Physics MCQs for NEET — Practice Questions with Answers

The torr is a unit of pressure based on an absolute scale, defined as exactly 1760 of a standard atmosphere (101325 Pa).

Unit of volume is derived unit because, volume =${\left(Leangth\right)}^3$

$\mathrm{Dyne} \mathrm{is} \mathrm{the} \mathrm{unit} \mathrm{of} \mathrm{force} \mathrm{and} {\mathrm{cm}}^2 \mathrm{is} \mathrm{the} \mathrm{unit} \mathrm{of} \mathrm{area}. \mathrm{So}, \mathrm{Dyne}/{\mathrm{cm}}^2 \mathrm{is} \mathrm{the} \mathrm{unit} \mathrm{of} \mathrm{pressure}.$

The stress and Young's modulus have the same units as that of pressure.

 $Angular\mathit{ }momentum\mathit{ }\mathit{=}\mathit{ }mvr$
     $Joule\text{}-\text{}s$

Watt is a unit of power

$1lightyear=9.46\times {10}^{15}meter$

$V=\frac{W}{m}$ so, SI unit = $\frac{Joule}{kg}$

$N{m}^{-1}$

$n_2=n_1{\left(\frac{M_1}{M_2}\right)}^1{\left(\frac{L_1}{L_2}\right)}^1{\left(\frac{T_1}{T_2}\right)}^{-2}$

= $100{\left(\frac{gm}{kg}\right)}^1{\left(\frac{cm}{m}\right)}^1{\left(\frac{\sec }{min}\right)}^{-2}$

= $100{\left(\frac{gm}{{10}^{3}gm}\right)}^1{\left(\frac{cm}{{10}^{2}cm}\right)}^1{\left(\frac{\sec }{60\sec }\right)}^{-2}$

n₂ = $\frac{3600}{{10}^3}=3.6$

$[L\text{}/\text{}R]$ is a time constant so its unit is Second.