ECAT Pre Engineering Physics Chapter 3 MCQ Test With Answer

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

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Physics ECAT Pre Engineering Chapter 3 Motion and Force

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Question # 1

If the values of instantaneous and average velocities are equal, the body is said to be moving with

Question # 2

Velocity of a body changes if

Question # 3

If m means mass of gases objected per second from a rocket and v shows the change in velocity, than mv is named as:

Question # 4

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:

Question # 5

The path (or trajectory) described by a projectile is

Question # 6

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

Question # 7

When a shell explodes in mid-air, its fragments fly off in

Question # 8

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 # 9

The path described by a projectile is called its

Question # 10

Earth is considered to be

Question # 11

An object is dropped from a height of 100 m. Its velocity at the moment it touches the ground is:

Question # 12

Slope of velocity-time graph represents:

Question # 13

Inertial frame of references are those frame of references which are moving with

Question # 14

Acceleration of a body is positive, if the velocity of the body is

Question # 15

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

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ECAT Physics Chapter 3 Important MCQ's

Sr.# Question Answer
1 A body is dropped from a tower with zero velocity, reaches ground in 4s. The height of the tower is about
A. 80 m
B. 20 m
C. 160 m
D. 40 m
2 The projectile attains maximum horizontal range when it is projected at an angle of
A. 30°
B. 45°
C. 60°
D. 75°
3 Newton's first law is also called:
A. Law of torque
B. Law of force
C. Law of inertia
D. None of these
4 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?
A. 0.1 m/s
B. 10 m/s
C. 1 m/s
D. 0.01 m/s
5 A body whose momentum is constant must have constant
A. Acceleration
B. Velocity
C. Force
D. None of these
6 A force of 50 dynes is acted on a body of mass 5 g which is at rest, for an interval of 3 seconds, then impulse is
A. 0.15 x 10-3Ns
B. 0.98 x 10-3Ns
C. 1.5 x 10-3Ns
D. 2.5 x 10-3Ns
7 An aircraft is moving with a velocity of 300 ms-1. If all the forces acting on it are balanced, then
A. It still moves with the same velocity
B. It will be just floating at the same point in space
C. It will be fall down instantaneously
D. It will lose its velocity gradually
8 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?
A. 4.2 m
B. 8.4 m
C. 12.6 m
D. none of these
9 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
10 The magnitude of the force producing an acceleration of 10 m/sec2in a body of mass 500 grams is:
A. 3 N
B. 4 N
C. 5 N
D. 6 N

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