Assertion :In taking into account the fact that any object, which floats, must have an average density less than that of water, during World War I, a number of cargo vessels were made of concrete. Reason: Concrete cargo vessels were filled with air.

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

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Assertion is correct but Reason is incorrect

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Both Assertion and Reason are incorrect

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Solution

The correct option is B Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
Any object floats in water, if its density is less than water. Because it will displace a volume of water greater than the actual volume of solid material. Cargo ships were used during World War I made up of concrete (ferrocement and steel) because they were cheap. Hence, both statements are correct but reason is not correct explanation of assertion.

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