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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.
All solids expand by the same amount when 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.
Fill in the blank
The temperature of boiling water is _______
The fig. shows a glass tumbler containing hot milk which is placed in a tub of cold water. State the direction in which heat will flow.
Why are gaps left between successive rails on a railway track ?
Why is a cement floor laid in small pieces with gaps in between?
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.
Why is a ventilator provided in a room?
Mention the factors affecting the flow of heat.
When heat energy is added to a substance, the kinetic energy of its particles ______ and so the particles move at a higher speed.
