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
   

Answer: D

 

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

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

Answer: C

 

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

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

Answer: A

 

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

1. 01001001
   
2. 01001010
   
3. 10010001
   
4. 10010010
   

Answer: A

Question 5. What is the octal value of the binary number 1111100?

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

Answer: C

 

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

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

Answer: D

 

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

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

Answer: B

 

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

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

Answer: B

 

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

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

Answer: C

 

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
   

Answer: C




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

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

Answer: A

 

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

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

Answer: A

 

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

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

Answer: B

 

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

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

Answer: C

 

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

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

Answer: D

 

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

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

Answer: A

 

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

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

Answer: D

 

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

1. 11021
   
2. 10101
   
3. 12345
   
4. 11111
   

Answer: B

Question 19. What is the binary value of the octal number 777?

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

Answer: A




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
   

Answer: A

 

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

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

Answer: B

 

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

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

Answer: D

 

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

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

Answer: B

 

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

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

Answer: B




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

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

Answer: A

 

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

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

Answer: A

 

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

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

Answer: A

 

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

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

Answer: B

 

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

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

Answer: B

 

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
   

Answer: B

In conclusion, these 30 multiple choice questions cover various topics related to number systems in computer science. It is important to have a good understanding of these concepts as they are fundamental to computing. By practicing these questions, you can test your knowledge and identify areas where you need more study. I hope you learned these questions and answers well. But if you have any doubt then you can ask in comment section,

Learn More;

• Learn HR Interview Questions with Answers.
  
• Learn Interview questions that asked in Google.
  
• Learn most important Interview questions of C++.
  
• Top 20 Data Structure and Algorithm Interview Questions.