Thermodynamics

91. Superheated vapour behaves

1. exactly as gas
2. as steam
3. as ordinary vapour
4. approximately as a gas
5. as average of gas and vapour.

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92. Temperature of a gas is produced due to

1. its heating value
2. kinetic energy of molecules
3. repulsion of molecules
4. attraction of molecules
5. surface tension of molecules.

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93. The basis for measuring thermodynamic property of temperature is given by

1. zeroth law of thermodynamics
2. first law of thermodynamics
3. second law of thermodynamics
4. third law of thermodynamics
5. Avogadro's hypothesis.

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94. The behaviour of gases can be fully determined by

1. 1 law
2. 2 laws
3. 3 laws
4. 4 laws
5. None

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95. The condition of perfect vacuum, i.e., absolute zero pressure can be attained at

1. a temperature of - 273.16°C
2. a temperature of 0°C
3. a temperature of 273 °K
4. a negative pressure and 0°C temperature
5. can't be attained.

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96. The cycle in which heat is supplied at constant volume and rejected at constant pressure is known as

1. Dual combustion cycle
2. Diesel cycle
3. Atkinson cycle
4. Rankine cycle
5. Stirling cycle.

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97. The door of a running refrigerator inside a room was left open. Which of the following statements is correct?

1. The room will be cooled to the temperature inside the refrigerator.
2. The room will be cooled very slightly.
3. The room will be gradually warmed up.
4. The temperature of the air in room will remain unaffected.
5. any one of above is possible depending on the capacity.

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98. The efficiency of a Carnot engine depends on

1. working substance
2. design of engine
3. size of engine
4. type of fuel fired
5. temperatures of source and sink.

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99. The efficiency of Carnot cycle is maximum for

1. gas engine
2. well lubricated engine
3. petrol engine
4. steam engine
5. reversible engine.

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100. The efficiency of Diesei cycle with decrease in cut off

1. increases
2. decreases
3. remains unaffected
4. first increases and then decreases
5. first decreases and then increases.

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