Question # 1

Which of the following four statements is false?

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A body can have zero velocity and still be accelerated

A body can have a constant velocity and still have a varying speed

A body can have a constant speed and still have a varying velocity

The direction of the velocity of a body can change when its acceleration is constant

Suppose the water flows out from a pipe at 3kg s^-1and its velocity changes from 5m s^-1to zero on striking the wall, then the force exerted by water on wall will be

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5 N

10 N

15 N

20 N

Tick the conservative force:

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tension in a string

Air resistance

Elastic spring force

Frictional force

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

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Increases

Decreases

Remains same

None of these

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

An object is dropped from a height of 100 m. Its velocity at the moment it touches the ground is:

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100 m/sec

140 m/sec

1960 m/sec

196 m/sec

If the values of instantaneous and average velocities are equal, the body is said to be moving with

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uniform acceleration

uniform speed

variable velocity

uniform velocity

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

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Velocity

Weight

Force

Both B and C

A body is moving with constant velocity of 10 m/sec in the north-east direction. Then its acceleration will be:

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10 m/sec²

20 m/sec²

30 m/sec²

Zero

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

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

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zero

very large

very small

infinite

The consumption source if energy is:

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Energy from blomass

Hydroelectric energy

Geothermal energy

None of these

Root out the conventional source of energy:

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Energy from blomass

hydroelectric energy

Geothermal energy

None of these

The path described by a projectile is called its

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orbit

trajectory

range

distance

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 horizontal range of projectile, at a certain place, depends upon

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the mass of the projectile

velocity of projection

angle of projection

angle as well as velocity of projection

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ECAT Physics Chapter 3 Motion and Force Online Test MCQs With Answers

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