Introduction to Number System Class 7 MCQs
Introduction to Number System – Class 7 MCQs with Answers & Explanations
Class: CBSE Class 7
Subject: Computer Science
Section: Number System
Topic: Introduction to Number System
Subject: Computer Science
Section: Number System
Topic: Introduction to Number System
Strictly Based on NCERT Syllabus | Useful for CBSE Unit Test • Half-Yearly • Annual Examination
1. What is a Number System?
Answer: a)
A number system is a method used to represent numbers using digits or symbols.
A number system is a method used to represent numbers using digits or symbols.
2. The number system we use in daily life is:
Answer: b)
The decimal system uses digits 0–9 and has base 10.
The decimal system uses digits 0–9 and has base 10.
3. Binary number system uses how many digits?
Answer: a)
Binary system uses only two digits: 0 and 1.
Binary system uses only two digits: 0 and 1.
4. Base of decimal system is:
Answer: c)
Decimal system contains 10 digits (0–9), so its base is 10.
Decimal system contains 10 digits (0–9), so its base is 10.
5. Base of binary system is:
Answer: a)
Binary system has only two digits, so its base is 2.
Binary system has only two digits, so its base is 2.
6. Which number is a binary number?
Answer: a)
Binary numbers contain only 0 and 1.
Binary numbers contain only 0 and 1.
7. Computers understand:
Answer: b)
Computers work internally using binary language (0 and 1).
Computers work internally using binary language (0 and 1).
8. Octal system has base:
Answer: b)
Octal system uses digits 0–7 and has base 8.
Octal system uses digits 0–7 and has base 8.
9. Hexadecimal system has base:
Answer: d)
Hexadecimal uses digits 0–9 and A–F, making base 16.
Hexadecimal uses digits 0–9 and A–F, making base 16.
10. The smallest binary digit is:
Answer: a)
Binary digits are 0 and 1; 0 is the smallest.
Binary digits are 0 and 1; 0 is the smallest.
11. Decimal digits range from:
Answer: c)
Decimal number system uses digits from 0 to 9.
Decimal number system uses digits from 0 to 9.
12. Which is not a binary digit?
Answer: c)
Binary system only allows digits 0 and 1.
Binary system only allows digits 0 and 1.
13. Binary is also called:
Answer: a)
Binary number system has base 2.
Binary number system has base 2.
14. Which system uses digits 0–7?
Answer: b)
Octal number system contains eight digits from 0 to 7.
Octal number system contains eight digits from 0 to 7.
15. Which letter is used in hexadecimal?
Answer: a)
Hexadecimal includes A to F to represent values 10–15.
Hexadecimal includes A to F to represent values 10–15.
16. 1011 in binary contains how many digits?
Answer: c)
It contains four digits (1,0,1,1).
It contains four digits (1,0,1,1).
17. Decimal system is also called:
Answer: c)
It is called base 10 system.
It is called base 10 system.
18. Which system is mainly used by computers?
Answer: b)
Computers operate using binary digits internally.
Computers operate using binary digits internally.
19. 7 belongs to which number system?
Answer: b)
Digit 7 exists in decimal (0–9) and octal (0–7).
Digit 7 exists in decimal (0–9) and octal (0–7).
20. Number system helps computers to:
Answer: a)
Number systems allow computers to represent and process data.
Number systems allow computers to represent and process data.