NEET (UG)

Practice Test 1 — Semiconductor Electronics

12 questions • 18 minutes • auto-graded with full solutions

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Section A — MCQ (Single Correct)

Question 1

In an intrinsic semiconductor, the number of free electrons:

Solution: $n_e = n_h$ for intrinsic.

Question 2

Doping with a trivalent impurity gives a:

Solution: Trivalent dopant to p-type.

Question 3

The majority carriers in an n-type semiconductor are:

Solution: Electrons are the majority carriers in n-type.

Question 4

A forward-biased p-n junction has:

Solution: Forward bias gives low resistance.

Question 5

A full-wave bridge rectifier uses:

Solution: Four diodes in a bridge.

Question 6

A Zener diode is used as a:

Solution: Zener regulates voltage in reverse breakdown.

Question 7

An AND gate gives output 1 when:

Solution: AND needs all inputs 1.

Question 8

The universal gates are:

Solution: NAND and NOR are universal.

Section B — Assertion & Reason

Question 9

A: The conductivity of a semiconductor increases with rising temperature.
R: Thermal energy creates additional electron-hole pairs in the semiconductor.

Solution: More carriers from heating raise conductivity — R explains A.

Question 10

A: A p-n junction diode conducts appreciably in only one direction.
R: Forward bias lowers the potential barrier while reverse bias raises it.

Solution: Lowered barrier (forward) allows current; raised barrier (reverse) blocks it — R explains A.

Question 11

A: An n-type semiconductor carries a net negative charge.
R: It contains more free electrons than holes.

Solution: An n-type semiconductor is electrically neutral overall, so A is false; it does have more free electrons than holes, so R is true.

Question 12

A: Any digital circuit can be constructed using only NAND gates.
R: NAND is a universal gate.

Solution: Being universal means NAND alone can build any circuit — R explains A.