ECAT Pre Computer Science Chapter 3 MCQ Test With Answer

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

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ECAT 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

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

Question # 3

The horizontal range of projectile, at a certain place, depends upon

Question # 4

Newton's laws are adequate for speeds that are

Question # 5

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:

Question # 6

A ball is dropped from a certain height and another ball is projected horizontally from the same point. Which of the following statement is correct?

Question # 7

Which one of the following is dimensionless:

Question # 8

Find the total displacement of a body in 8 seconds starting from rest with an acceleration of 20 cm/s2

Question # 9

A man fires a bullet of mass 200 g at a speed of 5 m/s. The gun is of one kg mass. By what velocity the gun rebounds backwards?

Question # 10

A body whose momentum is constant must have constant

Question # 11

If the slope of the velocity-time graph increases at constant rate with time, then the body is said to have

Question # 12

A ball is thrown upwards with a velocity of 100 m/s. It will reach the ground after

Question # 13

A dirty carpet is to be cleaned by heating. This is an accordance with____ law of motion:

Question # 14

Two projectiles are fired from the same point with the same speed at angles of projection 60° and 30° respectively. Which one of the following is true?

Question # 15

Force is a:

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Sr.# Question Answer
1 The velocity of a projectile is maximum
A. at the point of projection
B. just before striking the ground
C. at none of them
D. at both of them
2 The mass of a body measured by a physical balance in a lift at rest is found to be m, if the lift is going up with an acceleration a, its mass will be measured as
A. m (1 - a/g)
B. m (1 + a/g)
C. m
D. Zero
3 When a force is applied on a body, several effects are possible Which of the following effect could not occur?
A. the body rotates
B. the body speeds up
C. the mass of the body decreases
D. the body changes its direction
4 Acceleration of a body is negative if the velocity of the body is
A. constant
B. increasing
C. decreasing
D. none of them
5 When a bicycle is in motion, the frictional forces exerted by the ground are
A. In the forward direction on both the wheels
B. In the backward direction on both the wheels
C. In the forward direction on the front wheel and the backward direction on the rear wheel
D. In the backward direction on the front wheel and the forward direction on the rear wheel
6 The linear momentum of the body is defined as
A. p=ma
B. p=1/2ma
C. p=mv
D. p=1/2mv
7 If the velocity time graph is a straight line parallel to time-axis, then it means that:
A. The body is moving with uniform velocity
B. The body is moving with uniform acceleration
C. The body is at rest
D. None of above
8 For maximum linear distance of travel, a projectile must be fired at an angle of
A. 0°
B. 45°
C. 90°
D. 60°
9 Flight of rocket in the space is an example of
A. Newton's first law
B. Newton's third law
C. Newton's second law
D. all of them
10 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
11 Acceleration in a body is always produced in the direction of :
A. Velocity
B. Weight
C. Force
D. Both B and C
12 The direction of the acceleration is the same as that of
A. speed
B. velocity
C. both of them
D. none of them
13 A motorist travels A to B at a speed at 40 km/h and returns at speed of 60km/h. His average speed will be
A. 40 km/h
B. 48 km/h
C. 50 km/h
D. 60 km/h
14 Tick the conservation force:
A. Tension in a string
B. Air resistance string
C. Elastic spring force
D. Frictional force
15 A stone is dropped from rest from the top of a tower 19.6 m high. The distance traveled during the last second of its fall is (giving g=9.8 m/ss)
A. 9.8 m
B. 14.7 m
C. 4.9 m
D. 19.6 m

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