Question 1mediummultiple choice
Full question →- A
File size
Why wrong: Not necessarily the file size.
- B
0
Why wrong: The position has advanced.
- C
-1
Why wrong: tell() never returns -1.
- D
10
Correctly reflects the new position.
Question 282 of 511
Quick Answer
The answer is 10. This is correct because the `tell()` method returns the current position of the file pointer as a byte offset from the beginning of the file, and after reading 10 characters from a text file opened in default mode, the pointer advances by exactly 10 bytes—assuming each character is a single byte in a typical ASCII or UTF-8 encoded file. On the Certified Associate Python Programmer PCAP exam, this tests your understanding of file pointer mechanics and the `file tell method byte offset` concept, often appearing in questions that combine `read()`, `seek()`, and `tell()`. A common trap is forgetting that `tell()` counts bytes, not characters, and that multi-byte encodings like UTF-16 would change the offset; however, the exam usually assumes a standard single-byte encoding. Memory tip: think of `tell()` as a tape measure—it always shows how many bytes you’ve moved from the start, so after reading N bytes, `tell()` returns N.
PCAP Exceptions and File I/O Practice Question
This PCAP practice question tests your understanding of exceptions and file i/o. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
A file is opened with open('test.txt', 'r'). The file object's tell() method returns 0. After reading 10 characters, what does tell() return?
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
10
Option D is correct because the `tell()` method returns the current position of the file pointer in bytes from the beginning of the file. After reading 10 characters (each being 1 byte in a typical text file), the pointer advances by 10 bytes, so `tell()` returns 10.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
File size
Why it's wrong here
Not necessarily the file size.
- ✗
0
Why it's wrong here
The position has advanced.
- ✗
-1
Why it's wrong here
tell() never returns -1.
- ✓
10
Why this is correct
Correctly reflects the new position.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Python Institute often tests the misconception that `tell()` returns the number of characters read or the file size, when in fact it returns the byte offset from the start of the file.
Detailed technical explanation
How to think about this question
The `tell()` method internally calls `ftell()` in C, which returns the current position indicator for the stream. In text mode on Windows, line endings (`\r\n`) are translated to `\n`, so reading 10 characters may advance the pointer by more than 10 bytes if the file contains carriage returns. However, in the default 'r' mode on Unix-like systems, no translation occurs, and each character corresponds to one byte.
KKey Concepts to Remember
- Read the scenario before looking for a memorised answer.
- Find the constraint that changes the correct option.
- Eliminate answers that are true in general but not in this case.
TExam Day Tips
- Watch for words such as best, first, most likely and least administrative effort.
- Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A media company stores terabytes of video archives that are accessed once a year for audit purposes. Moving these objects to a cold storage tier (Azure Archive, S3 Glacier, or Google Nearline) costs a fraction of hot storage. Questions like this test whether you understand storage tiers, access frequency tradeoffs, and retrieval latency requirements.
What to study next
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
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Exceptions and File I/O — study guide chapter
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FAQ
Questions learners often ask
What does this PCAP question test?
Exceptions and File I/O — This question tests Exceptions and File I/O — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: 10 — Option D is correct because the `tell()` method returns the current position of the file pointer in bytes from the beginning of the file. After reading 10 characters (each being 1 byte in a typical text file), the pointer advances by 10 bytes, so `tell()` returns 10.
What should I do if I get this PCAP question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
About these practice questions
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
Last reviewed: Jun 30, 2026
This PCAP practice question is part of Courseiva's free Python Institute certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the PCAP exam.
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