Question # 1

A body walks to his school at a distance of 6 km with a speed of 2.5 km/h and walks back with a constant speed of 5 km/h. His average speed for round trip expressed in km/h is

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24/13

10/3

3

4,8

Bodies 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

A 120 m long train is moving in a direction with speed 20 m/s. A train B moving with 30 m/s in the opposite direction and 130 m long crosses the first train in a time

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6 s

36 s

38 s

None of these

Essential characteristic of equilibrium is

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Momentum equal to zero

Acceleration equal to zero

Kinetic energy equal to zero

Velocity equal to zero

The vertical and horizontal range will be equal id angle of projection is

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76°

45°

60°

120°

Biomass includes:

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Crop residue

Natural vegetation

Animal dung

All of these

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

The slopes of the tangent at any point on the curve gives the value of the

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average velocity at that point

instantaneous velocity at that point

average acceleration at that point

instantaneous acceleration at that point

A body moving with an acceleration of 5 m/sec²started with velocity of 10 m/sec. What will be the distance traversed in 10 seconds?

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150 m

250 m

350 m

400 m

When a bicycle is in motion but not pedaled, the force of friction exerted by the ground on the two wheels is such that it acts

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

In the forwards directions on the front wheel and in the backward direction on the rear wheel

In the forward direction on both the wheels

In the backward direction on both the wheels

A typical rocket consumes about

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100 kg s^-1of fuel

1000 kg s^-1of fuel

10000 kg s^-1of fuel

100000 kg s^-1of fuel

Inertia mass and gravitational mass are

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opposite

identical

identical when there is no friction

all of them

Linear momentum is a

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fixed quantity

constant quantity

scalar quantity

vector quantity

The entity which measures the quantity of motion in a body is called

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force

energy

momentum

power

If the velocity time graph is a straight line parallel to the time-axis, then it means:

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The body is moving with uniform velocity

The body is moving with uniform acceleration

The body is at rest

None of these

When brakes are applied to a fast moving car, the passengers will be thrown:

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Forward

Backward

Downward

None of these

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

If the velocity time graph is a straight line parallel to time-axis, then it means that:

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The body is moving with uniform velocity

The body is moving with uniform acceleration

The body is at rest

None of above

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

The direction of velocity is along the direction of

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distance

displacement

acceleration

all of them

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

Root out of the conventional source of energy:

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Energy from biomass

Hydroelectric energy

Geothermal energy

None of these

The artillery shells travel along parabolic paths under the influence of

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magnetic field

electric field

electromagnetic field

gravitational field

A lift is descending at a constant speed V. A passenger in the lift drops a coin. The acceleration of the coin towards the floor will be

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Zero

g

-g

V + g

The motion in a plane is the motion in

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one dimension

two dimension

three dimension

four dimension

A vehicle of mass 120 kg is moving with a uniform velocity of 108 km/h. The force required to stop the vehicle in 10s is

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120 x 10.8 N

180 N

720 N

360 N

Graphs which are used to illustrate the variation of velocity of an object with time are called

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distance time graphs

speed time graphs

velocity time graphs

acceleration time graphs

Change in momentum is one second called.

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Impulse

Force

Energy

Work

The path (or trajectory) described by a projectile is

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a parabola

a hyperbola

a circle

a straight line

A ball falls on the surface from 10 m height and rebounds to 2.5 m. if the duration of contact with the floor is 0.01 seconds then the average acceleration during contact is

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2100 m/s²

1400 m/s²

700 m/s²

400 m/s²

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

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