NEET Practice Questions (MCQs) with Answers & Solutions

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

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

The size of the nucleus is of the order of 1 fermi-meter.

 $\mathrm{Mach} \mathrm{number}=\frac{\text{Velocity of object}}{\text{Velocity of sound}}=\frac{332}{332}=1$

$E=-\frac{dV}{dx}$

$\mathrm{Pressure}=\frac{\mathrm{F}}{\mathrm{A}}=\frac{\mathrm{N}}{{\mathrm{m}}^2}$

Surface tension = $\frac{\text{Force}}{\text{Length}}$ = $Newtons/metre$

$L=\frac{\phi }{I}=\frac{Wb}{A}=Henry$.

$$\begin{gathered} \mathrm{E}=\frac{\mathrm{Li}}{\mathrm{t}} \Rightarrow \mathrm{L}=\frac{\mathrm{Et}}{\mathrm{i}} \\ \mathrm{R}=\frac{\mathrm{E}}{\mathrm{i}} \Rightarrow \frac{\mathrm{L}}{\mathrm{R}}=\mathrm{t} \end{gathered}$$

$\frac{L}{R}$ is a time constant of L-R circuit so Henry/ohm can be expressed as second.

$mv=kg\left(\frac{m}{\sec }\right)$

Quantities of similar dimensions can be added or subtracted so unit of a will be same as that of velocity.