Question # 1

A lift is moving up with acceleration equal to 1/5 of that due to gravity. The apparent weight of a 60 kg man standing in lift is

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60 kg wt

72 kg wt

48 kg wt

Zero

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

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4.2 m

8.4 m

12.6 m

none of these

Acceleration of a body at any particular instant during its motion is known as

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average acceleration

uniform acceleration

instantaneous acceleration

all of them

The direction of velocity is along the direction of

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distance

displacement

acceleration

all of them

If speed of electron is 5 x 10⁵m/s. How long does it take one electron to transverse 1 m?

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1 x 10⁶

2 x 10⁶

2 x 10⁵

1 x 10⁵

Body which falls freely under gravity provides good example of motion under:

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Uniform acceleration

Non-uniform acceleration

Uniform velocity

None of these

If the velocity of the body decreases non-uniformly then the slope of the velocity-time graph will have

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different values

same values

zero valves

constant valves

The path (or trajectory) described by a projectile is

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a parabola

a hyperbola

a circle

a straight line

An object thrown upward with an initial velocity at certain angle with the horizontal and moving freely under the action of gravity is called

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a rocket

an aeroplane

a projectile

a ballon

Newton's first law is also called:

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Law of torque

Law of force

Law of inertia

None of these

Blomass includes:

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Crop residue

Natural vegetation

Animal dung

All of these

Slope of velocity time graph represents:

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Acceleration

Speed

Torque

Work

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

Root out the conventional source of energy:

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Energy from blomass

hydroelectric energy

Geothermal energy

None of these

The expression F x t is called impulse if the time 't' is

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zero

very large

very small

infinite

Maximum height of a bullet when fixed at 30 with horizontal is 11 m. Then height when it is fired at 60° is

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22 m

6 m

33 m

7.8 m

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