# 9th Class Computer: chapter 5 Number system Short Questions Answer

## 9th Class Computer: chapter 5 Number system Short Questions Answer

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1. How is data represented in computer?

Computer work in binary system. This system consist of two digits 0 and 1 is called bits. Bit stand for binary digits. It is smallest unit of data that can be represented in computer. A collection of 8 bits is called byte. One byte can represent 256 different characters.
2. What is data?

A collection of raw facts and figures is called data. The word raw means that the facts has not been processed to get their exact meanings. It may consist of numbers, characters and symbols etc.
3. What is information?

The processed data is called information. It is more meaning full then data. Information may consist of number, characters, symbols, picture or sound etc.
4. Differentiate between data and information?

Data is set of raw facts and information is the processed form of data. Data is used as input in the computer and information is the output of computer.
5. What is men by number system?

A set of values used to represent different quantities is known as number system. The total number of digits used in a number system is called its base or radix.
6. What do you mean by the base or radix of a number system?

The number of digits used in any use in any number system define its base or radix. For example, base of decimal system is 10 because it use digits o to 9. Similarly, the base of binary system is 2 because it uses digit 0 and 1.
7. Write the useful property of octal system?

The useful property of octal system is is that it can be converted directly into binary form by representing each individual digit by its 3-bit binary equivalent.
8. Differentiate between binary and hexadecimal number system?

The decimal system is consist of ten system whereas binary system is base on two systems. Also, decimal has ten digits 0 to 9, whereas binary has two digits 0 and 1.
9. What is decimal number system?

The decimal number system consist of ten digits from 0 to 9. The base of decimal number system is 10. It is most widely user number.
10. What is binary number system?

Binary number system consist of two number that is 0 and 1. Its base is 2. Each digit or bit in binary number system is 0 or 1. The weight of each position in binary is a power of 2.
11. Why dose digital computer use binary representation?

The electric circuits used in digital computers has two states ON or OFF. The reason to use binary representation in computer is that the electrics component of two state are easier to construct and more reliable and cheaper. The computing operation is simple and fast with two state device.
12. What is meant by octal number system?

Octal number system consist of eight digits from 0 to 7. The base of octal number is 8. Each digital position in this system is represent by the power 8. Every digits in this system is less than 8.
13. How can we convert actual number into binary system?

We can convert octal number in to binary by converting each digits of octal number to its binary equivalent. There is 3 to 1 relation ship between octal and binary. Each octal digits can be represented by three binary digits.
14. What is mean by hexadecimal number system?

The hexadecimal system consist of 16 digits from 0 to 9 and A to F. The alphabet A to F is used to represent decimal number from 10 to 15. The base of this decimal system is 16.
15. How can we covert hexadecimal number to binary?

We can covert hexadecimal number to binary by converting the each digits of hexadecimal number to its binary equivalent. There is a 4 to 1 relationship between hexadecimal and binary. Each hexadecimal digits can be represented by four binary digits.
16. Differentiate between 1's complement and 2's complement?

1’s complement of binary number is determined directly by replacing all 1s by 0s and 0s by 1s. On the other hand, 2’s complement of binary number is determined by first taking 1’s complement and then adding 1 in the result.
17. How 1's complement of binary number is determined?

1’s complement of binary number is determined by replacing all 1s by 0s and 0s with 1s.
18. How 2's complement of binary number is determined?

2’s complement of binary number is determined by first taking 1’s complement and then adding 1 in the result.
19. Find 1's complement of 10111001.

The 1’s complement of 10111001 is 01000110.
20. What is computer code?

The language of electronic computer is binary. All numeric ans non numeric data must be converted into binary language so the computer can understand it. The representation of all numerical and non numerical data is binary digits is known as computer code.
21. What is meant by BCD code?

BCD stand for Binary Coded decimal. It used to represent decimal digits in binary. It is a four bit code. It means that each decimal digits is represented by 4 binary digits. It was used in early computers.
22. What do you know about ASCII code?

ASCII stands for American Slandered Code for Information Interchange. It was published by ANSI. It is the most widely used coding scheme for PC. A 7-bit code represent 128 characters. An 8-bit code represent 256 characters. The extended 128 unique codes represent graphic symbols.
23. What is Unicode?

Unicode is 16-bit code. It can represent 65536 characters. It has started to replace ASCII code. It can represent the character of all languages in the world.
24. What is advantage of Unicode over ASCII and EBCDIC code?

ASCII and EBCDIC is 8-bit code but Unicode is 16-bit code. It can represent 65536 characters. It means that Unicode has up to 65536 character instead of 256 characters. It has the capacity to represent of the alphabets for the major foreign languages.
25. Define LSD?

LSD stands for least significant digit. It is a digits that appear in the most left side of a number.
26. Define MSD?

MSD stands for Most significant digit. It is a digits that appear in the most right side of a number.
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