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MCQs

Total Questions : 448 | Page 31 of 45 pages
Question 301. Metals are good conductors of heat because
  1.    Their atoms collide frequently
  2.    Their atoms are relatively far apart
  3.    They contain free electrons
  4.    They have high density
 Discuss Question
Answer: Option A. -> Their atoms collide frequently
Question 302. Thermal conductivity of air at room temperature in kcal/m hr °C is of the order of
  1.    0.01
  2.    0.002
  3.    0.1
  4.    0.02
 Discuss Question
Answer: Option D. -> 0.02
Question 303. According to Stefan's law, the total radiation from a black body per second per unit area is proportional to
  1.    Absolute temperature
  2.    T2
  3.    T
  4.    T5
 Discuss Question
Answer: Option C. -> T
Question 304. The critical temperature is the temperature
  1.    Above which a gas may explode
  2.    Below which a gas does not obey gas laws
  3.    Below which a gas is always liquefied
  4.    Above which a gas will never liquefied
 Discuss Question
Answer: Option D. -> Above which a gas will never liquefied
Question 305. Thermal conductivity of non-metallic amorphous solids with decrease in temperature
  1.    Remain constant
  2.    Increases
  3.    Decreases
  4.    May increase or decrease depending on temperature
 Discuss Question
Answer: Option C. -> Decreases
Question 306. Thermal conductivity of air with rise in temperature
  1.    Increases
  2.    Remain constant
  3.    Decreases
  4.    May increase or decrease depending on temperature
 Discuss Question
Answer: Option A. -> Increases
Question 307. Thermal conductivity of water in general with rise in temperature
  1.    Remain constant
  2.    Decreases
  3.    Increases
  4.    May increase or decrease depending on temperature
 Discuss Question
Answer: Option D. -> May increase or decrease depending on temperature
Question 308. The thermal diffusivities for gases are generally
  1.    More than those for solids
  2.    Dependent on the viscosity
  3.    More than those for liquids
  4.    Less than those for liquids
 Discuss Question
Answer: Option C. -> More than those for liquids
Question 309. Heat is closely related with
  1.    Temperature
  2.    Entropy
  3.    Liquids
  4.    Energy
 Discuss Question
Answer: Option A. -> Temperature
Question 310. An ordinary passenger aircraft requires a cooling system of capacity.
  1.    2 TR
  2.    8 TR
  3.    4 TR
  4.    10 TR
 Discuss Question
Answer: Option B. -> 8 TR

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