Question # 1

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

When we consider the average velocity of a body, then the body is moving in

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straight line

curved path

may be in a straight or curved path

none of them

For a moving body, at any instant of time

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If the body is not moving the acceleration is necessarily zero

If the body is slowing, the retardation is negative

If the body is slowing, the distance is negative

If displacement, velocity and acceleration at that instant are known, we can find the displacement at any given time in future

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

One newton is a force that produces an acceleration of 0.5 m/sec²in a body of mass:

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2 Kg

3 Kg

4 Kg

8 Kg

A certain force gives an acceleration of 2 m/sec2 to a body if mass 5 kg. The same force would give a 29 kg object an acceleration of:

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0.5 m/sec2

5 m/sec2

1.5 m/sec2

9.8 m/sec2

The projectile motion is composed of

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horizontal motion only

vertical motion only

horizontal and vertical motion

none of them

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

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30°

45°

60°

75°

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 dimension of linear inertia is:

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MLT²

ML⁰T^-2

ML⁰T⁰

MLT^-1

The direction of velocity is along the direction of

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distance

displacement

acceleration

all of them

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

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

Root out the conventional source of energy:

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Energy from blomass

hydroelectric energy

Geothermal energy

None of these

A body whose momentum is constant must have constant

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Acceleration

Velocity

Force

None of these

When a force is applied on a body, several effects are possible Which of the following effect could not occur?

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the body rotates

the body speeds up

the mass of the body decreases

the body changes its direction

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

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