MHT CET 2025 22nd April Morning Shift | Semiconductor Devices and Logic Gates Question 7 | Physics

In a pure silicon crystal electron-hole concentration is $10^{16}$ per $\mathrm{m}^3$ at 301 K . Now $10^{21}$ atoms of phosphorus are added per cubic metre. The new hole concentration in silicon is (in per $\mathrm{m}^3$ )

$10^5$

$10^{11}$

$10^{19}$

$10^{21}$

MHT CET 2025 22nd April Morning Shift

MCQ (Single Correct Answer)

-0

In a common emitter transistor amplifier, the output voltage and input voltage have a phase difference of

$0^c$

$\frac{\pi^c}{2}$

$\frac{3 \pi^{\circ}}{4}$

$\pi^{\mathrm{c}}$

MHT CET 2025 22nd April Morning Shift

MCQ (Single Correct Answer)

-0

If a centre tap transformer is used with two p-n junction diodes for full wave rectification then output voltage of rectifier with respect to each diode is (secondary voltage of transformer $=\mathrm{V}_{\mathrm{s}}$ )

$2 \mathrm{~V}_{\mathrm{s}}$

$\left(\frac{2}{3}\right) \mathrm{V}_{\text {s }}$

$\left(\frac{1}{2}\right) \mathrm{V}_{\mathrm{s}}$

$\left(\frac{3}{2}\right) \mathrm{V}_{\mathrm{s}}$

MHT CET 2025 22nd April Morning Shift

MCQ (Single Correct Answer)

-0

If an alternating voltage is applied across a p-n junction diode in series with a load then

no voltage appears across load.

a pulsating voltage appears across load.

an a.c. voltage appears across load.

a d.c. voltage appears across load which is not pulsating.

PREVIOUS NEXT

MHT CET Subjects