Class 8 Chapter 15 Computer Number System

 Class 8 Chapter 15 Computer Number System

Write very Short answer to the following questions.

a. Which number system has the base value 8? Ans. The number system with the base value 8 is the octal number system. b.What are the four types of the number system? Ans. The four types of number systems are decimal, binary, octal and hexadecimal. c. What is the base of the hexadecimal number? Ans. The base of the hexadecimal number system is 16. d. What is the base of the octal number system?

Ans. The base of the octal number system is 8. e. What is the sum of the 0 + 1 in binary addition?

Ans. The sum of 0 + 1 in binary addition is 1.  f. What is the difference of 1-1 in binary subtraction?

Ans. The difference of 1 - 1 in binary subtraction is 0

Write short answer to the following questions

1. What is computer number system? Write down the types of computer number systems.

Ans: A. Computer number system refers to the way in which computers represent and manipulate numerical values. The types of computer number systems are binary, octal, decimal, and hexadecimal.

1. Define binary number and decimal number with examples.

Ans:  A binary number is a number represented using only two digits, 0 and 1. It is the foundation of all modern computer systems. For example, the binary number 1001 represents the decimal value 9.

A decimal number is a number represented using the base 10 number system, with digits 0-9. For example, the decimal number 42 represents the value 42.

1. What is octal and hexadecimal number system?

Ans: Octal number system is a base 8 number system, it uses 8 digits 0-7. In this system, each digit represents a power of 8.

Hexadecimal number system is a base 16 number system, it uses 16 digits(0-9, A-F) to represent a value. Each digit represents a power of 16.

1. Draw a truth table for binary addition.

Ans: Truth table for binary addition:

A B Carry Sum 0 0 0 0 0 1 0 1 1 0 0 1 1 1 1 0

1. Prepare a truth table for binary subtraction.

Ans: Truth table for binary subtraction:

A B Borrow Difference 0 0 0 0 0 1 1 1 1 0 0 1 1 1 0 0

Please note that the above truth tables are for one-bit binary subtraction and addition. If you need truth tables for multiple bit binary operations, it would be more complex.