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Which of the following is a dimensional constant?

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Which of the following is a dimensional constant?

(a) e

(b) Area

(c) Specific gravity

(d) Gravitational constant

This question was posed to me in unit test.

This is a very interesting question from Dimensions of a Physical Quantity topic in chapter Advanced Engineering Materials of Engineering Physics II

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Correct answer is (d) Gravitational constant

Best explanation: The physical quantities which posses dimensions and have constant values are called dimensional constants. Hence Gravitational constant is a dimensional constant.

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