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Digital Computer Electronics — Part 2 MCQs with Explanations

Practice high-yield Computer Science & IT MCQs on Digital Computer Electronics — Part 2 with worked academic solutions for PPSC, FPSC, CSS, PMS, NTS.

Questions
40
Difficulty Level
Exam-Level
Target Exams
PPSC, FPSC, CSS...
Estimated Time
48 mins
Exam-Level PPSC FPSC CSS PMS NTS
Verified for Commission Syllabus • Oct 14, 2026
40

Verified Practice Questions

Interactive test mode with detailed academic worked solutions

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Question 1 of 40
★ PPSC ★ FPSC

An inverter is also called a _____ gate.

Question 2 of 40
★ PPSC ★ FPSC

Conversion of decimal number 13 10 to it's octal number equivalent is

Question 3 of 40
★ PPSC ★ FPSC

The binary number 1100 0101 has _____ bytes

Question 4 of 40
★ PPSC ★ FPSC

With a NAND latch a low R and a low S produce a _____ condition.

Question 5 of 40
★ PPSC ★ FPSC

Which of the following logic families has the highest noise immunity?

Question 6 of 40
★ PPSC ★ FPSC

The ALU carries out arithmetic and logic operations. It processes _____ numbers rather than decimal numbers.

Question 7 of 40
★ PPSC ★ FPSC

Conversion of decimal number 71 10 to it's binary number equivalent is

Question 8 of 40
★ PPSC ★ FPSC

Which of the following flip-flops is free from race around problem?

Question 9 of 40
★ PPSC ★ FPSC

Conversion of decimal number 67 10 to it's octal number equivalent is

Question 10 of 40
★ PPSC ★ FPSC

A NOR gate has two or more input signals. All input must be _____ to get a high output

Question 11 of 40
★ PPSC ★ FPSC

If a microcomputer has a 64K memory, what are the hexadecimal notations for the first and last memory location?

Question 12 of 40
★ PPSC ★ FPSC

A microprocessor has memory locations from 0000 to 3FFF. Each memory location stores 1 byte. How bytes can the memory store? Express this in kilobytes?

Question 13 of 40
★ PPSC ★ FPSC

The m-bit parallel adder consists of:

Question 14 of 40
★ PPSC ★ FPSC

An OR gate has 6 inputs. How many input words are in its truth table?

Question 15 of 40
★ PPSC ★ FPSC

Which TTL sub-family has maximum speed?

Question 16 of 40
★ PPSC ★ FPSC

Conversion of binary number 110001 2 to its decimal number is

Question 17 of 40
★ PPSC ★ FPSC

The OR gate has two or more input signals. If any input is _____ the output is high.

Question 18 of 40
★ PPSC ★ FPSC

How many memory locations can 14 address bits access?

Question 19 of 40
★ PPSC ★ FPSC

The ASCII code is a 7-bit code for

Question 20 of 40
★ PPSC ★ FPSC

The EXCLUSIVE - NOR gate is equivalent to an _____ gate followed by an invertor.

Question 21 of 40
★ PPSC ★ FPSC

The 2's compliment of binary number 010111.1100 is

Question 22 of 40
★ PPSC ★ FPSC

In boolean algebra, the times sign stands for the _____ operation

Question 23 of 40
★ PPSC ★ FPSC

What logic function is obtained by adding an inverter to the output of an AND gate?

Question 24 of 40
★ PPSC ★ FPSC

Conversion of an octal number 7432 8 to a binary number is

Question 25 of 40
★ PPSC ★ FPSC

Conversion of an octal number 143 8 to hexadecimal number is

Question 26 of 40
★ PPSC ★ FPSC

The memory cell of a dynamic RAM is simpler and smaller than the memory cell of a _____ RAM.

Question 27 of 40
★ PPSC ★ FPSC

A byte is consist of _____ bits

Question 28 of 40
★ PPSC ★ FPSC

What is the 1's complement of 0000 1111 0010 1101 number?

Question 29 of 40
★ PPSC ★ FPSC

Addition of 1101 2 and 1010 2 is

Question 30 of 40
★ PPSC ★ FPSC

A NAND gate is equivalent to an AND gate followed by an inverter. All inputs must be _____ to get a low output

Question 31 of 40
★ PPSC ★ FPSC

What logic function is produced by adding an inverter to the output of an AND gate?

Question 32 of 40
★ PPSC ★ FPSC

Conversion of decimal number 28 10 to it's octal number equivalent is

Question 33 of 40
★ PPSC ★ FPSC

Division of 100011 2 by 101 2 is

Question 34 of 40
★ PPSC ★ FPSC

The NOR gate is logically equivalent to an OR gate followed by an _____

Question 35 of 40
★ PPSC ★ FPSC

The dynamic race hazard problem occurs in

Question 36 of 40
★ PPSC ★ FPSC

Resistor Ratio design is used in linear ICs because

Question 37 of 40
★ PPSC ★ FPSC

What advantages do ICs have over discrete-device circuits due to their greater complexity (i.e. more circuitary in less area)

Question 38 of 40
★ PPSC ★ FPSC

Conversion of an octal number 136 8 to hexadecimal number is

Question 39 of 40
★ PPSC ★ FPSC

The control and arithmetic-logic sections are called the _____

Question 40 of 40
★ PPSC ★ FPSC

How many full adders are required to construct an m- bit parallel adder?

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In competitive commission exams (FPSC, PPSC, KPPSC, SPSC, CSS, PMS), questions are frequently phrased with distractor options designed to catch rote learners. Whenever you answer an MCQ, read the Detailed Academic Explanation and Conceptual Anchor to understand why the remaining options are incorrect.

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