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301. Water is a highly effective coolant for a car engine because
A. water boils at a comparatively high temperature.
B. water is a good conductor of heat.
C. evaporation of water produces lot of cooling.
D. water has very high specific heat capacity.
Explanation:
302. Who suggested that most of the mass of the atom is located in the nucleus ?
A. Thompson
B. Bohr
C. Rutherford
D. None of these
Explanation:
303. White coal is
A. uranium
B. ice
C. hydro-electricity
D. diamond
Explanation:
304. A piece of wood is floating in water. If we heat the water, the piece of wood will
A. increase in size
B. rise a little
C. float at the same level
D. sink a little
Explanation:
305. Food remains unspoilt in a refrigerator for a longer time because
A. the antibiotice inside a refrigerator kill bacteria and fungus.
B. the low temperature inside males the food shrink and thereby crush the germs.
C. Bacteria and fungus can not multiply fast at sufficiently low temperatures.
D. Refrigerator contains food preservatives that get activated at low temperatures.
Explanation:
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