In Young's double slit experiment, waves from slits ' $\mathrm{S}_1$ ' and ' $\mathrm{S}_2$ ' have a path difference of $\frac{\lambda}{4}$ and $\frac{\lambda}{6}$ respectively at points $x$ and $y$ on the screen. The ratio of intensities at points $y$ to that at $x$ is $\left(\cos 45^{\circ}=\frac{1}{\sqrt{2}}, \cos 30^{\circ}=\sqrt{3} / 2,\right)$
$1: 3$
$3: 2$
$3: 4$
$2: 3$
The angular separation between the minute hand and the hour hand of clock 40 minutes passed after $12 \mathrm{p} . \mathrm{m}$. is
$120^{\circ}$
$110^{\circ}$
$90^{\circ}$
$220^{\circ}$
For a p-type semiconductor, the relation between the number density ' $\mathrm{n}_{\mathrm{h}}$ ' and ' $\mathrm{n}_{\mathrm{e}}$ ' is
$\mathrm{n}_{\mathrm{e}}=\mathrm{n}_{\mathrm{h}}$
$n_h \gg n_e$
$\mathrm{n}_{\mathrm{h}} \ll \mathrm{n}_{\mathrm{e}}$
$\mathrm{n}_{\mathrm{h}}=\mathrm{n}_{\mathrm{e}}=0$
If 80 J of work is required in moving an electric charge of ' 2 C ' from a point where potential is " -8 V ' to another point where potential is ' $V$ ' volt, the value of ' $V$ ' is
8 V
16 V
32 V
40 V
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