question_answer

Out of the following four dimensional quantities, which one qualifies to be called a dimensional constant?

A)  Acceleration due to gravity

B)  Surface tension of water

C)  Weight of a standard kilogram mass

D)  The velocity of light hi vacuum

Correct Answer: D

Solution :

Work done = area enclosed by F-x graph. = area of ABNM + area of CDEN - area of EFGH + area of HIJ \[=1\times 10+1\times 5-1\times 5+\frac{1}{2}\times 1\times 10\] \[=10+5-5+5=15\,\,J\]