Computer Basics Interview Questions and Answers

Question: What is Binary?

Answer:

Binary numbers look strange when they are written out directly.This is because the digits weight increases by powers of 2, rather than by powers of 10. In a digital numeral, the digit furthest to the right is the ones digit; the next digit to the left is the twos digit; next comes the fours digit, then the eights digit, then the 16s digit, then the 32s digit, and so on.The decimal equivalent of a binary number can be found by summing all the digits.For example, the binary 10101 is equivalent to the decimal = 1x2⁰ + 0x2¹ + 1x2² + 0x2³ + 1x2⁴ = 1 + 4 + 16 = 21:

DECIMAL = 21	64	32	16	8	4	2	1
BINARY = 10101	0	0	1	0	1	0	1

The numbers from decimal 0 through 15 in decimal, binary, octal and hexadecimal form are listed below.

DECIMAL	BINARY	OCTAL	HEXA- DECIMAL
0	0000	0	0
1	0001	1	1
2	0010	2	2
3	0011	3	3
4	0100	4	4
5	0101	5	5
6	0110	6	6
7	0111	7	7
8	1000	10	8
9	1001	11	9
10	1010	12	A
11	1011	13	B
12	1100	14	C
13	1101	15	D
14	1110	16	E
15	1111	17	F

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