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141. Helium is preferred over nitrogen to be mixed with the oxygen in cylinders carried by divers because
A. helium is inert.
B. helium is non - poisonous.
C. nitrogen forms bubbles in the veins and causes pain.
D. None of these
Explanation:
142. Relativity principle was propounded by
A. Newton
B. Boyle
C. C.V. Raman
D. Einstein
Explanation:
143. An ice cube contains an iron ball in it and floats in water contained in a vessel. What will happen if the ice melts away ?
A. Level of water will not change.
B. Water level will go up.
C. Water level will go down.
D. Iron ball will sink in the vessel.
Explanation:
144. The cell theory for organisms was proposed by
A. Purkinje and Von Mohl
B. Schleiden and Schwann
C. Carolus Linnaeus
D. Felix Dujardin
Explanation:
145. Separate lumps of ice freeze into one when strongly pressed together, because
A. melting point of ice drops.
B. ice surface has sticking property.
C. pressure squeezes out the water from ice surface.
D. pressure reduces the viscosity of water.
Explanation:
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