|
Distinguish between conduction, convection and radiation
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1
|
6958
|
December 23, 2016
|
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Explain why a body with large reflectivity is a poor emitter
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2
|
3851
|
December 23, 2016
|
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Explain the following Hot tea cool rapidly when poured into the saucer from the cup
|
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2
|
1638
|
December 23, 2016
|
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Two vessels A and B of different materials but having identical shape
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2
|
1234
|
December 23, 2016
|
|
On a hot day, a car is left in sunlight with all the windows closed
|
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2
|
1453
|
December 23, 2016
|
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A piece of paper wrapped tightly on a wooden rod
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2
|
1323
|
December 23, 2016
|
|
Woolen clothes are warm in winter. Why?
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1
|
461
|
December 23, 2016
|
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The earth constantly receives heat radiation from the sun and gets warmed up. Why does the earth not get as hot as the sun?
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1
|
677
|
December 23, 2016
|
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How does tea in a thermo flask remain hot for a long time?
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1
|
1849
|
December 23, 2016
|
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If a drop of water falls on a very hot iron, it does not evaporate for a long time. Give reason
|
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1
|
3314
|
December 23, 2016
|
|
Why it is much hotter above afire than by its side?
|
|
1
|
920
|
December 23, 2016
|
|
Why rooms are provided with the ventilators near the roof?
|
|
1
|
4707
|
December 23, 2016
|
|
Two thermos flasks are of the same height and same capacity
|
|
2
|
821
|
December 23, 2016
|
|
What kind of thermal conductivity and specific heat requirements would you specify for cooking utensils?
|
|
1
|
6835
|
December 23, 2016
|
|
In a coal fire, the pockets formed by coals appear brighter than the coals themselves
|
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2
|
1157
|
December 23, 2016
|
|
Why birds are often seen to swell their feathers in winter?
|
|
1
|
1457
|
December 23, 2016
|
|
Place a safety pin on a sheet of paper
|
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2
|
356
|
December 23, 2016
|
|
Why water is preferred to any other liquid in the hot water bottles?
|
|
1
|
1022
|
December 23, 2016
|
|
Can we boil water inside in the earth satellite?
|
|
1
|
1657
|
December 23, 2016
|
|
White clothes are more comfortable in summer while colourful clothes are more comfortable in winter. Why?
|
|
1
|
911
|
December 23, 2016
|
|
The triple point of water is a standard fixed point in modem thermometry
|
|
2
|
1435
|
December 23, 2016
|
|
The triple points of neon and carbon dioxide are 24.57 K and 216.55 K respectively
|
|
2
|
1621
|
December 23, 2016
|
|
The difference between length of a certain brass rod and that of a steel rod is claimed to be constant at all temperatures. Is this possible?
|
|
1
|
3900
|
December 23, 2016
|
|
In what ways are gas thermometers superior to mercury thermometers?
|
|
1
|
957
|
December 23, 2016
|
|
Two identical rectangular strips-one of copper
|
|
2
|
318
|
December 23, 2016
|
|
There are two spheres of same radius and material at same temperature
|
|
2
|
5726
|
December 23, 2016
|
|
Gas thermometers are more sensitive than mercury thermometers. Why?
|
|
1
|
1429
|
December 23, 2016
|
|
There is a slight temperature difference between the waterfall at the top and the bottom. Why?
|
|
1
|
3669
|
December 23, 2016
|
|
What are the basic requirements of a cooking utensil in respect of specific heat
|
|
2
|
1875
|
December 23, 2016
|
