23 The ratio of modulus of rigidity to bulk modulus for a Poisson s ratio of 0 15 would be 1 1 4 2 21 23 3 25 6 4 17 6 24 Two soap bubbles of radil equal to 6 cm and 8 cm are touching each other over a common surface Radius of the common surface will be 1 3 42 cm 2 4 cm 3 24 cm 4 10 cm One mole of an ideal gas at an initial temperature of T K does 15R joules of work adiabatically If the ratio of specific heats of this gas at constant pressure and at constant volume is 5 3 the final temperature of gas will be 25 1 T 2 4 K 2 T 10 K 4 T 10 K 3 T 4 K 26 One mole of an ideal monatomic gas is taken from A to C along the path ABC The temperature of the gas at A is To For the process ABC 2P Po AP To C B Vo 2V 1 Work done by the gas is RTO 2 Change in internal energy of the gas is 11RTO 2 3C 40 5C 3 Heat absorbed by the gas is 21RTd 2 4 Heat absorbed by the gas is 13RTo 2 27 The temperature of sink of Carnot engine is 27 C and Efficiency of engine is 60 Then temperature of source is 1 227 C 2 477 C 4 27 C 3 127 C 28 Three large plates A B and C are placed parallel to each other and charges are given as shown The charge that appears on the left surface of plate B is 1 5 C 3 3 C 4 3 C 29 The lengths of the three wires of copper are in the ratio of 1 4 8 and their masses are in the ratio of 5 3 1 The ratio of their electrical resistance is 1 1 3 5 3 1 25 125 30 In the circuit shown the current through 8 is same before and after connecting E The value of Eis 32 1 12 V 3 4 V 60 www 3 CE CE2 HH 2 6 V 4 2 V 31 In the given circuit diagram when the current reaches steady state in the circuit the charge on the capacitor of capacitance C will be 52 4 4 12 4 S 12 V 822 ww E 1 36 V 36 2 72 V 30 2 3 90 V 36 4 72 V 36 0 2 3 80 960 4 125 15 1 www 12 www 7 ww 10 22 2 CE www 2 5 r 4 CE 12 4 In the series combination of 18 cells each cell having emf 6 V and internal resistance 2 ohm if three cells are wrongly connected i e their polarity is opposite to remaining 15 cells then total emf and internal resistance of this combination will be