MCQs on Digital Electronics

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01․ Which is the example of digital device from the given option ?
Record players

The microprocessor is a multipurpose, programmable device that accepts digital data as input, processes it according to instructions stored in its memory, and provides results as output is a digital device.

02․ How the digital signals is transmitted through a single conductor ?
None of the above

In serial data transmission we send all the data in a single queue.

03․ How many input and output required for multiplexer ?
Many input and one output
One input and many output
One input and one output
None of the above

Multiplexer is a combinational circuit that selects binary information from one of many input lines and directs it to a single output line. It can send a lot of data in a single device.

04․ Why encoder is used in the digital electronics ?
To convert non coded information into coded form
To convert coded information into non coded form
It is used to separate address bus and data bus
None of the above

Encoder receives the non coded form in to coded form in the required form.

05․ How many numbers are used in the decimal number system?
1 to 10
0 to 10
0 to 9
None of the above

Decimal number system (base 2) has 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, total ten numbers.

06․ When will be the output of an AND gate is HIGH if there are three inputs, A, B, and C ?
A = 0, B = 0, C = 0
A = 1, B = 1, C = 0
A = 1, B = 0, C = 1
A = 1, B = 1, C = 1

When all the inputs are high then only AND gate output is high. As the output of AND is Y = A.B.C

07․ How many output is high of NOR GATE ?

Truth table of NOR i/p-A i/p-B o/p 0 0 1 0 1 0 1 0 0 1 1 0

08․ Which of the logical operations is represented by the + sign in Boolean algebra ?

OR gate performs addition. So it represents '+' sign.

09․ Why small bubble is given on the output of the NAND gate symbol ?
Output is inverted
Open collector output
None of the above

The bubble indicates the inversion operation because NAND gate is the inversion of AND gate. NAND = NOT + AND.

10․ What is the Boolean expression for a two-input AND gate ?
A + B
A & B
A - B

Because AND gate is the product or dot operation. Y = A.B