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
(3) Heat capacity has unit cal/kg while gravitational potential has unit J/kg i.e. both have dimensions .

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3. The external and internal diameters of a hollow cylinder are measured to be cm and cm. The thickness of the wall of the cylinder is

4. The unit of magnetic flux is

5. unit of molar gas constant is

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