[{"id":155258,"question":"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:","choices":[{"text":"5 rad/sec<sup>2</sup>","value":"A"},{"text":"-10 rev/sec<sup>2</sup>","value":"B"},{"text":"-10 rad/sec<sup>2</sup>","value":"C"},{"text":"-5 rev/sec<sup>2</sup>","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":155256,"question":"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:","choices":[{"text":"38 m/sec","value":"A"},{"text":"3.8 m/sec","value":"B"},{"text":"0.6 m/sec","value":"C"},{"text":"None of these","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":155255,"question":"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/sec<sup>2</sup>, then its angular velocity is rad/sec is:","choices":[{"text":"22/7","value":"A"},{"text":"7","value":"B"},{"text":"14","value":"C"},{"text":"21","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":155254,"question":"Centripetal force performs:","choices":[{"text":"Maximum work","value":"A"},{"text":"Negative work","value":"B"},{"text":"Positive work","value":"C"},{"text":"None of these","value":"D"},{"value":"E"}],"correctAnswer":4},{"id":155253,"question":"A rotating body tends to be slower, when its angular acceleration is:","choices":[{"text":"Positive","value":"A"},{"text":"Negative","value":"B"},{"text":"Zero","value":"C"},{"text":"Infinity","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":155251,"question":"When body moves along a circular path with constant speed, it has an acceleration, which is always directed;","choices":[{"text":"Along the tangent","value":"A"},{"text":"Towards the centre","value":"B"},{"text":"Away from the centre","value":"C"},{"text":"None of them","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":155249,"question":"One radian is equal to:","choices":[{"text":"30.3°","value":"A"},{"text":"45.3°","value":"B"},{"text":"50.3°","value":"C"},{"text":"57.3°","value":"D"},{"value":"E"}],"correctAnswer":4},{"id":155247,"question":"When angular acceleration is positive, the body rotates:","choices":[{"text":"Slower","value":"A"},{"text":"Slowest","value":"B"},{"text":"Faster","value":"C"},{"text":"None of these","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":155246,"question":"One radian is:","choices":[{"text":"Greater than one degree","value":"A"},{"text":"Less than one degree","value":"B"},{"text":"Equal to one degree","value":"C"},{"text":"None of these","value":"D"},{"value":"E"}],"correctAnswer":1},{"id":155244,"question":"Centripetal acceleration is also called ______ acceleration:","choices":[{"text":"Tangential","value":"A"},{"text":"Radial","value":"B"},{"text":"Angular","value":"C"},{"text":"None of them","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":155243,"question":"Direction of motion ______ in circular motion:","choices":[{"text":"Changes off and on","value":"A"},{"text":"Changes continuously","value":"B"},{"text":"Does not change","value":"C"},{"text":"None of them","value":"D"},{"value":"E"}],"correctAnswer":4},{"id":155239,"question":"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:","choices":[{"text":"0.05 m","value":"A"},{"text":"0.08 m","value":"B"},{"text":"0.8 m","value":"C"},{"text":"0.008 m","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":153912,"question":"Angular velocity is a:","choices":[{"text":"Scalar quantity","value":"A"},{"text":"Vector quantity","value":"B"},{"text":"Complex quantity","value":"C"},{"text":"None of these","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":153910,"question":"In rotational motion, analogue of force F us called:","choices":[{"text":"Couple","value":"A"},{"text":"Torque","value":"B"},{"text":"Mass","value":"C"},{"text":"Moment of intertia","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":153907,"question":"The useful unit of angular replacement in SI unit is:","choices":[{"text":"Degree","value":"A"},{"text":"Revolution","value":"B"},{"text":"Radian","value":"C"},{"text":"Metre","value":"D"},{"value":"E"}],"correctAnswer":3}]