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MCQs

Total Questions : 448 | Page 29 of 45 pages
Question 281. The concept of overall coefficient of heat transfer is used in heat transfer problems of
  1.    Conduction and convection
  2.    Convection
  3.    Radiation
  4.    Conduction
 Discuss Question
Answer: Option A. -> Conduction and convection
Question 282. Emissivity of a white polished body in comparison to a black body is
  1.    Depends upon the shape of body
  2.    Lower
  3.    Higher
  4.    Same
 Discuss Question
Answer: Option B. -> Lower
Question 283. The insulation ability of an insulator with the presence of moisture would
  1.    Decrease
  2.    Increase
  3.    Remain unaffected
  4.    May increase/decrease depending on temperature and thickness of insulation
 Discuss Question
Answer: Option A. -> Decrease
Question 284. The transfer of heat by molecular collision is smallest in
  1.    Gases
  2.    None of these
  3.    Liquids
  4.    Solids
 Discuss Question
Answer: Option A. -> Gases
Question 285. Thermal diffusivity of a substance is
  1.    All of these
  2.    Inversely proportional to specific heat
  3.    Inversely proportional to density of substance
  4.    Directly proportional to the thermal conductivity
 Discuss Question
Answer: Option A. -> All of these
Question 286. The heat of sun reaches to us according to
  1.    Convection
  2.    Radiation
  3.    None of these
  4.    Conduction
 Discuss Question
Answer: Option B. -> Radiation
Question 287. According to Stefan Boltzmann law, the total radiation from a black body per second per unit area is directly proportional to the
  1.    Absolute temperature
  2.    Cube of the absolute temperature
  3.    Fourth power of the absolute temperature
  4.    Square of the absolute temperature
 Discuss Question
Answer: Option C. -> Fourth power of the absolute temperature
Question 288. Cork is a good insulator because it has
  1.    Atoms colliding frequency
  2.    Porous body
  3.    Low density
  4.    Free electrons
 Discuss Question
Answer: Option B. -> Porous body
Question 289. The value of the wave length for maximum emissive power is given by
  1.    Stefan’s law
  2.    Kirchhoff’s law
  3.    Planck’s law
  4.    Wine’s law
 Discuss Question
Answer: Option D. -> Wine’s law
Question 290. Thermal conductivity of solid metals with rise in temperature normally
  1.    Remain constant
  2.    May increase or decrease depending on temperature
  3.    Decreases
  4.    Increases
 Discuss Question
Answer: Option C. -> Decreases

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