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1361. Water is a good fire extinguisher because : 1. the secific heat of water is high 2. steam, formed as the water boils in contact with the burning object, forms an envelop and shuts off oxygen supply
A. 1 only
B. 2 only
C. both 1 and 2
D. neither 1 nor 2
Explanation:
1362. What happens to the level of mercury in the barometer tube when it is taken down a coal mine ? It
A. falls
B. remains unaltered
C. rises
D. rises and then falls
Explanation:
1363. For which one of the following is capillarity not the only reason ?
A. Blotting of ink
B. Rising of underground water
C. Spread of water drop on a cotton cloth
D. Rising of water from the roots of a plant to its foliage
Explanation:
1364. Which of the following is used as a material for making protective windows in space probes ?
A. Steel
B. Graphite
C. Tungsten
D. Diamond
Explanation:
1365. Which of the following is the correct sequence of the regions of the sun as one moves from its core to the surface ? 1. Photosphere2. Chromosphere3. Convection zone4. Corona
A. 1, 2, 3, 4
B. 1, 3, 4, 2
C. 2, 3, 4, 1
D. 2, 1, 3, 4
Explanation:
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