Question

Assertion The bridges are declared unsafe after a long use.
ReasonThe bridges lose their elastic strength with time.

• A. If both Assertion and Reason are true and the Reason is correct explanation of the Assertion
• B. If both Assertion and Reason are true but Reason is not correct explanation of the Assertion
• C. If Assertion is true but Reason is false
• D. If Assertion is false but the Reason is true

Answer 1

Answer: (A)

A bridge during its use undergoes alternating strains for a large number of times each day, depending upon the movement of vehicles on it. When a bridge is used for long time, it losses its elastic strength due to which the amount of strain in the bridge for a given stress will become large and ultimately, the bridge may collapse. This may not happens if the bridges are declared unsafe after long use.