Statement I : The bridges are declared unsafe after a long use.
Statement II : Elastic strength of bridges loses with time.

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If statement I is true but statement II is false

If both statement I and statement II are true but statement II is not the correct explanation of statement I

If both statement I and statement II are false

If both statement I and statement II are true and statement II is the correct explanation of statement I

answer is A.

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Detailed Solution

When the huge traffic is passed over bridge, the strain undergoes for a long number of times every day. When the bridge is used for a long time, the elastic strength is being lost continuously. Because of it the strain in the bridge becomes very large for a particular stress and hence bridge may damage.

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