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MCQs

Total Questions : 448 | Page 5 of 45 pages
Question 41. Unit of thermal conductivity in S.I. units is
  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 42. According to Wien's law, the wavelength corresponding to maximum energy is proportion to
  1.    Absolute temperature (T)
  2.    I²
  3.    F
  4.    T
 Discuss Question
Answer: Option A. -> Absolute temperature (T)
Question 43. Which of the following has least value of conductivity?
  1.    Glass
  2.    Water
  3.    Plastic
  4.    Air
 Discuss Question
Answer: Option D. -> Air
Question 44. According to Prevost theory of heat exchange
  1.    It is impossible to transfer heat from low temperature source to t high temperature source
  2.    Heat transfer by radiation requires no medium
  3.    All bodies above absolute zero emit radiation
  4.    Heat transfer in most of the cases takes place by combination of conduction, convection and radiation
 Discuss Question
Answer: Option C. -> All bodies above absolute zero emit radiation
Question 45. Conduction is a process of heat transfer
  1.    From one particle of the body to another without the actual motion of the particles
  2.    From one particle of the body to another by the actual motion of the heated particles
  3.    From a hot body to a cold body, in a straight line, without affecting the intervening medium
  4.    None of the above
 Discuss Question
Answer: Option A. -> From one particle of the body to another without the actual motion of the particles
Question 46. According to Dalton's law of partial pressures, (where pb = Barometric pressure, pa = Partial pressure of dry air, and pv = Partial pressure of water vapour)
  1.    Pb = pa - pv
  2.    Pb = pa + pv
  3.    Pb = pa × pv
  4.    Pb = pa/pv
 Discuss Question
Answer: Option B. -> Pb = pa + pv
Question 47. A composite slab has two layers of different materials with thermal conductivities k₁ and k₂. If each layer has the same thickness, then the equivalent thermal conductivity of the slab will be
  1.    k₁ k₂
  2.    (k₁ + k₂)
  3.    (k₁ + k₂)/ k₁ k₂
  4.    2 k₁ k₂/ (k₁ + k₂)
 Discuss Question
Answer: Option D. -> 2 k₁ k₂/ (k₁ + k₂)
Question 48. Total emissivity of polished silver compared to black body is
  1.    Same
  2.    Higher
  3.    More or less same
  4.    Very much lower
 Discuss Question
Answer: Option D. -> Very much lower
Question 49. Depending on the radiating properties, a body will be black when (Where a = absorptivity, p = reflectivity, X = transmissivity.)
  1.    P = 0, x = 0 and a = 1
  2.    P= 1, T = 0 and a = 0
  3.    P = 0, x = 1 and a = 0
  4.    X = 0, a + p = 0
 Discuss Question
Answer: Option A. -> P = 0, x = 0 and a = 1
Question 50. Heat conducted through per unit area and unit thick face per unit time when temperature difference between opposite faces is unity, is called
  1.    Thermal resistance
  2.    Thermal coefficient
  3.    Temperature gradient
  4.    Thermal conductivity
 Discuss Question
Answer: Option D. -> Thermal conductivity

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