11%20-%20Heat%20and%20Thermodynamics

11%20-%20Heat%20and%20Thermodynamics - 11 - HEAT AND...

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11 - HEAT AND THERMODYNAMICS Page 1 ( including ideal gas and kinetic theory of gases ) ( Answers at the end of all questions ) 1 ) Which of the following is incorrect regarding the first law of thermodynamics ? ( a ) It is the restatement of the principle of conservation of energy. ( b ) It is not applicable to any cyclic process. ( c ) It introduces the concept of entropy. ( d ) It introduces the concept of the internal energy. [ AIEEE 2005 ] 2 ) A system goes from A to B via two processes Ι and ΙΙ as shown in figure. If U 1 and U 2 are the changes in internal energies in the processes Ι and ΙΙ respectively, then ( a ) relation between U 1 and U 2 cannot be determined ( b ) U 1 = U 2 ( c ) U 2 < U 1 ( d ) U 2 > U 1 [ AIEEE 2005 ] 3 ) The temperature – entropy diagram of a reversible engine cycle is given in the figure. Its efficiency is ( a ) 1 / 4 ( b ) 1 / 2 ( c ) 2 / 3 ( d ) 1 / 3 [ AIEEE 2005 ] 4 ) A gaseous mixture consists of 16 g of Helium and 16 g of oxygen. The ratio C p / C v of the mixture is ( a ) 1.62 ( b ) 1.59 ( c ) 1.54 ( d ) 1.4 [ AIEEE 2005 ] 5 ) Which of the following statements is correct for any thermodynamic system ? ( a ) The internal energy changes in all processes. ( b ) Internal energy and entropy are state functions. ( c ) The change in entropy can never be zero. ( d ) The work done in an adiabatic process is always zero. [ AIEEE 2004 ] 6 ) One mole of ideal monatomic gas ( γ = 5 / 3 ) is mixed with one mole of diatomic gas ( γ = 7 / 5 ). What is γ for the mixture ? ( a ) 3 / 2 ( b ) 23 / 15 ( c ) 35 / 23 ( d ) 4 / 3 [ AIEEE 2004 ] 7 ) Two thermally insulated vessels 1 and 2 are filled with air at temperature ( T 1 , T 2 ), volume ( V 1 , V 2 ) and pressure ( P 1 , P 2 ) respectively. If the valve joining the two vessels is opened, the temperature inside he vessel at equilibrium will be ( a ) T 1 + T 2 ( b ) 2 T T 2 1 + ( c ) 1 2 2 2 1 1 2 2 1 1 2 1 T V P T V P ) V P V P ( T T + + ( d ) 2 T V P T V P ) V P V P ( T T 2 2 1 1 1 2 2 1 1 2 1 + + [ AIEEE 2004 ]
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11 - HEAT AND THERMODYNAMICS Page 2 ( including ideal gas and kinetic theory of gases ) ( Answers at the end of all questions ) 8 ) “Heat cannot by itself flow from a body at lower temperature to a body at higher temperature” is a statement as a consequence of ( a ) conservation of mass ( b ) conservation of momentum ( c ) first law of thermodynamics ( d ) second law of thermodynamics [ AIEEE 2003 ] 9 ) During an adiabatic process, the pressure of a gas is found to be proportional to the cube of its absolute temperature. The ratio C p / C v for the gas is ( a ) 2 ( b ) 3 / 2 ( c ) 4 / 3 ( d ) 5 / 3 [ AIEEE 2003 ] 10 ) A Carnot engine takes 3 × 10 6 cal. of heat from a reservoir at 627 ° C and gives it to a sink at 27 ° C. The work done by the engine is ( a ) zero ( b ) 4.2 × 10 6 J ( c ) 8.4 × 10 6 J ( d ) 16.8 × 10 6 J [ AIEEE 2003 ] 11 ) Which of the following parameters does not characterize the thermodynamic
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11%20-%20Heat%20and%20Thermodynamics - 11 - HEAT AND...

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