# Number System MCQ with Answers

In computer science, number systems are fundamental to understanding how computers process information. They are used to represent data and perform arithmetic operations (Number System MCQ with Answers). This blog post will cover 30 multiple choice questions with answers related to number systems in computer science.

Top 30 Number System MCQ with Answers

Question 1. What is the decimal value of the binary number 101011?

1. 21
2. 43
3. 53
4. 61

Question 2. Which of the following is NOT a base of a number system?

1. 2
2. 10
3. 32
4. 33

Question 3. What is the value of the hexadecimal number 3F in decimal?

1. 63
2. 65
3. 77
4. 79

Question 4. What is the binary value of the decimal number 73?

1. 01001001
2. 01001010
3. 10010001
4. 10010010 Question 5. What is the octal value of the binary number 1111100?

1. 74
2. 76
3. 77
4. 78

Question 6. What is the decimal value of the octal number 67?

1. 53
2. 55
3. 61
4. 63

Question 7. Which of the following is a valid hexadecimal digit?

1. G
2. 9
3. \$
4. %

Question 8. What is the binary value of the hexadecimal number 2B?

1. 00101011
2. 01001011
3. 10101011
4. 11001011

Question 9. What is the decimal value of the binary number 1110001?

1. 97
2. 99
3. 101
4. 103

Question 10. Which of the following is the largest binary number that can be represented with 6 bits?

1. 31
2. 62
3. 63
4. 64

Question 11. What is the binary value of the decimal number 128?

1. 10000000
2. 10000001
3. 11111111
4. None of the above

Question 12. What is the decimal value of the binary number 11111111?

1. 255
2. 256
3. 257
4. None of the above

Question 13. What is the octal value of the binary number 1101101?

1. 33
2. 53
3. 65
4. 75

Question 14. What is the binary value of the octal number 23?

1. 001011
2. 010011
3. 011011
4. 110011

Question 15. What is the hexadecimal value of the binary number 10010110?

1. 56
2. 96
3. 9A
4. B6

Question 16. Which of the following is a valid octal digit?

1. 8
2. 9
3. A
4. B

Question 17. Which of the following is the largest hexadecimal digit?

1. A
2. B
3. C
4. F

Question 18. Which of the following is a valid binary number?

1. 11021
2. 10101
3. 12345
4. 11111 Question 19. What is the binary value of the octal number 777?

1. 000111111111
2. 111111111
3. 100110011001
4. None of the above

Question 20. Which of the following is the smallest decimal number that can be represented with 6 bits?

1. -32
2. -31
3. 0
4. 1

Question 21. What is the decimal value of the octal number 777?

1. 509
2. 511
3. 513
4. 515

Question 22. What is the binary value of the decimal number -10?

1. 01010
2. 10110
3. 11010
4. 11110

Question 23. What is the octal value of the decimal number -65?

1. 101
2. 117
3. 123
4. 135

Question 24. Which of the following is a valid hexadecimal number?

1. 0x9G
2. 0x9F
3. 0xFG
4. None of the above

Question 25. What is the hexadecimal value of the binary number 111110001?

1. FC1
2. FD1
3. FE1
4. FF1

Question 26. Which of the following is the largest octal digit?

1. 7
2. 8
3. 9
4. A

Question 27. What is the decimal value of the binary number 11001101?

1. 205
2. 213
3. 221
4. 229

Question 28. What is the binary value of the octal number 44?

1. 100100
2. 101100
3. 110100
4. 111100

Question 29. What is the octal value of the binary number 100111?

1. 27
2. 47
3. 67
4. 87

Question 30. Which of the following is the smallest binary number that can be represented with 5 bits?

1. 0
2. 1
3. 10
4. 100