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Thermodynamics (Physics)

AIPMT 2004MCQEasy📈 Topic in 38% papers+4−1
Ques. 1AIPMT 2004

One mole of an ideal gas at an initial temperature of T K does 6R joule 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

  1. (T + 2.4) K
  2. (T - 2.4) K
  3. (T + 4) K
  4. (T - 4) K

Answer

(4) (T - 4) K

Solution

For an adiabatic process the work done by the gas is W = nR(T1 - T2) - 1, so

6R = 1 R(T - T2) 53 - 1 = 32R(T - T2)

T - T2 = 4

The gas cools as it does work, hence

T2 = (T - 4) K

Answer: (4)

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Ques. 2AIPMT 2003

An ideal gas heat engine operates in a Carnot cycle between 227 C and 127 C. It absorbs 6 kcal at the higher temperature. The amount of heat (in kcal) converted into work is equal to

  1. 4.8
  2. 3.5
  3. 1.6
  4. 1.2
Ques. 3AIPMT 2002

The efficiency of Carnot engine is 50\% and temperature of sink is 500 K. If temperature of source is kept constant and its efficiency raised to 60\%, then the required temperature of sink will be

  1. 100 K
  2. 600 K
  3. 400 K
  4. 500 K
Ques. 4AIPMT 2001

A scientist says that the efficiency of his heat engine which works at source temperature 127 and sink temperature 27 is 26\%, then

  1. it is impossible
  2. it is possible but less probable
  3. it is quite probable
  4. data are incomplete.
Ques. 5AIPMT 2000

The (W/Q) of a Carnot engine is 16, now the temperature of sink is reduced by 62 , then this ratio becomes twice, therefore the initial temperature of the sink and source are respectively

  1. 33 , 67
  2. 37 , 99
  3. 67 , 33
  4. 97 K, 37 K

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