100% Free Python Institute PCED Practice Test Questions and Answers 2026

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Total 382 Questions | Updated On: May 22, 2026

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Question 1

You have a DataFrame named df that has three columns: 'A', 'B', 'C'. The DataFrame has 100 rows. Your task is to create a DataFrame where each column 'A', 'B', 'C' is transformed into 3 columns each: 'A_min', 'A_max', 'A_mean', 'B_min', 'B_max', 'B_mean', 'C_min', 'C_max', 'C_mean'. Which of the following code snippets accomplishes this task?

A : new_df = df.groupby(['A', 'B', 'C']).agg(['min', 'max', 'mean'])

B : new_df = df.apply(['min', 'max', 'mean'])

C : new_df = df.pivot(columns=['A', 'B', 'C'], values=['min', 'max', 'mean'])

D : new_df = df.aggregate( { 'A': ['min', 'max', 'mean'], 'B': ['min', 'max', 'mean'], 'C': ['min', 'max', 'mean'], })

Answer: D

Question 2

You are analyzing the relationship between hours of study and exam scores among students. After calculating, you find a correlation coefficient (r) of 0.9. Which of the following is the best interpretation?

A : Hours of study has a strong, positive correlation with exam scores

B : Hours of study has a moderate, negative effect on exam scores

C : Exam scores have no relationship with hours of study

D : Hours of study causes high exam scores

Answer: A

Question 3

You have a Pandas DataFrame that contains missing values. Which of the following methods will replace all NaNs with zeros?

A : df.fillna(value=0)

B : df.replace(to_replace=np.nan, value=0)

C : df['column_name'] = 0

D : df.dropna(subset=['column_name'])

Answer: A

Question 4

What is the primary reason to use PCA (Principal Component Analysis) over t-SNE when visualizing high-dimensional data?

A : PCA is non-linear while t-SNE is linear

B : PCA is more computationally efficient for large datasets

C : PCA retains local structure while t-SNE focuses on global structure

D : PCA gives a more accurate representation of distances between clusters

Answer: B

Question 5

Which of the following libraries in Python is not commonly used for web scraping to collect data?

A : Scrapy

B : Selenium

C : Pandas

D : BeautifulSoup

Answer: C

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Total 382 Questions | Updated On: May 22, 2026

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