# 10) Which one of the following quantities has not been expressed in proper units ? * O Torque : Newton meter O Stress : Newton metre^-2 O Modulus of elasticity: Newton metre-2 O Surface tension : Newton metre-2

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**Answer:**

Correct option is

C

Energy=kg−m/s

Stress has the units of Force/Area = N/m

2

, while strain (=Δl/l) is dimensionless. So option A is correct.

Surface tension is Force/Length, thus N/m, hence B is also correct.

Energy has the units of [ML

2

T

−2

], hence the units have to be kgm

2

/s

2

. Thus C is incorrect option.

Pressure is Force/Area = N/m

2

, thus D is again

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