The truth table given below is for (A and B are the inputs, Y is the output)

• NOR

• AND

• XOR

• NAND

In an unbiased p-n junction

• Potential at p is more than that at n

• Potential at p is less than that at n

• Potential at p is equal to that at n

• Potential at p is +ve and that at n is −ve

103.

To get an output Y = 1 from the circuit shown, the inputs A, B and C must be respectively

          

• 0, 1, 0

• 1, 0, 0

• 1, 0, 1

• 1, 1, 0

In a common emitter amplifier the input signal is applied across

• anywhere

• emitter-collector

• collector-base

• base-emitter

In the following combinations of logic gates, the outputs of A, B and C are respectively

• 0, 1, 1

• 0, 1, 0

• 1, 1, 0

• 1, 0, 1

The forbidden energy gap in Ge is 0.72 eV, Given, hc = 12400 eV-$\stackrel{\circ }{\mathrm{A}}$ . The maximum wavelength of radiation that will generate electron hole pair is

• $172220 \stackrel{\circ }{\mathrm{A}}$

• $172.2 \stackrel{\circ }{\mathrm{A}}$

• $17222 \stackrel{\circ }{\mathrm{A}}$

• $1722 \stackrel{\circ }{\mathrm{A}}$

In a p-n junction diode not connected to any circuit

• the potential is the same everywhere

• the p-type side has a higher potential than the n-type side

• there is an electric field at the junction directed from the n-type side to p-type side

• there is an electric field at the junction directed from the p-type side to n-type side

Identify the logic operation performed by the circuit given here.

• OR

• NOR

• NOT

• NAND

An n-p-n transistor can be considered to be equivalent to two diodes, connected. Which of the following figure is the correct one ?

In the case of forward biasing of a p-n junction diode, which one of the following figures correctly depicts the direction of conventional current (indicated by an arrow mark) ?