1
MCQ (Single Correct Answer)

AIPMT 2003

A n-p-n transistor conducts when
A
both collector and emitter are positive with respect to the base
B
collector is positive and emitter is negative with respect to the base
C
collector is positive and emitter is at same potential as the base
D
both collector and emitter are negative with respect to the base

Explanation

When the collector is positive and emitter is negative with respect to base, it causes the forward biasing for each junction, which causes conduction of current.
2
MCQ (Single Correct Answer)

AIPMT 2003

Reverse bias applied to a junction diode
A
lowers the potential barrier
B
raises the potential barrier
C
increases the majority carrier current
D
increases the minority carrier current

Explanation

In reverse bias, the size of the depletion region increases thereby increasing the potential barrier.
3
MCQ (Single Correct Answer)

AIPMT 2002

For the given circuit of p-n junction diode which is correct

A
in forward bias the voltage across R is V
B
in reverse bias the voltage across R is V
C
in forward bias the voltage across R is 2V
D
in reverse bias the voltage across R is 2V.

Explanation

In forward biasing, the resistance of p-n junction diode is very low to the flow of current. So practically all the voltage will be dropped across the resistance R, i.e. voltage across R will be V.

In reverse biasing, the resistance of p-n junction diode is very high. So the voltage drop across R is zero.
4
MCQ (Single Correct Answer)

AIPMT 2002

The given truth table is for which logic gate

              $$\matrix{ A & B & Y \cr 1 & 1 & 0 \cr 0 & 1 & 1 \cr 1 & 0 & 1 \cr 0 & 0 & 1 \cr } $$
A
NAND
B
XOR
C
NOR
D
OR.

Explanation

This truth table represents NAND gate.

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