Q. The pair(s) of physical quantities that has/have the same dimensions is(are)

Physical World, Units and Measurements Report Error

A

volumetric strain and coefficient of friction

B

disintegration constant of a radioactive substance and frequency of light wave

C

heat capacity and gravitational potential

D

Planck's constant and torque

Solution:

(1) Strain and coefficient of friction both are dimensionless
(2) Disintegration constant and frequency of light both have dimensions $\left[T^{-1}\right]$
(3) Heat capacity has unit cal/kg while gravitational potential has unit J/kg i.e. both have dimensions $\left[L^{2} T^{-2}\right]$.

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3. The external and internal diameters of a hollow cylinder are measured to be $\left(4.23\pm0.01\right)$ cm and $\left(3.89\pm0.01\right)$cm. The thickness of the wall of the cylinder is

4. The $SI$ unit of magnetic flux is

5. $SI $ unit of molar gas constant is

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