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

A ball falls on the surface from 10 m height and rebounds to 2.5 m. if the duration of contact with the floor is 0.01 seconds then the average acceleration during contact is

Question # 2

Distance covered by a freely failing body n the first second of its motion will be:

Question # 3

The linear momentum of the body is defined as

Question # 4

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

Question # 5

If a ball comes back to its starting point after bouncing off the wall several times, then its

Question # 6

When the surfaces are coated with a lubricant, then they

Question # 7

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)

Question # 8

A monkey sits on the pan of spring scale kept in an elevator. The reading of the spring scale will be maximum when

Question # 9

The direction of the linear momentum is the direction of

Question # 10

Body which falls freely under gravity provides good example of motion under:

Question # 11

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

Question # 12

The velocity of a body at any instant of its motion is known as

Question # 13

A train is moving with a velocity of 25 m/s and a car is moving behind it by a velocity of 8 m/s in same direction. The relative velocity of train with respect to car is

Question # 14

A car travels first half distance between two places with a speed of 30 km/h and remaining half with a speed of 50 km/h. The average speed of the car is

Question # 15

The SI units of momentum is

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Sr.# Question Answer
1 The slopes of the tangent at any point on the curve gives the value of the
A. average velocity at that point
B. instantaneous velocity at that point
C. average acceleration at that point
D. instantaneous acceleration at that point
2 If d is the displacement of the body in time t, then its average velocity will be
A. Vav= d x t
B. Vav = t/d
C. Vav = d/t
D. Vav = d/t
3 When the surfaces are coated with a lubricant, then they
A. Stick to each other
B. Slide upon each other
C. Roll upon each other
D. None of these
4 Velocity is a
A. scalar quantity
B. vector quantity
C. constant quantity
D. none of them
5 A cold soft drink is kept on the balance. When the cap is opened, then the weight
A. Increases
B. Decreases
C. First increases, then decreases
D. Remains same
6 Acceleration in a body is always produced in the directin of:
A. Velocity
B. Weight
C. Force
D. Botha B and C
7 The three equation of motions are useful only for
A. linear motion with increasing acceleration
B. line motion with uniform acceleration
C. linear motion with zero acceleration
D. linear motion with varying acceleration
8 Change in momentum is one second is called:
A. Impulse
B. Force
C. Energy
D. Work
9 In equation F=ma, then mass 'm' is
A. rest mass
B. variable mass
C. inertial mass
D. gravitational mass
10 A body of weight 1 N has a kinetic energy of 1 joule when its speed is:
A. 1.46 m sec-1
B. 2.44 m sec-1
C. 3.42 m sec-1
D. 4.43 m sec-1
11 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
12 A body of mass 1.0 kg is falling with an acceleration of 10 m/s2. Its apparent weight will be (g=10 m/s2)
A. 1.0 kg wt
B. 2.0 kg wt
C. 0.5 kg wt
D. Zero
13 If an iron ball and a wooden ball of the same radius was released from a height 'h' in vacuum, then time taken by both of them to reach ground will be
A. Unequal
B. Exactly equal
C. Roughly equal
D. Zero
14 Newton's laws are adequate for speeds that are
A. low compared with the speed of light
B. equal to the speed of light
C. greater than the speed of light
D. all of them
15 Newton published laws of motion in his famous book "principia" in
A. 1867
B. 1667
C. 1676
D. 1687

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