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प्रश्न
A device in which the loss of heat due to conduction, convection and radiation is minimized is ______.
विकल्प
solar cell
solar cooker
thermometer
thermos flask
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उत्तर
A device in which the loss of heat due to conduction, convection and radiation is minimized is thermos flask.
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संबंधित प्रश्न
Fill in the blank and rewrite the sentence.
If objects of equal masses are given equal heat, their final temperature will be different. This is due to difference in their ................. .
What will absorb heat?
Water
What will absorb heat?
Soil
How can heat energy be generated?
Observe the picture given in figure. Water is being boiled in a pan of wide base.
- Which position P or T will feel warmer?
- Fill up the boxes P and T to indicate the mode of flow of heat to the hand.
The water in the black can becomes ______ than that in a white can after exposure to the sun.
In summer, we prefer light – colored clothes and in winter we usually wear dark – colored clothes.
Assertion: Small gaps left between railway lines.
Reason: It allows for the contraction of rails during summer.
You would have noticed some space being left on railway tracks. Why?
