NCERT Solutions for Chapter: Units and Measurement, Exercise 2: MCQ-II

On the basis of dimensions, decide which of the following relations for the displacement of particle undergoing simple harmonic motion is not correct.

$P, Q, R$ are physical quantities, having different dimensions, which of the following combinations can never be a meaningful quantity?

Photon is quantum of radiation with energy $\mathrm{E}=\mathrm{hv},$ where $\mathrm{v}$ is frequency and $\mathrm{h}$ is Planck's constant .The dimensions of h are the same as that of:

If the Planck's constant $\left(h\right)$ and the speed of light in vacuum $\left(c\right)$ are taken as two fundamental quantities, which one of the following can, in addition, be taken to express length, mass and time in terms of the three choosen fundamental quantities.

Which of the following ratios express pressure?

Which of the following are not unit of time?