E-PolyLearning

1. The value of transmissivity may vary from
a. 0-1
b. 1-2
c. 3-4
d. 4-5
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Answer: (a).0-1

2. Of the radiant energy 350W/m² incident upon a surface 250W/m² is absorbed, 60W/m² is reflected and the remainder is transmitted through the surface. Workout the value for absorptivity for the surface material
a. 0.113
b. 0.114
c. 0.115
d. 0.116
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Answer: (c).0.115

3. “Transmissivity can also be defined as ratio of transmitted radiation to that of incident energy flow”. True or false
a. True
b. False
c. May be
d. Can't say
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Answer: (b).False

4. A cavity with a small hole will always behave as a
a. White body
b. Transparent body
c. Black body
d. Opaque body
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Answer: (c).Black body

5. What is the wavelength band of gamma rays?
a. 1 * 10¯⁷ to 4 * 10¯⁴ micron meter
b. 2 * 10¯⁷ to 2.4 * 10¯⁴ micron meter
c. 3 * 10¯⁷ to 3.4 * 10¯⁴ micron meter
d. 4 * 10¯⁷ to 1.4 * 10¯⁴ micron meter
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Answer: (d).4 * 10¯⁷ to 1.4 * 10¯⁴ micron meter

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