| 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
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| 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
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| 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
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| 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
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| 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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