Worksheets › Class 9 › Algorithms and Flowcharts
Class 9 · Computational Thinking and AI worksheetAlgorithms and Flowcharts
CBSE Computational Thinking and AI. Flowchart symbols, tracing step-by-step algorithms and loops, finding the bug, ordering steps, swapping values. Every sheet has 20 questions in three sections and an answer key, and the questions change every time.
Sample questions
Real questions from this chapter, as the app sets them. Tap Answer to see the answer and working.
Section A · multiple choice
- 1.
An algorithm is:
- a picture of data
- a list of random guesses
- a kind of computer
- a finite set of clear steps that solves a problem
Answer
(d) a finite set of clear steps that solves a problem
- 2.
What does this algorithm print? 1. Start 2. Read N (N = 13) 3. Set S = 0 and I = 3 4. If I > N, go to step 7 5. Set S = S + I, then I = I + 4 6. Go to step 4 7. Print S 8. Stop
- 21
- 32
- 10
- 91
Answer
(a) 21
3 + 7 + 11
- 3.
How many times is step 5 carried out? 1. Start 2. Read N (N = 13) 3. Set S = 0 and I = 3 4. If I > N, go to step 7 5. Set S = S + I, then I = I + 1 6. Go to step 4 7. Print S 8. Stop
- 10
- 12
- 13
- 11
Answer
(d) 11
I takes the values 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13
Section B · short answer
- 4.
What is the difference between an algorithm and a flowchart?
Answer
An algorithm is the list of steps; a flowchart is a diagram that shows those steps with standard symbols and arrows.
- 5.
What does this algorithm print? 1. Start 2. Read N (N = 66469) 3. Set R = 0 4. If N = 0, go to step 7 5. Set R = R + (last digit of N), then remove the last digit of N 6. Go to step 4 7. Print R 8. Stop
Answer
31
6 + 6 + 4 + 6 + 9
Section C · long answer
- 6.
Write an algorithm and describe its flowchart for finding the sum of the first N natural numbers.
Answer
Start; read N; set S = 0, I = 1; while I ≤ N, set S = S + I and I = I + 1; print S; stop. Flowchart: oval, parallelogram, rectangle, diamond with a loop back, parallelogram, oval.
Fresh sheets for your child
In the app, every Algorithms and Flowcharts sheet is new: the app remembers the questions your child has already had and leaves them out. Print the sheet as a PDF, or use notebook mode and write the answers in a notebook.
Coming soon for Android and iPhone.