Question # 1

In the expression F x t, the force F is

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total force

instantaneous force

average force

all of them

The path described by a projectile is called its

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orbit

trajectory

range

distance

A ball is dropped downwards After 1 second another ball is dropped downwards from the same point. What is the distance between them after 3 seconds

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25 m

20 m

50 m

9.8 m

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

A rocket carries its own fuel in the form of

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liquid only

liquid or solid

liquid and solid

liquid or solid and oxygen

During the upward motion of the projectile, the vertical component of velocity:

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Decreases

Increases

Remains constant

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

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

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The maximum

The minimum

Zero

g

The velocity of a body at any instant of its motion is known as

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average velocity

instantaneous velocity

uniform velocity

none of them

The time rate of change of displacement is called:

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Time

Acceleration

Speed

Velocity

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 area under line velocity-time graph is numerically equal to the

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speed of the body

acceleration of the body

distance covered by the body

none of them

Swimming becomes possible because of______law of motion:

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First

Second

Third

None of these

The direction of the linear momentum is the direction of

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speed

velocity

weight

none of them

A stone is dropped from rest from the top of a tower 19.6 m high. The distance traveled during the last second of its fall is (giving g=9.8 m/s^s)

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9.8 m

14.7 m

4.9 m

19.6 m

A cold soft drink is kept on the balance. When the cap is opened, then the weight

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Increases

Decreases

First increases, then decreases

Remains same

The magnitude of the force producing an acceleration of 10 m/sec²in a body of mass 500 grams is:

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3 N

4 N

5 N

6 N

During the projectile motion, the horizontal component of velocity

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changes with time

remains constant

becomes zero

decreases with time

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

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30°

45°

60°

75°

Root out the conventional source of energy:

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Energy from blomass

hydroelectric energy

Geothermal energy

None of these

Velocity is a

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scalar quantity

vector quantity

constant quantity

none of them

Swimming becomes possible because of______law of motion.

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First

Second

Third

None of these

Which quantity has the same dimension as that of impulse?

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KE

Power

Momentum

Work

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

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Increases

Decreases

Remains same

None of these

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

Acceleration produced in a body by the force varies

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inversely as the applied force

directly as the applied force

directly as the mass of the body

none of them

Swimming is based on the principle of

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Newton's 1st law

Newton's 2nd law

Newton's 3rd law

All

What must be changing when a body is accelerating uniformly?

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the force acting on a body

the velocity of the body

the mass of the body

the speed of the body

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

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

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

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