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

Question # 1

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 # 2

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 # 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

The diode charactristics curve is plot between

I & t A
V& t B
V& I C
None D

Question # 5

The magnitude of potential barrier for Ge is

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

Question # 6

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 # 7

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 # 8

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 # 9

A non-conducting semiconductor diode is:

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

Question # 10

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 # 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

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 # 14

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

Question # 15

A device which convert DC into AC is calleD)

Invertor A
Generator B
Rectifier C
Motor D

Question # 16

A circuit that converts Pulsating DC into smooth DC contain :

Filter A
Capacitor B
Inductor C
LC circuit D

Question # 17

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 # 18

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 # 19

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 # 20

In a half wave rectifier circuit operating from 50 Hz mains frequency, the fundamental frequency in the ripple would be:

25 Hz A
70.7 Hz B
50 Hz C
100 Hz D

Sr.#	Question	Answer
1	A device which convert DC into AC is calleD)	A. Invertor B. Generator C. Rectifier D. Motor
2	A pulsating DC can be converted into constant voltage by using	A. Filter B. Full wave rectifier C. Half wave rectifie D. Bridge rectifier
3	The magnitude of potential barrier for Ge is	A. 0.7 v B. 0.3 V C. 7v D. 3 v
4	A non-inverting amplifier has infinite input resistance then the voltage gain of noninverting amplifier will be:	A. Zero B. Infinite C. One D. 100
5	In full wave rectification, the output DC voltage across the load is obtained for.	A. The positive half cycle of input AC only B. The negative half cycle of input AC C. The completes cycle of input AC only D. All of the above
6	The efficiency of full wave rectifier is:	A. 25.6% B. 81.2% C. 81.6% D. 71.2%
7	For full wave rectification, the minimum number of diodes used is:	A. 1 B. 2 C. 3 D. 4
8	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
9	The diode charactristics curve is plot between	A. I & t B. V& t C. V& I D. None
10	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

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