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MLT · Quiz 2 · 3 Aug 2025 (Afternoon)

15 questions · 40 marks · 60 min

Answer key Take as mock

Indian Institute of Technology Madras

BS Degree Programme · Examination & Study Paper

Machine Learning Techniques

Quiz 2 · 3 Aug 2025 (Afternoon)

Official Paper

Examination Instructions & Guidelines

Solve on notebook/paper first before checking solutions.
MCQ: Exactly 1 option is correct. Negative marking applies.
MSQ: One or more options correct. Select all to score.
NAT: Numerical response. No negative marking.
Scientific calculator allowed for all calculations.
Official answer key is sealed at the end of this sheet.

Q1MCQ4 Marks·Choose one option
Key ↓
1. A
2. B
3. C
4. D
Q2MCQ3 Marks·Choose one option
Key ↓
1. A
2. B
3. C
4. D
Q3MCQ3 Marks·Choose one option
Key ↓
1. ASetting 3, because it has the lowest training error, indicating the best fit to the training data.
2. BSetting 2, because it has the lowest validation error and a relatively low training error, indicating a good generalization.
3. CSetting 1, because it has the highest number of iterations and therefore likely to be more stable.
4. DSetting 4, because it uses the highest learning rate and converges the fastest.
Q4MCQ3 Marks·Choose one option
Key ↓
1. A
2. B
3. C
4. D
Q5MCQ2 Marks·Choose one option
Key ↓
1. ATRUE
2. BFALSE
Q6MCQ1 Mark·Choose one option
Key ↓
1. ATRUE
2. BFALSE
Q7MSQ2 Marks·Choose all correct options
Key ↓
1. A
2. B
3. C
4. D
Q8MSQ2 Marks·Choose all correct options
Key ↓
Which among the following are true?
1. A
2. B
3. C
4. D
5. E
Q9NAT3 Marks·Write the number
Key ↓
Your answer:
Read the passage below, then answer Q10–Q11
Based on the above data, answer the given subquestions.
Q10MCQ3 Marks·Choose one option
Key ↓
Which among the following represents the correct decision boundary for the decision tree? Note: Here + represents the label 1 and − represents the label 0.
1. A
2. B
3. C
4. D
Q11NAT2 Marks·Write the number
Key ↓
What will be the prediction for the new datapoint (2, 2)?
Your answer:
Read the passage below, then answer Q12–Q13
Based on the above data, answer the given subquestions.
Q12NAT2 Marks·Write the number
Key ↓
Your answer:
Q13NAT3 Marks·Write the number
Key ↓
Your answer:
Read the passage below, then answer Q14–Q15
Suppose you want to build a decision tree to help diagnose a certain disease based on patient data. You have a dataset of 1000 patients labeled as either “positive” or “negative”. Here, positive represents patients with the disease and negative represents no disease. One of the feature used to diagnose is headache.
Below is the breakdown of the patients reporting headache:
Headache present: 300 positive, 50 negative
Headache not present: 100 positive, 550 negative
Based on the above data, answer the given subquestions.
Q14NAT3 Marks·Write the number
Key ↓
What is the entropy of the root node? Enter the answer correct to two decimal places.
Your answer:
Q15NAT4 Marks·Write the number
Key ↓
What is the information gain for choosing the feature “headache” for splitting at the root node? Enter the answer correct to two decimal places.
Your answer:

Official Key

Master Answer Key & Explanations

Official answer keys from IIT Madras BS past papers. Click any question to review.

Reveal Key

Q1A

Q2C

Q3B

Q4C

Q5A

Q6A

Q7A, C

Q8A, C

Q94.2

Q10B

Q110

Q120.22 to 0.26

Q131

Q140.95 to 0.99

Q150.34 to 0.38

Questions and answer keys are reproduced from the official IIT Madras BS papers. BTechi is not affiliated with IIT Madras.