Data Science & Analytics
JKSSB Sub-Inspector (Telecommunication) · Artificial Intelligence, Data Science & Automation · 18 practice questions with answers and explanations: 11 Easy, 7 Medium, 0 Hard.
Sample questions
Sample Easy question 1
Which Python library is mainly used for data frames and data analysis?
- Tkinter
- pandas
- Pygame
- Matplotlib alone
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Answer: B. pandas provides the DataFrame, a table of labelled data.
Sample Easy question 2
Which Python library provides fast numerical arrays?
- Django
- NumPy
- Requests
- Flask
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Answer: B. NumPy's ndarray supports efficient numerical computing.
Sample Easy question 3
Which Python library is mainly used for plotting charts?
- scikit-learn
- pandas
- BeautifulSoup
- Matplotlib
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Answer: D. Matplotlib draws line, bar and scatter plots.
Sample Medium question 4
What is the range of the Pearson correlation coefficient?
- 0 to 1
- 0 to infinity
- −1 to +1
- −100 to +100
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Answer: C. +1 is perfect positive, −1 perfect negative and 0 no linear relationship.
Sample Medium question 5
What is the formula for min-max normalisation of a value x?
- x/mean
- (x − mean)/standard deviation
- max − x
- (x − min)/(max − min)
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Answer: D. It rescales values into the range 0 to 1.
Sample Medium question 6
What does ETL stand for in data warehousing?
- Evaluate, Train, Learn
- Extract, Transform, Load
- Enter, Test, Launch
- Encode, Transmit, Log
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Answer: B. Data is extracted from sources, cleaned and transformed, then loaded into the warehouse.