Question # 1

At the top of the trajectory of a projectile the acceleration is

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The maximum

The minimum

Zero

g

The product of force and time is called

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acceleration

linear momentum

angular momentum

impulse

A body is thrown from a height h with speed u, it hits the ground with speed V

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The value of V is maximum if the body is thrown vertically downward

The value of V is maximum if the body is thrown vertically upwards

The value of V is minimum if the body is thrown horizontally

The value of V does not depend on the direction of which it is thrown

Newton's first law is also called:

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Law of torque

Law of force

Law of inertia

None of these

Distance covered by a freely falling body in 2 sec will be

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4.9 m

19.6 m

29.2 m

44.1 m

Which of the following is not a projectile

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a bullet fired from a gun

a space ship

a football in air

an artillery shell

A person is sitting in a traveling train and facing the engine. He tosses up a coin and the coin falls behind him. It can be concluded that the train is

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Moving forward and gaining speed

Moving forward and losing speed

Moving forward with uniform speed

Moving backward with uniform speed

The collision in which KE is conserved but momentum is not conserved is called:

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Elastic collision

Inelastic collision

any these

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

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

Blomass includes:

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Crop residue

Natural vegetation

Animal dung

All of these

The projectile attains maximum horizontal range when it is projected at an angle of

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30°

45°

60°

75°

When a bicycle is in motion, the frictional forces exerted by the ground are

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In the forward direction on both the wheels

In the backward direction on both the wheels

In the forward direction on the front wheel and the backward direction on the rear wheel

In the backward direction on the front wheel and the forward direction on the rear wheel

If the values of instantaneous and average velocities are equal, the body is said to be moving with

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uniform acceleration

uniform speed

variable velocity

uniform velocity

Distance covered by a freely failing body n the first second of its motion will be:

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4.9 m

9.8 m

19.6 m

29.4 m

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

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