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J277/02 · 30 questions · auto-marked

Paper 2 mock

Multiple-choice mock of computational thinking, algorithms and programming. Submit for a score. Optional 35-minute timer. Nothing locked behind the mark.

J277/02 style, multiple choice only. 30 questions, 1 mark each.

Tick the timer if you want 35 minutes and an auto-submit. Leave it off to sit untimed.

Unanswered questions score 0. After submit you get a mark, an unofficial grade-region, and links to the units you missed.

This is not a real OCR paper (no long Section B writing). It still checks whether the ideas are in your head.

30 questions

Use a 35-minute timer (auto-submits when it hits zero)

1 2.1.1 Abstraction is…

Breaking a problem into sub-problems Removing unnecessary detail to focus on what matters Always writing Python A type of malware

2 2.1.1 Splitting “make a shop website” into catalogue, basket, and checkout is…

Abstraction Decomposition Lossy compression A star topology

3 2.1.2 In a flowchart, a diamond represents…

Start or stop A decision A file on disk Input only

4 2.1.2 A program runs but prints the wrong total. This is best described as a…

Syntax error Logic error Topology error Successful compile with no issues

5 2.1.3 Binary search requires the data to be…

Unsorted Sorted Compressed with JPEG Stored in ROM

6 2.1.3 Linear search can be used on an unsorted list.

True False

7 2.1.3 After the first full pass of an ascending bubble sort, which is true?

The whole list is always fully sorted The largest item is in its final position No further passes are ever needed The list is converted to hex

8 2.1.3 Merge sort is best described as…

Comparing only neighbours until no swaps remain Divide and conquer — split, then merge sorted halves Inserting each item into a sorted left-hand side only A search that needs unsorted data

9 2.2.1 A count-controlled loop is used when…

You already know how many times to repeat You must encrypt a disk The program has no variables SQL is required

10 2.2.1 Nesting means…

Putting one construct inside another, such as an if inside a for Compressing a file Using only global variables A type of topology

11 2.2.2 Which data type is appropriate for “has the user paid?”

Integer only Boolean Character only Real, always

12 2.2.2 In Python, the expression "3" + "4" evaluates to…

The integer 7 The string "34" The integer 34 An automatic AND gate

13 2.2.3 A function differs from a procedure because a function…

Cannot take parameters Returns a value Cannot be named Is always written in SQL

14 2.2.3 Opening a file in write mode ("w") typically…

Appends without touching existing content Creates or overwrites the file Encrypts the disk Runs a binary search

15 2.2.3 The SQL SELECT name FROM pupils WHERE year = 8 returns…

Every column of every pupil The name field of pupils in year 8 A sorted binary tree Nothing, because SQL cannot filter

16 2.2.1 In Python, range(1, 6) produces which integers?

1,2,3,4,5,6 1,2,3,4,5 0,1,2,3,4,5 6 only

17 2.3.1 Checking that an input is not blank is a…

Range check Presence check Syntax error Merge sort

18 2.3.1 Validation differs from verification because validation…

Proves the data is the true real-world value Checks the data is reasonable or in the right form Is only used in SQL Replaces testing

19 2.3.2 Test data on the allowed minimum and maximum is called…

Invalid Boundary Syntax Cloud

20 2.3.2 Iterative testing happens…

Only after the entire system is finished During development, as each part is built Only in the ALU Instead of writing code

21 2.4.1 The output of AND is 1 only when…

At least one input is 1 Both inputs are 1 Both inputs are 0 The CPU is overclocked

22 2.4.1 How many rows does a truth table with 3 inputs need?

3 6 8 9

23 2.4.1 1 OR 1 equals…

0 1 Undefined at GCSE Only used in hex

24 2.4.1 NOT 0 equals…

0 1 2 A AND 0

25 2.5.1 Machine code is…

A high-level language like Python Binary instructions the CPU can execute A type of topology Lossy compression

26 2.5.1 An interpreter…

Always produces an executable you can run without it Translates and runs the program statement by statement Is a kind of SSD Assigns MAC addresses

27 2.5.1 Once a program is compiled, you typically still need the compiler on the user’s PC to run it.

True False

28 2.5.2 Syntax highlighting is a feature of the IDE’s…

Router Editor HDD defragmenter DNS

29 erl In OCR Exam Reference Language, remainder after division is written…

Always as a percent sign with no other word MOD AND DIV

30 trace In a while-loop trace table you should also record…

Only the first value of each variable The condition becoming false that stops the loop The MAC address of the PC Nothing after the first iteration