A. Black
B. White
C. Grey
D. Any colour
Related Mcqs:
- 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 - The Stefan-Boltzmann constant depends on the_________________?
A. Medium
B. Temperature
C. Surface
D. None of these - The thermal radiative flux from a surface of emissivity = 0.4 is 22.68 kW/m2. The approximate surface temperature (K) is (Stefan-Boltzmann constant = 5.67 × 10-8 W/m2.K4) ?
A. 1000
B. 727
C. 800
D. 1200 - The value of Stefan-Boltzmann constant in SI unit is_________________?
A. 5.6697 × 10-8W/m2.°K4
B. 0.1714 × 10-8W/m2.°K4
C. 5.6697 × 10-8kcal/m2. °K4
D. 0.1714 × 10-8kcal/m2. °K4 - Stefan’s block body radiation law can also be derived from ______________ law?
A. Kirchoff’s
B. Planck’s
C. Fourier’s
D. None of these - Fourier’s law of heat conduction applies to _____________ surfaces?
A. Isothermal
B. Non-isothermal
C. Both A. and B.
D. Neither A. and B. - Kirchoff‟s law applies to _____________ radiation?
A. Total
B. Monochromatic
C. Both A. & B.
D. Neither A. nor B. - Fourier’s law applies to the heat transfer by__________________?
A. Convection
B. Radiation
C. Conduction
D. All A., B. & C. - 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
