# Drift and Diffusion Current MCQ’s

This set of Analog Electronic Circuits Multiple Choice Questions & Answers (MCQs) focuses on “Drift and Diffusion Current”.

1. Diffusion current is due to ___________
a) Applied electric field over a given distance
b) Variation in carrier concentration
c) Random motion of holes
d) Recombination of holes and electrons

2. What makes up the total current in a semi-conductor?
a) Only diffusion current
b) Only drift current
c) Drift+diffusion current
d) Drift+diffusion+biasing current

3. Drift current is due to ___________
a) Applied electric field over a given distance
b) Random motion of electrons
c) Random motion of holes
d) Recombination of holes and electrons

4. Conductors also have drift current.
a) True
b) False

5. Is the statement “Diffusion current produces Drift current” true?
a) Yes
b) No
c) Cannot Say
d) Insufficient Data

6. What is mobility?
a) Ease of carrier drift
b) Ease of current flow
c) Ease of access to the junction
d) Ease of movement

7. The equation Jn=qnµnE (A/cm2) represents___________
a) Drift current
b) Drift current density
c) Diffusion current
d) Diffusion current density

8. What is the average net velocity in the direction of the electric field?
a) Velocity of electrons
b) Velocity of holes
c) Drift velocity
d) Collision velocity

9. Why does a gradient occur in a semi-conductor?
a) Because of current flow
b) Because of diffusion current
c) Because of drift current
d) Because of difference in concentrations

10. How does diffusion current produce the depletion region?
a) The diffusion causes the holes and electrons to collect at the junction
b) The diffusion is because of the depletion region
c) The depletion region aids diffusion
d) The statement is not true