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 delete runtime errors automatically

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

D) To permanently stop the program from running

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) A breakpoint has been set at that line

B) The browser has crashed

C) Syntax error detected automatically

D) The function has been deleted

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) CSS inspection tool

D) Console styling

4 / 8

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

A) It automatically fixes logical errors

B) It converts code into machine language

C) It removes the need for variables

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) Current variable values and execution flow inside the function

B) Only final output value

C) Browser memory size only

D) CSS styles applied to the page

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 control execution line by line for deeper analysis

B) To delete unused variables

C) To speed up program permanently

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 changing all variables to constants

B) By removing all loops

C) By converting code into text format

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

8 / 8

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

A) To delete the condition automatically

B) To check variable values that affect the decision outcome

C) To speed up program execution

D) To prevent the condition from executing

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