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MCQs

Total Questions : 1058 | Page 7 of 106 pages
Question 61. The change of entropy, when heat is absorbed by the gas, is
  1.     Positive
  2.     Negative
  3.     Positive or negative
  4.     None of these
 Discuss Question
Answer: Option A. ->  Positive
Question 62. Energy can neither be created nor destroyed, but it can be transformed from one form to another. this statement is known as
  1.     Zeroth law of thermodynamics
  2.     First law of thermodynamics
  3.     Second law of thermodynamics
  4.     Kinetic theory of gases
 Discuss Question
Answer: Option B. ->  First law of thermodynamics
Question 63. Superheated vapour behaves
  1.     Exactly as gas
  2.     As steam
  3.     As ordinary vapour
  4.     Approximately as a gas
 Discuss Question
Answer: Option D. ->  Approximately as a gas
Question 64. Which of the following statement is correct?
  1.     The heat and work are boundary phenomena
  2.     The heat and work represent the energy crossing the boundary of the system
  3.     The heat and work are path functions
  4.     All of the above
 Discuss Question
Answer: Option D. ->  All of the above
Question 65. Which of the following statement is correct?
  1.     The increase in entropy is obtained from a given quantity of heat at a low temperature.
  2.     The change in entropy may be regarded as a measure of the rate of the availability or unavailability of heat for transformation into work.
  3.     The entropy represents the maximum amount of work obtainable per degree drop in temperature.
  4.     All of the above
 Discuss Question
Answer: Option D. ->  All of the above
Question 66. Which of the following statement is incorrect?
  1.     The liquid fuels have higher calorific value than solid fuels
  2.     The solid fuels have higher calorific value than liquid fuels
  3.     A good fuel should have low ignition point
  4.     The liquid fuels consist of hydrocarbons
 Discuss Question
Answer: Option B. ->  The solid fuels have higher calorific value than liquid fuels
Question 67. Which of the following is the property of a system?
  1.     Pressure and temperature
  2.     Volume and density
  3.     Enthalpy and entropy
  4.     All of the above
 Discuss Question
Answer: Option D. ->  All of the above
Question 68. Which law states that the specific heat of a gas remains constant at all temperatures and pressures?
  1.     Charles' Law
  2.     Joule's Law
  3.     Regnault's Law
  4.     Boyle's Law
 Discuss Question
Answer: Option C. ->  Regnault's Law
Question 69. Which of the following has the highest calorific value?
  1.     Anthracite coal
  2.     Bituminous coal
  3.     Peat
  4.     Lignite
 Discuss Question
Answer: Option A. ->  Anthracite coal
Explanation :
Question 70. The value of cp/cv for air is
  1.     1
  2.     1.4
  3.     1.45
  4.     2.3
 Discuss Question
Answer: Option B. ->  1.4

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