12th Class Physics MCQS Chapter 7

Which one has greater cone of impurity among all:

All are pure

Collector

Base

Emitter

The potential difference across depletion region in case of Si is

0.2 volt

0.6 volt

0.7 volt

0.9 volt

When transistor are used in digital circuits they usually operate in the :

Saturation & cutoff regions

Break down region

Active region

Linear region

OR gate is represented by:

X=A.B

X=A.B

X = A+B

X=A+B

In case of reverse biasing, current is flown due to:

Majority charge carriers

Minority charge carriers

Electrons

Protons

In an N-type silicon, which of the following statement is true?

Holes are minority carriers & pentavalent atoms are the dopants.

Electrons are majority carriers & trivalent atoms are the dopants

Holes are minority carriers & trivavalent atoms are the dopants.

Electrons are majority carriers & pentavalent atoms are the dopants

In case of op-amp as an inverting amplifier, V₊ – V_– = 0, this is because

Open loop gain is very high

Both (a) and (a)

Closed loop gain is very high

Open gain loop is very low

The gate, which changes the logic level to its opposite level is called

OR gate

NOT gate

NOR gate

AND gate

For normal transistor the emitter current can be given by

I_E = I_C + I_B

I_E = I_B

None of these

I_E = I_C

A transistor has parts:

4

5

3

2