# UPSC Physics

1. A body is moving along a circular path with variable speed. It has

a radial acceleration | a tangential acceleration | zero acceleration | both tangential and radial accelerations |

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2. A body is traveling in a circle at constant speed. It

has constant velocity. | has no acceleration | has an inward acceleration | has an outward radial acceleration |

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3. A body of mass 500 gram is rotating in a vertical circle of radius 1 m. What is the difference in its kinetic energies at the top and the bottom of the circle

4.9 J | 19.8 J | 2.8 J | 9.8 J |

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4. A bucket containing water is tied to one end of a rope of length 2.5 m and rotated about the other end in a vertical circle. What should be the minimum velocity of the bucket at the highest point, so that the water in the bucket will not spill? (g = 10 m/s2)

2.5 m/s | 4 m/s | 5 m/s | 7 m/s |

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5. A bucket tied at the end of a 1.6 m long string is whirled in a vertical circle with a constant speed. What should be the minimum speed so that the water from the bucket does not spill when the bucket is at the highest position

4 m/sec. | 6.25 m/sec. | 16 m/se | None of these |

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6. A can filled with water is revolved in a vertical circle of radius 4 metre and the water does not fall down. The time period of revolution will be

1 sec | 10 sec | 8 sec | 4 sec |

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7. A car is moving in a circular track of radius 10 metre with a constant speed of 10 m/sec. A plumb bob is suspended from the roof of the car by a light rigid rod of 1 metre long. The angle made by the rod with the track is

zero | 30° | 45° | 60° |

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9. A car is moving on a circular path and takes a turn. If R1 and R2 are the reactions on the inner and outer wheels respectively, then

R1 = R2 | R1 < R2 | R1 > R2 | R1 ≥ R2 |

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10. A car is moving with a speed of 30 m/s on a circular path of radius 500 m. Its speed is increasing at the rate of 2 m/s2. The acceleration of the car is

9.8 m/s2 | 1.8 m/2 | 2 m/s2 | 2.7 m/s2 |

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