MDCAT Physics mcq test with answers for chapter 14 (Electronics)

Question # 1

When two semiconductors of p- and n-type are brought into contact, they from a p-n junction which act like a:

Conductor A
Amplifier B
Oscillator C
Rectifier D

Question # 2

Gain of operational amplifier is independent of;

Internal structure A
External Structure B
Batteries C
Potential changes D

Question # 3

The magnitude of potential barrier for Ge is

0.7 v A
0.3 V B
7v C
3 v D

Question # 4

Inverting amplifier circuits have

A very high input impendance A
A very low input impendance B
A low output impendance C
Both A and C D

Question # 5

A diode characteristics curve is a graph plotted between;

Current and time A
Voltage and time B
Voltage and current C
Forward voltage and reverse current D

Question # 6

The diodes works on

A.C A
D.C B
both A and B C
None of these D

Question # 7

In full wave rectification, the output DC voltage across the load is obtained for.

The positive half cycle of input AC only A
The negative half cycle of input AC B
The completes cycle of input AC only C
All of the above D

Question # 8

In a full wave rectifier, the diode conducts during

Both halves of the input cycle A
A portion of the positive half cycle of the input B
Positive half cycle of the input C
Positive half cycle of the input D
Both halves of the input cycle E

Question # 9

A pure semiconductor has:

An infinite resistance at 0^oC) A
A finite resistance which does not depend upon temperature B
A finite resistance which decreases with temperature C
A finite resistance which increase with temperature D

Question # 10

A pulsating DC can be converted into constant voltage by using

Filter A
Full wave rectifier B
Half wave rectifie C
Bridge rectifier D

Question # 11

The efficiency of half wave rectifier is:

25.6% A
1.2% B
40.6% C
66.6% D

Question # 12

The resistance of operational amplifier between inverting and non-inverting terminal is of the order of:

Few Ohms A
Mega Ohms B
Few Kilo Ohms C
Micro Ohms D

Question # 13

In a full wave rectifier:

DC current is twice that of half wave rectifier A
DC pulses are twice per cycle that of half wave rectifier B
DC voltage is twice that of half wave rectifier C
All are correct D

Question # 14

A diode as a rectifier converts:

A)c into D)c A
D)c into A)c B
Varying D)c current into constant D)c current C
High voltage into low voltage and vice-versa D

Question # 15

In full wave rectification, the output D.C. voltage across the load is obtainedfor

The positive half cycle of input A.C. (C) The complete cycle of input A.C. A
The negative half cycle of input A.C. B
The complete cycle of C
All of the above D

Question # 16

A non-conducting semiconductor diode is:

Forward biased A
Poorly biased B
Reverse biased C
None of them D

Question # 17

The method by which only one half of A.C cycle is converted into direct current is called

half wave amplification A
half wave rectification B
Full wave rectification C
full wave amplification D

Question # 18

For the same value of resistors the output of non-inverting amplifier compared to the output of inverting amplifier is, (ignoring phase difference)

Greater A
Equal B
Smaller C
Undefined D

Question # 19

A non-inverting amplifier has infinite input resistance then the voltage gain of noninverting amplifier will be:

Zero A
Infinite B
One C
100 D

Question # 20

A circuit that converts Pulsating DC into smooth DC contain :

Filter A
Capacitor B
Inductor C
LC circuit D

Sr.#	Question	Answer
1	The magnitude of potential barrier for Ge is	A. 0.7 v B. 0.3 V C. 7v D. 3 v
2	The method by which only one half of A.C cycle is converted into direct current is called	A. half wave amplification B. half wave rectification C. Full wave rectification D. full wave amplification
3	In a full wave rectifier, the diode conducts during	A. Both halves of the input cycle B. A portion of the positive half cycle of the input C. Positive half cycle of the input D. Positive half cycle of the input
4	Inverting amplifier circuits have	A. A very high input impendance B. A very low input impendance C. A low output impendance D. Both A and C
5	The diode charactristics curve is plot between	A. I & t B. V& t C. V& I D. None
6	For the same value of resistors the output of non-inverting amplifier compared to the output of inverting amplifier is, (ignoring phase difference)	A. Greater B. Equal C. Smaller D. Undefined
7	A pulsating DC can be converted into constant voltage by using	A. Filter B. Full wave rectifier C. Half wave rectifie D. Bridge rectifier
8	Gain of operational amplifier is independent of;	A. Internal structure B. External Structure C. Batteries D. Potential changes
9	In a half wave rectifier circuit operating from 50 Hz mains frequency, the fundamental frequency in the ripple would be:	A. 25 Hz B. 70.7 Hz C. 50 Hz D. 100 Hz
10	The resistance of operational amplifier between inverting and non-inverting terminal is of the order of:	A. Few Ohms B. Mega Ohms C. Few Kilo Ohms D. Micro Ohms

Latest Educational News Stories

Pakistan's Largest Database of Colleges and Universities

BS Programs

University Past Papers

University Results

Exam Results 2024

Study Abroad Programs and Opportunities for Pakistani Students

MDCAT Physics Chapter 14 MCQ Test With Answer for (Electronics)

MCQ's Test For MDCAT Physics Chapter 14 Electronics MCQ's Test

MDCAT Physics Chapter 14 Electronics MCQ's Test