A lens of power +5 D is put in contact with a lens of power -3 D . The combination will behave like a
convergent lens of focal length 75 cm .
divergent lens of focal length 16 cm .
convergent lens of focal length 50 cm .
divergent lens of focal length 40 cm .
A glass capillary of radius 0.35 mm is inclined at $60^{\circ}$ with the vertical in water. The length of water column in the capillary tube is (surface tension of water $=7 \times 10^{-2} \mathrm{Nm}^{-1}$, acceleration due to gravity $=10 \mathrm{~m} / \mathrm{s}^2, \cos 0^{\circ}=1$, $\cos 60^{\circ}=0.5$, density of water $=1 \mathrm{gram} / \mathrm{cm}^3$ )
16 cm
4 cm
8 cm
0.8 cm
In a given circuit, AB is a uniform potentiometer wire. If the value of resistance ' $R$ ' is slightly increased, the balance point

shifts towards $B$
shifts towards A
will not change
will not be obtained
In common emitter configuration, $\beta, \mathrm{R}_{\mathrm{L}}$ and r are the a.c. current gain, load resistance and the input resistance of a transistor respectively. The voltage and power gain respectively are
$\beta \frac{r}{R_L}, \beta^2 \frac{r}{R_L}$
$\beta \frac{\mathrm{r}}{\mathrm{R}_{\mathrm{L}}}, \beta\left(\frac{\mathrm{r}}{\mathrm{R}_{\mathrm{L}}}\right)^2$
$\beta \frac{R_L}{r}, \beta^2 \frac{R_L}{r}$
$\beta \frac{R_L}{r}, \beta\left(\frac{R_L}{r}\right)^2$
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