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

\frac{S t r e s s}{S t r a i n} = N / m^{2}

No worries! We‘ve got your back. Try BYJU‘S free classes today!

S u r f a c e t e n s i o n = N / m

No worries! We‘ve got your back. Try BYJU‘S free classes today!

E n e r g y = k g - m / s

Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses

P r e s s u r e =

N / m^{2}

No worries! We‘ve got your back. Try BYJU‘S free classes today!

Open in App

Solution

The correct option is D $E n e r g y = k g - m / s$
Stress has the units of Force/Area = $N / m^{2}$ , while strain (= $Δ l / l$ ) 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 $[M L^{2} T^{- 2}]$ , hence the units have to be $k g m^{2} / s^{2}$ . Thus C is incorrect option.

Pressure is Force/Area = $N / m^{2}$ , thus D is again correct.

Suggest Corrections