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in Physics by (65.8k points)

Assertion : The bridges are declared unsafe after a long use. 

Reason : Elastic strength of bridges decrease with time.

(A) If both assertion and reason are true and reason is the correct explanation of the assertion. 

(B) If both assertion and reason are true but reason is not the correct explanation of the assertion. 

(C) If assertion is true but reason is false. 

(D) If assertion and reason both are false. 

1 Answer

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Best answer

Correct option: (A)

Explanation:

A bridge during its use undergoes alternating strains for a large number of times each day. When bridge is use for long time, its loses it's strength due to which amount of strain in the bridge for a given stress will become very large and ultimately the bridge may collapse. Hence after long use bridges are declared unsafe.

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