An ideal gas in a container of volume 500 cc is at a pressure of $2 \times 10^5 \mathrm{~N} / \mathrm{m}^2$. The average kinetic energy of each molecule is $6 \times 10^{-21} \mathrm{~J}$. The number of gas molecules in the container is
$5 \times 10^{25}$
$5 \times 10^{23}$
$25 \times 10^{23}$
$2.5 \times 10^{22}$
Out of the following graphs, the correct graphical relation for LC parallel resonant circuit at resonance is

D
C
B
A
A small steel ball of mass ' M ', radius ' R ' and density ' $\rho$ ' falls with terminal velocity through a tube filled with glycerine of density ' $\sigma$ '. The viscous force acting on the steel ball is ( $\mathrm{g}=$ acceleration due to gravity)
$\mathrm{Mg} \frac{\rho}{\sigma}$
$\mathrm{Mg}(\mathrm{Q}-\sigma)$
$\mathrm{Mg} \rho \sigma$
$M g\left(1-\frac{\sigma}{\rho}\right)$
If the electric flux entering and leaving an enclosed surface area are ' $\phi_1$ ' and ' $\phi_2$ ' respectively, the electric charge inside the surface will be ( $\varepsilon_0=$ permittivity of free space)
$\quad \varepsilon_0\left(\phi_1-\phi_2\right)$
$\quad \varepsilon_0\left(\phi_2-\phi_1\right)$
$\frac{\left(\phi_1+\phi_2\right)}{2}$
$\frac{\left(\phi_1-\phi_2\right)}{2}$
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