Question

Which of the following does not give the unit of energy ?

• A. Watt second
• B. Kilowatt hour
• C. Newton meter
• D. Pascal metre

Answer 1

The correct option is D Pascal metre

Energy $=M^1{L}^2{T}^{-2}$
Watt second $=M^1{L}^2{T}^{-3}\times T=M^1{L}^2{T}^{-2}$
Kilowatt hr $=M^1{L}^2{T}^{-3}\times T^1=M^1{L}^2{T}^{-2}$
Newton mt $=M^1{L}^1{T}^{-2}\times L^1=M^1{L}^2{T}^{-2}$
Pascal mt $=M^1{L}^{-1}{T}^{-2}\times L^1=M^1{L}^0{T}^{-2}$
Hence, option D is correct.