Question: 1 -

The depletion layer across a p⁺ - n junction lies ,

Entirely in the p⁺ region

Mostly in the n region

Mostly in the p⁺ region

Equally in both the p⁺ and n region

Answer:

Mostly in the n region

Solution:

In p⁺ n junction , depletion layer will lie mainly in n region

Question: 2 -

At the valley voltage (Vv) what is the value of conductance in a tunnel diode :

Infinite

Some negative value

Some positive value

Zero

Answer:

Zero

Solution:

At the valley voltage the conductance of a tunnel diode is zero , because slope of I-V curve is zero at valley point for tunnel diode

Question: 3 -

Consider the following statements :-

The threshold voltage of a MOSFET can be lowered by

(i) Using a thinner gate oxide

(ii) Reducing the substrate concentration

(iii) Increasing the substrate concentration

of these statements

ii and i are correct

only ii is correct

only iii is correct

iii and ii are correct

Answer:

ii and i are correct

Solution:

Vt can be lowered by reducing oxide thickness and by reducing substrate doping

Question: 4 -

Which of the following capacitors are used widely for a capacitance application in monolithic IC's ?

(i) MOS capacitor

(ii) Collector - substrate capacitor

(iii) Collector - base capacitor

(iv) Base - Emitter capacitor

Select the correct answer using the code given below:

ii and i

ii and iii

iii and iv

iv and i

Answer:

ii and i

Solution:

MOS capacitor and collector substrate capacitor are widely used

Question: 5 -

In an integrated circuit , the SiO₂ layer provides

Electrical connection to external circuit

Conducting path

Isolation

Physical strength

Answer:

Isolation

Solution:

SiO2 layer is used as insulator