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MCQs

Total Questions : 1058 | Page 93 of 106 pages
Question 921. In a free expansion process
  1.    Heat transfer is zero
  2.    Both (A) and (B) above
  3.    Work done is zero
  4.    Work done is zero but heat increases
 Discuss Question
Answer: Option B. -> Both (A) and (B) above
Question 922. Work-done during adiabatic expansion is given by (where p1 v1, T1 = Pressure, volume and temperature for the initial condition of gas, p2, v2, T2 = Corresponding values for the final condition of gas, R = Gas constant, and γ = Ratio of specific heats)
  1.    [m R (T1 - T2)] /(γ - 1)
  2.    All of these
  3.    (p1 v1 - p2, v2)/(γ - 1)
  4.    [m R T1/(γ - 1)][1 - (p2, v2 /p1 v1)]
 Discuss Question
Answer: Option B. -> All of these
Question 923. The ratio of two specific heats of air is equal to
  1.    0.1
  2.    0.24
  3.    1.41
  4.    0.17
 Discuss Question
Answer: Option C. -> 1.41
Question 924. According to Kelvin-Planck’s statement of second law of thermodynamics,
  1.    It is impossible to construct a device which operates in a cyclic process and produces no effect other than the transfer of heat from a cold body to a hot body
  2.    It is possible to construct an engine working on a cyclic process, whose sole purpose is to convert heat energy into work
  3.    It is impossible to construct an engine working on a cyclic process, whose sole purpose is to convert heat energy into work
  4.    None of these
 Discuss Question
Answer: Option C. -> It is impossible to construct an engine working on a cyclic process, whose sole purpose is to convert heat energy into work
Question 925. If a certain amount of dry ice is mixed with same amount of water at 80°C, the final temperature of mixture will be
  1.    80°C
  2.    20°C
  3.    0°C
  4.    40°C
 Discuss Question
Answer: Option C. -> 0°C
Question 926. Which of the following statement is correct according to Clausis statement of second law of thermodynamics?
  1.    It is possible to transfer heat from a body at a lower temperature to a body at a higher temperature by using refrigeration cycle.
  2.    None of these
  3.    It is possible to transfer heat from a body at a lower temperature to a body at a higher temperature.
  4.    It is impossible to transfer heat from a body at a lower temperature to a body at a higher temperature, without the aid of an external source.
 Discuss Question
Answer: Option D. -> It is impossible to transfer heat from a body at a lower temperature to a body at a higher temperature, without the aid of an external source.
Question 927. 1 kgf/cm² is equal to
  1.    735.6 mm Hg
  2.    Zero mm Hg
  3.    1 mm Hg
  4.    760 mm Hg
 Discuss Question
Answer: Option A. -> 735.6 mm Hg
Question 928. Which of the following is the correct statement of the second law of thermodynamics?
  1.    There is a definite amount of mechanical energy, which can be obtained from a given quantity of heat energy
  2.    It is impossible to transfer heat from a body at a lower temperature to a higher temperature, without the aid of an external source
  3.    It is impossible to construct an engine working on a cyclic process, whose sole purpose is to convert heat energy into work
  4.    All of these
 Discuss Question
Answer: Option D. -> All of these
Question 929. The fuel mostly used in blast furnace for extracting pig iron from iron ores is
  1.    Bituminous coal
  2.    Hard coke
  3.    Soft coke
  4.    Pulverized coal
 Discuss Question
Answer: Option B. -> Hard coke
Question 930. On volume basis, air contains following parts of oxygen
  1.    77
  2.    21
  3.    23
  4.    25
 Discuss Question
Answer: Option B. -> 21

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