Semiconductor Physics - NEET Physics Questions
← All Chapters

Semiconductor Physics

Practice Questions:
Question 41: easy

The dominant mechanism for motion of charge carriers in forward and reverse biased silicon P-N junction are :

1. Drift in forward bias, diffusion in reverse bias
2. Diffusion in forward bias, drift in reverse bias
3. Diffusion in both forward and reverse bias
4. Drift in both forward and reverse bias
View Answer

Theory: In forward biased mode diffusion current is more than drift current. Where as in reverse biased mode diffusion current decreased and become less than drift current.

💬 Discuss this Question
Question 42: easy

In the given circuit

The current through the battery is :

1. 0.5 A
2. 1 A
3. 1.5 A
4. 2 A
View Answer

Diode D2 and D3 are forward biased. Where as Diode D1 is reversed biased. No current will flow through D1. 

Equivalent Resistance= 20/3 ohm

Current = Voltage / Resistance = 10/ (20/3) = 1.5 Ampere

💬 Discuss this Question
Question 43: easy

Phodiode, zenerdiode and solar cell is used in:

1. Forward Bias, Reverse Bias, Forward Bias
2. Reverse Bias, Reverse Bias, Unbiased
3. Reverse Bias, UnBias, Reverse Bias
4. Reverse Bias, Reverse Bias, Reverse Bias
View Answer

A Photodiode and Zener Diode operate in Reverse Bias, while a Solar Cell operates in an Unbiased condition (zero external voltage).

  • Photodiode: Works in reverse bias to detect light.
  • Zener Diode: Operates in reverse bias for voltage regulation.
  • Solar Cell: Generates power in an unbiased condition when exposed to light.
💬 Discuss this Question