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MLP · Text, image & time-series data

8 questions · 20 marks · 2 papers

Answer key

Indian Institute of Technology Madras

BS Degree Programme · Examination & Study Paper

Machine Learning Practice

Text, image & time-series data

Official Paper

Examination Instructions & Guidelines

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

End Term · 31 Aug 2025 (FN)End Term

Q1MCQ2 Marks·Choose one option
Key ↓
What is the primary function of the pandas.resample() method for a time series?
1. ATo convert a DataFrame to a series or vice versa.
2. BTo fill in missing values in the time series using various interpolation methods.
3. CTo change the frequency of the time series, such as converting daily data to monthly or monthly data to daily.
4. DTo perform statistical tests to check for stationarity in the time series.
Q2MCQ3 Marks·Choose one option
Key ↓
1. A(i) – resize, (ii) – augment, (iii) – flatten, (iv) – grayscale
2. B(i) – grayscale, (ii) – flatten, (iii) – resize, (iv) – augment
3. C(i) – grayscale, (ii) – augment, (iii) – resize, (iv) – flatten
4. D(i) – grayscale, (ii) – resize, (iii) – flatten, (iv) – augment
Q3MCQ3 Marks·Choose one option
Key ↓
A time series with a clear upward trend and increasing variance over time is identified as non- stationary. Which two preprocessing steps are most likely required?
1. AMin-Max scaling and seasonal decomposition
2. BImputing missing values and differencing
3. CLog transformation and differencing
4. DStandardization and moving average smoothing
Q4NAT2 Marks·Write the number
Asked 2 times Key ↓
Your answer:

End Term · 31 Aug 2025 (AN)End Term

Q5MCQ2 Marks·Choose one option
Key ↓
1. A(200, 200, 3)
2. B(40000, )
3. C(200, 200, 1)
4. D(40000, 3)
Q6MCQ2 Marks·Choose one option
Key ↓
Which of the following statements about the Augmented Dickey-Fuller (ADF) test is correct?
1. AThe test is used to detect seasonality in a time series
2. BA low p-value (e.g., < 0.05) indicates the time series is non-stationary
3. CThe test’s null hypothesis is that the time series is stationary
4. DA low p-value (e.g., < 0.05) indicates the time series is stationary
Q7MCQ3 Marks·Choose one option
Key ↓
Which of the following best describes the components of a time series in a classical multiplicative decomposition model?
1. AThe series is a product of a trend component and an error component only
2. BThe series is a sum of a trend component, a seasonal component, and a cyclical component
3. CThe series is a product of a trend component, a seasonal component, and an error component
4. DThe series is a sum of a trend component, a seasonal component, and a error component
Q8NAT3 Marks·Write the number
Asked 2 times Key ↓
Your answer:

Official Key

Master Answer Key & Explanations

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

Reveal Key

Q1C

Q2D

Q3C

Q411

Q5B

Q6D

Q7C

Q810

Questions and answer keys are reproduced from the official IIT Madras BS papers. Topics and repeated question types are BTechi’s own grouping. BTechi is not affiliated with IIT Madras.