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MCQs

Total Questions : 2096 | Page 27 of 210 pages
Question 261. Compound having large heat of formation is
  1.    More stable
  2.    Less stable
  3.    Not at all stable (like nascent O₂)
  4.    Either more or less stable ; depends on the compound
 Discuss Question
Answer: Option A. -> More stable
Question 262. The equation DU = Tds - PdV is applicable to infinitesimal changes occuring in
  1.    An open system of constant composition
  2.    A closed system of constant composition
  3.    An open system with changes in composition
  4.    A closed system with changes in composition
 Discuss Question
Answer: Option D. -> A closed system with changes in composition
Question 263. Pick out the correct statement.
  1.    Compression ratio of an Otto engine is comparatively higher than a diesel engine
  2.    Efficiency of an Otto engine is higher than that of a diesel engine for the same compression ratio
  3.    Otto engine efficiency decreases with the rise in compression ratio, due to decrease in work produced per quantity of heat
  4.    Diesel engine normally operates at lower compression ratio than an Otto engine for an equal output of work
 Discuss Question
Answer: Option B. -> Efficiency of an Otto engine is higher than that of a diesel engine for the same compression ratio
Question 264. With increase in temperature, the internal energy of a substance
  1.    Increases
  2.    Decreases
  3.    Remains unchanged
  4.    May increase or decrease; depends on the substance
 Discuss Question
Answer: Option A. -> Increases
Question 265. Y = specific heat ratio of an ideal gas is equal to
  1.    Cp/Cv
  2.    Cp/(CP-R)
  3.    1 + (R/CV)
  4.    All of the above
 Discuss Question
Answer: Option D. -> All of the above
Question 266. The standard Gibbs free energy change of a reaction depends on the equilibrium
  1.    Pressure
  2.    Temperature
  3.    Composition
  4.    All of the above
 Discuss Question
Answer: Option B. -> Temperature
Question 267. In the ammonia synthesis reaction, N₂ + 3H₂ ⇋ 2NH₃ + 22.4 kcal, the formation of NH₃ will be favoured by
  1.    High temperature
  2.    Low pressure
  3.    Low temperature only
  4.    Both low temperature and high pressure
 Discuss Question
Answer: Option D. -> Both low temperature and high pressure
Question 268. A liquid under pressure greater than its vapour pressure for the temperature involved is called a __________ liquid.
  1.    Subcooled
  2.    Saturated
  3.    Non-solidifiable
  4.    None of these
 Discuss Question
Answer: Option A. -> Subcooled
Question 269. Vapour which is at a pressure smaller than the saturation pressure for the temperature involved is called a __________ vapour.
  1.    Superheated
  2.    Desuperheated
  3.    Non-condensable
  4.    None of these
 Discuss Question
Answer: Option A. -> Superheated
Question 270. The expression, nRT In P₁/P₂ , is for the____of an ideal gas.
  1.    Compressibility
  2.    Work done under adiabatic contition
  3.    Work done under isothermal condition
  4.    Co-efficient of thermal expansion
 Discuss Question
Answer: Option C. -> Work done under isothermal condition

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