ECAT Pre General Science Physics Chapter 5 Circular Motion With Answers

ECAT Pre General Science Physics Chapter 5 Circular Motion

Sr. # Questions Answers Choice
1 Moment of linear momentum is called. Moment arm Moment of inertia Inertia Angular momentum
2 Formula for calculating moment of inertia of the bodies of one pair is same. Tick the answer. Disc, sphere sphere, hoop Thin rod, hoop Hoop,disc
3 Final velocity of a hoop is __________ the final velocity of a disc having same mass and radius on coming down an inclined plane. Greater than smaller than Equal to None of these
4 In case of planets, the necessary acceleration is provided by: Gravitational force Coulomb force Frictional force None of these
5 A body can have constant velocity when it follows: A circular path A rectilinear path Trajectory of a projectile None of these
6 The instantaneous acceleration of a body moving with constant speed in a circle: Remains constant Is called centripetal acceleration Tangential acceleration None of these
7 When a body moves with a constant speed in a circle: No work is done on it No acceleration is produced in the body Velocity remains constant None of these
8 When an object moves with a uniform angular velocity, then its instantaneous angular velocity is equal to: Zero Its average velocity Its angular displacement None of these
9 The angular speed of a particle moving along a circular path is 5 Pie rad sec-1, Its period of motion is: 2.5 sec 0.06 sec 15.7 sec 0.4 sec
10 Angular velocity is a: Scalar quantity Vector quantity Complex quantity None of these
11 Circular motion is an example of motion in: One dimension Two dimensions Three dimensions None of these
12 The useful unit of the angular displacement in SI unit is: Degree Revolution Radian Metre
13 A body moving along the circumference of a circle of radius R completes one revolution. The radius of a covered path to the angle subtended at the centre is: Radius of the circle Twice the radius Thrice the radius None of these
14 A flywheel accelerates from rest to an angular velocity of 7 rad/sec in 7 seconds. Its average acceleration will be: 49 rad/sec<sup>2</sup> 1 rad/sec<sup>2</sup> 0.16 rev/sec<sup>2</sup> Both A and C Both B and C
15 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: 1 m 5 m 10 m 15 m
16 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: 5 rad/sec<sup>2</sup> -10 rev/sec<sup>2</sup> -10 rad/sec<sup>2</sup> -5 rev/sec<sup>2</sup>
17 A toy car moves around a circular track of radius 0.3 m at the rate of 120 rev/min. The speed V of the car is: 38 m/sec 3.8 m/sec 0.6 m/sec None of these
18 A stone tied to the end of a 20 cm long string is whirled in a horizontal circle. If centripetal acceleration is 9.8 m/sec2, then its angular velocity is rad/sec is: 22/7 7 14 21
19 Centripetal force performs: Maximum work Negative work Positive work None of these
20 A rotating body tends to be slower, when its angular acceleration is: Positive Negative Zero Infinity
21 When body moves along a circular path with constant speed, it has an acceleration, which is always directed; Along the tangent Towards the centre Away from the centre None of them
22 One radian is equal to: 30.3° 45.3° 50.3° 57.3°
23 When angular acceleration is positive, the body rotates: Slower Slowest Faster None of these
24 One radian is: Greater than one degree Less than one degree Equal to one degree None of these
25 Centripetal acceleration is also called ______ acceleration: Tangential Radial Angular None of them
26 Direction of motion ______ in circular motion: Changes off and on Changes continuously Does not change None of them
27 A point on the rim of a wheel moves 0.2 m where the wheel turns through an angle is 14.3 degrees. The radius of the wheel is: 0.05 m 0.08 m 0.8 m 0.008 m
28 Angular velocity is a: Scalar quantity Vector quantity Complex quantity None of these
29 In rotational motion, analogue of force F us called: Couple Torque Mass Moment of intertia
30 The useful unit of angular replacement in SI unit is: Degree Revolution Radian Metre
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