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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