| 21. | Which of the following fastening devices has a head at one end and a nut fitted to the other ? |
| a. | Bolt |
| b. | Stud |
| c. | Top bolt |
| d. | None of these |
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Answer: (b).Stud
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| 22. | Sudden fall of atmospheric pressure by a large amount is an indication of the |
| a. | rain |
| b. | cold wave |
| c. | storm |
| d. | fair weather |
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Answer: (c).storm
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| 23. | Annealing ofwhite cast iron produces __________ iron. |
| a. | grey |
| b. | nodular |
| c. | malleable |
| d. | spheroidal |
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Answer: (c).malleable
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| 24. | Resistance of an electrical conductor is proportional to its (where, l = length and A = cross-sectional area of the conductor) |
| a. | A |
| b. | l |
| c. | A² |
| d. | both 'a' & 'b' |
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Answer: (d).both 'a' & 'b'
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| 25. | A solar cell converts the sunlight directly into __________ energy. |
| a. | thermal |
| b. | electrical |
| c. | mechanical |
| d. | chemical |
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Answer: (b).electrical
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