Question # 1

A ball is dropped from a certain height and another ball is projected horizontally from the same point. Which of the following statement is correct?

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Both hit the ground at the same veloctiy

Both hit the ground at the same speed

The change of velocity during the path for both balls is the same

The change of speed during the path for both balls is the same

A railway engine (mass 10⁴kg) is moving with a speed of 73 km/h. The force which should be applied to bring it to rest over a distance of 20 m is

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3,600 N

7,200 N

10,000 N

100,000 N

A ball is dropped from a height of 4.2 meters. To what height it will rise if there is no loss of KE after rebounding?

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4.2 m

8.4

12.6

None of these

The velocity given to a body to go out of the influence of earth's gravity is known as:

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Terminal velocity

Orbital velocity

Escape velocity

None of these

Change in momentum is one second is called:

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Impulse

Force

Energy

Work

A mass of 5kg moves with an acceleration of 10m s^-2force applied is

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10N

50N

2N

20N

When a person jumps off the ground, the reaction force of the ground is

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greater than the weight of the person

smaller than the weight of the person

equal to the weight of the person

zero

The motion of a body in a straight line is the motion in

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one dimension

two dimension

three dimension

four dimension

If an iron ball and a wooden ball of the same radius was released from a height 'h' in vacuum, then time taken by both of them to reach ground will be

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Unequal

Exactly equal

Roughly equal

Zero

When a horse pulls a cart, the force that makes the horse run forward is the force exerted by

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The horse on the ground

The horse on the cart

The ground on the horse

The ground on the cart

Newton published laws of motion in his famous book "principia" in

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1867

1667

1676

1687

When a force is applied on a body, several effects are possible Which of the following effect could not occur?

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the body rotates

the body speeds up

the mass of the body decreases

the body changes its direction

A 5 kg mass is falling freely, the force acting on, it will be

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19.6 N

9.8 N

5 N

Zero

A train of 150 m length is going towards north direction at a speed of 10 ms^-1. A parrot files at a speed of 5 ms^-1towards south direction parallel to the railway track. The time taken by the parrot to cross the train is equal to

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12 s

8 s

15 s

10 s

If the instantaneous velocity of a body does not change. the body is said to be moving with

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average velocity

uniform velocity

instantaneous velocity

variable velocity

A monkey sits on the pan of spring scale kept in an elevator. The reading of the spring scale will be maximum when

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Elevator is stationary

Elevator cable breaks and it falls freely towards earth

Elevator accelerates downwards

Elevator accelerates upward

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