### Polytechnic 2013 Physics Question Paper with Answers

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61]. While measuring the diameter of a lead shot using a screw gauge, the reading on the pitch scale is found to be 7.5mm and that on the head scale is 48. If the least count is 0.01mm, and the zero error is + 0.05 mm, find the diameter of the lead shot.

1) 7.5 mm 2) 7.93 mm 3) 7.98 mm 4) 8.03 mm

**Answer is : 2**

62]. What will be the time period of the satellite to complete one revolution towards the earth?

The radius of the earth is 6400Km; g is 10 m/sec2

1) 5030.5 Sec 2) 5028.5 sec 3) 5025.5 sec 4) 5023.5 Sec

**Answer is : 2**

63]. A 100Kg object is kept at a height of 1/4th of its radius then its weight will be

1) 25Kg 2) 50Kg 3) 100Kg 4) 200Kg

**Answer is : 2**

64]. The relationship between s, u, a and t is

1) S = ut + at2 2) 2s = Ut + ½ at2

3) S = Ut + ½ at2 4) S = ½ Ut + at2

**Answer is : 3**

65]. The maximum height reached by a body travelling with initial velocity of 9.8 m/sec

1) 39.2m 2) 19.6m 3) 9.8 m 4) 4.9m

**Answer is : 4**

66]. A stone is projected up with a velocity ‘u’ and at the same time, another is dropped from

a height ‘2u’. The time required for them to meet in air is

1) 5 sec 2) 3 sec 3) 2 sec 4) 1sec

**Answer is : 3**

67]. Time period of the pendulum is 1.2 sec. then find the length of the pendulum

1) 35.2 cm 2) 35.6cm 3) 35cm 4) 35.7 cm

**Answer is : 4**

68]. The quantity which is constant in uniform circular motion is

1) Speed 2) speed and direction

3) direction 4) none

**Answer is : 1**

69]. A bucket full of water is whirled in a vertical circle. The water does not come out from the bucket. This is due to

1) Weight is more than centripetal force

2) Centripetal force, weight are equal

3) Centrifugal force, Weight are equal

4) Weight is more than centrifugal force

**Answer is : 3**

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