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 change in position of a body from its initial position to its final position is known as

Question # 2

A body falls freely from rest. It covers as much distance in the last second of its motion as covered in the first three seconds. The body has fallen for a time of

Question # 3

The area under line velocity-time graph is numerically equal to the

Question # 4

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

Question # 5

If a train traveling at 72 kmph is to be brought to rest in a distance of 200 meters then its retardation should be

Question # 6

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

Question # 7

Acceleration of a body is negative if the velocity of the body is

Question # 8

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 # 9

The dimension of linear inertia is:

Question # 10

Acceleration in a body is always produced in the direction of :

Question # 11

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

Question # 12

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

Question # 13

The projectile motion is composed of

Question # 14

A railway engine (mass 104kg) is moving with a speed of 73 km/h. The force which should be applied to bring it to rest over a distance of 20 m is

Question # 15

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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Sr.# Question Answer
1 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
2 The shortest distance between two points directed from its initial point to final point is called:
A. Velocity
B. Displacement
C. Speed
D. Distance
3 Which one of the following is dimensionless:
A. Acceleration
B. Velocity
C. Density
D. Angle
4 A typical rocket consumes about
A. 100 kg s-1of fuel
B. 1000 kg s-1of fuel
C. 10000 kg s-1of fuel
D. 100000 kg s-1of fuel
5 Dimensions of velocity are
A. [L]
B. [T]
C. [LT-1]
D. [LT-2]
6 The dimension of linear inertia is:
A. MLT2
B. ML0T-2
C. ML0T0
D. MLT-1
7 When the mass of the colliding body is much larger than the mass of the body at rest, its velocity after collision.
A. Becomes half
B. Becomes zero
C. Ramains same
D. Becomes double
8 If the velocity of the body decreases non-uniformly then the slope of the velocity-time graph will have
A. different values
B. same values
C. zero valves
D. constant valves
9 A body is thrown from a height h with speed u, it hits the ground with speed V
A. The value of V is maximum if the body is thrown vertically downward
B. The value of V is maximum if the body is thrown vertically upwards
C. The value of V is minimum if the body is thrown horizontally
D. The value of V does not depend on the direction of which it is thrown
10 Which one of the following is dimensionless.
A. Acceleration
B. Velocity
C. Density
D. Angle
11 Blomass includes:
A. Crop residue
B. Natural vegetation
C. Animal dung
D. All of these
12 A typical rocket ejects the burnt gases at speeds over
A. 400 ms-1
B. 40000m s-1
C. 40000 ms-1
D. 60000 ms-1
13 Acceleration of a body at any particular instant during its motion is known as
A. average acceleration
B. uniform acceleration
C. instantaneous acceleration
D. all of them
14 In above figures, tell which set of graphs shows that a body is moving with uniform velocity:
A. (i) and (ii)
B. (ii) and (iii)
C. (iii) and (iv)
15 A particle of mass 0.5 g moving along x-axis is located of x1= 15 m at t1= 5s and x2= 33 m at t2= 13s its average velocity is
A. 6 m s-1
B. 2.45 m s-1
C. 2.25 m s-1
D. 4.45 m s-1

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