Class 9 Computer & AI Chapter 3: Vectors & Words — practice questions with answers
Free practice for Class 9 Computer & AI, Chapter 3: Vectors & Words. Try the solved questions below, then take a free test with instant marking and explanations.
43 questions14 easy, 20 medium, 9 hardNCERT · CBSE · State boards
Sample questions with solutions
Q1. In AI, what is a vector?
- An ordered list of numbers, each number being one dimension
- A straight arrow only
- A type of image file
- A Python error
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Answer: A. An ordered list of numbers, each number being one dimension
Why: Word vectors have 300–1000 numbers. [AI for New Learner — Senior 1, Ch 3]
Why: Word vectors have 300–1000 numbers. [AI for New Learner — Senior 1, Ch 3]
Q2. How do apps like Google Translate and Bhashini ‘understand’ meaning?
- Each word is turned into a vector, and words with similar meanings have similar vectors
- They memorise a dictionary only
- They ask a human every time
- They count letters
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Answer: A. Each word is turned into a vector, and words with similar meanings have similar vectors
Why: Similar meaning → similar vectors. [AI for New Learner — Senior 1, Ch 3]
Why: Similar meaning → similar vectors. [AI for New Learner — Senior 1, Ch 3]
Q3. How is the dot product of two vectors calculated?
- Multiply matching pairs of numbers and add the results
- Add all numbers in both vectors
- Multiply the lengths only
- Subtract one vector from the other
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Answer: A. Multiply matching pairs of numbers and add the results
Why: a · b = a₁b₁ + a₂b₂ + … + aₙbₙ. [AI for New Learner — Senior 1, Ch 3]
Why: a · b = a₁b₁ + a₂b₂ + … + aₙbₙ. [AI for New Learner — Senior 1, Ch 3]
Q4. Compute dot([1, 2, 3], [4, 5, 6]).
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Answer: 32 (± 0)
Why: 4 + 10 + 18 = 32. [AI for New Learner — Senior 1, Ch 3]
Why: 4 + 10 + 18 = 32. [AI for New Learner — Senior 1, Ch 3]
Q5. Compute dot([2, 3], [3, −2]).
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Answer: 0 (± 0)
Why: 6 − 6 = 0, so the vectors are orthogonal. [AI for New Learner — Senior 1, Ch 3]
Why: 6 − 6 = 0, so the vectors are orthogonal. [AI for New Learner — Senior 1, Ch 3]
Q6. What range of values can cosine similarity take?
- From −1 (opposite) to +1 (identical direction)
- From 0 to 100
- Any positive number
- Only 0 or 1
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Answer: A. From −1 (opposite) to +1 (identical direction)
Why: cos_sim = dot ÷ (length × length). [AI for New Learner — Senior 1, Ch 3]
Why: cos_sim = dot ÷ (length × length). [AI for New Learner — Senior 1, Ch 3]
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How many practice questions are there for Class 9 Computer & AI Chapter 3: Vectors & Words?
43 questions (14 easy, 20 medium, 9 hard). A few are solved on this page; the free test shows the answer and explanation for every question after you submit.
Is this chapter from the NCERT book?
Yes — it follows the NCERT Class 9 Computer & AI syllabus, used by CBSE and many state boards.