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प्रश्न
Select the correct alternative
Which of the statement is correct
विकल्प
Iron rims are cooled before they are placed on cartwheels
A glass stopper gets tight on warming the neck of the bottle
Telephone wires sag in winter, but become tight in summer
A little space is left between two rails on a railway track
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उत्तर
A little space is left between two rails on a railway track
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संबंधित प्रश्न
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.
Water is a bad conductor of heat.
What do you understand by thermal expansion of a substance ?
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.
Explain why we wear woolen clothes in winter.
Explain why the water pipes are covered with cotton during very cold weather.
Why are quilts filled with fluffy cotton?
What are the land and sea breezes? Explain their formation.
In ice cubes, the force of attraction between the water molecules is ______.
______ is the only matter on the Earth that can be found naturally in all three states.
