NEET Electronic Devices — Set 3

Question 1

At absolute zero (0 K), an intrinsic semiconductor behaves as:

Accepted Answer

At 0 K, no thermal energy is available to excite electrons across the energy gap, so an intrinsic semiconductor has no free carriers and acts like an insulator.

Question 2

In an n-type semiconductor, the charge of the donor ion core is:

Accepted Answer

A pentavalent donor (e.g., P) donates one electron, leaving a positively charged ion core (+q) after ionization, balanced by the free electron’s negative charge.

Question 3

In a half-wave rectifier, the output voltage appears across the load during:

Accepted Answer

A half-wave rectifier conducts only during the positive half-cycle of the AC input, allowing current through the load only in that period, producing a pulsating output for half the cycle.

NEET Physics: Electronic Devices — Practice Set 3

Q1. At absolute zero (0 K), an intrinsic semiconductor behaves as:

Q2. In an n-type semiconductor, the charge of the donor ion core is:

Q3. In a half-wave rectifier, the output voltage appears across the load during:

Q4. The ripple in a rectifier output is reduced by using:

Q5. The conductivity of metals is high due to:

Q6. The output of a half-wave rectifier without a filter is:

Q7. The majority carriers in an n-type semiconductor are:

Q8. The dynamic resistance of a diode is defined as:

Q9. The reverse saturation current in a p-n junction diode is typically in the order of:

Q10. Which of the following materials has the highest resistivity?