Related Mcqs:

1. The statement that “maximum wavelength of radiation is inversely proportional to the temperature” is ______________ law?

   A. Stefan-Boltzmann’s
   B. Planck’s
   C. Wien’s displacement
   D. None of these

2. Stefan-Boltzmann law which describes the radiation heat transfer states that, it is proportional to (where, t = temperature in °C T = absolute temperature in ° K) ?

   A. t4
   B. T4
   C. 1/t4
   D. 1/T4

3. The wavelength at which the maximum monochromatic emissive power occurs for a black body, is (where, T = absolute temperature of the black body)?

   A. αT
   B. α × 1/T
   C. α T4
   D. Independent of T

4. For small temperature difference, the heat transfer rate as per Newton’s law of cooling is proportional to (where, Δt = excess temperature) ?

   A. Δt
   B. Δt2
   C. Δt3
   D. √(Δt)

5. The thermal radiation emitted by a body is proportional to Tn, where T is its absolute temperature. The value of ‘n’ is exactly 4 for__________________?

   A. Black painted bodies only
   B. All bodies
   C. Polished bodies only
   D. A black body

6. The energy radiated from a surface Q at absolute temperature T is related as__________________?

   A. Q ∝ T2
   B. Q ∝ T4
   C. Q ∝ T3
   D. None of these

7. If the thermal conductivity of a wall material is independent of temperature, the steady state temperature distribution in the very large thin plane wall having steady, uniform surface temperature follows _____________ law?

   A. Parabolic
   B. Hyperbolic
   C. Linear
   D. Logarithmic

8. If the thermal conductivity of a wall material is independent of temperature, the steady state temperature distribution in the very large thin plane wall having steady, uniform surface temperature follows ____________ law?

   A. Hyperbolic
   B. Parabolic
   C. Linear
   D. Logarithmic

9. The absorptivity of a grey body at a given temperature _____________ with increasing wavelength of radiation?

   A. Increases
   B. Decreases
   C. Remain constant
   D. May increase or decrease; depends on the material

10. Radiant energy received by a body is proportional to (where, d = the distance between the object emitting radiation and that receiving it.) ?

    A. √d
    B. d
    C. d2
    D. d1.5