The solubility product of $\mathrm{PbI}_2$ is $2.8 \times 10^{-8}$. Calculate its solubility in $\mathrm{mol} \mathrm{dm}^{-3}$.
$1.323 \times 10^{-3}$
$1.912 \times 10^{-3}$
$7.912 \times 10^{-3}$
$7.323 \times 10^{-23}$
When forward bias is applied to a p-n junction, then the potential barrier and the width of the depletion region respectively.
increases, increases.
decreases, increases.
increases, decreases.
decreases, decreases.
Four solid spheres each of mass ' $m$ ' and radius ' $r$ ' are arranged as shown in the figure. The moment of inertia of the system about the given axis of rotation $\mathrm{AA}^1$ is

$\frac{13}{5} \mathrm{mr}^2$
$\frac{16}{5} \mathrm{mr}^2$
$\frac{18}{5} \mathrm{mr}^2$
$\frac{21}{5} \mathrm{mr}^2$
A wave is travelling in the negative x direction having displacement 3 cm along Y direction, wavelength $2 \pi \mathrm{~m}$ and frequency $\left(\frac{1}{2 \pi}\right) \mathrm{Hz}$ is represented as ( $t=$ time)
$3 \sin (\mathrm{x}+\mathrm{t}) \mathrm{m}$
$3 \times 10^{-2} \sin (x+t) m$
$3 \sin (x+2 t) m$
$3 \times 10^{-3} \sin (x+2 t) \mathrm{m}$
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