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प्रश्न
Fill in the blank
Black and dull surfaces are ______ of heat.
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उत्तर
Black and dull surfaces are good absorbers of heat.
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संबंधित प्रश्न
Fill in the blank
_________ determines the degree of hotness or coldness of a body.
Fill in the blank
Still air is an __________ of heat.
The fig. shows a glass tumbler containing hot milk which is placed in a tub of cold water. State the direction in which heat will flow.
Why are gaps left between successive rails on a railway track ?
A glass stopper stuck in the neck of a bottle can be removed by pouring hot water on the neck of the bottle. Explain why ?
Why is a cement floor laid in small pieces with gaps in between?
Explain why we wear woolen clothes in winter.
Why are quilts filled with fluffy cotton?
What are the land and sea breezes? Explain their formation.
When heat energy is added to a substance, the kinetic energy of its particles ______ and so the particles move at a higher speed.
