hit the ball hard enough

b) velocity is proportional to the force exerted on the ball

c) there is a force on the ball opposing the motion

d) there is no unbalanced force on the ball, so the ball would want to come to rest

#7. A goalkeeper in a game of football pulls his hands backwards after holding the ball shot at the goal. This enables the goal keeper to

a) exert larger force on the ball

b) increase the rate of change of momentum

c) decrease the rate of change of momentum

d) reduce the force exerted by the ball on hands

#8. What is the momentum of an object of mass moving with velocity v

a) (mv)^2

b) mv

c) ½ mv^2

d) mv^2

#9. Rocket works on the principle of conservation of

a) momentum

b) mass

c) velocity

d) energy

#10. Which is not correct for an object moving with accelerated motion along a straight line

a) its speed keeps changing

b) it always goes away from the Earth

c) a force is always acting on it

d) its velocity always changes

Finish

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