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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.
Kerosene contracts on heating.
Fill in the blank
Black and dull surfaces are ______ of heat.
Why do telephone wires sag in summer ?
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 ?
One end of a steel girder in a bridge is not fixed, but is kept on roliers. Give the reason.
State one application of thermal expansion of liquids.
Why is an oven made of double walls with the space in between filled with cork ?
Explain why we wear woolen clothes in winter.
The bottom of a cooking utensil is painted black. Give the reason.
Mention the factors affecting the flow of heat.
