MCQ
A unitless quantity?
- ADoes not exist
- BAlways has a nonzero dimension
- ✓Never has a nonzero dimension
- DMay have a nonzero dimension
✓
Answer
Correct option: C.
Never has a nonzero dimension
c
Dimensions of a quantity are those power to which the fundamental quantities are raised and then multiplied among each other to become equal to the quantity which we are dealing. A unit less quantity is the one in which there are no fundamental quantities involved. It doesn't have any unit and hence it doesn't have any dimensions. The dimension is Zero. Examples are, angle, elastic strain, Poisson's ratio etc.
Dimensions of a quantity are those power to which the fundamental quantities are raised and then multiplied among each other to become equal to the quantity which we are dealing. A unit less quantity is the one in which there are no fundamental quantities involved. It doesn't have any unit and hence it doesn't have any dimensions. The dimension is Zero. Examples are, angle, elastic strain, Poisson's ratio etc.
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