Question # 1

If m means mass of gases objected per second from a rocket and v shows the change in velocity, than mv is named as:

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Force

Energy

work

impulse

Which of the following is not a projectile

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a bullet fired from a gun

a space ship

a football in air

an artillery shell

Ethanol (alcohol) as a type of:

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Electric fuel

Bio fuel

Nuclear fuel

None of these

A typical rocket ejects the burnt gases at speeds over

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400 ms^-1

40000m s^-1

40000 ms^-1

60000 ms^-1

A lift is moving up with acceleration equal to 1/5 of that due to gravity. The apparent weight of a 60 kg man standing in lift is

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60 kg wt

72 kg wt

48 kg wt

Zero

The effect of applying a force on a moving body is to change

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its direction of motion only

its speed of motion only

both the direction and speed of motion

its inertia only

A 120 m long train is moving in a direction with speed 20 m/s. A train B moving with 30 m/s in the opposite direction and 130 m long crosses the first train in a time

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6 s

36 s

38 s

None of these

The dimension of linear inertia is:

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MLT²

ML⁰T^-2

ML⁰T⁰

MLT^-1

The shortest distance between two points directed from its initial point to final point is called:

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Velocity

Displacement

Speed

Distance

Bodies failing freely under gravity provide good example of motion under

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non-uniform acceleration

uniform acceleration

variable acceleration

increasing acceleration

Biomass includes:

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Crop residue

Natural vegetation

Animal dung

All of these

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

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

The linear momentum of the body is defined as

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p=ma

p=1/2ma

p=mv

p=1/2mv

Bodies 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 collision in which KE is conserved but momentum is not conserved is called:

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Elastic collision

Inelastic collision

any these

None of these

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

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