Samacheer Kalvi 11th Computer Science Chapter 2 Number Systems Notes PDF Download: Tamil Nadu STD 11th Computer Science Chapter 2 Number Systems Notes 
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Samacheer Kalvi 11th Computer Science 
Subject 
11th Computer Science 
Chapter 
Chapter 2 Number Systems 
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PART – 1
I. Choose The Correct Answer
11th Computer Science Chapter 2 Book Back Answers Question 1.
Which refers to the number of bits processed by a computer’s CPU?
(a) Byte
(b) Nibble
(c) Word length
(d) Bit
Answer:
(c) Word length
11th Computer Science Chapter 2 Question 2.
How many bytes does 1 KiloByte contain?
(a) 1000
(b) 8
(c) 4
(d) 1024
Answer:
(d) 1024
Class 11 Computer Science Chapter 2 Question Answer Question 3.
Expansion for ASCII ………………..
(а) American School Code for Information Interchange
(b) American Standard Code for Information Interchange
(c) All Standard Code for Information Interchange
(d) American Society Code for Information Interchange
Answer:
(b) American Standard Code for Information Interchange
11th Computer Science 2nd Lesson Book Back Answers Question 4.
2^50 is referred as
(a) Kilo
(b) Tera
(c) Peta
(d) Zetta
Answer:
(c) Peta
Samacheer Kalvi Guru 11th Computer Science Question 5.
How many characters can be handled in Binary Coded Decimal System?
(a) 64
(b) 255
(c) 256
(d) 128
Answer:
(a) 64
11th Computer Science 2nd Lesson Question 6.
For 1101_{2} what is the Hexadecimal equivalent?
(a) F
(b) E
(c) D
(d) B
Answer:
(c) D
Questions On Number System Class 11 Computer Science Question 7.
What is the 1’s complement of 00100110?
(a) 00100110
(b) 11011001
(c) 11010001
(d) 00101001
Answer:
(b) 11011001
Class 11 Computer Science Chapter 2 Pdf Question 8.
Which amongst this is not an Octal number?
(a) 645
(b) 234
(c) 876
(d) 123
Answer:
(c) 876
II. Short Answers
Class 11 Computer Science Chapter 2 Solutions Question 1.
What is data?
Answer:
The data is a fact about people, places, or some object. In a program, a value assigned to a variable is called data.
Samacheer Kalvi Guru 11 Computer Science Question 2.
Write the 1’s complement procedure.
Answer:
Step 1: convert given decimal number into Binary
Step 2: if the binary bit contains 8 bits if less add 0 at the left most bit, to make it 8 bits.
Step 3: Invert all the bits, (i.e.) change 1 as 0 and 0 as 1.
Samacheer Kalvi.Guru 11th Computer Science Question 3.
Convert (46)_{10} into a Binary number
Answer:
(46)_{10} into binary = 101110_{2}
Computer Science Chapter 2 Question 4.
We cannot find 1’s complement for (28)_{10}. State reason.
Answer:
Complement is only for negative numbers. (28)_{10} is a positive number. So we can’t find 1’s complement.
Class 11 Computer Science Chapter 2 Notes Question 5.
List the encoding systems for characters in memory.
Answer:
 BCD – Binary Coded Decimal
 EBCDIC – Extended Binary Coded Decimal Interchange Code
 ASCII – American Standard Code for Information Interchange
 Unicode
 ISCII – Indian standard code for information interchange
III. Explain in Brief
Question 1.
What is the radix of a number system? Give example.
Answer:
The radix refers to the base of a number system: the total number of possible digits. The decimal number system that we all use is base ten, as it has ten distinct digits (0, 1, 2, 3, 4, 5, 6, 7, 8, 9).
Example: Binary system – Radix 2
Question 2.
Write a note on the binary number system.
Answer:
In Binary Number System, there are only two digits namely 0 and 1. The numbers in the binary system are represented to the base 2. In the Binary Number, the leftmost bit is the Most Significant Bit (MSB) and the rightmost bit is the Least Significant Bit (LSB). MSB has largest positional weight and LSB has the smallest positional weight.
Example: 110010_{2}
Question 3.
Convert (150)_{10} into Binary, then convert that Binary number to Octal.
Step 1:
Change it to Binary.
(150)_{10} = 10010110
Step – 2:
Change it to Octal.
Answer:
Binary 10010110_{2}
Octal 226_{g}
Question 4.
Write a short note on ISCII.
Answer:
Indian Standard Code for Information Interchange (ISCII).
ISCII is the system of handling the character of Indian local languages. This is an 8bit coding system. Therefore it can handle 256 (28) characters.
The supported scripts are:
Assamese, Bengali (Bangla), Devanagari, Gujarati, Gurmukhi, Kannada, Malayalam, Oriya, Tamil, and Telugu. ISCII does not encode the writing systems of India based on Arabic, but its writing system switching codes none the less provide for Kashmiri, Sindhi, Urdu, Persian, Pashto and Arabic. The Arabic – based writing systems were subsequently encoded in the PASCII encoding.
ISCII is an 8 – bit encoding. The lower 128 code points are plain ASCII, the upper 128 code points are ISCII – specific. In addition to the code points representing characters, ISCII makes use of a code point with mnemonic ATR that indicates that the following byte contains one of two kinds of information. One set of values changes the writing system until the next writing system indicator or end – of – line.
Question 5.
Add (a) – 22_{10} + 15_{10}
(b) 20_{10} + 25_{10Answer:(a) – 2210 = 101102Binary Equivalent = 101102Answer:111110012}
(b) 20_{10} + 25_{10}
Answer:
Answer:
00101101_{2}
IV. Detail Answers
Question 1.
(a) Write the procedure to convert fractional Decimal to Binary.
(b) Convert (98.46)_{10} to Binary
Answer:
(а) Procedure to convert fractional Decimal to Binary.
Step 1: Multiply the decimal fraction by 2 and note the integer part. The integer part is either 0 or 1.
Step 2: Discard the integer part of the previous product. Multiply the fractional part of the previous product by 2. Repeat step 1 until the same fraction repeats or terminates (0).
Step 3: The resulting integer part forms a sequence of 0’s and 1 ’s that becomes the binary equivalent of a decimal fraction.
Step 4: The final answer is to be written from the first integer part obtained till the last integer part obtained.
(b) Convert (98.46)_{10} to Binary
Answer:
1100010.01110 … _{2}
Question 2.
Find 1’s Complement and 2’s Complement for the following Decimal number
(a) 98
(b) 135
Answer:
98_{10} = 01100010
8 bit format = 01100010
1’s complement = 10011101
Add 1 bit = +1 = 10011110
135_{10} = 10000111
1’st complement = 01111000
Add 1 bit = + 1
= 01111001
Question 3.
(a) Add 1101010_{2} + 101101_{2}
(b) Subtract 1101011_{2} – 111010_{2}
Answer:
PART – 1
I. Choose the correct answer
Question 1.
Which is a basic electronic circuit which operates on one or more signals?
(a) Boolean algebra
(b) Gate
(c) Fundamental gates
(d) Derived gates
Answer:
(b) Gate
Question 2.
Which gate is called the logical inverter?
(a) AND
(b) OR
(c) NOT
(d) XNOR
Answer:
(c) NOT
Question 3.
A + A = ?
(a) A
(b) O
(c) 1
(d) A
Answer:
(a) A
Question 4.
NOR is a combination of?
(a) NOT(OR)
(b) NOT(AND)
(c) NOT(NOT)
(d) NOT(NOR)
Answer:
(a) NOT(OR)
Question 5.
NAND is called as ……………… Gate.
(a) Fundamental Gate
(b) Derived Gate
(c) Logical Gate
(d) Electronic gate
Answer:
(b) Derived Gate
PART – 2
II. Short Answers
Question 1.
What is Boolean Algebra?
Answer:
Boolean algebra is a mathematical discipline that is used for designing digital circuits in a digital computer. It describes the relationship between inputs and outputs of a digital circuit.
Question 2.
Write a short note on NAND Gate.
Answer:
The NAND gate is the combination of NOT and AND gates. The NAND gate is generated by inverting the output of a AND gate. The algebraic expression of the NAND is Y = A.B¯¯¯¯¯¯¯¯¯
Question 3.
Draw the truth table for the XOR gate.
Answer:
The truth table for XOR gate is
Question 4.
Write the associative laws?
Answer:
Associative Laws:
i) A + (B + C) = (A + B) + C
ii) A . (B . C) = (A . B) . C
Question 5.
What are derived gates?
Answer:
Derived Gates are the gates that are derived from the fundamental gates.
Example: NAND, NOR, XOR, XNOR
PART – 3
III. Explain in Brief
Question 1.
Write the truth table of fundamental gates.
Answer:
(a) AND gate – Truth Table
(b) OR gate – Truth Table
(c) NOT Gate – Truth Table
Question 2.
Write a short note on XNOR gate.
The XNOR (exclusive – NOR) gate is a combination of XOR gate followed by an inverter. Its output is “true” if the inputs are same and false if the inputs are different.
The output of XNOR is C = AB + A¯¯¯¯ B¯¯¯¯
= A ⊙ B
Where ⊙ indicates included dot.
Truth Table:
Logic symbol:
Logic circuit:
Question 3.
Reason out why the NAND and NOR are called universal gates?
Answer:
NAND and NOR gates are called Universal gates because the fundamental logic gates can be realized through them.
Question 4.
Give the truth table of XOR gate.
Answer:
XOR – Truth Table
Question 5.
Write the De Morgan’s law.
Answer:
De Morgan’s laws
i)A+B¯¯¯¯¯¯¯¯¯¯¯¯¯=A¯¯¯¯⋅B¯¯¯¯ii)(A¯⋅B)=A¯+B¯
PART – 4
IV. Explain in Detail
Question 1.
Explain the fundamental gates with an expression and truth table.
Answer:
the gate is a basic electronic circuit that operates on one or more signals to produce an output signal.
The three fundamental gates are AND, OR, and NOT gates.
AND Gate:
The AND gate can have two or more input signals and produce an output signal. The output is “true” only when both inputs are “true”, otherwise, the output is “false”. In other words, the output will be 1 if and only if both inputs are 1; otherwise, the output is 0. The output of the AND gate is represented by a variable say C, where A and B are two and if input boolean variables. In boolean algebra, a variable can take either of the values ‘0’ or ‘1’. The logical symbol of the AND gate is
The truth table for AND gate is
OR Gate:
The OR gate gets its name from its behaviour like the logical inclusive “OR”. The output is “true” if either or both of the inputs are “true”. If both inputs are “false” then the output is “false”. In other words the output will be 1 if and only if one or both inputs are 1; otherwise, the output is 0. The logical symbol of the OR gate is
The truth table for OR gate is
NOT Gate:
The NOT gate, called a logical inverter, has only one input. It reverses the logical state. In other words, the output C is always the complement of the input. The logical symbol of the NOT gate is
The truth table for NOT gate is
Question 2.
How AND and OR can be realized using NAND and NOR gate.
Bubbled AND Gate
(i) Realized of and using only AND gate:
The Boolean function for AND is C = AB. The same can be realized using only NAND gates.
(ii) Realization of or using only NAND’s:
The Boolean function of OR is C = A + B. The same can be realized using only NAND gates.
(iii) Realization of AND using NOR:
By using only the NOR gates, we can get the output equivalent to the output of AND gate.
C = A.B
(iv) Realization of OR using NOR’s:
By using only NOR gates we are getting the output equivalent to OR gate.
Question 3.
Explain the Derived gates with expression and truth table.
Answer:
The logic gates like NAND, NOR, XOR, and XNOR are derived gates which are derived from the fundamental gates AND, OR NOT.
(i) NAND gate:
The NAND is the combination of NOT and AND. The NAND is generated by inverting the output of an AND operation.
Output: y = AB¯¯¯¯¯¯¯
Logic circuit
Logic symbol:
Truth table:
Inputs Outputs
(ii) NOR gate:
The NOR is the combination of NOT and OR. The NOR is generated by inverting the output of an OR operation.
Logic function: y = AB¯¯¯¯¯¯¯
Logic circuit:
logic symbol:
Truth table:
(iii) XOR gate:
The XOR (exclusive – OR) gate acts in the same way as the logical either /or.
Logic symbol:
Logic circuit:
Truth table:
(iv) XNOR gate:
XNOR gate (exclusive – NOR) gate is a combination of XOR gate followed by an inverter.
Logic function: y = AB¯¯¯¯¯¯¯
logic symbol:
Truth table:
Boolean function:
Samacheer Kalvi 11th Computer Science Number Systems Additional Questions and Answers
PART – 1
I. Choose the correct answer
Question 1.
Computer handles data in the form of ________________
a) 1
b) 0
c) alphabets
d) both A and B
Answer:
d) both A and B
Question 2.
The term data comes from the word ………………..?
(a) number
(b) datum
(c) nibble
(d) bit
Answer:
(b) datum
Question 3.
0 and 1 are called________________
a) BIT
b) BYTE
c) NIBBLE
d) WORD
Answer:
a) BIT
Question 4.
……………….. scheme is denoted by hexadecimal numbers.
(a) binary
(b) Unicode
(c) word length
(d) data
Answer:
(b) Unicode
Question 5.
A_________ is the short form of Binary digit.
a) BIT
b) BYTE
c) NIBBLE
d) WORD
Answer:
a) BIT
Question 6.
A ……………….. number is represented using base 16.
(a) Hexadecimal
(b) octal
(c) binary
(d) decimal
Answer:
(a) Hexadecimal
Question 7.
A________ is a collection of 4 bits.
a) BIT
b) BYTE
c) NIBBLE
d) WORD
Answer:
c) NIBBLE
Question 8.
Octal number system uses digits ………………..
(a) 7
(b) 5
(c) 8
(d) 10
Answer:
(c) 8
Question 9.
The memory size of the computer is measured in the unit called __________
a) BIT
b) BYTE
c) NIBBLE
d) WORD
Answer:
b) BYTE
Question 10.
The NAND gate operates an AND gate followed by a ……………….. gate.
(a) AND
(b) OR
(c) NOT
(d) XOR
Answer:
(c) NOT
Question 11.
The word length of the present day computer is __________ bits.
a) 32
b) 64
c) 8
d) 32 or 64
Answer:
d) 32 or 64
Question 12.
Expand BIT.
(a) Basic Input Term
(b) Binary Input Term
(c) Binary Digit
(d) Binary Inverse Digit
Answer:
(c) Binary Digit
Question 13.
_________is not a valid word length of a computer.
a) 8
b) 12
c) 4
d) both B and C
Answer:
d) both B and C
Question 14.
Identify the wrong pair.
1. 1 YB = 2^80
2. 1 BM = 2^70
3. 1 MB = 2^20
4. 1 TM = 2^40
(a) 2
(b) 3
(c) 4
(d) 1
Answer:
(a) 2
Question 15.
1 MegaByte equals t______ KiloBytes.
a) 1024
b) 256
c) 1000
d) 128
Answer:
a) 1024
Question 16.
The collection of 4 bits is ………………..
(a) bit
(b) byte
(c) nibble
(d) KB
Answer:
(c) nibble
Question 17.
Match the following.
(a) 4 12 3
(b) 12 3 4
(c) 4 3 2 1
(d) 4 2 1 3
Answer:
(a) 4 12 3
Question 17.
1024 GigaByte equals to
a) 1 GigaByte
b) 1 TeraByte
c) 1 YottaByte
d) None of these
Answer:
b) 1 TeraByte
Question 19.
1 MB equals to ________ bytes.
a) 2^{10}
b) 2^{20}
c) 2^{30}
d) 2^{40}
Answer:
b) 2^{20}
Question 20.
What is the decimal value of 1111_{2}?
(a) 10
(b) 11
(c) 14
(d) 15
Answer:
(d) 15
Question 21.
1 TB equals to_______ bytes
a) 2^{10}
b) 2^{20}
c) 2^{30}
d) 2^{40}
Answer:
d) 2^{40}
Question 22.
The decimal value of Binary number 10 is ………………..
(a) 101010
(b) 2
(c) 100
(d) A
Answer:
(b) 2
Question 23.
1 ExaByte (1EB) equals to _________ bytes
a) 2^{50}
b) 2^{60}
c) 2^{70}
d) 2^{80}
Answer:
b) 2^{60}
Question 24.
Which of the following are data?
(a) Alphabet
(b) Special character
(c) Number
(d) All of these
Answer:
(d) All of these
Question 25.
1 YottaByte equals to_________ bytes.
a) 2^{50}
b) 2^{60}
c) 2^{70}
d) 2^{80}
Answer:
d) 2^{80}
Question 26.
Pick the odd one.
(a) BCD
(b) ENIAC
(c) ASCII
(d) EBCDIC
Answer:
(b) ENIAC
Question 27.
________are used to represent characters in a text.
a) Bytes
b) Bits
c) Nibbles
d) None of these
Answer:
a) Bytes
Question 28.
Unicode can handles how many characters?
(a) 64
(b) 128
(c) 256
(d) 65536
Answer:
(d) 65536
Question 29.
ASCII is a _________ bit code.
a) 8
b) 7
c) 16
d) 32
Answer:
b) 7
Question 30.
Which one is the rightmost bit?
(a) MSB
(b) LSB
(c) USB
(d) USRB
Answer:
(b) LSB
Question 31.
The ASCII value for Numeric 0(zero) is_______
a) 48
b) 38
c) 128
d) 32
Answer:
a) 48
Question 32.
The leftmost bit of a positive binary number in signed notation is ………………..
(a) 0
(b) 1
(c) 2
(d) A
Answer:
(a) 0
Question 33.
Each number system is uniquely identified by its _________
a) base value
b) radix
c) base value or radix
d) symbols
Answer:
c) base value or radix
Question 34.
The radix for the octal number system is ………………..
(a) 2
(b) 8
(c) 1
(d) 16
Answer:
(b) 8
Question 35.
_________is the general idea behind positional numbering system.
a) base value
b) radix
c) base or radix
d) symbols
Answer:
c) base or radix
Question 36.
Which one of the following companies have formulated EBCDIC?
(a) Microsoft
(b) 1 BM
(c) Sun
(d) Apple
Answer:
(b) 1 BM
Question 37.
The leftmost bit in the binary number is called the _________
a) MSB
b) LSB
c) FSB
d) None of these
Answer:
a) MSB
Question 38.
The base value of a hexadecimal number is ………………..
(a) 2
(b) 8
(c) 16
(d) 18
Answer:
(c) 16
Question 39.
Each octal digit has its own positional value or weight as a power of _________
a) 8
b) 16
c) 4
d) 10
Answer:
a) 8
Question 40.
How many truth values are there?
(a) 2
(b) 3
(c) 4
(d) 5
Answer:
(a) 2
Question 41.
_______system is used to represent data in a more compact manner.
a) Hexadecimal
b) Octal
c) Decimal
d) None of these
Answer:
a) Hexadecimal
Question 42.
The variables which can store the truth values are called………………..
(a) logical variable
(b) binaryvalued variable
(c) boolean variables
(d) all of these
Answer:
(d) all of these
Question 43.
How many methods are there to convert decimal numbers to binary numbers?
a) only one
b) 2
c) 3
d) many
Answer:
b) 2
Question 44.
Which is not a logical operator?
(a) dot
(b) plus
(c) over bar
(d) command
Answer:
(d) command
Question 45.
Computer can handle _______numbers.
a) positive
b) negative
c) positive and negative
d) None of these
Answer:
c) positive and negative
Question 46.
Which symbol is used in the OR operator?
(a) –
(b) •
(c) *
(d) +
Answer:
(d) +
Question 47.
The simplest method to represent negative binary numbers is called_______method.
a) 1’s complement
b) 2’s complement
c) signed magnitude
d) All the above
Answer:
c) signed magnitude
Question 48.
Which among the following can be replaced by a bubbled AND gate?
(a) AND
(b) NAND
(c) OR
(d) not
Answer:
(b) NAND
Question 49.
How many ways a number can be represented in computers?
a) 3
b) 2
c) only one
d) None of these
Answer:
a) 3
Question 50.
Find the universal gates from the following.
(a) XOR
(b) XNOR
(c) a and b
(d) NOR
Answer:
(d) NOR
Question 51.
If the number has _______sign, it will be considered as positive in signed magnitude representation.
a) +
b) no
c) + or ++
d) A or B
Answer:
d) A or B
Question 52.
Which symbol is used in the XOR gate?
(a) ⊙
(b) ⊗
(c) ⊕
(d) –
Answer:
(c) ⊕
Question 53.
Included dot means ………………..
(a) ⊙
(b) [•]
Answer:
(a) ⊙
Question 53.
1’s complement of (00011000)2 is _______
a) 11100111
b) 00011001
c) 00000011
d) None of these
Answer:
a) 11100111
Question 55.
Identify the statement which is wrong.
(a) A . 1 = A
(b) A . A = A
(c) A + O = A
(d) A . 1 = 0
Answer:
(b) A . A = A
Question 55.
The binary numbers permits _______ computation.
a) addition and subtraction
b) multiplication
c) division
d) all the above
Answer:
d) all the above
Question 57.
Identify the statements which are true.
(i) A + 0 = A
(ii) A.A = A
(iii) A + A¯¯¯¯ = 1
(iv) A. O = O
(a) (iii) (iv) are true
(b) (i) (ii) are true
(c) (i) (ii) (iii) are true.
(d) all are true
Answer:
(d) all are true
Question 58.
All the characters in the character set are denoted through_______only.
a) numbers
b) alphanumeric
c) alphabet
d) None of these
Answer:
a) numbers
Question 59.
Match the following
(a) 3 4 2 1
(b) 1 2 3 4
(c) 4 3 2 1
(d) 3 4 1 2
Answer:
(a) 3 4 2 1
Question 60.
BCD stands for _______
a) Binary Coded Decimal
b) Binary Character Decoding
c) Basic Coded Decimal
d) Bit Coded Decimal
Answer:
a) Binary Coded Decimal
PART – 2
II. Short Answers
Question 1.
Define data.
Answer:
Data is an unprocessed collection of facts given as input to the computer. In a program, the values assigned to the variables are called data.
Question 2.
Expand ASCII.
Answer:
American Standard Code for Information Interchange
Question 3.
What do you mean by nibble?
Answer:
A nibble is a collection of 4 bits binary digits.
Question 4.
What is MSB and LSB?
Answer:
MSB means Most Significant Bit; LSBLeast Significant Bit
Question 5.
What do you mean by word length?
Answer:
Word length refers to the number of bits processed by a Computer’s CPU. For example, a word length can have 8 bits, 16 bits, 32 bits, and 64 bits.
Question 6.
Define word length?
Answer:
Word length refers to the number of bits processed by a computer’s CPU.
Question 7.
Write note on number system.
Answer:
A numbering system is a way of representing numbers. The most commonly used numbering system in real life is the Decimal number system. Other number systems are Binary, Octal, and Hexadecimal Number System.
Question 8.
How will you convert a number from octal to Binary?
Answer:
For each octal digit in the given number write its 3 digits binary equivalent using positional notation.
Question 9.
Why the computers are working at different speeds?
Answer:
The speed of a computer depends on the number of bits it can process at once. For example, a 64 bit computer can process 64bit numbers in one operation, while a 32bit computer breaks 64 bit numbers down into smaller pieces, making it slower.
Question 10.
Write a short note on BCD.
Answer:
 BCD stands for Binary Coded Decimal system.
 BCD is a 26bit encoding system.
 IT can handle 64 characters.
PART – 3
III. Explain in Brief
Question 1.
What is a binary number system?
Answer:
There are only two digits in the Binary system, namely, 0 and 1. The numbers in the binary system are represented to the base 2 and the positional multipliers are the powers of 2. The leftmost bit in the binary number is called as the Most Significant Bit (MSB) and it has the largest positional weight. The rightmost bit is the Least Significant Bit (LSB) and has the smallest positional weight.
Example:
The binary sequence (11101)_{2} has the decimal equivalent:
(1101)_{2} = 1 x 2^{3} + 1 x 2^{2} + 0 x 2^{1} + 1 x 2^{0}
= 8 + 4 + 0 + 1
= (13)_{10}
Question 2.
Explain the Hexadecimal number system.
Answer:
A hexadecimal number is represented using base 16. Hexadecimal or Hex numbers are used as a shorthand form of a binary sequence. This system is used to represent data in a more compact manner. Since 16 symbols are used, 0 to F, the notation is called hexadecimal.
The first 10 symbols are the same as in the decimal system, 0 to 9, and the remaining 6 symbols are taken from the first 6 letters of the alphabet sequence, A to F, where A represents 10, B is 11, C is 12, D is 13, E is 14 and F is 15.
Question 3.
What is a decimal number system?
Answer:
It consists of 0, 1, 2, 3, 4, 5, 6, 7, 8, 9(10 digits). It is the oldest and most popular number system used in our day to day life. In the positional number system, each decimal digit is weighted relative to its position in the number. This means that each digit in the number is multiplied by 10 raised to a power corresponding to that digit’s position.
Example:
(123)_{10} = (1 x 10^{2}) + (2 x 10^{1}) + (3 x 10^{0})
= 100 + 20 + 3
= (123)_{10}
Question 4.
Write the distributive law.
Answer:
A . (B + C) = A . B + A . C
A + (B . C) = (A + B) . (A + C)
Question 5.
What is the truth table?
Answer:
A truth table represents all the possible values of logical variables or statements along with all the possible results of a given combination of truth values.
PART – 4
IV. Explain in Detail
Question 1.
Explain the different types of number systems?
Answer:
Different Types of Number Systems
A numbering system is a way of representing numbers. The most commonly used numbering system in real life is the Decimal number system. Other number systems are the Binary, Octal, Hexadecimal number systems. Each number system is uniquely identified by its base value or radix. Radix or base is the count of a number of digits in each number system. Radix or base is the general idea behind the positional numbering system.
Decimal Number System:
It consists of 0, 1, 2, 3, 4, 5, 6, 7, 8, 9(10 digits). It is the oldest and most popular number system used in our daytoday life. In the positional number system, each decimal digit is weighted relative to its position in the number. This means that each digit in the number is multiplied by 10 raised to a power corresponding to that digit’s position.
Example:
(123)_{10} = 1 x 10^{2} + 2 x 10^{1} + 3 x 10^{0}
= 100 + 20 + 3
= (123)_{10}
Binary Number System:
There are only two digits in the Binary system, namely, 0 and 1. The numbers in the binary system are represented to the base 2 and the positional multipliers are the powers of 2. The leftmost bit in the binary number is called the Most Significant Bit (MSB) and it has the largest positional weight. The rightmost bit is the Least Significant Bit (LSB) and has the smallest positional weight.
Example:
The binary sequence (1101)_{2} has the decimal equivalent:
(1101)_{2} = 1 x 2^{3} + 1 x 2^{2} + 0 x 2^{1} + 1 x 2^{0}
= 8 + 4 + 0 + 1
= (13)_{10}
Octal Number System:
Octal number system uses digits 0,1,2,3,4,5,6 and 7 (8 digits). Each octal digit has its own positional value or weight as a power of 8.
Example:
The Octal sequence (547)_{8} has the decimal equivalent:
(547)_{8} = 5 x 8^{2} + 4 x 8^{2} + 7 x 8^{0}
= 5 x 64 + 4 x 8 + 7 x 1
= 320 + 32 + 7
= (359)_{10}
Hexadecimal Number System:
A hexadecimal number is represented using base 16. Hexadecimal or Hex numbers are used as a shorthand form of a binary sequence. This system is used to represent data in a more compact manner. Since 16 symbols are used, 0 to F, the notation is called hexadecimal. The first 10 symbols are the same as in the decimal system, 0 to 9, and the remaining 6 symbols are taken from the first 6 letters of the alphabet sequence, A to F, where A represents 10, B is 11, C is 12, D is 13, E is 14 and F is 15.
Question 2.
Explain the octal to decimal conversion and hexadecimal to decimal conversion.
Answer:
Octal to Decimal Conversion:
To convert Octal to Decimal, we can use the positional notation method.
 Write down the Octal digits and list the powers of 8 from right to left(Positional Notation).
 For each positional notation of the digit write the equivalent weight.
 Multiply each digit with its corresponding weight.
 Add all the values.
Example:
Convert (1265)_{8} to an equivalent Decimal number
(1265)_{8} = 512 x 1 + 64 x 2 + 8 x 6 + 1 x 5
= 512 + 128 + 48 + 5
(1265)_{8} = (693)_{10}
Hexadecimal to Decimal Conversion:
To convert Hexadecimal to Decimal we can use the positional notation method.
 Write down the Hexadecimal digits and list the powers of 16 from right to left (Positional Notation).
 For each positional notation written for the digit, now write the equivalent weight.
 Multiply each digit with its corresponding weight.
 Add all the values to get one final value.
Example:
Convert (25F)_{16} into its equivalent Decimal number.
Question 3.
Explain the binary addition and binary subtraction
Answer:
Binary Addition:
The following table is useful when adding two binary numbers.
Example Add: 1011_{2} + 1001_{2}
Example: Perform Binary addition for the following:
23_{10} + 12_{10}
Step 1: Convert 23 and 12 into binary form
Step 2: Binary addition of 23 and 12:
Binary Subtraction:
The table for Binary Subtraction is as follows:
When subtracting 1 from 0, borrow 1 from the next Most Significant Bit, when borrowing from the next Most Significant Bit, if it is 1, replace it with 0. If the next Most Significant Bit is 0, you must borrow from a more significant bit that contains 1 and replace it with 0, and 0s upto that point become 1’s.
Example: Subtract 1001010_{2} – 10100_{2}
Example Perform binary addition for the following: (21)_{10} + (5)_{10}
Step 1: Change – 21 and 5 into binary form
Step 2:
Step 3:
Binary Addition of – 21 and 5:
Question 4.
Explain the theorems of boolean algebra.
Answer:
Theorems of Boolean Algebra:
Identity:
A + 0 = A
A. 1 = A
Complement:
A + A¯¯¯¯ = 1
A. A¯¯¯¯ = 0
Commutative:
A + B = B + A
A. B = B .A
Associative:
A + (B + C) = (A + B) + C
A. (B . C) = (A. B). C
Distributive
A. (B + C) = A B + A. C
A + (B . C) = (A + B). (A + C)
Null Element:
A + 1 = 1
A. 0 = 0
Involution
(A=) = A
Indempotence:
A +A = A
A.A = A
Absorption:
A + (A . B) = A
A . (A + B) = A
3rd Distributive:
A + A¯¯¯¯. B = A + B
De Morgan’s:
A+B¯¯¯¯¯¯¯¯¯¯¯¯¯ = A¯¯¯¯.B¯¯¯¯
(A.B¯¯¯¯¯¯¯¯¯) = A¯¯¯¯ + B¯¯¯¯
How to Prepare using Samacheer Kalvi 11th Computer Science Chapter 2 Number Systems Notes PDF?
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Samacheer Kalvi 11th Computer Science All Chapter Notes PDF Download
 Samacheer Kalvi 11th Computer Science Chapter 1 Introduction to Computers Notes PDF Download: Tamil Nadu STD 11th Computer Science Chapter 1 Introduction to Computers Notes
 Samacheer Kalvi 11th Computer Science Chapter 2 Number Systems Notes PDF Download: Tamil Nadu STD 11th Computer Science Chapter 2 Number Systems Notes
 Samacheer Kalvi 11th Computer Science Chapter 3 Computer Organization Notes PDF Download: Tamil Nadu STD 11th Computer Science Chapter 3 Computer Organization Notes
 Samacheer Kalvi 11th Computer Science Chapter 4 Theoretical Concepts of Operating System Notes PDF Download: Tamil Nadu STD 11th Computer Science Chapter 4 Theoretical Concepts of Operating System Notes
 Samacheer Kalvi 11th Computer Science Chapter 5 Working with Typical Operating System (Windows & Linux) Notes PDF Download: Tamil Nadu STD 11th Computer Science Chapter 5 Working with Typical Operating System (Windows & Linux) Notes
 Samacheer Kalvi 11th Computer Science Chapter 6 Specification and Abstraction Notes PDF Download: Tamil Nadu STD 11th Computer Science Chapter 6 Specification and Abstraction Notes
 Samacheer Kalvi 11th Computer Science Chapter 7 Composition and Decomposition Notes PDF Download: Tamil Nadu STD 11th Computer Science Chapter 7 Composition and Decomposition Notes
 Samacheer Kalvi 11th Computer Science Chapter 8 Iteration and Recursion Notes PDF Download: Tamil Nadu STD 11th Computer Science Chapter 8 Iteration and Recursion Notes
 Samacheer Kalvi 11th Computer Science Chapter 9 Introduction to C++ Notes PDF Download: Tamil Nadu STD 11th Computer Science Chapter 9 Introduction to C++ Notes
 Samacheer Kalvi 11th Computer Science Chapter 10 Flow of Control Notes PDF Download: Tamil Nadu STD 11th Computer Science Chapter 10 Flow of Control Notes
 Samacheer Kalvi 11th Computer Science Chapter 11 Functions Notes PDF Download: Tamil Nadu STD 11th Computer Science Chapter 11 Functions Notes
 Samacheer Kalvi 11th Computer Science Chapter 12 Arrays and Structures Notes PDF Download: Tamil Nadu STD 11th Computer Science Chapter 12 Arrays and Structures Notes
 Samacheer Kalvi 11th Computer Science Chapter 13 Introduction to ObjectOriented Programming Techniques Notes PDF Download: Tamil Nadu STD 11th Computer Science Chapter 13 Introduction to ObjectOriented Programming Techniques Notes
 Samacheer Kalvi 11th Computer Science Chapter 14 Classes and Objects Notes PDF Download: Tamil Nadu STD 11th Computer Science Chapter 14 Classes and Objects Notes
 Samacheer Kalvi 11th Computer Science Chapter 15 Polymorphism Notes PDF Download: Tamil Nadu STD 11th Computer Science Chapter 15 Polymorphism Notes
 Samacheer Kalvi 11th Computer Science Chapter 16 Inheritance Notes PDF Download: Tamil Nadu STD 11th Computer Science Chapter 16 Inheritance Notes
 Samacheer Kalvi 11th Computer Science Chapter 17 Computer Ethics and Cyber Security Notes PDF Download: Tamil Nadu STD 11th Computer Science Chapter 17 Computer Ethics and Cyber Security Notes
 Samacheer Kalvi 11th Computer Science Chapter 18 Tamil Computing Notes PDF Download: Tamil Nadu STD 11th Computer Science Chapter 18 Tamil Computing Notes
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