Question

2.
If L, M, N are physical quantities with different
dimensions, then which of the following
combinations can never be a meaningful quantity?
​

Answer 1

The answer is (4) L-M/N

This can be explained as:-

It is already stated in the question that L,M and N are different physical Quantities and they have different dimensions. Also, by principal of homogeneity we know that only like quantities can be added or subtracted. So, this combination is not meaningful cause two different physical quantities with different dimensions are subtracted which is not possible.

Cheers!

Answer 2

Answer:

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