ELEVATE SKILLS!
Enquiry Form RSSB RPSC University of Rajasthan RTU Kota Careers@SA
ELEVATE SKILLS!

CS Free MCQ Bank

Access a comprehensive computer science MCQ bank for free, featuring hundreds of questions with detailed solutions. Strengthen concepts, practice effectively, and prepare confidently for exams, quizzes, and competitive tests.

Which of the following binary numbers represents an invalid BCD code?

  1. 0101

  2. 1001

  3. 0111

  4. 1011

[ Option D ]

BCD (Binary-Coded Decimal) represents decimal digits 0 to 9 using 4-bit binary codes.

Decimal BCD Code
0 0000
1 0001
2 0010
3 0011
4 0100
5 0101
6 0110
7 0111
8 1000
9 1001

🔶 BCD valid range: 0000 to 1001

🔶 1011 = 11 (which is not a valid decimal digit in BCD)

Which of the following is not a weighted code?

  1. Gray

  2. 8421

  3. Excess-3

  4. BCD

[ Option A ]

Which of the following is equivalent to decimal 255 in hexadecimal?

  1. EE

  2. FF

  3. F0

  4. FE

[ Option B ]

How many bits are needed to represent decimal number 999 in BCD?

  1. 8

  2. 12

  3. 16

  4. 32

[ Option B ]

Which of the following is a valid BCD representation of the decimal number 79?

  1. 100 1111

  2. 1111 0000

  3. 1000 1001

  4. 0111 1001

[ Option D ]

What is the 2’s complement of the binary number 01010101?

  1. 10101011

  2. 10101010

  3. 10101001

  4. 10101100

[ Option A ]

Thank You for Reading!

Thank you so much for taking the time to read my Computer Science MCQs section carefully. Your support and interest mean a lot, and I truly appreciate you being part of this journey. Stay connected for more insights and updates! If you'd like to explore more tutorials and insights, check out my YouTube channel.

Don’t forget to subscribe and stay connected for future updates.