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Surface Tension

Which of the ...

Question

Which of the following changes increases the overall density of the object?

A

A block of iron is formed into a hollow shape

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B

A submarine fills its ballast tanks with water

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C

A submarine fills its ballast tanks with air

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D

A fish increases the amount of gas in its swim bladder

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Solution

The correct option is B A submarine fills its ballast tanks with water
When a low-density substance is replaced by high-density substance,the overall density increases.Here air which has low density compared to water is replaced.So,the overall density increases while in removing cases overall density decreases.

Option B is correct.

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