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271. A glass tumbler containing ice shows drolets of water on the outer surface because
A. the outer surface of the tumbler shows hygroscopic effect.
B. water from inside oozes out through the wall of the tumbler.
C. the moisture in the air on coming in contact with the cold surface of the tumbler condenses into water droplets.
D. Both (A) and (B)
Explanation:
272. A material that allows partial transmission of incient light is called
A. semi - permeable
B. transducer
C. transparent
D. transluscent
Explanation:
273. Burns caused by steam are much more severe than those caused by boiling water as
A. steam is a gas and engulfs the body quickly.
B. temperature of steam is higher.
C. steam pirces through the pores of body quickly.
D. steam has latent heat
Explanation:
274. The gas which had leaked out of Union Carbide factory in Bhopal was
A. sulphur dioxide
B. chlorine
C. carbon monoxide
D. methyl isocaynate
Explanation:
275. An air bubble in water will act like a
A. Convex mirror
B. Concave mirror
C. Convex lens
D. Concave lens
Explanation:
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