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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