Troubleshoot Common Issues with the Code Life Cycle AT0-001 Practice Questions (Page 1)

Questions 1–5

1. 1foundation · easy

   A JavaScript file contains the line `let x = 5` and the next line `console.log(x);`. The script throws a `SyntaxError: Unexpected identifier`. Which correction resolves this error?

   • AMove `console.log(x);` to the line before the `let` statement.
   • BRemove the parentheses from `console.log`.
   • CChange `let` to `var`.
   • DAdd a semicolon at the end of the `let` statement.
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2. 2application · medium

   A Python script that processes a CSV file fails with the error: 'IndexError: list index out of range' at the line 'print(row[3])'. The script reads the file with 'for row in csv.reader(file):'. The CSV file is well-formed and has headers. What is the most likely cause of this runtime error?

   • AThe csv.reader object does not support indexing.
   • BThe file is not closed after reading, causing a resource leak.
   • CThe CSV file is empty, so the for loop never executes.
   • DOne of the rows in the CSV file has fewer than four columns.
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4. 3application · medium

   A Java application that processes user uploads fails with the error: 'NullPointerException' at the line 'String filename = file.getName();'. The variable 'file' is passed as a parameter. What is the most likely cause and correct fix?

   • AThe 'file' object is not a valid file; check if it exists.
   • BThe 'file' parameter is null; add a null check before accessing its methods.
   • CThe 'getName()' method is deprecated; use 'getPath()' instead.
   • DThe 'file' variable is not initialized; initialize it with 'new File()'.
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5. 4foundation · easy

   A PowerShell script fails with the error: `Unexpected token '}' in expression or statement.` The script contains the following snippet: `if ($a -eq 1) { Write-Output 'One' } else { Write-Output 'Other' }`. Which code structure issue is most likely causing this error?

   • AThe `else` keyword is not on the same line as the closing brace of the `if` block.
   • BThe comparison operator `-eq` should be `==`.
   • CThe `Write-Output` cmdlet requires parentheses around its argument.
   • DThere is an extra closing brace `}` in the script that does not correspond to any opening brace.
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6. 5foundation · easy

   A developer receives the following error when running a Python script: `SyntaxError: invalid syntax` with a caret pointing to the `if` keyword in the line `if x == 5 print(x)`. What is the most likely cause of this syntax error?

   • AThe `if` statement is missing a colon (`:`) at the end of the condition line.
   • BThe variable `x` is not defined before the `if` statement.
   • CThe comparison operator `==` is incorrect; it should be `=`.
   • DThe `print` function is missing a closing parenthesis.
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