Question # 1

When a shall explodes a mid-air, the total momentum of its fragments is

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less than the momentum of shell

equal to the momentum of shell

greater than the momentum of shell

none of them

Dimensions of velocity are

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[L]

[T]

[LT^-1]

[LT^-2]

The time of flight of a projectile motion equal to

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half of the time to reach maximum height

twice the time to reach maximum height

one fourth of time to reach maximum height

time to reach maximum height

A car travels first half distance between two places with a speed of 30 km/h and remaining half with a speed of 50 km/h. The average speed of the car is

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37.5 km/h

10 km/h

42 km/h

40 km/h

Tick the conservation force:

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Tension in a string

Air resistance string

Elastic spring force

Frictional force

The linear momentum of the body is defined as

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p=ma

p=1/2ma

p=mv

p=1/2mv

Force is a:

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Scalar quantity

Base quantity

Derived quantity

None of these

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

The second law gives the relationship between

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mass and velocity

force and acceleration

velocity and acceleration

mass and weight

If the acceleration of a body is negative, then slope of the velocity-time graph will be:

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Zero

Positive

Negative

Infinity

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

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Increases

Decreases

Remains same

None of these

A person is sitting in a traveling train and facing the engine. He tosses up a coin and the coin falls behind him. It can be concluded that the train is

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Moving forward and gaining speed

Moving forward and losing speed

Moving forward with uniform speed

Moving backward with uniform speed

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

If a train traveling at 72 kmph is to be brought to rest in a distance of 200 meters then its retardation should be

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20 ms^-2

10 ms^-2

2 ms^-2

1 ms^-2

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

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

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Forward

Backward

Downward

None of these

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

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