Class 9 Maths Chapter 11 MCQs with Answers – The World of Algorithms

Class 9 Maths Chapter 11 MCQs

15 MCQs for Class 9 Maths Chapter 11 – The World of Algorithms

Question 1. What is an algorithm?

A. A random collection of numbers

B. A finite sequence of steps to solve a problem

C. A geometrical shape

D. A type of fraction

Question 2. Which step should generally come first in an algorithm that calculates the sum of two numbers?

A. Display the answer

B. Multiply the numbers

C. Input the two numbers

D. Stop immediately

Question 3. What is the output of the algorithm: Start with 5, add 3, then multiply the result by 2?

A. 13

B. 16

C. 10

D. 11

Question 4. Which symbol is commonly used for a decision in a flowchart?

A. Rectangle

B. Oval

C. Diamond

D. Circle only

Question 5. What is the next number in the pattern 2, 4, 6, 8, …?

A. 9

B. 10

C. 12

D. 14

Question 6. An algorithm starts with x = 7 and subtracts 2. What is the final value of x?

A. 2

B. 4

C. 5

D. 9

Question 7. Which property should a well-designed algorithm generally have?

A. It must continue forever.

B. Its steps should be clear and unambiguous.

C. It must contain random instructions.

D. It must never produce an output.

Question 8. What is the result of following these steps: Set x = 4, set y = 3, calculate x + y?

A. 1

B. 7

C. 12

D. 43

Question 9. Which flowchart symbol is commonly used for input or output?

A. Parallelogram

B. Diamond

C. Oval

D. Triangle

Question 10. An algorithm doubles a number, then adds 1. What is the result when the input is 6?

A. 7

B. 12

C. 13

D. 14

Question 11. What is the next number in the pattern 1, 4, 9, 16, …?

A. 20

B. 24

C. 25

D. 32

Question 12. What is the main purpose of testing an algorithm?

A. To make its instructions longer

B. To check whether it produces the intended results

C. To remove all input values

D. To ensure that it never ends

Question 13. If an instruction says “repeat adding 1 until x = 5,” and x starts at 2, how many additions are needed?

A. 2

B. 3

C. 4

D. 5

Question 14. Which sequence shows the correct order for calculating the average of two numbers?

A. Divide the sum by 2, then add the numbers

B. Add the numbers, then divide their sum by 2

C. Multiply the numbers, then subtract 2

D. Subtract the numbers, then multiply by 2

Question 15. What is a finite algorithm?

A. One that always runs forever

B. One that finishes after a finite number of steps

C. One without instructions

D. One that cannot produce a result

Answer Key – Class 9 Maths Chapter 11 MCQs

Answer Key with Explanations – Chapter 11

1 — B. A finite sequence of steps. An algorithm gives ordered instructions for solving a problem.

2 — C. Input the two numbers. The algorithm needs the values before calculating their sum.

3 — B. 16. First, 5 + 3 = 8; then 8 × 2 = 16.

4 — C. Diamond. A diamond commonly represents a decision or condition in a flowchart.

5 — B. 10. The sequence increases by 2 each time.

6 — C. 5. Subtracting 2 from 7 gives 5.

7 — B. Clear and unambiguous steps. Each instruction should be understandable and precise.

8 — B. 7. The sum is 4 + 3 = 7.

9 — A. Parallelogram. A parallelogram commonly represents input or output.

10 — C. 13. Double 6 to get 12, then add 1 to get 13.

11 — C. 25. These are square numbers: 1², 2², 3², 4², followed by 5² = 25.

12 — B. Check whether it produces the intended results. Testing helps identify errors and verify outputs.

13 — B. 3. The values go from 2 to 3, 4 and 5: three additions.

14 — B. Add the numbers, then divide by 2. Average = (first number + second number) ÷ 2.

15 — B. One that finishes after a finite number of steps. A finite algorithm terminates rather than continuing indefinitely.

NEED MORE PRACTICE?

Improve your problem-solving skills with our Class 9 Maths Chapter 11 Worksheet — 50 MCQs from Science World By Tushar Sir.

• 50 additional multiple-choice questions
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