Computer Science
Class-8
Chapter-2 Number System
A. Answer the following questions:
1. What is a binary data?
Answer: The digital computer accept all the data in the form of binary numbers of using 1 and 0 which represent On and Off respectively. Modern computers work with the collection of 1 and 0 number. A single pair of 1 and 0 is called bit.
2. What is the difference between analog and digital computers?
Answer: Analog computers works on analog signals and Digital computers works on digital signals.
3. Define octal number system.
Answer: Octal number system is a number system that include 0 to 7 numbers. Its base is 8. Examples: 15624, 635247,02553 etc.
4. Write a short note on string.
Answer: Group of letters is called a string. A string is a group of characters, written one after another. Examples: AC75, 85647, BD56 etc.
5. Explain number system and its commonly used types.
Answer: Number system is a system of representing numbers. As we know that number is a numerical value, it helps to perform mathematical calculations.
There are different types of number systems:
* Decimal number system
* Binary number system
* Octal number system
* Hexadecimal number system.
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6. What are the rules to convert a decimal number into binary number?
Answer: The rules to convert a decimal number into binary numbers:
Example: To convert 86 into binary divide 86 by 2 and write the remainder 0 or 1 at its side. Similar, divide the quotient again by 2 and write the remainder at its side and so on.
Start picking the remainder from the last, that is 1, then second last remainder 0 and then 1,0,1,1,0. Join them together as 0101110 which is the binary number.
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