OCR J277 & H446 · GCSE & A Level
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revisecomputing.co.uk/questions/data-representation
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Data Representation
Question
What is the denary value of the binary number 1011?
Model Answer
Correct Answer:
11
To convert binary 1011 to denary: (1 × 2³) + (0 × 2²) + (1 × 2¹) + (1 × 2⁰) = 8 + 0 + 2 + 1 = 11
revisecomputing.co.uk/questions/data-representation
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Data Representation
Question
Explain what binary is and why computers use it.
Keywords to include:
binarybase 20 and 1bitsdigital
Your Answer:
Binary is a number system that uses only 0 and 1. Computers use it because electronic circuits can easily represent two states: on or off.
Model Answer
Model Answer:
Binary is a base-2 number system that uses only two digits: 0 and 1. Each digit is called a bit. Computers use binary because electronic circuits can easily represent two distinct states (on/off, high/low voltage), making it the most reliable way to store and process data in digital systems.
revisecomputing.co.uk/questions/programming
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Programming
Question
Write a Python function that adds two numbers together.
def add_numbers(a, b):
# Your code here
passModel Answer
Model Answer:
def add_numbers(a, b):
return a + bThis function takes two parameters and returns their sum using the addition operator.
revisecomputing.co.uk/questions/networks
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Networks
Question
A router is used to connect devices within a Local Area Network (LAN).
| Question | True | False |
|---|---|---|
| A router is used to connect devices within a Local Area Network (LAN). |
Model Answer
Correct Answer:
False
A router is used to connect different networks together, not devices within a single LAN. A switch or hub is used to connect devices within a LAN.
revisecomputing.co.uk/questions/programming
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Programming
Question
A ______ is a named storage location that holds a value, and a ______ is a sequence of characters.
A variable is a named storage location that holds a value, and a string is a sequence of characters.
function
loop
Model Answer
Correct Answer:
- variable
- string
A variable stores a value, and a string is a sequence of characters. The order doesn't matter in this case.
revisecomputing.co.uk/questions/data-representation
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Data Representation
Question
Match each data type with its description.
| Statement | Integer | Real/Float | String |
|---|---|---|---|
| Whole numbers only | |||
| Numbers with decimal points | |||
| Sequence of characters |
Model Answer
Correct Matches:
| Statement | Correct Match |
|---|---|
| Whole numbers only | Integer |
| Numbers with decimal points | Real/Float |
| Sequence of characters | String |
Integer stores whole numbers (e.g., 5, -10). Real/Float stores decimal numbers (e.g., 3.14, -2.5). String stores text (e.g., 'Hello').
revisecomputing.co.uk/questions/ethics
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Ethics
Question
Discuss the ethical implications of artificial intelligence in education. Consider both benefits and concerns.
Keywords to include:
AIeducationethicsprivacybiasautomation
Word count: 25 / 500 (minimum: 100)
AI in education offers personalized learning and can help teachers identify struggling students. However, there are concerns about data privacy and potential bias in algorithms.
Model Answer
Model Answer:
Artificial intelligence in education presents both significant opportunities and ethical challenges. On the positive side, AI can provide personalized learning experiences, adapt to individual student needs, and help teachers identify areas where students need additional support. It can also automate administrative tasks, freeing up time for educators. However, ethical concerns include data privacy - student information must be protected. There's also the risk of algorithmic bias, where AI systems might perpetuate existing inequalities. Additionally, over-reliance on AI could reduce human interaction in learning, which is crucial for social development. Balancing these benefits and concerns requires careful regulation, transparency in how AI systems work, and ensuring that technology enhances rather than replaces the human element in education.
revisecomputing.co.uk/questions/networks
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Networks
Question
Draw a star network client-server diagram with 3 computers and a printer. Include labels for all components.
Keywords to include:
serverswitchcomputerprintercomputercomputer
Your Drawing Answer:
Model Answer
Model Answer:
A star network diagram should show: A central switch/hub in the middle, with a server connected to it at the top. Three computers connected to the switch (one on the left, one on the right, one below). A printer connected to the switch. All devices should be labeled clearly. The switch acts as the central connection point in a star topology.
Example diagram:
[Star network diagram showing: Server connected to switch, 3 Computers connected to switch, and Printer connected to switch]
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Summer 2026 OCR exam dates
Work back from the real papers—create a free account and line up practice with the timetable you'll sit in the hall.
GCSE Computer Science (J277)
J277/01
Computer systems
1 h 30 min · Wed 13 May · PM
J277/02
Computational thinking, algorithms and programming
1 h 30 min · Tue 19 May · PM
A Level Computer Science (H446)
H446/01
Computer systems
2 h 30 min · Wed 10 Jun · PM
H446/02
Algorithms and programming
2 h 30 min · Wed 17 Jun · AM