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291. Rayon is chemically
A. glucose
B. amylose
C. cellulose
D. pectin
Explanation:
292. Consider the following surfaces : 1. Surface coated with lamp black 2. Polished surface 3. Surface painted whiteThe correct sequence of the decreasing order of the emissive powers of the given surfaces will be
A. 1, 3, 2
B. 2, 1, 3
C. 2, 3, 1
D. 3, 1, 2
Explanation:
293. Which of the following is a good conductor of heat but a bad conductor of electricity ?
A. Mica
B. Asbests
C. Aluminium
D. Titanium
Explanation:
294. Sea water is saltier than rain water because
A. sea animals are salt producing.
B. rivers wash away salts from earth and pour them into sea.
C. sea beds have salt producing mines.
D. the air around sea is saltish.
Explanation:
295. Which of the following metals is as strong as steel but half as much in weight ?
A. Aluminum
B. Titanium
C. Copper
D. Platinum
Explanation:
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