Advertisements
Advertisements
प्रश्न
One end of a steel girder in a bridge is not fixed, but is kept on roliers. Give the reason.
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.
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.
Solids expand the least and gases expand the most on being heated.
Fill in the blank
In a thermometer, the commonly used liquid is _______
Fill in the blank
The temperature of boiling water is _______
Select the correct alternative
The temperature of pure melting ice is
Name the instrument used to measure the temperature of a body.
What do you understand by thermal expansion of a substance ?
What are the good and bad conductors of heat ? Give two examples of each.
Why do we prefer to wear white or light coloured clothes in summer and black or dark coloured clothes in winter ?
