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1. When an ideal diatomic gas is heated at constant pressure, the fraction of the heat energy supplied which increases the internal energy of the gas, is

(a) 2/5 (b) 3/5 (c) 3/7 …

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25. In a capillary tube, water rises by 1.2 mm. The height of water that will rise in another capillary tube having half the radius of the first, is

(a) 1.2 mm (b) 2.4 mm (c) 0.6 mm (d) 0.4 mm Ans. b (4)

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20. Force necessary to pull a circular plate of 5 cm radius from water surface for which surface tension is 75 dynes/cm, is

(a) 30 dynes (b) 60 dynes (c) 750 dynes (d) 750 π dynes Ans. d (37)

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123. The speed of a homogeneous solid sphere after rolling down an inclined plane of vertical height h, from rest without sliding, is

(a) √(10/7 gh) (b) √(gh) (c) √(6/5 gh) (d) √(4/3 gh) Ans. a (7)

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