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256. In summer, a cloudy night is hotter than a starlit night because
A. clouds work as a thick blanket and produce heat.
B. clouds do not allow cold air to reach earth.
C. clouds prevent the heat radiated by the earth from escaping to the sky.
D. heat is generated by clouds and radiated back to earth.
Explanation:
257. All the watches which are on the principle of oscillating springs, if carried to Moon, will
A. stop working
B. work unaffected
C. slow down
D. move faster
Explanation:
258. Wha are soaps ?
A. Salts of silicates
B. Esters of heavy fatty acids
C. Sodium or potassium salts of heavier fatty acids
D. Mixture of glycerol and alcohols
Explanation:
259. When some impurity is added to the solvent, its boiling point
A. remains unchanged
B. increases with the amount of impurity
C. decreases with the amount of impurity
D. decreases and then increases
Explanation:
260. Vegetable crop with rectangular seeds is
A. carrot
B. turnip
C. onion
D. fenugreek
Explanation:
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