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

1. $X=\stackrel{=}{A}·\stackrel{=}{B}$

2. $X=\overline{A.B}$

3. $X=A·B$

4.$\mathrm{<mspace\; width="1em"></mspace>X}=\overline{A+B}$

C and Si both have same lattice structure,having 4 bonding electrons in each.However, C is insulator whereas Si is intrinsic semiconductor. This is because 

1. in case of C, the valence band is not completely filled at absolute zero temperature

2. in case of C,the condition band is partly filled even at absolute zero temperature 

3. the four bonding electrons in the case of C lie in the second orbit,Whereas in the case of Si they lie in the third

4 .the four bonding electrons in the case of C lie in the third orbit, whereas for Si they lie in the fourth orbit

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 circuit gate is 

1. OR gate                                         
2. NOR gate
3. AND gate                                       
4. NAND gate

The input resistance of a silicon transistor is

100 $\mathrm{\Omega }$. Base current is changed by 40 $\mathrm{\mu A}$

which results in a change in collector current

by 2 mA. This transistor is used as a common-

emitter amplifier with a load resistance of 4 k$\mathrm{\Omega }$.

The voltage gain of the amplifier is

1. 2000

2. 3000

3. 4000

4. 1000

Symbolic representation of four logic gates

are shown as

(i) 

(ii) 

(iii) 

(iv) 

Pick out which ones are for AND, NAND and 

NOT gates, respectively.

1. (iii), (ii)and (i)

2. (iii), (ii) and (iv)

3. (ii), (iv) and (iii)

4. (ii), (iii) and (iv)

If a small amount of antimony is added to germanium crystal

1. the antimony becomes an acceptor atom

2. there will be more free electrons than holes in the semiconductor

3. its resistance is increased

4. it becomes a p-type semiconductor

In forward biasing of the p-n junction 

In the following figure, the diodes which are forward biased, are

(I)
(II)
(III)
(IV)

Choose the correct option from the given ones:

A Zener diode, having breakdown voltage equal to \(15\) V, is used in a voltage regulator circuit, as shown in the figure. The current through the diode is:

                      
1. \(10\) mA
2. \(15\) mA
3. \(20\) mA
4. \(5\) mA