Question # 1

The product of force and time is called change in:

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Momentum

Impulse

Force

Both a and b

A train cover 90 km in half an hour. the time taken by it to travel 15 km will be:

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20 minutes

48 minutes

10 minutes

5 minutes

When the surfaces are coated with a lubricant, then they

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Stick to each other

Slide upon each other

Roll upon each other

None of these

When two protons are brought closer potential energy of both of them:

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Increases

Decreases

Remains same

None of these

In velocity of a particle at an instant is 10 m/s and after 5s the velocity of the particle is 20 m/s. The velocity 3s before in m/s is

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8

4

6

7

The velocity of a projectile is maximum

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at the point of projection

just before striking the ground

at none of them

at both of them

Acceleration of a body is negative if the velocity of the body is

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constant

increasing

decreasing

none of them

Newton's laws are adequate for speeds that are

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low compared with the speed of light

equal to the speed of light

greater than the speed of light

all of them

For maximum linear distance of travel, a projectile must be fired at an angle of

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0°

45°

90°

60°

According to the law of conservation of linear momentum, the total linear momentum of an isolated system

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increases

decreases with time

remains constant

none of them

Which one of the following is dimensionless:

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Acceleration

Velocity

Density

Angle

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 consumption source if energy is:

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Energy from blomass

Hydroelectric energy

Geothermal energy

None of these

The direction of velocity is along the direction of

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distance

displacement

acceleration

all of them

Acceleration in a body is always produced in the directin of:

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Velocity

Weight

Force

Botha B and C

If rope of lift breaks suddenly. The tension exerted by the surface of lift is (a=Acceleration of lift)

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mg

m (g+a)

m (g - a)

0

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