Question # 1

Acceleration produced in a body by a 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

A typical rocket consumes about

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100 kg s^-1of fuel

1000 kg s^-1of fuel

10000 kg s^-1of fuel

100000 kg s^-1of fuel

A body of mass 5 kg is acted upon by a constant force of 20 n for 7 seconds. The total change in momentum will be:

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10 NS

100 NS

140 NS

200 NS

Unit of impulse in

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Newton

Kg m

Kg m/s

Joule

What will be the ratio of the distance moved by a freely falling body from rest in 4th and 5th seconds of journey?

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4 : 5

7 : 9

16 : 25

1 : 1

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

Slope of velocity time graph represents:

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Acceleration

Speed

Torque

Work

If speed of electron is 5 x 10⁵m/s. How long does it take one electron to transverse 1 m?

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1 x 10⁶

2 x 10⁶

2 x 10⁵

1 x 10⁵

Work done along a closed path in a gravitational field is:

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Maximum

Minimum

Zero

Unity

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

A non-inertial frame of reference is that frame of reference in which

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a = 0

a > 0 or a < 0

v = 0

none of them

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

A body is thrown from a height h with speed u, it hits the ground with speed V

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The value of V is maximum if the body is thrown vertically downward

The value of V is maximum if the body is thrown vertically upwards

The value of V is minimum if the body is thrown horizontally

The value of V does not depend on the direction of which it is thrown

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

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

If the velocity time graph is a straight line parallel to the time-axis, then it means:

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The body is moving with uniform velocity

The body is moving with uniform acceleration

The body is at rest

None of these

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

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