Question # 1

The horizontal component of a projectile moving with initial velocity of 500 ms^-1at an angle 60° to x-axis is

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500 ms^-1

1000 ms^-1

250 ms^-1

Zero

The range of projectile is 50 m whenθ is inclined with horizontal at 15°. What is the range whenθ becomes 45°?

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400 m

300 m

200 m

100 m

The dimension of linear inertia is:

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MLT²

ML°T^-2

ML°T°

MLT^-1

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

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zero

very large

very small

infinite

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

In above figures, tell which set of graphs shows that a body is moving with uniform velocity:

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(i) and (ii)

(ii) and (iii)

(iii) and (iv)

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

The product of force and time is called change in:

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Momentum

Impulse

Force

Both a and b

When a bicycle is in motion, the frictional forces exerted by the ground are

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In the forward direction on both the wheels

In the backward direction on both the wheels

In the forward direction on the front wheel and the backward direction on the rear wheel

In the backward direction on the front wheel and the forward direction on the rear wheel

Swimming is based on the principle of

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Newton's 1st law

Newton's 2nd law

Newton's 3rd law

All

Inertia mass and gravitational mass are

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opposite

identical

identical when there is no friction

all of them

Linear momentum is a

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fixed quantity

constant quantity

scalar quantity

vector quantity

Blomass includes:

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Crop residue

Natural vegetation

Animal dung

All of these

The decrease in velocity per unit time is called:

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Variable Acceleration

Average Acceleration

Retardation

None of these

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

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

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

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