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- 1. Multiple Choice
If the reflectivity of an opaque surface is 0.6, then emissivity of that surface will be
0
1
0.6
0.4
can't be determined
- 2. Multiple Choice
Stefan Boltzmann Law estimate
spectral emissive power of any body
hemispherical emissive power of any body
total hemispherical emissive power of any body
None of these are correct
- 3. Multiple Choice
A light bulb of filament temperature 2400K will emit maximum power at which wavelength. This problem can be solved by
Plank's Law
Stefan Boltzmann Law
Wein Law
Kirchoff's law
- 4. Multiple Choice
reflectivity of a black body is
0
1
between 0 and 1
None of these
- 5. Multiple Choice
For a black body
Radiosity =Emissive power
Radiosity< Emissive power
Radiosity> Emissive power
There is no relation between Radiosity & Emissive power
- 6. Multiple Choice
For a gray surface
radiation properties are independent of wave length
radiation properties are independent of direction
emissivity =absorptivity=1
emissivity is not equal to absorptivity
- 7. Multiple Choice
Radiation properties can be changed by a thin coating on them
True
False
- 8. Multiple Choice
A black body is a diffuse emitter
True
False
- 9. Multiple Choice
Value of Stefan Boltzmann Constant in SI unit is
None of these
- 10. Multiple Choice
Emissivity of concrete is close to
0
1
- 11. Multiple Choice
emissivity of polished steel is close to
0
1
- 12. Multiple Choice
Infrared range of thermal radiation mostly absorved by
oxygen
carbon dioxide & water vapor
Ozone
- 13. Multiple Choice
Earth atmosphere only absorb solar radiation but not emit radiation
True
False
- 14. Multiple Choice
Higher energy contained in
Microwaves, radio waves having large wave length
X-Rays, Y-Rays with small wavelength
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