A. 0.5
B. 1
C. 0
D. 2
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Related Mcqs:
- Absorptivity and reflectivity of a perfect black body are respectively _______________?
- A. 1 and 0 B. 0 and 1 C. 1 and ∞ D. 0 and 0.5...
- Absorptivity of a perfect black body is unity. Which of the following has maximum absorptivity ?
- A. Aluminium foil B. Refractory bricks C. Iron plate D. Coke breeze...
- The absorptivity of a body is equal to its emissivity _________________?
- A. At a particular temperature B. For circular bodies C. Under thermal equilibrium D. None of these...
- 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...
- What is the absorptivity of a black body?
- A. 1 B. 0 C. 0.78 D. 0.95...
- The ratio of total radiating power to the absorptivity of the body depends upon the _____________ as per Kirchoff‟s law?
- A. Wavelength of radiation B. Nature of the body C. Temperature of the body D. None of these...
- As per Kirchoff‟s law, the ratio of the total radiating power to the absorptivity of a body depends on the_______________?
- A. Temperature of the body only B. Wavelength of monochromatic radiation C. Both A. and B. D. Nature of material of body...
- Which of the following is generally considered as opaque surface towards radiations ?
- A. Gases B. Solids C. Liquids D. Both B. and C....
- “The ratio of the total emissive power to the absorptivity for all bodies is same at ther-mal equilibrium”. This is ______________ law?
- A. Kirchoff’s B. Planck’s C. Wien’s displacement D. Stefan-Boltzmann...
- Which of the following has the minimum absorptivity ?
- A. Aluminium foil B. Coal dust C. Refractory bricks D. Iron plates...
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