Physics ECAT Pre Engineering Chapter 5 Circular Motion Online Test With Answers

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Physics ECAT Pre Engineering Chapter 5 Circular Motion Online Test

Sr. # Questions Answers Choice
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: 5 rad/sec<sup>2</sup> -10 rev/sec<sup>2</sup> -10 rad/sec<sup>2</sup> -5 rev/sec<sup>2</sup>
2 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
3 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
4 Centripetal force performs: Maximum work Negative work Positive work None of these
5 A rotating body tends to be slower, when its angular acceleration is: Positive Negative Zero Infinity
6 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
7 One radian is equal to: 30.3° 45.3° 50.3° 57.3°
8 When angular acceleration is positive, the body rotates: Slower Slowest Faster None of these
9 One radian is: Greater than one degree Less than one degree Equal to one degree None of these
10 Centripetal acceleration is also called ______ acceleration: Tangential Radial Angular None of them
11 Direction of motion ______ in circular motion: Changes off and on Changes continuously Does not change None of them
12 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
13 Angular velocity is a: Scalar quantity Vector quantity Complex quantity None of these
14 In rotational motion, analogue of force F us called: Couple Torque Mass Moment of intertia
15 The useful unit of angular replacement in SI unit is: Degree Revolution Radian Metre
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