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.

When operating above its resonant frequency, a series RLC circuit has the characteristics of a:

A. series RL circuit
B. series RC circuit
C. series RLC circuit operated below its resonant frequency
D. purely resistive circuit
E. None of the above
Answer» B. series RC circuit
Discussion
2.

At cut off, the Q point is at

A. upper end of the load line
B. middle of the load line
C. lower end of the load line
D. infinity
E. None of the above
Answer» D. infinity
Discussion
3.

The south pole of a magnet is the one:

A. that would be attracted to the earths north magnetic pole
B. that has its molecules arranged in a random pattern
C. that would be attracted to the earth's south magnetic pole
D. that would be repelled by the north pole of another magnet
E. None of the above
Answer» D. that would be repelled by the north pole of another magnet
Discussion
4.

The valence electron of a copper atom experiences what kind of attraction toward the nucleus?

A. Strong
B. Neutral
C. Weak
D. Impossible to say
E. None of the above
Answer» D. Impossible to say
Discussion
5.

Suppose a step-down transformer has a turns ration of 5:1. If the secondary current is 1A rms, what is the primary-current?

A. 0.3 A
B. 0.2 A
C. 0.4 A
D. 0.6 A
E. None of the above
Answer» C. 0.4 A
Discussion
6.

The peak value of a sine waveform is:

A. the amplitude at 70.7% of the maximum value
B. the amplitude at 90% of the maximum value
C. the amplitude at 1.41 times the maximum value
D. the maximum positive or negative value
E. None of the above
Answer» E. None of the above
Discussion
7.

If N1/N2 = 2, and the primary voltage is 120 V, what is the secondary voltage?

A. 0 V
B. 36 V
C. 40 V
D. 60 V
E. None of the above
Answer» E. None of the above
Discussion
8.

A device that converts light energy to electrical energy is called a:

A. thermocouple
B. solar cell
C. photodiode
D. photo transistor
E. None of the above
Answer» C. photodiode
Discussion
9.

How much current flows through a 60-W light bulb that is operating at 120 V?

A. 0.5A
B. 180 A
C. 2 A
D. 7200 A
E. None of the above
Answer» B. 180 A
Discussion
10.

The basic unit of measurement for resistance is the:

A. volt
B. ampere
C. ohm
D. watt
E. None of the above
Answer» D. watt
Discussion
11.

What is the phase shift between total current and voltage, if 100 ohm resistor connected in parallel with an inductor that has a reactance of 200W?

A. 0 degree
B. 26.6 degree
C. 90 degree
D. 180 degree
E. None of the above
Answer» C. 90 degree
Discussion
12.

Suppose a voltage source has an ideal voltage of 15V and a source resistance of 0.2W. For what values of load resistance will the voltage source appear stiff?

A. 20 Ohm
B. 30 Ohm
C. 10 Ohm
D. 100 Ohm
E. None of the above
Answer» B. 30 Ohm
Discussion
13.

A real voltage source has

A. Zero internal resistance
B. Infinite internal resistance
C. A small internal resistance
D. A large internal resistance
E. None of the above
Answer» D. A large internal resistance
Discussion
14.

The voltage across a 1N4001 is 0.93V when the current is 1A. What is the power dissipation of the diode for these values?

A. 0.93 W
B. 0.93 V
C. 1 A
D. 9.3 W
E. None of the above
Answer» B. 0.93 V
Discussion
15.

A loadstone is:

A. a natural magnet
B. a temporary magnet
C. an artificial magnet
D. a paramagnetic alloy
E. None of the above
Answer» B. a temporary magnet
Discussion
16.

Which one of the following phrases most accurately describes a purely capacitive circuit?

A. Resistances provide the only opposition to current flow
B. Capacitive reactance provides the only opposition to current flow
C. The ac voltage leads the current by 90 degree
D. Combinations of resistance and capacitive reactance provide any opposition to current flow
E. None of the above
Answer» C. The ac voltage leads the current by 90 degree
Discussion
17.

The saturation point is approximately the same as

A. cutoff point
B. lower end of the load line
C. upper end of the load line
D. infinity
E. None of the above
Answer» D. infinity
Discussion
18.

Which one of the following statements is true for the currents in a series RC circuit?

A. The current always has the same amplitude and phase for every part of the circuit
B. The total current is equal to the sum of the currents for the resistance and capacitance
C. The total current is greater than the sum of the currents for the resistance and capacitance
D. The total current is less than the sum of the currents for the resistance and capacitance
E. None of the above
Answer» B. The total current is equal to the sum of the currents for the resistance and capacitance
Discussion
19.

A transistor has how many doped regions?

A. 1
B. 2
C. 3
D. 4
E. None of the above
Answer» D. 4
Discussion
20.

A circuit has two different voltage sources that are connected in a series-opposing form. If the sources are rated at 6 V and 9 V, what is the total source voltage?

A. 3 V
B. 16 V
C. 7.5 V
D. 8 V
E. None of the above
Answer» B. 16 V
Discussion
21.

The emitter diode is usually

A. Forward-biased
B. Reverse-biased
C. Nonconducting
D. Operating in the breakdwon region
E. None of the above
Answer» B. Reverse-biased
Discussion
22.

An intrinsic semiconductor has some holes in it at room temperature. What causes these holes?

A. Doping
B. Valence electrons
C. Free electrons
D. Thermal energy
E. None of the above
Answer» E. None of the above
Discussion
23.

Which one of the following statements is true?

A. inductive reactance decreases with operating frequency
B. inductive reactance is at a maximum for dc source voltages
C. inductive reactance increases with operating frequency
D. There is no meaningful relationship between inductive reactance and operating frequency
E. None of the above
Answer» D. There is no meaningful relationship between inductive reactance and operating frequency
Discussion
24.

A device that converts chemical energy to electrical energy is called a:

A. solar cell
B. thermocouple
C. chemical cell
D. electric device
E. None of the above
Answer» D. electric device
Discussion
25.

The total capacitance of a series capacitor circuit is:

A. equal to the sun of the individual capacitive-reactance values
B. equal to the sum of the individual capacitance values
C. equal to the source voltage divided by total current
D. less than the value of the smallest capacitor
E. None of the above
Answer» E. None of the above
Discussion
26.

A zener diode has a voltage of 10 V and a current of 20 mA. What is the power dissipation?

A. 200 mW
B. 300 mW
C. 20 mW
D. 10 mW
E. None of the above
Answer» B. 300 mW
Discussion
27.

Which one of the following phrasers best describes flux density?

A. The concentration of lines of magnetic force
B. The rate of change of the number of lines of magnetic force
C. The opposition to a build-up of magnetic fields
D. The force that maintains lines of force
E. None of the above
Answer» B. The rate of change of the number of lines of magnetic force
Discussion
28.

Which is the most widely used semiconductor?

A. Copper
B. Silicon
C. Germanium
D. All of the above
E. None of the above
Answer» C. Germanium
Discussion
29.

An audio transformer has a turn ratio of 9, What is its impedance ratio?

A. 81
B. 85
C. 6
D. 9
E. None of the above
Answer» B. 85
Discussion
30.

The transistor has a current gain of 175. If the base current is 0.1 mA, what is the collector current?

A. 1750 mA
B. 17.5 mA
C. 175 mA
D. 1.75 mA
E. None of the above
Answer» C. 175 mA
Discussion
31.

If the base supply voltage increases, the Q point moves

A. down
B. up
C. nowhere
D. off the load line
E. None of the above
Answer» B. up
Discussion
32.

Positive ions are atoms that have

A. Gained a proton
B. Lost a proton
C. Gained an electron
D. Lost an electron
E. None of the above
Answer» E. None of the above
Discussion
33.

Which one of the following is a statement of Kirchhoffs current law?

A. The current through a resistance is proportional to the value of resistance and the IR drop across it
B. The total current in a parallel circuit is less than the value of the smallest current
C. The algebraic sum of currents in a loop is equal to zero
D. The algebraic sum of currents entering and leaving a point is equal to zero
E. None of the above
Answer» D. The algebraic sum of currents entering and leaving a point is equal to zero
Discussion
34.

Voltage is

A. The flow of charged particles through a material
B. The smallest electrically charged particle
C. Trie force that causes electrons to flow
D. The number of free electrons in an atom
E. None of the above
Answer» D. The number of free electrons in an atom
Discussion
35.

What is the turns ratio for the transformer specified in the above question?

A. 10.738
B. 0.707
C. 1.5
D. 0.575
E. None of the above
Answer» C. 1.5
Discussion
36.

The total impedance of a series RLC circuit:

A. is minimum at the resonant frequency
B. always increases as the applied frequency increases
C. always decreases as the applied frequency increases
D. is maximum at the resonant frequency
E. None of the above
Answer» B. always increases as the applied frequency increases
Discussion
37.

Which one of the following statements is true for the voltages in a series RL circuit?

A. The total voltages is equal to the sum of the voltages across the resistance and inductance
B. The voltage always has the same amplitude and phase for every part of the circuit
C. The total voltage is less than the sum of the voltages across the resistance and inductance
D. The total voltage lags the total current by less than 90
E. None of the above
Answer» D. The total voltage lags the total current by less than 90
Discussion
38.

The core of an electromagnet is said to be in saturation when:

A. the core is permitted to move freely within the coil
B. an increase in current through the coil causes no further increase in the mmf
C. frequent changes in the direction of current through the coil causes heating effects in the core material
D. changing the polarity of the current in the coil changes the polarity of the magnetic field around the core
E. None of the above
Answer» C. frequent changes in the direction of current through the coil causes heating effects in the core material
Discussion
39.

As the temperature increases, the current gain

A. increases
B. decreases
C. contant
D. can be any of the above
E. None of the above
Answer» B. decreases
Discussion
40.

What is a negative ion?

A. An atom that contains more electrons than neutrons
B. An atom that contains more protons than neutrons
C. An atom that contains more electrons than protons
D. An atom that contains more protons than electrons
E. None of the above
Answer» D. An atom that contains more protons than electrons
Discussion
41.

In a transistor operates at the middle of the load line, an increase in the base resistance will move the Q point

A. down
B. up
C. nowhere
D. off the load line
E. None of the above
Answer» B. up
Discussion
42.

Doubling the diameter of the coil in an inductor:

A. multiplies the value of inductance by two
B. reduces the value of inductance by one-half
C. reduces the value of inductance by one-fourth
D. multiplies the value of inductance by four
E. None of the above
Answer» B. reduces the value of inductance by one-half
Discussion
43.

Assuming 100% efficiency, what is the power being consumed at the secondary winding of the transformer described in question 91?

A. 200 W
B. 1000 W
C. 20 W
D. 100 W
E. None of the above
Answer» B. 1000 W
Discussion
44.

Terminal Table

A. a permanent table which lists all key words and special symbols of the language in symbolic form
B. a permanent table of decision rules in the form of patterns for matching with the uniform symbol table to discover syntactic structure
C. consists of a full or partial list of the tokens as they appear in the program. Created by Lexical analysis and used for syntax analysis and interpretation
D. contains all constants in the program
Answer» B. a permanent table of decision rules in the form of patterns for matching with the uniform symbol table to discover syntactic structure
Discussion
45.

A compiler for a high-level language that runs on one machine and produces code for a different machine is called

A. optimizing compiler
B. one pass compiler
C. cross compiler
D. multipass compiler
Answer» D. multipass compiler
Discussion
46.

Assembly code data base is associated with

A. a permanent table which lists all key words and special symbols of the language in symbolic form
B. a permanent table of decision rules in the form of patterns for matching with the uniform symbol table to discover syntactic structure
C. consists of a full or partial list or the tokens as they appear in the program. Created by Lexical analysis and used for syntax analysis and interpretation
D. assembly language version of the program which is created by the code generation phase and is input to the assembly phase
Answer» E.
Discussion
47.

Indicate which of the following is not true about 4GL?

A. 4GL does not support a high-level of screen interaction
B. Many database management system packages support 4GLs
C. A 4GL is a software tool which is written, possibly, in some third generation language
D. All of the above
Answer» B. Many database management system packages support 4GLs
Discussion
48.

Convert the BRNE h#01E6, i assembly language instructions into hexadecimal machine language:

A. 0111EF
B. 9001E6
C. DA000F
D. 40
Answer» C. DA000F
Discussion
49.

If special forms are needed for printing the output, the programmer specifies these forms through

A. JCL
B. IPL
C. Utility programs
D. Load modules
Answer» B. IPL
Discussion
50.

Which of the following systems software does the job of merging the records from two flies into one?

A. Documentation system
B. Utility program
C. Networking software
D. Security software
Answer» C. Networking software
Discussion