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प्रश्न
Select the correct alternative
Which of the statement is correct
पर्याय
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
APPEARS IN
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.
Why do telephone wires sag in summer ?
Why are gaps left between successive rails on a railway track ?
State one application of thermal expansion of liquids.
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.
State which expands more, when heated to the same temperature : solid, liquid or gas ?
In summer, ice is kept wrapped in a gunny bag. Explain the reason.
Why is an oven made of double walls with the space in between filled with cork ?
Why are chimneys provided over furnace in factories?
During day time, air blows from ______ to ______.
