Class – 8th
Subject : Computer
L-
10 Binary Numbers
Book Exercise
8 bit = 1 Byte
1024bytes = 1 KB (Kilobyte)
1024KB = 1 MB (Megabyte)
1024MB = 1GB (Gigabyte)
1024 GB = 1TB ( Terabyte)
1024 TB = 1 PB ( Petabyte)
Write different number systems in positional systems based on
how many symbols
Binary - 2
different symbols - 0 & 1
Octal - 8 different
symbols - 0, 1, 2, 3, 4, 5, 6 and 7
Decimal - 10
different symbols - 0, 1, 2, 3, 4, 5, 6, 7, 8 and 9
Hexadecimal - 16
different symbols - 0,1,2,3,4,5, 6, 7, 8, 9, A, B, C, D, E and F
A. Multiple choice questions Choose the Correct Answer.
1) What is a bit?
a) A single piece of data
b) A single binary
digit R
c) The smallest storage unit of computer systems.
d)
A single transistor used to store binary information
2. What is binary number?
a) A machine language
(0's and 1's) R
b) A decimal number
c) a system of zeros.
d) All of these
3. What is a byte?
a) A byte consists of
eight bits R
b) A decimal number
c) A byte is a binary
digit
d) A binary number
4. What does 1+1 equals in binary.
a) Equal to 2
b) Equal to 0
c) Equal to 10 R
d) Equal to 11
5. The decimal number 187 is equivalent to binary number………………
a) (10111011)2 R
b) (11011101)2
c) (10111101)2
d) (10111100)2
6. Convert the following binary number (01011)2 to decimal.
a) 11 R
b) 35
c) 15
d) 010
7. The following binary number (10011010)2 is equal to ……………. In
decimal.
a)
154
b) 155
c)
153
d)
157
B. Fill in the blanks
1. The binary system consists of two digits zero (0) and one (1)
2. The decimal number system uses the digits from zero (0) to
nine (9) .
3. Computer numbers are zero (0) and one (1)
4. A simple electronic switch can represent both binary computer
numbers.
5. Only electricity signals that are just two ON and
OFF .
C. Add the following:-
1)
|
Binary |
|
Decimal |
|
1 0 1 1 1 |
23 |
|
|
1 1 1 1 |
15 |
|
|
0100110 |
38 |
2)
|
Binary |
|
Decimal |
|
1 1 0 0 1 1 |
51 |
|
|
1 0 1 1 0 |
22 |
|
|
01001001 |
73 |
D. Subtract the following:-
1)
|
Binary |
|
Decimal |
|
1 0 1 1 0 1 |
45 |
|
|
1 0 0 0 1 |
17 |
|
|
0 1 1 1 0
0 |
28 |
2)
|
Binary |
|
Decimal |
|
1 1 0 0 0 1 |
49 |
|
|
1 0 0 1 1 |
19 |
|
|
0 1 1 1 1
0 |
30 |
E. Answer the following questions:-
1. Name the different
number systems that a computer deals with.
Ans: There are different number systems in positional systems based
on how many symbols it has. Such as;
Binary - 2 different symbols - 0
& 1
Octal - 8 different symbols - 0, 1, 2, 3,
4, 5, 6 and 7
Decimal - 10 different symbols - 0,
1, 2, 3, 4, 5, 6, 7, 8 and 9
Hexadecimal - 16
different symbols - 0,1,2,3,4,5, 6, 7, 8, 9, A, B, C, D, E and F
2. What do you
understand by the binary number system?
Ans: Binary numbers system: Base=2. Thus, there are 2 Numbers: 0 and
1. A
Single binary number is called a Binary digit, or Bit, Group of 8 bit is called
byte.
3. What are the rules
to perform the following?
1. Binary addition
Ans:
2. Binary Subtraction
Ans:
Make a poster of rules of binary addition and subtraction.
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