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MCQs

Total Questions : 448 | Page 2 of 45 pages
Question 11. Planck’s law holds good for
  1.     black bodies
  2.     polished bodies
  3.     all coloured bodies
  4.     all of the above
 Discuss Question
Answer: Option A. ->  black bodies
Explanation :
Question 12. When α is absorptivity, ρ is reflectivity and τ is transmissivity, then for a diathermanous body,
  1.     α = 1, ρ = 0 and τ = 0
  2.     α = 0, ρ = 1 and τ = 0
  3.     α = 0, ρ = 0 and τ = 1
  4.     α + ρ = 1 and τ = 0
 Discuss Question
Answer: Option C. ->  α = 0, ρ = 0 and τ = 1
Explanation :
Question 13. Wien’s law states that the wave length corresponding to ________ is proportional to the absolute temperature.
  1.     Minimum energy
  2.     Maximum energy
  3.     Both (A) and (B)
  4.     None of these
 Discuss Question
Answer: Option B. ->  Maximum energy
Explanation :
Question 14. Wien’s law states that the wave length corresponding to ________ is proportional to the absolute temperature.
  1.     Minimum energy
  2.     Maximum energy
  3.     Both (A) and (B)
  4.     None of these
 Discuss Question
Answer: Option B. ->  Maximum energy
Explanation :
Question 15. Wien’s law states that the wave length corresponding to ________ is proportional to the absolute temperature.
  1.     Minimum energy
  2.     Maximum energy
  3.     Both (A) and (B)
  4.     None of these
 Discuss Question
Answer: Option B. ->  Maximum energy
Explanation :
Question 16. When absorptivity (α) = 1, reflectivity (ρ) = 0 and transmissivity (τ) = 0, then the body is said to be a
  1.     Black body
  2.     Grey body
  3.     Opaque body
  4.     White body
 Discuss Question
Answer: Option A. ->  Black body
Explanation :
Question 17. The unit of stefan boltzmann constant is
  1.     watt/cm3 °K
  2.     watt/cm4 °K
  3.     watt2/cm °K⁴
  4.     watt/cm2 °K⁴
 Discuss Question
Answer: Option D. ->  watt/cm2 °K⁴
Explanation :
Question 18. When absorptivity (α) = 1, reflectivity (ρ) = 0 and transmissivity (τ) = 0, then the body is said to be a
  1.     Black body
  2.     Grey body
  3.     Opaque body
  4.     White body
 Discuss Question
Answer: Option A. ->  Black body
Explanation :
Question 19. When absorptivity (α) = 1, reflectivity (ρ) = 0 and transmissivity (τ) = 0, then the body is said to be a
  1.     Black body
  2.     Grey body
  3.     Opaque body
  4.     White body
 Discuss Question
Answer: Option A. ->  Black body
Explanation :
Question 20. The expression q = ρ at4 is called
  1.     Fourier equation
  2.     Stefan-Boltzmann equation
  3.     Newton Reichmann equation
  4.     Joseph-Stefan equation
 Discuss Question
Answer: Option B. ->  Stefan-Boltzmann equation
Explanation :

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