ECAT Pre Computer Science Chapter 5 MCQ Test With Answer

MCQ's Test For ECAT Physics Chapter 5 Circular Motion

Try The MCQ's Test For ECAT Physics Chapter 5 Circular Motion

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ECAT Physics Chapter 5 Circular Motion

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Question # 1

The rear wheels of an automobile are rotating with an angular velocity of 14 rev/sec which is reduced to 38 rad/sec in 5 second when brakes are applied. Its angular acceleration is:

Question # 2

Centripetal acceleration is also called ______ acceleration

Question # 3

One radian is:

Question # 4

One radian is:

Question # 5

When a body moves with a constant speed in a circle:

Question # 6

Direction of motion ______ in circular motion:

Question # 7

When a body moves along a circular path with constant speed, it has an acceleration, which is always directed

Question # 8

The net force acting on a 100 kg man standing in an elevator accelerating downward with a = 9.8 m sec-2comes out to be

Question # 9

Formula for calculating moment of inertia of the bodies of one pair is same. Tick the answer.

Question # 10

In case of planets, the necessary acceleration is provided by:

Question # 11

Einstein's theory about gravity if better than Newton's because it gave explanation of:

Question # 12

The useful unit of the angular displacement in SI unit is:

Question # 13

A point on the rim of a wheel moves 0.2 m when the wheel turns through an angle of 14.3 degrees. The radius of the wheel is

Question # 14

One radian is equal to:

Question # 15

______ plays the same role during angular motion as played by the mass in linear motion

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ECAT Physics Chapter 5 Important MCQ's

Sr.# Question Answer
1 A rotating body tends to be slower, when its angular acceleration is:
A. Positive
B. Negative
C. Zero
D. Infinity
2 A flywheel accelerates from rest to an angular velocity of 7 rad/sec in 7 seconds. Its average acceleration will be:
A. 49 rad/sec2
B. 1 rad/sec2
C. 0.16 rev/sec2
D. Both A and C
3 A car is moves around a circular track of radius 0.3 m at the rate of 120 rev/min. The speed v of the car is:
A. 38 m/sec
B. 3.8 m/sec
C. 0.6 m/sec
D. None of these
4 A stone is tied to the end of a 20 cm along string is whirled in a horizontal circle.
if centripetal acceleration is 9.8 m/sec2, then its angular velocity in rad/sec is:
A. 22/7
B. 7
C. 14
D. 21
5 One radian is:
A. Greater than one degree
B. Less than one degree
C. Equal to one degree
D. None of them
6 A rotating wheel accelerates up to the value of 0.75 rev/sec2after 2 seconds of its start. Its angular velocity becomes:
A. 9.42 rad/sec
B. 2.6 rev/sec
C. 1.5 rev/sec
D. Both A and C
7 One radian is:
A. Greater than one degree
B. Less than one degree
C. Equal to one degree
D. None of these
8 Satellites are held in orbits around Earth by its:
A. Gravitational field
B. Magnetic field
C. Own orbital motion
D. Own spin motion
9 A car is turning around a corner at 10 m/sec as it travels along an arc of a circle. If value of centripetal acceleration is 10 m/sec2in this case, find radius of the circular path:
A. 1 m
B. 5 m
C. 10 m
D. 15 m
10 A 1000 Kg car travelling with a speed of 90 km/hr turns around a curve of radius 0.1 km. The necessary centripetal force comes out to be:
A. 8.1 X 107N
B. 625 N
C. 6250 N
D. None of these

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