Lakshya Education MCQs

Question: The emissivity for a black body is
Options:
A. 0
B. 0.5
C. 0.75
D. 1
Answer: Option D
Explanation :

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Question 1. The value of the wave length for maximum emissive power is given by
  1.     Kirchhoff’s law
  2.     Stefan’s law
  3.     Wine’s law
  4.     Planck’s law
Answer: Option C
Explanation :
Question 2. The emissivity for a black body is
  1.     0
  2.     0.5
  3.     0.75
  4.     1
Answer: Option D
Explanation :
Question 3. The value of the wavelength for maximum emissive power is given by
  1.     Wien’s law
  2.     Planck's law
  3.     Stefan's law
  4.     Fourier's law
Answer: Option A
Explanation :
Question 4. The value of the wavelength for maximum emissive power is given by
  1.     Wien’s law
  2.     Planck's law
  3.     Stefan's law
  4.     Fourier's law
Answer: Option A
Explanation :
Question 5. The heat transfer by conduction through a thick sphere is given by
  1.     Q = 2πkr1 r2 (T1 - T2)/ (r2 - r1)
  2.     Q = 4πkr1 r2 (T1 - T2)/ (r2 - r1)
  3.     Q = 6πkr1 r2 (T1 - T2)/ (r2 - r1)
  4.     Q = 8πkr1 r2 (T1 - T2)/ (r2 - r1)
Answer: Option B
Explanation :
Question 6. The value of the wave length for maximum emissive power is given by
  1.     Kirchhoff’s law
  2.     Stefan’s law
  3.     Wine’s law
  4.     Planck’s law
Answer: Option C
Explanation :

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