Python Institute PCED-30-02 Exam Info and Free Practice Test ExamBoosts [Q19-Q33]

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Q19. You are writing a function to validate battery voltage readings. The rules are:
– If the reading is “MISSING”or None, return “Missing”.
– If the value is below 2.5or above 4.2, return “Outlier”.
Otherwise, return “Normal”.
Which version correctly implements this logic using the most robust conditional and nested structures? Select the best answer.

It first handles the non-numeric cases (“MISSING” and None) in a single condition, preventing invalid comparisons, and then cleanly checks the numeric outlier bounds using an or condition (<
2.5 or > 4.2) before defaulting to “Normal”.

Q20. Which of the following code snippets will output Truefor both printfunctions by correctly identifying the type of each variable and performing valid operations?

Adding an integer and a float produces a float result, so checking that the type of the sum is float evaluates to True. The variable holding 3.0 is a float, so the isinstance check for float also evaluates to True.

Q21. Consider the following Python code:

What will be printed when the code above is executed?
40

[20, 30, 40]
1
[1, 2, 4, 5, 6]
50

[10, 20, 30, 40]
1
[1, 2, 4, 5, 6]
50

[10, 20, 30, 40]
0
[1, 2, 3, 4, 5, 6]
50

[20, 30, 40]
1
[1, 2, 4, 5, 6]

The last element of the original list is 50. The slice from index 1 up to (but not including) index 4 is
[20, 30, 40]. After removing 30 and appending 60, the list contains one occurrence of 10, and integer division by 10 produces [1, 2, 4, 5, 6].

Q22. You are reading a data.csvfile line by line. To prepare each line for formatting with f-strings, you need to remove extra whitespace and split the values by commas.
Which line should you insert to correctly clean and parse the input?

fields = line.strip().split(‘, ‘)

fields = line.split().strip(‘, ‘)

fields = line.replace(‘, ‘, ‘|’).split(‘|’)

fields = line.split(‘, ‘).trim()

Q23. A Python loop uses range(5, 0, -2) to iterate backward. The programmer expects a decreasing sequence. Which values will actually be generated when this loop runs?

5, 3, 1

5, 4, 3, 2, 1

4, 2, 0

5, 3

The range starts at 5 and decreases by 2 each step until it reaches a value greater than 0. The generated sequence is 5, 3, and 1.

Q24. A Python script checks membership using “a” in “apple”. The developer wants to understand how membership works for strings. What result will this expression produce?

False

True

Error

None

The in operator checks for substring presence. Since the character “a” exists in “apple”, the expression evaluates to True, demonstrating how membership works for strings in Python.

Q25. A program uses while False: followed by print statements inside the loop. The developer expects output. What will actually happen during execution?

Infinite loop

Prints once

No execution

Error

The condition False is evaluated before entering the loop. Since it is always false, the loop body is never executed, and no output is produced.

Q26. A data analyst exports a cleaned dataset from Python and wants to share it with a colleague for easy use in Excel.
Which file format is best suited for this purpose? Select the best answer.

CSV, because it stores tabular data in plain text and is compatible with spreadsheet applications.

XML, because it automatically preserves spreadsheet formatting and charts.

JSON, because it stores hierarchical data and is designed for visual presentation in Excel.

SQL, because it directly converts tabular data into database tables that Excel can open.

CSV stores tabular data in a simple plain-text, comma-separated format that is widely supported by spreadsheet applications like Excel, making it ideal for sharing datasets for easy import and analysis.

Q27. A list is defined as [1, 2, 3]. The programmer uses the method .append([4, 5]). What will the resulting list look like after execution?

[1,2,3,4,5]

[1,2,3,[4,5]]

[4,5,1,2,3]

Error

The append() method adds its argument as a single element. Therefore, the list [4, 5] is added as one nested list, resulting in [1, 2, 3, [4, 5]].

Q28. A program uses slicing on a string “Python”. The expression s[1:4] is evaluated. Which substring will be returned?

yth

ytho

tho

ythn

Slicing includes the start index but excludes the end index. Characters at indices 1, 2, and 3 are selected, producing the substring “yth”.

Q29. A health researcher uses wearable devices to record physical activity and sends a survey to randomly selected participants across age groups.
Why can this approach be effective? Select the best answer.

It uses unstructured interviews to validate automated tracking, improving bias detection.

It limits sampling to one demographic, ensuring high-quality data within a specific group.

It relies on observational methods, which are more accurate than surveys or sensors.

It combines automated data collection with representative sampling, reducing the risk of bias.

Combining automated wearable data with a randomly selected survey sample integrates objective measurements with representative participant input, which helps reduce bias and improves the reliability and generalizability of the findings.

Q30. Which of the following statements about Python functions are correct? (Choose two.)

Functions can only return numeric values or strings.

Positional arguments must be passed in the order defined, while keyword arguments can be passed in any order using their parameter names.

A function cannot call itself or be passed as an argument to itself.

passexecutes the function body and returns its result.

If a function does not contain a returnstatement, it returns Noneby default.

Default parameters must always come before required ones in the parameter list.

Positional arguments are matched to parameters by their position, so they must follow the defined order, while keyword arguments are matched by name and can be provided in any order. If a function completes without an explicit return statement, Python returns None automatically.

Q31. A programmer writes a script to test operator precedence using the expression 3 + 4 * 2 ** 2. The goal is to evaluate the result correctly based on Python’s operator hierarchy rules. What result should the script produce?

Exponentiation is evaluated first, so 2 ** 2 equals 4. Then multiplication 4 * 4 equals 16. Finally, addition is performed: 3 + 16 results in 19.

Q32. A program compares two values using == and is. The variables a = 256 and b = 256 are defined.
What is the expected result of a is b in most Python implementations?

True

False

Error

None

Python caches small integers for efficiency. Since 256 is typically within the cached range, both variables reference the same object in memory, making a is b evaluate to True.

Q33. You are developing a temperature control module for a laboratory incubator. Your objectives are to:
– generate timestamps every 10 minutes over a 3-hour span (i.e., 0 to 180 minutes), and
– simulate five evenly spaced target temperatures between 35.0°C and 37.0°C for system calibration.
Which code snippet correctly produces both sequences using NumPy? Select the best answer.
import numpy as np

timestamps = np.linspace(0, 181, 10)
target_temps = np.arange(35.0, 37.0, 0.5)
import numpy a3 np

timestamps = np.linspace(0, 180, 10)
target_temps = np.arange(35.0, 37.0, 5)
import numpy as np

timestamps = np.arange(0, 180, 10)
target_temps = np.linspace(35.0, 37.0, 4)
import numpy as np

timestamps = np.arange(0, 181, 10)
target_temps = np.linspace(35.0, 37.0, 5)

np.arange(0, 181, 10) generates timestamps from 0 through 180 in 10-minute steps (end is excluded, so using 181 includes 180). np.linspace(35.0, 37.0, 5) generates five evenly spaced temperatures including both 35.0°C and 37.0°C.

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