Data Representation Class 11 Computer Science Exam Questions

Please refer to Data Representation Class 11 Computer Science Exam Questions provided below. These questions and answers for Class 11 Computer Science have been designed based on the past trend of questions and important topics in your class 11 Computer Science books. You should go through all Class 11 Computer Science Important Questions provided by our teachers which will help you to get more marks in upcoming exams.

Class 11 Computer Science Exam Questions Data Representation

Class 11 Computer Science students should read and understand the important questions and answers provided below for Data Representation which will help them to understand all important and difficult topics.

Question: Covert the following Decimal numbers to binary –
(a) 23
(b) 100
(c) 161
(d) 145
(a) 10111 (b) 1100100 (c) 10100001 (d) 10010001

Question: Convert 111110111101012 to octal.

Question: Covert the following Octal numbers to Binary –
(a) 456 (b) 26 (c) 751 (d) 777
Answer: (a) 100101110 (b) 010110 (c) 111101001 (d)111111111

Question: Covert the following binary numbers to Hexadecimal –
(a)101000001
(b) 11100011
(c) 10101111
(d) 101101111
Answer: (a) 141 (b) E3 (c) AF (d)16F

Question: Covert the following binary numbers to decimal –
(a)1010
(b) 111000
(c) 10101111
(d) 10110
Answer: (a) 10 (b) 56 (c) 175 (d) 22

(a) 110101 and 101111
(b) 10110 and 1101

Question: Covert the following Hexadecimal numbers to Binary –
(a) BE
(b) BC9
(c) A07
(d) 7AB4
Answer: (a)10111110 (b) 101111001001 (c) 101000000111 (d) 0111101010110100

Question: Convert the following:
(a) 4468 to ( )16
(b) 47.58 to ( )10
(c) 45.910 to ( )2
Answer: (a) 126 (b) 39.625 (c) 101101.1110

Question: How UTF-8 encoding scheme different from UTF-32 encoding scheme?
Answer: UTF-8: Variable-width encoding, backwards compatible with ASCII. ASCII characters (U+0000 to U+007F) take 1 byte, code points U+0080 to U+07FF take 2 bytes, code points U+0800 to U+FFFF take 3 bytes, code points U+10000 to U+10FFFF take 4 bytes. Good for English text, not so good for Asian text.
UTF-32 uses 32-bit values for each character. That allows them to use a fixed-width code for every character. UTF-32 is opposite, it uses the most memory (each character is a fixed 4 bytes wide), but on the other hand, you know that every character has this precise length, so string manipulation becomes far simpler. You can compute the number of characters in a string simply from the length in bytes of the string. You can’t do that with UTF-8.

Question: What are ASCII and extended ASCII schemes?
Answer:The standard ASCII character set uses just 7 bits for each character. There are severallarger character sets that use 8 bits, which gives them 128 additional characters. The extra characters are used to represent non-English characters, graphics symbols, and mathematical symbols.

The extended ASCII character set uses 8 bits, which gives it an additional 128 characters.
The extra characters represent characters from foreign languages and special symbols for drawing pictures.

Question: What is the use of encoding schemes?
Answer: A character encoding provides a key to unlock (ie. crack) the code. It is a set of mappingsbetween the bytes in the computer and the characters in the character set. Without the key, thedata looks like garbage.
So, when you input text using a keyboard or in some other way, the character encoding mapscharacters you choose to specific bytes in computer memory, and then to display the text itreads the bytes back into characters. Unfortunately, there are many different character sets and character encodings, ie. many different ways of mapping between bytes, code points and characters. The section Additional information provides a little more detail for those who are interested.

Question: What is Unicode? What is its significance?
Answer: Unicode is a character encoding standard that has widespread acceptance. Microsoft software uses Unicode at its core. Whether you realize it or not, you are using Unicode already! Basically, ―computers just deal with numbers. They store letters and other characters by assigning a number for each one. Before Unicode was invented, there were hundreds of different encoding systems for assigning these numbers. No single encoding could contain enough characters.1‖ This has been the problem we, in SIL, have often run into. If you are using a legacy encodingyour font conflicts with the font someone in another area of the world uses. You might have an in your font while someplace else someone used a at the same codepoint. Your files are  incompatible. Unicode provides a unique number for every character and so you do not have this problem if you use Unicode. If your document calls for U+0289 it will be clear to any computer program what the character should be

Question: Discuss UTF-8 encoding Scheme.
Answer: UTF-8 is a compromise character encoding that can be as compact as ASCII (if the file is just plain English text) but can also contain any unicode characters (with some increase in file size). UTF stands for Unicode Transformation Format. The ‘8’ means it uses 8-bit blocks to represent a character.

Question: What is the utility of ISCII encoding schemes?
Prepared By: Sanjeev Bhadauria & Neha Tyagi
Answer: ISCII is a bilingual character encoding (not glyphs) scheme. Roman characters and punctuation marks as defined in the standard lower-ASCII take up the first half the character set (first 128 slots). Characters for indie languages are allocated to the upper slots (128-255). T

Question: What are ASCII and ISCII? Why are these used?
Answer: ASCII uses a 7-bit encoding and ISCII uses an 8-bit which is an extension of ASCII. These are encoding schemes to represent character set in s computer system.

Question: What do you understand by code point and code unit?
Answer: A code point is the atomic unit of information. … Each code point is a number which is given meaning by the Unicode standard. A code unit is the unit of storage of a part of anencoded code point. In UTF-8 this means 8-bits, in UTF-16 this means 16-bits.

Question: What is code space? How is it related to code point?
Answer: In computing, Code space may refer to: In memory address space: code space, where machine code is stored. For a character encoding: code space (or code space), the range of code points.

Question: Compare UTF-8 and UTF-32 encoding schemes. Which one is most popular scheme?
Answer: UTF-8: Variable-width encoding, backwards compatible with ASCII. ASCII characters (U+0000 to U+007F) take 1 byte, code points U+0080 to U+07FF take 2 bytes, code points U+0800 to U+FFFF take 3 bytes, code points U+10000 to U+10FFFF take 4 bytes. Good for English text, not so good for Asian text.
UTF-32 uses 32-bit values for each character. That allows them to use a fixed-width code for every character. UTF-32 is opposite, it uses the most memory (each character is a fixed 4 bytes wide), but on the other hand, you know that every character has this precise length, so string manipulation becomes far simpler. You can compute the number of characters in a string simply from the length in bytes of the string. You can’t do that with UTF-8.

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