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

Question # 1

Gain of operational amplifier is independent of;

Internal structure A
External Structure B
Batteries C
Potential changes D

Question # 2

In full wave rectification by bridge the number of diodes required are

3 A
4 B
2 C
5 D

Question # 3

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 # 4

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 # 5

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 # 6

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 # 7

The efficiency of half wave rectifier is:

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

Question # 8

The junction potential for Germanium is;

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

Question # 9

The magnitude of potential barrier for Ge is

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

Question # 10

A circuit that converts Pulsating DC into smooth DC contain :

Filter A
Capacitor B
Inductor C
LC circuit D

Question # 11

The efficiency of full wave rectifier is:

25.6% A
81.2% B
81.6% C
71.2% D

Question # 12

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 # 13

The power output of a full wave rectifier is:

Equal to H.W.R A
Twice of H.W.R B
Half of H.W.R C
Four times of H.W.R D

Question # 14

For a normal AC cycle, during T/2 to T the diode act as:

Open switch A
full wave rectifier B
Close switch C
All are correct D

Question # 15

A certain noninverting amplifier has R1 of 1 kΩ and R2 of 100 kΩ. The closed-loop voltage gain is ………

100,000 A
100 B
1000 C
101 D

Question # 16

A PN junction diode cannot be use:

As rectifier A
For converting light energy to electrical energy B
For getting light radiation C
For increasing the amplitude of an ac signal D

Question # 17

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 # 18

A non-conducting semiconductor diode is:

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

Question # 19

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 # 20

The simplest type of rectification known as half wave rectification is obtained by

Using a transistor A
Suppressing the harmonics in A.C. voltage B
Suppressing half wave of A.C. supply by using diode C
Using a Coolidge D

Sr.#	Question	Answer
1	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
2	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
3	The simplest type of rectification known as half wave rectification is obtained by	A. Using a transistor B. Suppressing the harmonics in A.C. voltage C. Suppressing half wave of A.C. supply by using diode D. Using a Coolidge
4	The power output of a full wave rectifier is:	A. Equal to H.W.R B. Twice of H.W.R C. Half of H.W.R D. Four times of H.W.R
5	For a normal AC cycle, during T/2 to T the diode act as:	A. Open switch B. full wave rectifier C. Close switch D. All are correct
6	For full wave rectification, the minimum number of diodes used is:	A. 1 B. 2 C. 3 D. 4
7	The efficiency of half wave rectifier is:	A. 25.6% B. 1.2% C. 40.6% D. 66.6%
8	A diode as a rectifier converts:	A. A)c into D)c B. D)c into A)c C. Varying D)c current into constant D)c current D. High voltage into low voltage and vice-versa
9	A non-conducting semiconductor diode is:	A. Forward biased B. Poorly biased C. Reverse biased D. None of them
10	A PN junction diode cannot be use:	A. As rectifier B. For converting light energy to electrical energy C. For getting light radiation D. For increasing the amplitude of an ac signal

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