Computer 9th Chap 3 : Topic 5.4 - Maryam Publications

Computer Chapter 3 : Topic 5.4

Using a debugger and breakpoints

1 / 8

A student is using a JavaScript debugger and places a breakpoint in the middle of a loop to observe how variables change during execution. What is the main purpose of using a breakpoint in this situation?

A) To convert code into optimized HTML

B) To permanently stop the program from running

C) To pause execution and inspect program state at a specific point

D) To delete runtime errors automatically

2 / 8

While debugging a JavaScript program, a student notices that execution stops at a red marker line in the code editor. What does this indicate?

A) Syntax error detected automatically

B) The function has been deleted

C) The browser has crashed

D) A breakpoint has been set at that line

3 / 8

A programmer wants to understand why a variable becomes undefined during execution inside a loop. Which debugging feature is most useful?

A) HTML validator

B) Breakpoint with step-by-step execution

C) Console styling

D) CSS inspection tool

4 / 8

What is the primary advantage of using a debugger instead of inserting multiple console.log() statements in JavaScript?

A) It converts code into machine language

B) It removes the need for variables

C) It automatically fixes logical errors

D) It allows controlled execution and inspection without modifying code

5 / 8

A student sets a breakpoint inside a function that calculates the sum of an array. What can the student observe when execution pauses?

A) CSS styles applied to the page

B) Current variable values and execution flow inside the function

C) Browser memory size only

D) Only final output value

6 / 8

During debugging, a programmer uses step-over and step-into options after hitting a breakpoint. What is the purpose of these options?

A) To delete unused variables

B) To speed up program permanently

C) To control execution line by line for deeper analysis

D) To compile the code into HTML

7 / 8

A student finds that a JavaScript function produces incorrect output only at certain input values. How can breakpoints help identify the issue?

A) By pausing execution to inspect variable values at critical steps

B) By changing all variables to constants

C) By removing all loops

D) By converting code into text format

8 / 8

When using a debugger, why is it useful to pause execution before a conditional statement in JavaScript?

A) To prevent the condition from executing

B) To check variable values that affect the decision outcome

C) To speed up program execution

D) To delete the condition automatically

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