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

Which of the following four statements is false?

Question # 2

Blomass includes:

Question # 3

The motion of a projectile is

Question # 4

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

Question # 5

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

Question # 6

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

Question # 7

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

Question # 8

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

Question # 9

Bodies failing freely under gravity provide good example of motion under

Question # 10

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

Question # 11

A train cover 90 km in half an hour. the time taken by it to travel 15 km will be:

Question # 12

A body of mass 5 kg is acted upon by a total change n momentum will be:

Question # 13

For a given angle of projection, if the time of flight of a projectile is doubled, the horizontal range will increases to

Question # 14

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

Question # 15

Rate of change of momentum is called

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Sr.# Question Answer
1 Dimensions of velocity are
A. [L]
B. [T]
C. [LT-1]
D. [LT-2]
2 A vehicle of mass 120 kg is moving with a uniform velocity of 108 km/h. The force required to stop the vehicle in 10s is
A. 120 x 10.8 N
B. 180 N
C. 720 N
D. 360 N
3 A monkey sits on the pan of spring scale kept in an elevator. The reading of the spring scale will be maximum when
A. Elevator is stationary
B. Elevator cable breaks and it falls freely towards earth
C. Elevator accelerates downwards
D. Elevator accelerates upward
4 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
5 Acceleration of a body is negative if the velocity of the body is
A. constant
B. increasing
C. decreasing
D. none of them
6 In equation F=ma, then mass 'm' is
A. rest mass
B. variable mass
C. inertial mass
D. gravitational mass
7 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
A. 6 s
B. 36 s
C. 38 s
D. None of these
8 The direction of velocity is along the direction of
A. distance
B. displacement
C. acceleration
D. all of them
9 A body is moving with constant velocity of 10 m/sec in the north-east direction. Then its acceleration will be:
A. 10 m/sec2
B. 20 m/sec2
C. 30 m/sec2
D. Zero
10 Which quantity has the same dimension as that of impulse?
A. KE
B. Power
C. Momentum
D. Work
11 For maximum linear distance of travel, a projectile must be fired at an angle of
A. 0°
B. 45°
C. 90°
D. 60°
12 When a shall explodes a mid-air, the total momentum of its fragments is
A. less than the momentum of shell
B. equal to the momentum of shell
C. greater than the momentum of shell
D. none of them
13 A body walks to his school at a distance of 6 km with a speed of 2.5 km/h and walks back with a constant speed of 5 km/h. His average speed for round trip expressed in km/h is
A. 24/13
B. 10/3
C. 3
D. 4,8
14 Which one of the following is dimensionless:
A. Acceleration
B. Velocity
C. Density
D. Angle
15 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

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