### BINARY NUMBER SYSTEM.

1. Answer the following questions in one or two sentences each:

(1)What is the decimal system?
Ans. The place-value system with base 10 is called the decimal system.
(2)What is the binary system?
Ans. The place-value system with base 2 is called the binary system.
(3)Write any two points of difference between the decimal and binary number system.
Ans. The base of decimal system is 10. There are 10 digits (0 to 9).The base of binary system is 2. There are 2 digits are available (0 to 1).
(4)What is the place value of each bit in the binary notation?
Ans. In the binary notation, the place-value of each successive bit to the left of the unit position indicates a multiple of successive power of 2.
(5)What is a byte?
Ans.  A group of 8 bit treated as a unit in computer hardware is called byte.
(6)What is a word to microprocessor?
Ans.  A word is a larger unit, long enough to contain an instruction or an integer, It may be 2-byte, 4-byte or 8 byte.
(7)What is meant by ASCII code?
Ans.  American National Standard Institute (ANSI) develop a table of 7-bit binary code to represent a text. It was called American Standard Code for Information Interchange.(ASCII).
2. Name the following:
(1)The smallest unit of digital storage and information – Bit.
(2)A group of 8 bits treated as a unit – Byte.
(3)A group of 2,4, or 8 bytes treated as a unit – Word.
3. State the following statements are true or false.
(1) The term bit coined from binary information technique. True
(2) In binary number, the place-value of the bit to the left of the unit position is 10. False
(3) The 8-bit byte can represent only 128 numbers. False
(4) The abbreviation for bit is the lower case letter b. True
(5) 1 kilobyte = 8192 bits. True
(6) Computer store text documents in RAM and on hard disk using ASCII codes. True.
(7) The ASCII code was developed by American National Standard Institute. True
4.Fill in the blanks:
(1)Binary have only possible values, 0 and 1.
(2)There are 8 bits in a byte.
(3)1 kilobyte of memory space can store 8192 bits.
(4)1 gigabyte= 1024 megabytes.
(5)Using only 7 bits initially, the number of printing and non- printing characters that ASCII code could represent was 128 numbers
(6)The decimal value of the space character in the ASCII code is 32.
(7)In the ASCII code, the decimal values of the capital letters of English alphabet rage from 65 to 90.
5. Convert the following binary numbers to decimal:
(1) (1001)2      : 9
(2) (100000)2  : 32
(3) (100001)2  : 33
(4) (10001)2    : 17
6. Convert the following decimal numbers to binary:
(1) (87)10                    :  110111
(2) (127)10                  :  1111111
(3) (245)10                  :  11110101

(4) (363)10                  :  1011010101