Physics MCQs for NEET — Practice Questions with Answers

Angular acceleration $=\frac{\text{Angular velocity}}{\text{Time}}=\frac{rad}{{\sec }^2}$

Kg-m/sec is the unit of linear momentum

$c{t}^2$ must have dimensions of L

$\Rightarrow$c must have dimensions of $L/T^2$ i.e. $L{T}^{-2}$

Angular momentum = Distance X Mass X Velocity

                              = $\left[\mathrm{L}\right]\times \left[\mathrm{M}\right]\times \left[{\mathrm{LT}}^{-1}\right]$

                               = $\left[{\mathrm{ML}}^2{\mathrm{T}}^{-1}\right]$

                                 $$\begin{gathered} = \left[{\mathrm{ML}}^2{\mathrm{T}}^{-2 }\right]X \left[\mathrm{T}\right] \\ =Joule X sec \end{gathered}$$

The unit of energy in SI system is Joule.

$6\times {10}^{-5}=60\times {10}^{-6}=60microns$

Because temperature is a fundamental quantity.

The unit of power is Kilowatt.

$$\begin{gathered} 1 cgs unit = 1\frac{g}{c{m}^3} \\ =\frac{{\displaystyle \frac{1kg}{1000}}}{{\left({\displaystyle \frac{1m}{100}}\right)}^3} ={10}^3 kg/m^3 \end{gathered}$$
1 C.G.S unit of density = 1000 M.K.S. unit of density

$\Rightarrow 0.5\text{\hspace{0.17em}}gm\text{}/\text{}cc=500kg\text{}/\text{}{m}^3$