Question

Which of the following expressions regarding the unit of coefficient of viscosity is not true?

• A. dyne $cm ^{-2}\, sec$
• B. dyne $cm^{2}\, sec^{-1}$
• C. $Nm^{-2 }\,sec$
• D. $1$ poise $= 10^{-1} Nm^{-2}\, sec$

Answer 1

Answer: (B)

The S.I unit of coefficient of viscosity is $Nm ^{-2}$ sec. The C.G.S unit of viscosity is dyne $cm ^{-2}$ sec which is equal to 1 poise.
1 poise $=10^{-1} Nm ^{-2} sec$