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Which of the following statement is not correct for an object moving along a straight path in an accelerated motion?

A force is always acting on itIt always goes away from the earthIts velocity always changesIts speed keeps changing

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According to the third law of motion, action and reaction

act on either body at normal to each otherhave same magnitude and directionsalways act on different bodies in opposite directionsalways act on the same body

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

decrease the rate of change of momentumincrease the rate of change of momentumreduce the force exerted by the ball on handsexert larger force on the ball

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The inertia of an object tends to cause the object

to decelerate due to frictionto resist any change in its state of motionto decrease its speedto increase its speed

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

along circular tracksretardeduniformaccelerated

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An object of mass 2 kg is sliding with a constant velocity of 4 m s–1 on a frictionless horizontal table. The force required to keep the object moving with the same velocity is

8 N2 N0 N32 N

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Rocket works on the principle of conservation of

velocitymomentumenergymass

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A water tanker 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

rise upwardsbe unaffectedmove forwardmove backward

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There are three solids made up of aluminum, steel and wood, of the same shape and same volume. Which of them would have highest inertia?

All of these will have same inertiaWoodSteelAluminum

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Two balls of the same size but of different materials, rubber and iron, are kept on the smooth floor of a moving train. The brakes are applied suddenly to stop the train. Will the balls start rolling? If so, in which direction? Will they move with the same speed?

Yes, the balls will roll backward, but with different speeds.Yes, the balls will roll backward with the same speed.Yes, the balls will roll forward with the same speed.No, the balls will remain stationary.

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Two identical bullets are fired, one by a light rifle and another by a heavy rifle, with the same force. Which rifle will hurt the shoulder more?

Neither rifle will hurt the shoulder.Both rifles will hurt the shoulder equally.The heavy rifle will hurt the shoulder more.The light rifle will hurt the shoulder more.