ECAT Physics Chapter 5 Circular Motion Online Test With Answers

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ECAT Physics Chapter 5 Circular Motion Online Test

Sr. # Questions Answers Choice
1 Radian is defined as the angle subtended at the center of a circle by an arc of: Length equal to its diameter Length equal to its radius Any length None of these
2 A body moving along the circumference of a circle of radius R completes one revolution. The radius of the covered path to the angle subtended at the center is: Radius of the circle Twice the radius Thrice the radius None of these
3 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
4 A car is turning around a corner at 10 m/sec as it travels along an arc of 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
5 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: 8.1 X 10<sup>7</sup>N 625 N 6250 N None of these
6 A rotating wheel accelerates up to the value of 0.75 rev/sec2after 2 seconds of its start. Its angular velocity becomes: 9.42 rad/sec 2.6 rev/sec 1.5 rev/sec Both A and C
7 The rear wheels of an automobile are rev/sec which is reduced to 38 rad/sec in 5 seconds when brakes are applied. Its angular acceleration is: 5 rad/sec<sup>2</sup> -10 rav/sec<sup>2</sup> -10 rad/sec<sup>2</sup> -5 rav/sec<sup>2</sup>
8 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: 38 m/sec 3.8 m/sec 0.6 m/sec None of these
9 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:
 22/7 7 14 21
10 One radian is equal to: 30.3<span style="font-size: 10.5pt; line-height: 107%; font-family: Arial, sans-serif; background-image: initial; background-position: initial; background-size: initial; background-repeat: initial; background-attachment: initial; background-origin: initial; background-clip: initial;">°</span> 45.3<span style="font-size: 10.5pt; line-height: 107%; font-family: Arial, sans-serif; background-image: initial; background-position: initial; background-size: initial; background-repeat: initial; background-attachment: initial; background-origin: initial; background-clip: initial;">°</span> 50.3<span style="font-size: 10.5pt; line-height: 107%; font-family: Arial, sans-serif; background-image: initial; background-position: initial; background-size: initial; background-repeat: initial; background-attachment: initial; background-origin: initial; background-clip: initial;">°</span> 57.3<span style="font-size: 10.5pt; line-height: 107%; font-family: Arial, sans-serif; background-image: initial; background-position: initial; background-size: initial; background-repeat: initial; background-attachment: initial; background-origin: initial; background-clip: initial;">°</span>
11 When a body is moves along a circular path with constant speed, it has an acceleration, which is always directed: Along the tangent Toward the centre Away from the centre None of them
12 One radian is: Greater than one degree Less than one degree Equal to one degree None of them
13 Centripetal acceleration is also called _______ acceleration: Tangential Radial Angular None of them
14 Direction of motion_______ in circular of motion: Changes off and on Changes continuously Does not change None of them
15 Conventionally the angular velocity is directed to an angle of: 90<span style="font-size: 10.5pt; line-height: 107%; font-family: Arial, sans-serif; background-image: initial; background-position: initial; background-size: initial; background-repeat: initial; background-attachment: initial; background-origin: initial; background-clip: initial;">° to the axis of rotation</span> 30<span style="font-size: 10.5pt; line-height: 107%; font-family: Arial, sans-serif; background-image: initial; background-position: initial; background-size: initial; background-repeat: initial; background-attachment: initial; background-origin: initial; background-clip: initial;">° to the axis of rotation</span> 0<span style="font-size: 10.5pt; line-height: 107%; font-family: Arial, sans-serif; background-image: initial; background-position: initial; background-size: initial; background-repeat: initial; background-attachment: initial; background-origin: initial; background-clip: initial;">° to the axis of rotation</span> None of the above
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