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Answer:
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1 )
These gaps in the bridges are known as expansion joints.
Expansion joints are basically gaps in the bridge that allow the bridge to expand and contract.
Without these gaps, the bridge may fall apart. ...
These components expand with higher temperature and contract at lower temperatures.
2)
These glass strips in floor prevents the developement of cracks which usually occur due to expansion or contraction of floor and it also helps in releasing the heat develop during the heat of hydration of cement which is the main cause of cracks develope in the cement floor.
3)
The iron ring to be put on the rim of a cart wheel is always of slightly smaller diameter than that of the wheel. When the iron ring is heated to become red hot, it expands and slips on to the wheel easily. When it is cooled, it contracts and grips the wheel firmly.
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4.YES GAPS ARE LEFT IN BRIDGES AND AT THE ENDS WHICH ARE PLACED ON ROLLERS AS DURING SUMMER DUE TO HEAT METALS GENERALLY EXPAND AND HERE THE GAPS ARE LEFT TO AVOID EXPANSION OF THEM IF GAPS WEREN'T LEFT IT CAN CAUSE DERAILMENT.
5.WE USE GLASS PIECES WHILE LAYING A CEMENT FLOOR BEACUSE IT HELPS IN AVOIDING CRACKS.
6.WE GENERALLY HEAT IRON RIM BEFORE FING IT INTO THE CART WHEEL BECAUSE ITS RADIUS IS LESS WHEN COMPARED TO THE CART WHEEL DUE TO THAT HEAT IT CAN EASILY SLIP INTO WHEEL AND AFTER CONTRACTION IT KEEPS THE WHEEL FIRM AND TIGHT.