Fundamentals of Data Representation Practice Questions
A-Levels · A-Level Computer Science · 140 free MCQs with instant results and detailed explanations.
140
Total
35
Easy
76
Medium
29
Hard
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Sample Questions from Fundamentals of Data Representation
Here are 10 sample questions. Start a quiz to get randomized questions with scoring.
Q1
Easy
Which of the following is the correct representation of the character 'A' in ASCII?
A.
65
B.
97
C.
74
D.
88
Show Answer & Explanation
Correct Answer: A
In the ASCII character encoding scheme, the character 'A' is represented by the decimal number 65. Each character has a unique decimal value assigned in the ASCII table.
Q2
Easy
If a binary number is 1010, what is its equivalent decimal value?
A.
10
B.
8
C.
12
D.
14
Show Answer & Explanation
Correct Answer: A
The binary number 1010 converts to decimal by calculating 1*2^3 + 0*2^2 + 1*2^1 + 0*2^0, which equals 8 + 0 + 2 + 0 = 10.
Q3
Easy
Which of the following is NOT a standard character encoding scheme?
A.
ASCII
B.
UTF-8
C.
ISO-8859-1
D.
XML
Show Answer & Explanation
Correct Answer: D
XML (eXtensible Markup Language) is not a character encoding scheme; it is a markup language used to define data structure. ASCII, UTF-8, and ISO-8859-1 are standard character encoding schemes.
Q4
Medium
Which of the following best describes ASCII?
A.
A method for compressing data
B.
A character encoding standard
C.
A database management system
D.
An encryption algorithm
Show Answer & Explanation
Correct Answer: B
ASCII stands for American Standard Code for Information Interchange. It is a character encoding standard that uses numeric codes to represent characters, making option B the correct choice.
Q5
Medium
In a computer system, how many bits are in a byte?
A.
4
B.
8
C.
16
D.
32
Show Answer & Explanation
Correct Answer: B
A byte consists of 8 bits. This is a fundamental concept in computer science as bytes are the basic unit of data in a computer.
Q6
Medium
What is the hexadecimal equivalent of the binary number 1010 1111?
A.
AF
B.
BA
C.
9F
D.
CF
Show Answer & Explanation
Correct Answer: A
To convert the binary number 1010 1111 to hexadecimal, group the binary digits into sets of four from the right: 1010 = A and 1111 = F. Therefore, the hexadecimal equivalent is AF.
Q7
Medium
Which of the following data types can represent a real number in most programming languages?
A.
Integer
B.
Boolean
C.
Float
D.
Character
Show Answer & Explanation
Correct Answer: C
In most programming languages, a 'Float' data type is used to represent real numbers, including fractions, while 'Integer' represents whole numbers, making option C the correct answer.
Q8
Hard
In a system using ASCII encoding, which of the following hexadecimal values corresponds to the character 'G'?
A.
47
B.
67
C.
41
D.
4A
Show Answer & Explanation
Correct Answer: A
The ASCII value for the character 'G' is 71 in decimal, which corresponds to 47 in hexadecimal (71 = 47 in base 16).
Q9
Hard
What is the maximum decimal value that can be represented with an 8-bit unsigned binary number?
A.
255
B.
256
C.
128
D.
127
Show Answer & Explanation
Correct Answer: A
An 8-bit unsigned binary number can represent values from 0 to 2^8 - 1. Therefore, the maximum value is 255, which is the decimal equivalent of the binary 11111111.
Q10
Hard
Which of the following hexadecimal values corresponds to the binary number 10101101?
A.
AD
B.
AE
C.
AB
D.
AC
Show Answer & Explanation
Correct Answer: A
The binary number 10101101 converts to hexadecimal by grouping the bits into sets of four (from right): 1010 (A) and 1101 (D). Thus, the hexadecimal representation is AD.
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Fundamentals of Data Representation — A-Levels A-Level Computer Science Practice Questions Online
This page contains 140 practice MCQs for the chapter Fundamentals of Data Representation in A-Levels A-Level Computer Science. The questions are organized by difficulty — 35 easy, 76 medium, 29 hard — so you can choose the right level for your preparation.
Every question includes a detailed explanation to help you understand the concept, not just memorize answers. Take a timed quiz to simulate exam conditions, or practice at your own pace with no time limit.