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
View Answer
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
View Answer
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
View Answer
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
View Answer
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
View Answer
Explanation: There is vibration within the molecules and it can potentially initiate electromagnetic waves.
6. Which one is having the lowest value of solar absorptivity?
a) Black paint
b) Dull stainless steel
c) Concrete
d) White marble
View Answer
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
View Answer
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
View Answer
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
View Answer
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
View Answer
Explanation: Solar absorptivity for snow varies on the nature of its surface and its temperature.
Sanfoundry Global Education & Learning Series – Heat Transfer.
To practice all areas of Heat Transfer, here is complete set of 1000+ Multiple Choice Questions and Answers.
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