14.A mixture is formed by adding 200g of liquid P at 120C and 100g of liquid Q at 75C. The temperature of mixture becomes 90C. If a new mixture is formed by adding 100 g of liquid P at 100C and 50g of liquid Q at 70C, the temperature will be: (C) 85 C (D) 60 C (A) 70 C (B) 80 C 15.During an experiment, a perfect monoatomic gas is found to obey an additional law VP = constant. The gas is initially at some temperature T, volume V and pressure P. (where V = 5cm and P = 4 cm of Hg). When gas is compressed to half its initial volume, mean kinetic energy of molecule becomes 5.44 10-17 ergs. Find total number of molecules of gas. (Given g = 980 cm/s, density of mercury = 13.6 g/cm, 1erg = 10-7]) (A) 7.35 1020 (B) 1.47 1022 (C) 7.35 1021 x (D) 2.94 x 1020 16.A ball is in equilibrium in a mixture of oil and water, as shown in the diagram below. If density of oil relative to water is 1/3, and density of ball relative to water is 2/3, then the percentage volume of ball submerged inside water is: Ball oil water (A) 33.33% (B) 25% (C) 75% (D) 50%