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Question

Which one of the following quantities has not been expressed in proper units ?

A
StressStrain=N/m2
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B
Surface tension=N/m
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C
Energy=kgm/s
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D
Pressure= N/m2
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Solution

The correct option is D Energy=kgm/s
Stress has the units of Force/Area = N/m2, 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 [ML2T2], hence the units have to be kgm2/s2. Thus C is incorrect option.

Pressure is Force/Area = N/m2, thus D is again correct.

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