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Ncert solutions for class 11 Computer Science Python Chapter 3 Data Representation are prepared by CBSE student eCARE expert to score good marks in class 11. Classes 11 Computer Science Python Chapter 3 Data Representation contain many topics which are very important to score good in class 11. There are some important topic mentioned below:

Octal (base 8) was previously a popular choice for representing digital circuit numbers in a form that is more compact than binary. Octal is sometimes abbreviated as oct. Octal counting goes as :

0,1, 2, 3,4, 5, 6, 7,10,11,12,13,14,15,16,17,20, 21 and so on.

Hexadecimal (base 16) is currently the most popular choice for representing digital circuit numbers in a form that is more compact than binary. Hexadecimal numbers are sometimes represented by preceding the value with ‘Ox’, as in 0x1 B84. Hexadecimal is sometimes abbreviated as hex. Hexadecimal counting goes :

0,1,2, 3,4,5, 6, 7, 8,9, A, B, C, D, E, F, and so on.

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**Question**

Explain decimal and binary number.

**Answer:**

Decimal (base 10) is the way most human beings represent numbers. Decimal is sometimes abbreviated as dec. Decimal counting goes :

0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18 and so on.

Binary (base 2) is the natural way most digital circuits represent and manipulate numbers. Binary numbers are sometimes represented by preceding the value with ‘Ob’, as in Ob1O11. Binary is sometimes abbreviated as bin.

Binary counting goes as : 0,1,10,11,100,101,110,

111, 1000, 1oo1, 1010,1011, 11oo, 1101, 1110, 1111,10000,10001 and so on.

**Question**

Explain octal and hexadecimal number.

**Answer:**

Octal (base 8) was previously a popular choice for representing digital circuit numbers in a form that is more compact than binary. Octal is sometimes abbreviated as oct. Octal counting goes as :

0,1, 2, 3,4, 5, 6, 7,10,11,12,13,14,15,16,17,20, 21 and so on.

Hexadecimal (base 16) is currently the most popular choice for representing digital circuit numbers in a form that is more compact than binary. Hexadecimal numbers are sometimes represented by preceding the value with ‘Ox’, as in 0x1 B84. Hexadecimal is sometimes abbreviated as hex. Hexadecimal counting goes :

0,1,2, 3,4,5, 6, 7, 8,9, A, B, C, D, E, F, and so on.

**Question**

What is ASCII ?

**Answer:**

It is acronym for the American Standard Code for Information Interchange. It is used in most microcomputers and minicomputers and in many mainframes. It is a 7-bit code so it has 27 = 128 possible code groups.

**Question**

What is ISCII ?

**Answer:**

It is acronym for Indian Standard Code for Information Interchange. It is a 8-bit code so it has 28 = 256 possible code groups. It retains all ASCII characters and offers codng for Indian characters also.

**Question**

What do you understand by Unicode ?

**Answer:**

It is the new universal coding standard being adopted all newer platforms. Unicode provides a unique number for every character, no matter what the platform or program or the language is.

**Question**

Expand the following:

**1.** ASCII

**2. **ISCII

**Answer:**

**ASCII:**American Standard Code for Information Interchange.**ISCII :**Indian Standard Code for Information Interchange.