COMEDK Exam 2017 Solved Paper

Young's modulus, Y=‌

‌ Stress ‌

‌ Strain ‌

Here, strain is a dimensionless quantity and stress is measured in SI unit of Nm−2, dyne cm−2 or pascal.
So, the Young's modulus has the same unit as stress.
∴Nm−1 is not a unit of Young's modulus.