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Python Institute Certified Associate Data Analyst with Python (PCAD-31-02) Sample Questions:

1. What is a key advantage of using the Parquet file format over CSV in large-scale data pipelines?

A) Parquet supports schema evolution and columnar storage
B) Parquet offers row-based compression
C) Parquet files can only be used with Excel
D) Parquet stores data in plain text, making it human-readable

2. Which of the following is the most suitable data structure in Python for representing a tabular row with column names?

A) tuple
B) dictionary
C) set
D) list

3. Which technique is considered a primary defense against SQL injection when executing database queries from Python?

A) Escaping quotes manually in SQL strings
B) Using parameterized queries
C) Encrypting the database connection
D) Closing the database cursor after each query

4. Which operation would most efficiently apply element-wise multiplication to two NumPy arrays of equal size?

A) array1.dot(array2)
B) array1 * array2
C) numpy.matrix()
D) numpy.outer()

5. Which Python control structures are commonly used for data filtering and iterative operations in real-world analytics tasks?
(Choose two)

A) decorators
B) match-case statements
C) list comprehensions
D) while loops

Solutions: