# Heat Transfer Questions and Answers – Solar Absorptivity

This set of Heat Transfer Multiple Choice Questions & Answers (MCQs) focuses on “Solar Absorptivity”.

1. Which one is having the highest value of solar absorptivity?
a) White marble
b) Concrete
c) Asphalt
d) Snow

Explanation: Solar absorptivity for asphalt is 0.90 while that of white marble, concrete and snow are 0.46, 0.60 and 0.28 respectively.

2. What is the value of solar absorptivity for aluminum foil?
a) 0.15
b) 0.16
c) 0.17
d) 0.18

Explanation: Solar absorptivity doesn’t require a medium and for aluminum, it reaches maximum efficiency in a vacuum.

3. What is the value of solar absorptivity for polished copper?
a) 0.17
b) 0.18
c) 0.19
d) 0.20

Explanation: Solar absorptivity for polished copper depends on the frequency and wavelength of the radiation.

4. Which one is having the lowest value of solar absorptivity?
a) Snow
b) Red brick
c) Aluminum foil
d) Polished aluminum

Explanation: Solar absorptivity for polished aluminum is 0.09 while that of red brick, aluminum foil and snow are 0.63, 0.15 and 0.28 respectively.

5. What is the value of solar absorptivity for polished stainless steel?
a) 0.37
b) 0.36
c) 0.35
d) 0.34

Explanation: There is vibration within the molecules and it can potentially initiate electromagnetic waves.
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6. Which one is having the lowest value of solar absorptivity?
a) Black paint
b) Dull stainless steel
c) Concrete
d) White marble

Explanation: Solar absorptivity for white marble is 0.46 while that of black paint, dull stainless steel and concrete are 0.97, 0.50 and 0.60 respectively.

7. What is the value of solar absorptivity for white marble?
a) 0.45
b) 0.46
c) 0.47
d) 0.48

Explanation: It generates and receives electromagnetic waves at the expense of its stored energy.

8. Which one is having the highest value of solar absorptivity?
a) Red brick
b) Asphalt
c) Black paint
d) White paint

Explanation: Emissivity of black paint is 0.97 while that of red brick, asphalt and white paint are 0.63, 0.90 and 0.14 respectively.

9. What is the value of solar absorptivity for asphalt?
a) 0.90
b) 0.80
c) 0.70
d) 0.60

Explanation: Energy emitted by asphalt is not continuous but is in the form of quanta.

10. What is the value of solar absorptivity for snow?
a) 0.25
b) 0.26
c) 0.27
d) 0.28

Explanation: Solar absorptivity for snow varies on the nature of its surface and its temperature.

Sanfoundry Global Education & Learning Series – Heat Transfer.

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