Lesson 4.5.5.1
4.5.5.1 Character codes, ASCII and Unicode Quiz: AQA Computer Science, Unit 5
20 questions
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Lesson 4.5.5.1, Character codes, ASCII and Unicode: 20 multiple choice questions for the AQA Computer Science (7517), Unit 5: Fundamentals of data representation, written with Revision Ninja.
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The 20 questions
-
What is the ASCII code, in decimal, for the uppercase letter 'A'?
- 66
- 65
- 48
- 97
-
Which character code was introduced to support characters from all of the world's languages?
- Binary coded decimal
- ASCII
- Unicode
- Gray code
-
How many bits are used to represent a character in standard ASCII?
- 32 bits
- 7 bits
- 8 bits
- 16 bits
-
How many unique characters can be represented using standard 7-bit ASCII?
- 64
- 256
- 1024
- 128
-
How is the character form of a decimal digit stored differently from pure binary?
- Character code value
- Pure binary value
- Two's complement
- Floating-point exponent
-
What is the ASCII code, in decimal, of the character '0'?
- 32
- 48
- 1
- 0
-
Which decimal value is the ASCII code for the lowercase letter 'a'?
- 98
- 122
- 65
- 97
-
The character '7' has ASCII code 55. What is 55 in 7-bit binary?
- 0110111
- 0111000
- 0000111
- 0110110
-
How many bytes does the ASCII text 'Quiz' need, using one byte per character?
- 3 bytes
- 16 bytes
- 8 bytes
- 4 bytes
-
A file stores 1000 characters, each using 16 bits. How many bytes does the file need?
- 8000 bytes
- 4000 bytes
- 2000 bytes
- 1000 bytes
-
The ASCII code for 'A' is 65. What is the ASCII code for 'C'?
- 68
- 66
- 67
- 70
-
What is the pure binary representation of the decimal integer 9 using 4 bits?
- 0101
- 0011
- 1001
- 0111
-
A text uses 200 ASCII characters, each stored in 7 bits. How many bits are needed?
- 200
- 800
- 1600
- 1400
-
A string of 10 characters is stored with 8 bits per character. How many bits does it need?
- 100
- 80
- 70
- 10
-
How many distinct characters can an 8-bit code represent?
- 256
- 128
- 255
- 64
-
Why was Unicode introduced to replace standard ASCII in modern computer systems?
- To speed up processors
- To encrypt passwords safely
- To compress text files
- To support all alphabets
-
A text file has 500 characters. 480 are ASCII characters stored in 1 byte each and 20 are stored in 2 bytes each. What is the total size?
- 540 bytes
- 1000 bytes
- 500 bytes
- 520 bytes
-
Which pair of ASCII codes differ by exactly 32 for an uppercase and lowercase letter?
- 'a' (97) and 'z' (122)
- 'A' (65) and 'B' (66)
- 'A' (65) and 'a' (97)
- '0' (48) and 'A' (65)
-
The ASCII code of the character '4' is 52. What value results from subtracting 48?
- 3
- 4
- 48
- 52
-
What is the numerical difference in ASCII code between uppercase and lowercase English letters?
- 16
- 32
- 64
- 26
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