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MCQs

Total Questions : 448 | Page 36 of 45 pages
Question 351. The amount of radiation mainly depends upon the
  1.    Nature of the body
  2.    Temperature of the body
  3.    Type of surface of the body
  4.    All of these
 Discuss Question
Answer: Option D. -> All of these
Question 352. The highest thermal diffusivity is of
  1.    Iron
  2.    Lead
  3.    Concrete
  4.    Wood
 Discuss Question
Answer: Option B. -> Lead
Question 353. Unit of thermal conductivity in S
  1.    J/m² sec
  2.    J/m °K sec
  3.    W/m °K
  4.    Option (B) and (C) above
 Discuss Question
Answer: Option D. -> Option (B) and (C) above
Question 354. The value of Prandtl number for air is about
  1.    0.1
  2.    0.3
  3.    0.7
  4.    1.7
 Discuss Question
Answer: Option C. -> 0.7
Question 355. The radiation emitted by a black body is known as
  1.    Black radiation
  2.    Full radiation
  3.    Total radiation
  4.    All of these
 Discuss Question
Answer: Option D. -> All of these
Question 356.  Unit of thermal conductivity in S.I. units is
  1.    J/m2 sec
  2.    J/m °K sec
  3.    W/m °K
  4.    (B) and (C) above
 Discuss Question
Answer: Option D. -> (B) and (C) above
Question 357.  In heat transfer, conductance equals conductivity (kcal/hr/sqm/°C/cm) divided by
  1.    HR (time)
  2.    SQM (area)
  3.    °C (temperature)
  4.    CM (thickness)
 Discuss Question
Answer: Option D. -> CM (thickness)
Question 358.  According to planck's law, the wavelength corresponding to the maximum energy is proportional to
  1.    Absolute temperature T
  2.    T2
  3.    T4
  4.    1/T
 Discuss Question
Answer: Option C. -> T4
Question 359.  Heat transfer takes place as per
  1.    Zeroth law of thermodynamics
  2.    First law of thermodynamics
  3.    Second law of the thermodynamics
  4.    Kirchoff's law
 Discuss Question
Answer: Option C. -> Second law of the thermodynamics
Question 360.  Thermal conductivity of solid metals with rise in temperature normally
  1.    Increases
  2.    Decreases
  3.    Remains constant
  4.    May increase or decrease depending on temperature
 Discuss Question
Answer: Option B. -> Decreases

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