Common Observations
It is observed that when glass is heated, it cracks while metal does not which of the following statements explains this phenomenon?
Metal is poor conductor of heat
The expansion of the glass after heating is uniform and therefore it cracks
Glass is poor conductor of heat
In case of glass, the heat is transmitted quickly when it is heated
Glass is poor conductor of heat
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The stars twinkle in the night because:A. They emit light intermittently
B. The starโs atmosphere absorbs light intermittently
C. The refractive index of the air in atmosphere fluctuates
D. The earthโs atmosphere absorbs light intermittently
Moon has no atmosphere because:
A. It is quite for off
B. It does not have any living being
C. Its surface is not smooth
D. Root mean square velocity of all gases is more than their escape velocity on moonโs surface
Clothes keep us warm in winter because they:
A. Supply heat
B. Do not radiate heat
C. Prevent the heat of the body from escaping
D. None of these
Water is a highly effective coolant for a car engine because:
A. Water is good conductor of heat
B. Water has very high specific heat capacity
C. Evaporation of water produces lot of cooling
D. None of these
Why is the light of ordinary lamp hotter than the tube light?
A. It is due to incandescence
B. It gives white light
C. It has more surface for distribution of energy
D. It is due to ionization of gases
If you float on your back, on water, your weight will be:
A. Less than the weight of water displaced by you
B. Half of your normal weight
C. Zero
D. Equal to your normal weight
Tiredness is felt on the top of the mountains because of:
A. High temperature
B. Low temperature
C. Low pressure outside the body
D. High pressure outside the body
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