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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8. A car is moving in horizontal circular track of radius 10 m, with a constant speed of 36 km/hour. A simple pendulum is suspended from the roof of the car. If the length of the simple pendulum is 1 m, what is the angle made by the string with the track

30° 45° 60° 90°

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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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