Advertisements
Advertisements
प्रश्न
One end of a steel girder in a bridge is not fixed, but is kept on roliers. Give the reason.
Advertisements
उत्तर
In the construction of a bridge, steel girders are used. One end of the girder is fixed into the concrete or brick pillars and its other end is not fixed, but it is placed on rollers. The reason is that if there is any rise (or fall) in temperature of atmosphere, the girder can freely expand (or contract) without affecting the pillars.
APPEARS IN
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.
A mercury thermometer makes use of the property of the expansion of liquids on heating.
Fill in the blank
_________ determines the degree of hotness or coldness of a body.
Fill in the blank
Gases expand _______ than the liquids.
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.
Select good and bad conductors of heat from the following:
copper, mercury, wood, iron, air, saw-dust, cardboard, silver, plastic, wool.
During day time, air blows from ______ to ______.
______ is greater for liquids than solids and it is maximum in gases.
