NEET Electronic Devices — Set 9

Question 1

The conductivity of an extrinsic semiconductor increases due to:

Accepted Answer

Doping introduces impurities (pentavalent or trivalent) that provide additional charge carriers (electrons or holes), significantly enhancing conductivity compared to intrinsic semiconductors.

Question 2

The direction of conventional current in a forward-biased diode is:

Accepted Answer

In forward bias, current flows from p-side (positive) to n-side (negative) conventionally, as indicated by the diode symbol’s arrow, due to the flow of majority carriers.

Question 3

Which property distinguishes insulators from semiconductors?

Accepted Answer

Insulators have a large energy gap ($ E_g > 3 \, \text{eV} $), preventing electron excitation, while semiconductors have a smaller gap ($ 0.2 \, \text{eV} $ to $ 3 \, \text{eV} $), allowing some conduction.

NEET Physics: Electronic Devices — Practice Set 9

Q1. The conductivity of an extrinsic semiconductor increases due to:

Q2. The direction of conventional current in a forward-biased diode is:

Q3. Which property distinguishes insulators from semiconductors?

Q4. The thickness of the depletion region in a p-n junction is typically:

Q5. The negative space-charge region in a p-n junction is located on:

Q6. The current in a forward-biased p-n junction diode is primarily due to:

Q7. A germanium diode has a threshold voltage of approximately:

Q8. In a p-n junction, the positive space-charge region is located on:

Q9. The number of valence electrons in Si and Ge atoms is:

Q10. In a rectifier with a capacitor filter, the capacitor discharges through: