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251. A ball bounces higher at high altitudes than on plains because
A. downward pull due to gravity is less at higher altitudes.
B. the pressure at higher altitueds is higher than theat on plains.
C. the rarefied air offers less resistance to the ball
D. None of these
Explanation:
252. The best quality of coal with least ash content is
A. anthracite
B. bituminous
C. lignite
D. peat
Explanation:
253. Which of the following is used in the preparation of bread ?
A. Nitric acid
B. Sulphuric acid
C. Tartaric acid
D. Phthalic acid
Explanation:
254. Due to Which of the following a shaving blade when placed gently on water floats ?
A. Surface tension
B. Viscosity
C. Law of floatation
D. Archimedes principle
Explanation:
255. A ship rises as it enters the sea from a river because the
A. water in sea is hard water.
B. larger quantity f water in the sea pushes the ship upwards.
C. density of sea water is lower than that of the river water.
D. density of sea water is higher than that of the river water.
Explanation:
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