Question # 1

Velocity of a body changes if

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direction of the body changes

speed of the body changes

neither speed nor direction changes

either speed or direction changes

The short distance between two points direction from its initial point to final point is called:

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Velocity

Displacement

Speed

Distance

Slope of velocity time graph represents:

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Acceleration

Speed

Torque

Work

Rocket engines lift a rocket from the earth surface, because hot gas with high velocity

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Push against the air

React against the rocket and push it up

Heat up the air which lifts the rocket

Push against the earth

The path described by a projectile is called its

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orbit

trajectory

range

distance

A ball is thrown upwards with a velocity of 100 m/s. It will reach the ground after

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10 s

20 s

5 s

40 s

Ethanol (alcohol) as a type of:

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Electric fuel

Bio fuel

Nuclear fuel

None of these

When body moves with increasing acceleration, its velocity time graph is a

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straight line

horizontal straight line

vertical straight line

curve

Tick the conservative force:

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tension in a string

Air resistance

Elastic spring force

Frictional force

A body moving with uniform velocity has

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positive acceleration

negative acceleration

infinite acceleration

zero acceleration

The dimension of linear inertia is:

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MLT²

ML°T^-2

ML°T°

MLT^-1

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

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Increases

Decreases

Remains same

None of these

Unit of impulse in

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Newton

Kg m

Kg m/s

Joule

In the expression F x t, the force F is

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total force

instantaneous force

average force

all of them

A dirty carpet is to be cleaned by heating. This is in according with______law of motion.

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First

Second

Third

None of these

The second law gives the relationship between

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mass and velocity

force and acceleration

velocity and acceleration

mass and weight

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

Find the total displacement of a body in 8 seconds starting from rest with an acceleration of 20 cm/s²

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0.064 m

640 cm

64 cm

64 m

Dimensions of velocity are

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[L]

[T]

[LT^-1]

[LT^-2]

A man sitting in a bus travelling in a direction from west to east with a speed of 40 km/h observes that the rain drops are falling vertically down. To the another man standing on ground the rain will appear

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To fall vertically down

To fall at an angle going from west to east

To fall at an angle going from east to west

The information given is insufficient to decide the direction of rain

A change in position of a body from its initial position to its final position is known as

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relative motion

displacement

distance

acceleration

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

Earth is considered to be

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a non-inertial frame

an inertial frame

an accelerated frame

none of the above

A boat of mass 40 kg is at rest, A dog of mass 4 kg moves in the boat with a velocity of 10 m/s. What is the velocity of boat?

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4 m/s

2 m/s

8 m/s

1 m/s

In the above figures, tell which set is graphs shows that a body is moving uniform velocity:

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(i) and (ii)

(ii) and (iii)

(i) and (iii)

(ii) and (iv)

Which quantity has the same dimension as that of impulse?

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KE

Power

Momentum

Work

Newton's first law is also called:

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Law of torque

Law of force

Law of inertia

None of these

If the acceleration of a body is not uniform, then velocity-time graph will be:

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Curve

Straight line

Sphere

All of these

The direction of the acceleration is the same as that of

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speed

velocity

both of them

none of them

A man fires a bullet of mass 200 g at a speed of 5 m/s. The gun is of one kg mass. By what velocity the gun rebounds backwards?

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0.1 m/s

10 m/s

1 m/s

0.01 m/s

In above figures, tell which set of graphs shows that a body is moving with uniform velocity:

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(i) and (ii)

(ii) and (iii)

(iii) and (iv)

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