Lakshya Education MCQs

Question: The critical radius is the insulation radius at which the resistance to heat flow is
D.None of these
Answer: Option B

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Question 1. The process of heat transfer from one particle of the fluid to another by the actual movement of the fluid particles caused by some mechanical means, is known as
  1.    Conduction
  2.    Free convection
  3.    Forced convection
  4.    Radiation
Answer: Option C
Question 2. Joule sec is the unit of
  1.    Universal gas constant
  2.    Kinematic viscosity
  3.    Thermal conductivity
  4.    Planck's constant
Answer: Option D
Question 3. The ratio of the emissive power and absorptive power of all bodies is the same and is equal to the emissive power of a perfectly black body. This statement is known as
  1.    Wien's law
  2.    Stefan's law
  3.    Kirchhoff's law
  4.    Planck's law
Answer: Option C
Question 4. According to Stefan Boltzmann law, ideal radiators emit radiant energy at a rate proportional to
  1.    Absolute temperature
  2.    Square of temperature
  3.    Fourth power of absolute temperature
  4.    Fourth power of temperature
Answer: Option C
Question 5. Two plates spaced 150 mm apart are maintained at 1000°C and 70°C. The heat transfer will take place mainly by
  1.    Convection
  2.    Radiation
  3.    Forced convection
  4.    Free convection
Answer: Option B
Question 6. Thermal conductivity of glass wool varies from sample to sample because of variation in
  1.    Composition
  2.    Density
  3.    Porosity
  4.    All of the above
Answer: Option D

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