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प्रश्न
Write true or false for a given statement.
Telephone wires are kept tight between the two poles in summer.
विकल्प
True
False
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उत्तर
False.
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संबंधित प्रश्न
Write true or false for a given statement.
Heat flows from a body at a high temperature to a body at a low temperature when they are kept in contact.
Write true or false for a given statement.
All solids expand by the same amount when heated to the same rise in temperature.
Write true or false for a given statement.
Equal volumes of different liquids expand by different amounts when they are heated to the same rise in temperature.
Write true or false for a given statement.
Land and sea breezes are convection currents of cold and warm air.
Select the correct alternative
The temperature of pure melting ice is
What do you understand by thermal expansion of a substance ?
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 ?
An empty glass bottle is fitted with a narrow tube at its mouth. The open end of the tube is kept in a beaker containing water. When the bottle is heated, bubbles of air are seen escaping into the water. Explain the reason.
What are the effects of heat?
Explain the following effects of heat.
Expansion
