1. Which keyword is used to use a library in a Python program?
- include
- using
- require
- import
Answer: D) import
Explanation: e.g. import math, import turtle, import matplotlib.pyplot as plt. SLO CS-11-C-04 · Knowledge
MCQs / Computer Science / Unit 3: Programming Fundamentals
Unit 3: Programming Fundamentals MCQs — Computer Science
116 multiple-choice questions on Unit 3: Programming Fundamentals from Computer Science, each with the correct answer and, where available, a teacher's explanation. Read through them to revise the chapter, then practise the same questions one by one to test yourself.
2. What is the output? python for x in ['Computer', 'English', 'Physics', 'Maths']: if x == 'Physics': break print(x, end=' ')
- Computer English
- Physics Maths
- Computer English Physics
- Computer English Maths
Answer: A) Computer English
Explanation: break exits the loop as soon as x is 'Physics', before printing it. SLO CS-11-C-02 · Application
3. screen.onclick(draw) in a Turtle program is an example of:
- Encryption
- Exception handling
- Recursion
- Event handling
Answer: D) Event handling
Explanation: The function draw runs when the event (a mouse click) happens. SLO CS-11-C-03 · Understanding
4. Why is code written inside functions easier to test?
- Functions never contain errors
- Each function can be called with test inputs and its return value checked
- Code outside functions cannot run
- Functions are compiled separately
Answer: B) Each function can be called with test inputs and its return value checked
Explanation: Unit tests call a function and compare the result with the expected value. SLO CS-11-C-07 · Understanding
5. What is the output? python nums = [4, 8, 15, 16] print(nums[-1])
- 15
- 16
- 4
- Error
Answer: B) 16
Explanation: Negative indexes count from the end; -1 is the last item. SLO CS-11-C-05 · Application
6. Which screen method changes the background colour of the Turtle window?
- turtle.fill('yellow')
- screen.color('yellow')
- screen.bgcolor('yellow')
- screen.paint('yellow')
Answer: C) screen.bgcolor('yellow')
Explanation: Screen methods control the window; turtle methods control the pen. SLO CS-11-C-03 · Knowledge
7. What is the output? python x = 20.5 print(type(x))
- <class 'int'
- <class 'float'
- <class 'str'
- <class 'double'
Answer: B) <class 'float'
Explanation: 20.5 has a decimal point, so it is a float. SLO CS-11-C-02 · Application
8. A function without a return statement returns:
- None
- An error
- 0
- An empty string
Answer: A) None
Explanation: Python functions return None by default. SLO CS-11-C-06 · Understanding
9. What is printed? python def findmax(a, b): if a b: return a return b print(findmax(4, 9) + findmax(7, 2))
- 11
- 16
- 13
- 9
Answer: B) 16
Explanation: findmax(4, 9) = 9 and findmax(7, 2) = 7; 9 + 7 = 16. SLO CS-11-C-06 · Application
10. What is the output? python import math print(math.sqrt(49))
- 7
- 7.0
- Error
- 49
Answer: B) 7.0
Explanation: math.sqrt returns a float. SLO CS-11-C-04 · Application
11. Which loop draws a regular hexagon with Turtle (t)?
- for i in range(6): t.forward(80); t.left(30)
- for i in range(4): t.forward(80); t.left(90)
- for i in range(6): t.forward(80); t.left(120)
- for i in range(6): t.forward(80); t.left(60)
Answer: D) for i in range(6): t.forward(80); t.left(60)
Explanation: The turtle turns by the exterior angle 360° div 6 = 60° at each corner. SLO CS-11-C-03 · Application
12. A program runs without crashing but gives the wrong answer. This is a:
- Compiler error
- Syntax error
- Run-time error
- Logical error
Answer: D) Logical error
Explanation: Logic errors are found by testing and dry runs, not by the interpreter. SLO CS-11-C-07 · Understanding
13. What does this program print? python squares = [] for i in range(1, 5): squares.append(i i) print(squares)
- [1, 4, 9, 16]
- [0, 1, 4, 9]
- [1, 4, 9, 16, 25]
- [2, 4, 6, 8]
Answer: A) [1, 4, 9, 16]
Explanation: range(1, 5) gives 1–4; each square is appended. SLO CS-11-C-05 · Application
14. What is the output? python x = 5 def change(): x = 10 print(x, end=' ') change() print(x)
- 10 5
- 10 10
- 5 10
- 5 5
Answer: A) 10 5
Explanation: Inside the function, x is a new local variable; the global x stays 5. SLO CS-11-C-06 · Application
15. What is the output? python for n in range(1, 6): if n % 2 == 0: continue print(n, end=' ')
- 1 2 3 4 5
- 2 4
- 1 3 5
- 1
Answer: C) 1 3 5
Explanation: continue skips the rest of the loop body for even numbers. SLO CS-11-C-02 · Application
16. Which of these is an IDE that can be used to write and run Python programs?
- Windows Explorer
- VS Code
- Microsoft Paint
- Google Maps
Answer: B) VS Code
Explanation: VS Code (offline) and replit.com (online) are IDEs named in the curriculum. SLO CS-11-C-02 · Knowledge
17. Why do we move repeated code into a function?
- To make the program run slower
- To hide errors
- Because Python requires every line inside a function
- To avoid duplication and make the code easier to test and reuse
Answer: D) To avoid duplication and make the code easier to test and reuse
Explanation: Functions support decomposition and reuse. SLO CS-11-C-06 · Understanding
18. Which values can random.randint(1, 6) return?
- Any whole number from 1 to 6, including both
- Only 1 or 6
- Any decimal between 1 and 6
- 1 to 5 only
Answer: A) Any whole number from 1 to 6, including both
Explanation: Unlike range, randint(a, b) includes both ends — like a dice. SLO CS-11-C-04 · Knowledge
19. Which error occurs when you run print(10 / 0)?
- SyntaxError
- NameError
- IndexError
- ZeroDivisionError
Answer: D) ZeroDivisionError
Explanation: Division by zero is a run-time error. SLO CS-11-C-07 · Knowledge
20. What does this code print? python for i in range(1, 10, 3): print(i, end=' ')
- 1 2 3
- 1 4 7 10
- 3 6 9
- 1 4 7
Answer: D) 1 4 7
Explanation: range(1, 10, 3) starts at 1, steps by 3 and stops before 10. SLO CS-11-C-02 · Application
21. Which Turtle method moves the turtle without drawing a line?
- penup() then forward()
- pendown() then forward()
- color()
- circle()
Answer: A) penup() then forward()
Explanation: Lift the pen with penup(), move, then pendown() to draw again — useful for compound shapes. SLO CS-11-C-03 · Knowledge
22. Every program follows which basic cycle?
- Compile → Delete → Save
- Process → Output → Input
- Output → Input → Process
- Input → Process → Output
Answer: D) Input → Process → Output
Explanation: Programs use the computer's components to take input, process it and produce output. SLO CS-11-C-01 · Knowledge
23. Which symbol starts a single-line comment in Python?
- //
- /
Answer: B)
Explanation: Python ignores everything after on a line. SLO CS-11-C-02 · Knowledge
24. What does t.left(90) do?
- Draws a 90° arc
- Turns the turtle 90° clockwise
- Moves the turtle 90 pixels left
- Turns the turtle 90° anticlockwise
Answer: D) Turns the turtle 90° anticlockwise
Explanation: left() and right() rotate the turtle; forward()/backward() move it. SLO CS-11-C-03 · Understanding
25. What happens? python cities = ['Islamabad', 'Karachi', 'Lahore'] print(cities[3])
- Islamabad
- IndexError
- Lahore
- None
Answer: B) IndexError
Explanation: Indexes are 0, 1, 2 — index 3 is out of range. cities[-1] or cities[2] gives Lahore. SLO CS-11-C-05 · Application
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Practise Unit 3: Programming Fundamentals MCQs
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