Page 67 - ComputerScience_Class_11

1. Assertion (A): BCD encoding is efficient for storing large numbers.
Reason (R): BCD uses 4 bits to represent each decimal digit, which makes it efficient for all types of numeric operations.
Ans. d. A is false but R is true.
2. Assertion (A): ASCII is a character encoding system widely used in computers and on the web.
Reason (R): ASCII represents only English alphabets, digits and a limited set of special characters using 7 bits.
Ans. a. Both A and R are true and R is the correct explanation of A.
3. Assertion (A): ASCII 8-bit encoding allows for representation of characters beyond English.
Reason (R): The 8-bit version of ASCII includes characters used in other European languages, like Latin characters, but does not
support Indian languages.
Ans. b. Both A and R are true but R is not the correct explanation of A.

F. Case study-based questions.
Unicode is an international encoding standard that was developed to replace older systems like ASCII and ISCII. By supporting 159
scripts, Unicode can represent characters from virtually every language, making it the standard for text processing across the world.
Today, Unicode is used by the majority of digital systems and platforms, allowing for seamless communication and data exchange
across diverse languages and regions.
Based on the given case, answer the following questions:
1. What does Unicode primarily allow computers to do?
a. Represent only English characters b. Store only special symbols
c. Process only numeric data d. Represent all characters from all global languages
2. Which of the following is a benefit of Unicode?
a. It supports only 128 characters b. It is backwards compatible with ASCII
c. It is used exclusively for English text d. It uses fewer bytes than BCD
3. Which encoding scheme in Unicode uses a variable number of bytes for different characters?
a. UTF-8 b. UTF-16
c. UTF-32 d. ASCII
4. Which of the following is true about Unicode?
a. It is a fixed-width encoding scheme b. It supports over 144,000 characters from global scripts
c. It only supports characters from European languages d. It uses less memory than ASCII

Answers
1. d 2. b 3. a 4. b

Unsolved Questions

A. Tick ( ) the correct option.
1. 4 bits make a ………………… .
a. kilobyte b. megabyte
c. byte d. nibble
2. Which of the following is a 4-bit encoding scheme?
a. ASCII b. ISCII
c. BCD d. Unicode
3. ASCII-7 can represent ………………… characters.
a. 256 b. 1024
c. 65536 d. 128
4. Which of the following is the most popular Unicode encoding scheme?
a. UTF-16 b. UTF-8
c. UTF-32 d. UTF-64
5. How many bits are used in standard ASCII?
a. 6 b. 7
c. 8 d. 16

Encodings 65