Explore topic-wise MCQs in Testing Subject.

This section includes 657 Mcqs, each offering curated multiple-choice questions to sharpen your Testing Subject knowledge and support exam preparation. Choose a topic below to get started.

1.

*/*_In a bipolar transistor, the emitter base junction has?

A. Forward bias
B. Reverse bias
C. Zero bias
D. Zero or reverse bias
Answer» B. Reverse bias
Discussion
2.

*/*_As compared to bipolar junction transistor, a FET?

A. Is less noisy
B. Has better thermal stability
C. Has higher input resistance
D. All of the above
Answer» E.
Discussion
3.

*/*_Piezoelectric quartz crystal resonators find application where?

A. Signal amplification is required
B. Rectification of the signal is required
C. Signal frequency control is required
D. Modulation of signal is required
Answer» C. Signal frequency control is required
Discussion
4.

*/*_Hall effect is observed in a specimen when it is carrying current and is placed in a magnetic field. The resultant electric field inside the specimen is?

A. Normal to both current and magnetic field
B. In the direction of current
C. Antiparallel to magnetic field
D. In arbitrary direction
Answer» B. In the direction of current
Discussion
5.

*/*_An electron in the conduction band?

A. Has higher energy than the electron in the valence band
B. Has lower energy than the electron in the valence band
C. Loses its charge easily
D. Jumps to the top of the crystal
Answer» B. Has lower energy than the electron in the valence band
Discussion
6.

_ The dynamic resistance of a forward biased p-n diode$?

A. Varies inversely with current
B. Varies directly with current
C. Is constant
D. Is either constant or varies directly with current
Answer» B. Varies directly with current
Discussion
7.

_ Which of the following has highest resistivity?$?

A. Mica
B. Paraffin wax
C. Air
D. Mineral oil
Answer» D. Mineral oil
Discussion
8.

_ Light dependent resistors are$?

A. Highly doped semiconductor
B. Intrinsic semiconductor
C. Lightly doped semiconductor
D. Either A or B
Answer» D. Either A or B
Discussion
9.

_ In a semiconductor diode, the barrier offers opposition to$?

A. Holes in P-region only
B. Free electrons in N-region only
C. Majority carriers in both regions
D. Majority as well as minority carriers in both regions
Answer» D. Majority as well as minority carriers in both regions
Discussion
10.

_ Which of the following could be the maximum current rating of junction diode by 126?$?

A. 1 A
B. 10 A
C. 20 A
D. 100 A
Answer» B. 10 A
Discussion
11.

_ In which of these is reverse recovery time nearly zero?$?

A. Zener diode
B. Tunnel diode
C. Schottky diode
D. PIN diode
Answer» D. PIN diode
Discussion
12.

_ For a P-N diode, the number of minority carriers crossing the junction depends on$?

A. Forward bias voltage
B. Potential barrier
C. Rate of thermal generation of electron hole pairs
D. None of the above
Answer» D. None of the above
Discussion
13.

_In an ideal diode there is no breakdown, no __________ current, and no forward __________ drop.$?

A. Reverse, voltage
B. Forward, current
C. Forward, voltage
D. Reverse, current
Answer» B. Forward, current
Discussion
14.

_If too large current passes through the diode$?

A. All electrons will leave
B. All holes will freeze
C. Excessive heat may damage the diode
D. Diode will emit light
Answer» D. Diode will emit light
Discussion
15.

_How many free electrons does a p type semiconductor has?$?

A. Only those produced by thermal energy
B. Only those produced by doping
C. Those produced by doping as well as thermal energy
D. Any of the above
Answer» B. Only those produced by doping
Discussion
16.

_Assertion (A): A VMOS can handle much larger current than other field effect transistors.Reason (R): In a VMOS the conducting channel is very narrow.$?

A. Both A and R are true and R is correct explanation of A
B. Both A and R are true but R is not a correct explanation of A
C. A is true but R is false
D. A is false but R is true
Answer» D. A is false but R is true
Discussion
17.

_Which one of the following is not a characteristic of a ferroelectric material?$?

A. High dielectric constant
B. No hysteresis
C. Ferroelectric characteristic only above the curie point
D. Electric dipole moment
Answer» D. Electric dipole moment
Discussion
18.

Assertion (A): A JFET can be used as a current source.Reason (R): In beyond pinch off region the current in JFET is nearly constant.$?

A. Both A and R are true and R is correct explanation of A
B. Both A and R are true but R is not a correct explanation of A
C. A is true but R is false
D. A is false but R is true
Answer» B. Both A and R are true but R is not a correct explanation of A
Discussion
19.

A thermistor is a$?

A. Thermocouple
B. Thermometer
C. Miniature resistance
D. Heat sensitive explosive
Answer» D. Heat sensitive explosive
Discussion
20.

Assertion (A): In p-n-p transistor collector current is termed negative.Reason (R): In p-n-p transistor holes are majority carriers.$?

A. Both A and R are true and R is correct explanation of A
B. Both A and R are true but R is not a correct explanation of A
C. A is true but R is false
D. A is false but R is true
Answer» C. A is true but R is false
Discussion
21.

An intrinsic silicon sample has 1 million free electrons at room temperature. As the temperature is increased$?

A. The number of free electrons increases
B. The number of free electrons increases but the number of holes decreases
C. The number of free electrons and holes increase by the same amount
D. The number of free electrons and holes increase but not by the same amount
Answer» D. The number of free electrons and holes increase but not by the same amount
Discussion
22.

The sensitivity of human eyes is maximum at$?

A. White portion of spectrum
B. Green portion of spectrum
C. Red portion of spectrum
D. Violet portion of spectrum
Answer» C. Red portion of spectrum
Discussion
23.

Forbidden energy gap in germanium at 0 K is about$?

A. 10 eV
B. 5 eV
C. 2 eV
D. 0.78 eV
Answer» E.
Discussion
24.

Permalloy is$?

A. A variety of stainless steel
B. A polymer
C. A conon-ferrous alloy used in aircraft industry
D. A nickel an iron alloy having high permeability
Answer» E.
Discussion
25.

A thermistor is a?

A. Thermocouple
B. Thermometer
C. Miniature resistance
D. Heat sensitive explosive
Answer» D. Heat sensitive explosive
Discussion
26.

An intrinsic silicon sample has 1 million free electrons at room temperature. As the temperature is increased?

A. The number of free electrons increases
B. The number of free electrons increases but the number of holes decreases
C. The number of free electrons and holes increase by the same amount
D. The number of free electrons and holes increase but not by the same amount
Answer» D. The number of free electrons and holes increase but not by the same amount
Discussion
27.

Assertion (A): In p-n-p transistor collector current is termed negative.Reason (R): In p-n-p transistor holes are majority carriers.?

A. Both A and R are true and R is correct explanation of A
B. Both A and R are true but R is not a correct explanation of A
C. A is true but R is false
D. A is false but R is true
Answer» C. A is true but R is false
Discussion
28.

Forbidden energy gap in germanium at 0 K is about?

A. 10 eV
B. 5 eV
C. 2 eV
D. 0.78 eV
Answer» E.
Discussion
29.

The sensitivity of human eyes is maximum at?

A. White portion of spectrum
B. Green portion of spectrum
C. Red portion of spectrum
D. Violet portion of spectrum
Answer» C. Red portion of spectrum
Discussion
30.

Permalloy is?

A. A variety of stainless steel
B. A polymer
C. A conon-ferrous alloy used in aircraft industry
D. A nickel an iron alloy having high permeability
Answer» E.
Discussion