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Data Representation Practice Questions

GCSE · GCSE Computer Science · 148 free MCQs with instant results and detailed explanations.

148
Total
39
Easy
83
Medium
26
Hard

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Sample Questions from Data Representation

Here are 10 sample questions. Start a quiz to get randomized questions with scoring.

Q1
Easy
What is the binary representation of the decimal number 10?
A. 1010
B. 1001
C. 1100
D. 1110
Show Answer & Explanation
Correct Answer: A
The binary representation of the decimal number 10 is 1010, where 1s and 0s represent powers of 2.
Q2
Easy
Which of the following is a characteristic of hexadecimal representation?
A. Uses 10 symbols from 0 to 9 only
B. Uses 16 symbols including 0-9 and A-F
C. Is base 8 and uses digits 0-7
D. Is equivalent to binary in every aspect
Show Answer & Explanation
Correct Answer: B
Hexadecimal representation uses 16 symbols, which include the digits 0-9 and the letters A-F to represent values 10-15.
Q3
Easy
If a character is represented using ASCII, how many bits are used?
A. 4 bits
B. 8 bits
C. 16 bits
D. 32 bits
Show Answer & Explanation
Correct Answer: B
ASCII uses 8 bits to represent each character, allowing for 256 different characters.
Q4
Medium
What is the binary representation of the decimal number 13?
A. 1101
B. 1011
C. 1110
D. 1001
Show Answer & Explanation
Correct Answer: A
The binary representation of 13 is 1101, which can be derived from the powers of 2: 8 (2^3) + 4 (2^2) + 1 (2^0).
Q5
Medium
Which of the following data types is best used for storing a single character in programming?
A. Integer
B. String
C. Character
D. Boolean
Show Answer & Explanation
Correct Answer: C
The Character data type is specifically designed to store a single character, unlike Integer, String, or Boolean which serve different purposes.
Q6
Medium
Which coding system uses 7 bits to represent a character and is widely used in computers?
A. ASCII
B. Unicode
C. UTF-8
D. EBCDIC
Show Answer & Explanation
Correct Answer: A
ASCII (American Standard Code for Information Interchange) uses 7 bits to represent characters and is one of the earliest character encoding systems used in computing.
Q7
Medium
What is the maximum decimal value that can be represented by an 8-bit unsigned binary number?
A. 255
B. 128
C. 256
D. 512
Show Answer & Explanation
Correct Answer: A
An 8-bit unsigned binary number can represent values from 0 to 255. The maximum value is calculated as 2^8 - 1, which equals 255.
Q8
Hard
What is the binary equivalent of the decimal number 45?
A. 101101
B. 110100
C. 100011
D. 111000
Show Answer & Explanation
Correct Answer: A
The binary representation of 45 is 101101. By converting 45 to binary, we repeatedly divide by 2 and track the remainders.
Q9
Hard
Which of the following number systems uses a base of 16?
A. Octal
B. Decimal
C. Binary
D. Hexadecimal
Show Answer & Explanation
Correct Answer: D
Hexadecimal is the number system that uses a base of 16. It includes digits from 0 to 9 and letters A to F to represent values.
Q10
Hard
What is the binary representation of the decimal number 45?
A. 101101
B. 110111
C. 111001
D. 100101
Show Answer & Explanation
Correct Answer: A
The decimal number 45 converts to binary as 101101. This is calculated by dividing 45 by 2 repeatedly and noting the remainders.

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Data Representation — GCSE GCSE Computer Science Practice Questions Online

This page contains 148 practice MCQs for the chapter Data Representation in GCSE GCSE Computer Science. The questions are organized by difficulty — 39 easy, 83 medium, 26 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.