Directions: Each question contains STATEMENT-1 and STATEMENT-2. Choose the correct answer(ONLY ONE option is correct ) from the following-

Statement-1 :NAND or NOR gates are called digital building blocks.

Statement-2 :The repeated use of NAND (or NOR) gates can produce all the bas is or complicated gates.

(a)Statement -1 is true, Statement-2 is true;Statement -2 is a correct explanation for Statement-1
(b)Statement -1 is true, Statement-2 is true; Statement -2 is not a correct explanation for Statement-1
(c)Statement -1 is true, Statement-2 is false
(d)Statement -1 is false, Statement-2 is true

Solution

(a)Statement -1 is true, Statement-2 is true;Statement -2 is a correct explanation for Statement-1

These gates are called digital building blocks because using these gates only (either NAND or NOR) we can compile all other gates also(like OR, AND, NOT,XOR)

Which of the following is unipolar transistor?

p– n– ptransistor
n– p– ntransistor
Field effect transistor
Point contact transistor

Solution

Field effect tansistor is unipolar in nature because in this either holes or electrons are present. But in case of BJT both holes and electrons are present due to which they arebipolar in nature.

A TV tower has a height of 100 m. How much population is covered by the TV broadcast if the average population density around the tower is 1000 km^-2 ? (radius of the earth= 6.37 × 10⁶m)

4 lakh
4 billion
40,000
40 lakh

Solution

An oscillator is nothing but an amplifier with

positive feedback
large gain
no feedback
negative feedback

The output(X) of the logic circuit shown in figure will be

\(X=\overline{A.B}\)
\(X=A.B\)
\(X=\overline{A+B}\)
\(X=a\times b\)

Solution

In a common emitter (CE) amplifier having a voltage gain G,the transistor used has trans conductance 0.03 mho and current gain 25. If the above transistor is replaced with another one with trans conductance 0.02 mho and current gain 20, the voltage gain will be

1.5 G
¹⁄₃ G
⁵⁄₄ G
²⁄₃ G

Solution

In a n-type semiconductor, which of the following statement is true?

Electrons are minority carriers and pentavalent atoms are dopants.
Holes are minority carriers and pentavalent atoms are dopants.
Holes are majority carriers and trivalent atoms are dopants.
Electrons are majority carriers and trivalent atoms are dopants.

Solution

In a n-type semiconductor holes are minority carriers and pentavalent atoms are dopants.

The input resistance of a silicon transistor is 100 W.Base current is changed by 40 mA which results in a change in collector current by 2mA. This transistor is used as a common emitter amplifier with a load resistance of 4KW. The voltage gain of the amplifier is

2000
3000
4000
1000

Solution

The figure shows a logic circuit with two inputs A and B and the output C. The voltage wave forms across A, B and C are as given. The logic gate circuit is:

OR gate
NOR gate
AND gate
NAND gate

Solution

Transfer characteristics [output voltage (V₀) vs input voltage (V₁)] for a base biased transistor in CE configuration is as shown in the figure.For using transistor as a switch, it is used

in region (III)
both in region (I) and (III)
in region (II)
in region (I)

Solution

I → ON

II → OFF

In II^nd state it is used as a amplifier it is active region.

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