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296. Air is completely removed from an electric bulb to prevent
A. bursting of the bulb
B. oxidation of tungsten filament
C. loss of light due to absorption
D. None of these
Explanation:
297. The water in the central region and on the surface, in streams flows with higher speed compared to the other regions in the flow. The property of water responsible to resist this effect is
A. high density
B. viscosity
C. surface tension
D. compressibility
Explanation:
298. Which of the following is most elastic ?
A. Rubber
B. Sponge
C. Steel
D. Glass
Explanation:
299. What is a Hologram ?
A. A crystalline soluble amino acid
B. Photographic record for reproducing a three dimensional image
C. Apparatus for tracing the path of a charged particle
D. Graphical representation for showing frequency distribution
Explanation:
300. Ion-exchange is a process of
A. fermentation
B. metal extraction
C. water softening
D. heavy water production
Explanation:
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