IGCSE Edexcel Computer Science Marked Exam Paper

Q1. Which data type is used in Python to store a whole number without a decimal point? [1 Mark]

A) float B) str C) int D) bool

Examiner Feedback: Correct answer is C) int. Integer data types represent whole numbers without fractional parts.

Q2. What is the output of the Python expression 14 % 4? [1 Mark]

A) 3 B) 2 C) 3.5 D) 0

Examiner Feedback: Correct answer is B) 2. The % (modulo) operator calculates the remainder of integer division: 14 divided by 4 gives 3 remainder 2.

Q3. What is the result of the Python floor division expression 14 // 4? [1 Mark]

A) 3.5 B) 3 C) 2 D) 4

Examiner Feedback: Correct answer is B) 3. Floor division (//) divides and rounds down to the nearest whole integer.

Q4. Which logical operator in Python evaluates to True if at least one condition is True? [1 Mark]

A) and B) not C) or D) xor

Examiner Feedback: Correct answer is C) or. The or operator requires only one component operand to evaluate to True.

Q5. In a standard flowchart, which symbol represents a decision or conditional branch? [1 Mark]

A) Rectangle B) Oval C) Diamond D) Parallelogram

Examiner Feedback: Correct answer is C) Diamond. Diamonds denote decision points (e.g. IF statements). Rectangles denote processes and parallelograms denote Input/Output.

Q6. What is an essential prerequisite for performing a Binary Search on a list? [1 Mark]

A) The list size must be an even number. B) The list elements must be sorted. C) The list must contain only integers. D) The list must not contain duplicate values.

Examiner Feedback: Correct answer is B) Sorted list. Binary search works by comparing the target with the midpoint, which assumes items are ordered.

Q7. Which statement accurately describes a key operational feature of a Linear Search? [1 Mark]

A) It requires data to be pre-sorted. B) It checks each item sequentially from beginning to end. C) It repeatedly divides the search space in half. D) It only works on numerical data.

Examiner Feedback: Correct answer is B. Linear search sequentially checks every item until a match is found or the end of list is reached.

Q8. Which sorting algorithm compares adjacent pairs of values and swaps them if out of order? [1 Mark]

A) Insertion sort B) Merge sort C) Linear sort D) Bubble sort

Examiner Feedback: Correct answer is D) Bubble sort. Bubble sort repeatedly iterates through a list, swapping adjacent elements when out of order.

Q9. Which Python control structure is designed for count-controlled iteration over a known sequence? [1 Mark]

A) while loop B) for loop C) if...else statement D) try...except block

Examiner Feedback: Correct answer is B) for loop. for loops execute a fixed number of times over a sequence/range.

Q10. What is the result of the expression word[0] if word = "PYTHON"? [1 Mark]

A) "P" B) "Y" C) "N" D) "PYTHON"

Examiner Feedback: Correct answer is A) "P". Python utilizes zero-indexed positioning; index 0 accesses the first character.

Q11. Which built-in Python method adds a new element to the end of a list? [1 Mark]

A) insert() B) append() C) extend() D) add()

Examiner Feedback: Correct answer is B) append(). The .append() method inserts the passed element at the tail of the list.

Q12. Which type of error allows a program to run to completion but produces incorrect outputs? [1 Mark]

A) Syntax error B) Logic error C) Runtime error D) Compilation error

Examiner Feedback: Correct answer is B) Logic error. Syntax errors prevent compilation/execution, while logic errors produce incorrect program behavior.

Q13. Which line of Python code contains a syntax error? [1 Mark]

A) if x == 5: B) if x == 5 C) x = 5 D) print(x)

Examiner Feedback: Correct answer is B. Python conditional headers require a colon (:) at the end of the line.

Q14. Which keyword is used in Python to declare a user-defined function? [1 Mark]

A) func B) define C) def D) function

Examiner Feedback: Correct answer is C) def. The def keyword initiates a function header in Python.

Q15. What keyword is used inside a function to pass a calculated value back to the caller? [1 Mark]

A) send B) output C) return D) yield

Examiner Feedback: Correct answer is C) return. return terminates function execution and hands the result back to the calling scope.

Q16. Which flowchart shape represents inputting data or outputting information? [1 Mark]

A) Rectangle B) Parallelogram C) Oval D) Diamond

Examiner Feedback: Correct answer is B) Parallelogram. Parallelograms denote Input/Output operations in flowchart standard conventions.

Q17. What is the default data type returned by Python's standard input() function? [1 Mark]

A) int B) float C) str D) bool

Examiner Feedback: Correct answer is C) str. input() always returns user input formatted as a string, requiring explicit type casting (e.g. int()) for numerical math.

Q18. What is the primary purpose of constructing a trace table for an algorithm? [1 Mark]

A) To convert code into binary automatically. B) To manually record variable changes line by line during execution. C) To speed up execution time. D) To encrypt data stored in memory.

Examiner Feedback: Correct answer is B. Trace tables track state variations in variables step-by-step through dry runs.

Q19. What happens if the condition of a while loop in Python never becomes False? [1 Mark]

A) The program finishes immediately. B) A syntax error is thrown. C) The loop runs indefinitely in an infinite loop. D) The loop is skipped completely.

Examiner Feedback: Correct answer is C) Infinite loop. Indefinite loops rely on updating boundary variables inside the body; otherwise execution never exits.

Q20. What value is returned by len(["apple", "banana", "cherry"])? [1 Mark]

A) 18 B) 3 C) 2 D) 0

Examiner Feedback: Correct answer is B) 3. The len() function measures total top-level element count in the array/list.

IGCSE Edexcel Computer Science

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