Lakshya Education MCQs

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

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More Questions on This Topic :

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
Explanation :
Question 2. The emissivity for a black body is
1.     0
2.     0.5
3.     0.75
4.     1
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
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
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)