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

Question # 1

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 # 2

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 # 3

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 # 4

The efficiency of half wave rectifier is:

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

Question # 5

The junction potential for Germanium is;

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

Question # 6

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 # 7

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 # 8

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 # 9

The unit of gain (G) for non-inverting amplifier is

Ampere A
ohm B
Volt C
None of these D

Question # 10

The diodes works on

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

Question # 11

A non-conducting semiconductor diode is:

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

Question # 12

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 # 13

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

Question # 14

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 # 15

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 # 16

Gain of operational amplifier is independent of;

Internal structure A
External Structure B
Batteries C
Potential changes D

Question # 17

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 # 18

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 # 19

The diode charactristics curve is plot between

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

Question # 20

In a full wave rectifier with input frequency 50Hz. The frequency of pulsating D)C) received as an output across the load is

50 Hz A
100 Hz B
500 Hz C
zero D

Sr.#	Question	Answer
1	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
2	In a full wave rectifier with input frequency 50Hz. The frequency of pulsating D)C) received as an output across the load is	A. 50 Hz B. 100 Hz C. 500 Hz D. zero
3	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
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	A non-conducting semiconductor diode is:	A. Forward biased B. Poorly biased C. Reverse biased D. None of them
6	The efficiency of half wave rectifier is:	A. 25.6% B. 1.2% C. 40.6% D. 66.6%
7	The diodes works on	A. A.C B. D.C C. both A and B D. None of these
8	A diode characteristics curve is a graph plotted between;	A. Current and time B. Voltage and time C. Voltage and current D. Forward voltage and reverse current
9	Gain of operational amplifier is independent of;	A. Internal structure B. External Structure C. Batteries D. Potential changes
10	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

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