Page 69 - Computer Science V2.0 Class 11

9. Consider the following statements:
Statement 1: ASCII is a 7-bit code.
Statement 2: We can have 128 unique codes in the ASCII system.
a. Both Statements 1 and 2 are correct
b. Both Statements 1 and 2 are incorrect
c. Statement 1 is correct, but statement 2 is incorrect
d. Statement 1 is incorrect, but statement 2 is correct
10. Which of the following is a fixed length encoding scheme?
a. UTF-8 b. UTF-16 c. UTF-32 d. None of these

B. State whether the following statements are True or False:
1. The binary equivalent of decimal number 7 is 111. __________
2. The number 23 denotes the same value in the hexadecimal and decimal numbers. __________
3. ISCII is an 8-bit code. __________
4. UTF-8 is a fixed-length encoding scheme. __________
5. Unicode covers all the characters for all the writing systems of the world. __________
6. UTF-8 uses minimum of eight bytes to encode characters. __________
C. Fill in the blanks.
1. A __________ system provides a system for expressing the numbers.
2. One octal digit can be used to represent __________ binary digits.
3. ASCII is a __________ bit code.
4. Value of a symbol in decimal number lies between __________ and __________.
5. In the number 208, the most significant digit is __________.
D. Answer the following questions:
1. Name any two number systems that you know.
Ans. Decimal, Binary, Octal, Hexadecimal

2. Why is the decimal Number system known as the base-10 system?
Ans. It uses ten symbols/ digits to represent data.
3. Name any two types of UNICODE encoding schemes.
Ans. UTF-8, UTF-16,UTF-32
4. Give any one point of difference between UTF-8 and UTF-16.
Ans. UTF-8
UTF-8 is an 8-bit encoding scheme.
It is a variable length encoding scheme.
Compatible with ASCII
Widely used for web development
UTF-16
It is a variable length encoding scheme that either uses 2 bytes or 4 bytes to represent the characters.
Not compatible with ASCII
5. Do the following conversions:
a. (456) = ( ? ) 8
10
b. (1101010) = ( ? ) 16
2
c. (71.50) = ( ? ) 10
8
d. (A3.B) = ( ? ) 10
16
e. (71.8) =( ? )
10 16
f. (AF) = ( ? )
16 2
Number Systems and Encoding Schemes 55