ECAT Pre General Science Physics Chapter 5 Circular Motion Online Test With Answers

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ECAT Pre General Science 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
16 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: 0.05 m 0.08 m 0.8 m 0.008 m
17 Einstein's theory about gravity if better than Newton's because it gave explanation of: Inverse square law Bending of light Both A and B None of above
18 INTELSAT operates at frequencies 4, 6, 11, 14 having unit of: KHz MHz GHz BHz
19 The number of "Earth stations" which transmit signals to satellites and receive signals from them are: 3 24 126 200
20 The net force acting on a 100 kg man standing in an elevator accelerating downward with a = 0.8 m sec-2comes out to: 980 N 580 N 1380 N Zero
21 If a gymnast is sitting on a rotating stool with his arms outstretched, brings his arms towards the chest, then its angular velocity will: Increase Decrease Remains constant None of these
22 Conventional the angular Velocity is Directed at an angle of: <font face="arial, sans, sans-serif"><span style="font-size: 13.3333px;">90</span></font><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 above
23 When a 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
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 these
26 Direction of motion _______ in circular motion Changes off and on Changes continuously Does not change None of them
27 An axis of rotation Is a straight line Is normal to the plane of rotation Passes through pivot point O All of them
28 Conventionally the angular velocity is directed at an angle of 90° to the axis of rotation 30° to the axis of rotation 0° to the axis of rotation None of the above
29 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 0.05 m 0.08 cm 0.8 m 0.008 m
30 INTELSAT operates at frequencies 4, 6, 11, 14 having unit of KHz MHz GHz BHz
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