ECAT Pre General Science Physics Chapter 3 MCQ Test With Answer

MCQ's Test For ECAT Pre General Science Physics Chapter 3 Motion and Force

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ECAT Pre General Science Physics Chapter 3 Motion and Force

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Question # 1

The direction of the acceleration is the same as that of

Question # 2

During the upward motion of the projectile, the vertical component of velocity.

Question # 3

According to the law of conservation of linear momentum, the total linear momentum of an isolated system

Question # 4

The velocity given to a body to go out of the influence of earth's gravity is known as:

Question # 5

Unit of impulse in

Question # 6

The dimension of linear inertia is:

Question # 7

Swimming is based on the principle of

Question # 8

A typical rocket ejects the burnt gases at speeds over

Question # 9

Force is a:

Question # 10

A body of weight 1 N has a kinetic energy of 1 joule when its speed is:

Question # 11

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

Question # 12

The decrease in velocity per unit time is called:

Question # 13

A mass of 5kg moves with an acceleration of 10m s-2force applied is

Question # 14

The distance covered by a body in unit time is called.

Question # 15

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

Question # 16

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

Question # 17

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

Question # 18

An airplane is flying horizontally with a velocity of 600 km/h and at a height of 1960 m. When it is vertically above a point A on the ground, a bomb is released from it. The bomb strikes the ground, at point B. The distance AB is

Question # 19

If rope of lift breaks suddenly. The tension exerted by the surface of lift is (a=Acceleration of lift)

Question # 20

A projectile on its path gets divided into two pieces at its highest point. Which is true?

Question # 21

The projectile motion is composed of

Question # 22

Which one of the following is dimensionless:

Question # 23

Graphs which are used to illustrate the variation of velocity of an object with time are called

Question # 24

A ball is dropped from a height of 4.2 meters. To what height will take it rise if there is no loss of KE after rebounding?

Question # 25

A body whose momentum is constant must have constant

Question # 26

If two bodies of equal masses moving in the same direction collide elastically, then their velocities.

Question # 27

A body is dropped from a tower with zero velocity, reaches ground in 4s. The height of the tower is about

Question # 28

The vertical and horizontal range will be equal id angle of projection is

Question # 29

When a body is moving on a surface, the force of friction is called

Question # 30

A certain force gives an acceleration of 2 m/sec2to a body mass 5 kg. The same force would give a 20 kg object an acceleration of:

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ECAT Physics Chapter 3 Important MCQ's

Sr.# Question Answer
1 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?
A. 4 m/s
B. 2 m/s
C. 8 m/s
D. 1 m/s
2 An object thrown upward with an initial velocity at certain angle with the horizontal and moving freely under the action of gravity is called
A. a rocket
B. an aeroplane
C. a projectile
D. a ballon
3 Find the total displacement of a body in 8 seconds starting from rest with an acceleration of 20 cm/s2
A. 0.064 m
B. 640 cm
C. 64 cm
D. 64 m
4 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:
A. 10 NS
B. 100 NS
C. 140 NS
D. 200 NS
5 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:
A. 0.5 m/sec2
B. 5 m/sec2
C. 1.5 m/sec2
D. 9.8 m/sec2
6 If a train traveling at 72 kmph is to be brought to rest in a distance of 200 meters then its retardation should be
A. 20 ms-2
B. 10 ms-2
C. 2 ms-2
D. 1 ms-2
7 An airplane is flying horizontally with a velocity of 600 km/h and at a height of 1960 m. When it is vertically above a point A on the ground, a bomb is released from it. The bomb strikes the ground, at point B. The distance AB is
A. 1200 m
B. 0.33 km
C. 3.33 km
D. 33 km
8 Dimensions of velocity are
A. [L]
B. [T]
C. [LT-1]
D. [LT-2]
9 When a bicycle is in motion but not pedaled, the force of friction exerted by the ground on the two wheels is such that it acts
A. In the backward direction on the front wheel and in the forward direction on the rear wheel
B. In the forwards directions on the front wheel and in the backward direction on the rear wheel
C. In the forward direction on both the wheels
D. In the backward direction on both the wheels
10 When a person jumps off the ground, the reaction force of the ground is
A. greater than the weight of the person
B. smaller than the weight of the person
C. equal to the weight of the person
D. zero

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