E-PolyLearning

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

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

23. Annealing ofwhite cast iron produces __________ iron.
a. grey
b. nodular
c. malleable
d. spheroidal
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Answer: (c).malleable

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.
d. both 'a' & 'b'
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Answer: (d).both 'a' & 'b'

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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