We have compiled very important and most repeated questions for Electronics Online MCQs which are asked in academic as well as in different exams. Most importantly our Online MCQs will help you to evaluate and check your knowledge of computer and IT basics. These Computer Knowledge MCQs will help you to crack any competitive or academic exams.
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Electronics Online MCQs with Answers
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1. Which table shows the logical state of a digital circuit output for every possible combination of logical states in the inputs?
Function tablesrc=
Routing tablesrc=
ASCII table
None of thesesrc=
Correct Ans: Truth table
2. Which of the following gates is known as coincidence detector?
AND gate
OR gate
NOT gate
NAND gate
None of these
Correct Ans: AND gate
3. The EXCLUSIVE NOR gate is equivalent to which gate followed by an inverter?
OR
AND
NAND
XOR
None of these
Correct Ans: XOR
4. Which of the following gates are added to the inputs of the OR gate to convert it to the NAND gate?
NOT
AND
OR
XOR
None of these
Correct Ans: NOT
5. Which of the following statements is wrong?
Propagation delay is the time required for a gate to change its state
Noise immunity is the amount of noise which can be applied to the input of a gate without causing the gate to change state
Fan-in of a gate is always equal to fan-out of the same gate
Operating speed is the maximum frequency at which digital data can be applied to a gate
None of these
Correct Ans: Fan-in of a gate is always equal to fan-out of the same gate
6. The time required for a pulse to decrease from 90 to 10 per cent of its maximum value is called
Rise time
Decay time
Binary level transition period
Propagation delay
None of these
Correct Ans: Decay time
7. Odd parity of word can be conveniently tested by
OR gate
AND gate
NOR gate
XOR gate
None of these
Correct Ans: XOR gate
8. What is the minimum number of two-input NAND gates used to perform the function of two input OR gate?
one
two
three
four
None of these
Correct Ans: three
9. The maximum frequency at which digital data can be applied to gate is called
Operating speed
Propagation speed
Binary level transaction period
Charging time
None of these
Correct Ans: Operating speed
10. The time required for a gate or inverter to change its state is called
Rise time
Decay time
Propagation time
Charging time
None of these
Correct Ans: Propagation time
11. The logic 0 level of a CMOS logic device is approximately
1.2 volts
0.4 volts
5 volts
0 volts
None of these
Correct Ans: 0 volts
12. Karnaugh map is used for the purpose of
Reducing the electronic circuits used
To map the given Boolean logic function
To minimize the terms in a Boolean expression
To maximize the terms of a given Boolean expression
None of these
Correct Ans: To minimize the terms in a Boolean expression
13. When an input signal A=11001 is applied to a NOT gate serially, its output signal is
111
110
10101
11001
None of these
Correct Ans: 110
14. A bulb in a staircases has two switches, one switch being at the ground floor and the other one at the first floor. The bulb can be turned ON and also can be turned OFF by and one of the switches irrespective of the state of the other switch. The logic of switching of the bulb resembles.
an AND gate
an XOR gate
an OR gate
a NAND gate
None of these
Correct Ans: an XOR gate
15. The output of a logic gate is "1" when all its input are at logic "0".The gate is either
NAND or an EX OR gate
an OR or an EX NOR gate
NOR or an EX-NOR gate
an AND or an EX-OR gate
None of these
Correct Ans: NOR or an EX-NOR gate
16. Which gate must be interposed between the cascaded stages of a parallel binary adder comprising full adders for transmission purpose of carry C11 or C22 to the next stage?
OR gate
AND gate
EX-OR gate
NAND gate
None of these
Correct Ans: OR gate
17. Being a universal gate, it is possible for NOR gate to get converted into AND gate by inverting the inputs ______.
before getting applied to NOR gate
after getting applied to NOR gate
before getting applied to AND gate
after getting applied to AND gate
None of these
Correct Ans: before getting applied to NOR gate
18. Which gates are sequentially cascaded or involved in an entire logic-array of AND-OR-INVERT (AOI) configuration?
AND-OR-AND
AND-OR-NOT
AND-OR-NOR
AND-OR-EX-OR
None of these
Correct Ans: AND-OR-NOT
19. Which of the below stated application/s employ Ex-OR gate from the arithmetic functioning point of view?
Matching Circuit
Equality Detector
Inequality Comparator
All of the above
None of these
Correct Ans: All of the above
20. Exclusive-OR (XOR) logic gates can be constructed from what other logic gates?
OR gates only
AND gates and NOT gates
AND gates, OR gates, and NOT gates
OR gates and NOT gates
None of these
Correct Ans: AND gates, OR gates, and NOT gates
21. If the output of a three-input AND gate must be a logic LOW, what must the condition of the inputs be?
All inputs must be LOW.
All inputs must be HIGH.
At least one input must be LOW.
At least one input must be HIGH.
None of these
Correct Ans: At least one input must be LOW.
22. If a signal passing through a gate is inhibited by sending a LOW into one of the inputs, and the output is HIGH, the gate is a(n):
AND
NAND
NOR
OR
None of these
Correct Ans: NAND
23. A single transistor can be used to build which of the following digital logic gates?
AND gates
OR gates
NAND gates
NOT gates
None of the above
Correct Ans: NOT gates
24. The output will be a low for any case when one or more inputs are zero in a(n)
OR gate
NOT gate
AND gate
NAND gate
None of the above
Correct Ans: AND gate
25. Which of the following connects the computer to a telephone line?
Processor
Modem
USB Drive
Multiplexer
None of the above
Correct Ans: Modem
26. A capacitor stores electrical energy as ____________
Current
Voltage
A magnetic field
An electric field
None of the above
Correct Ans: An electric field
27. The length of time between a point in one cycle and the same point in the next cycle of an AC wave is the _____________
Frequency
Magnitude
Amplitude
Period
Peak to peak value
Correct Ans: Period
28. A material that has extremely high electrical resistance is known as _____________
A semiconductor
A paraconductor
A resistor
An insulator
A diamagnetic substance
Correct Ans: An insulator
29. Suppose you double the voltage in a simple DC circuit, and cut the resistance in half. The current will become ___________
Half as great
Twice as great
The same as it was before
Eight times as great
Four times as great
Correct Ans: Four times as great
30. The unit of potential difference is the ___________
Farad
Watt
Siemens
Volt
None of The Above
Correct Ans: Volt
31. Charge in motion is called __________
Retentivity
Conductance
Flux
Resistance
Current
Correct Ans: Current
32. What is the direction of the current flow (electron flow) in a closed DC circuit?
From the more positive to the more negative potential
From the more negative to the more positive potential
It depends on the components in the circuit
It alternates back and forth from negative to positive
None of these
Correct Ans: From the more negative to the more positive potential
33. Is it possible that 48V phantom power can damage a balanced, dynamic Mic ____________
Yes, it damages the voice coil
Yes, it burns out the output transformer
No, it just results in a low level hum noise, as phantom power has a frequency of 60 hz
No, as the same potential is applied to both leads of the voice coil
Yes, if the mic is plugged in while the power is on
Correct Ans: No, as the same potential is applied to both leads of the voice coil
34. What is the difference between potential and voltage?
No difference
The voltage is the product of the two potentials
The voltage is the sum of two potentials
The voltage is the difference of two potentials
None of these
Correct Ans: The voltage is the difference of two potentials
35. In what type of circuit is the total resistance smaller than the smallest resistance?
Serial circuits of resistors
Parallel circuits of resistors
Parallel circuits of capacitors
Serial circuits of inductors
Parallel circuits of diodes
Correct Ans: Parallel circuits of resistors