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MCQs

Total Questions : 1058 | Page 9 of 106 pages
Question 81. The energy of molecular motion appears as
  1.     Heat
  2.     Potential energy
  3.     Surface tension
  4.     Friction
 Discuss Question
Answer: Option A. ->  Heat
Question 82. Which law states that the internal energy of a gas is a function of temperature?
  1.     Charles' law
  2.     Joule's law
  3.     Boyle's law
  4.     There is no such law
 Discuss Question
Answer: Option B. ->  Joule's law
Question 83. In order that a cycle be reversible, following must be satisfied
  1.     Free expansion or friction resisted expansion/compression process should not be encountered
  2.     When heat is being absorbed, temperature of hot source and working substance should be same
  3.     When beat is being rejected, temperature of cold source and working substance should be same
  4.     All of the above
 Discuss Question
Answer: Option D. ->  All of the above
Question 84. Which of the following can be regarded as gas so that gas laws could be applicable, within the commonly encountered temperature limits?
  1.     O₂, N₂, steam, CO₂
  2.     O₂, N₂, water vapour
  3.     SO₂, NH₃, CO₂, moisture
  4.     O₂, N₂, H₂, air
 Discuss Question
Answer: Option D. ->  O₂, N₂, H₂, air
Question 85. The standard value of atmospheric pressure taken at sea level is
  1.     1.013 bar
  2.     760 mm of Hg
  3.     1013 × 102 N/m2
  4.     All of these
 Discuss Question
Answer: Option D. ->  All of these
Question 86. The value of n = 1 in the polytropic process indicates it to be
  1.     Reversible process
  2.     Isothermal process
  3.     Adiabatic process
  4.     Irreversible process
 Discuss Question
Answer: Option B. ->  Isothermal process
Question 87. The general gas energy equation is (where q1 - 2 = heat supplied, du = change in internal energy, and w1 - 2 = work done in heat units)
  1.     Q1 - 2 = dU + W1 - 2
  2.     Q1 - 2 = dU - W1 - 2
  3.     Q1 - 2 = dU/W1 - 2
  4.     Q1 - 2 = dU × W1 - 2
 Discuss Question
Answer: Option A. ->  Q1 - 2 = dU + W1 - 2
Question 88. For reversible adiabatic process, change in entropy is
  1.     Maximum
  2.     Minimum
  3.     Zero
  4.     Negative
 Discuss Question
Answer: Option C. ->  Zero
Question 89. If a system after undergoing a series of processes, returns to the initial state then
  1.     Process is thermodynamically in equilibrium
  2.     Process is executed in closed system cycle
  3.     Its entropy will change due to irreversibility
  4.     Sum of heat and work transfer will be zero
 Discuss Question
Answer: Option D. ->  Sum of heat and work transfer will be zero
Question 90. When coal is first dried and then crushed to a fine powder by pulverizing machine, the resulting fuel is called
  1.     Wood charcoal
  2.     Bituminous coal
  3.     Briquetted coal
  4.     None of these
 Discuss Question
Answer: Option D. ->  None of these

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