6. The height of a mercury barometer is 75 cm at sea level and 50 cm at the top of a hill. Ratio of density of mercury to that of air is
104. The height of the hill is
(a) 250 m (b) 2.5 km
(c) 1.25 km (d) 750 m
Answer-b
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(a) – 5 J (b) – 10 J (c) – 15 J (d) – 20 J Answer-a