LWC Quickfire Quiz: Are You Lightning Fast?

Welcome to your LWC Quickfire Quiz: Are You Lightning Fast?

Name

Email

1.

What is the main purpose of a Lightning Web Component in Salesforce?

To build server-side Apex classes

To create dynamic, reusable components using modern JavaScript

To manage user permissions

To store records in custom objects

2.

Which programming language is primarily used in Lightning Web Components?

Java

Apex

JavaScript

Python

3.

What is the default file extension for a Lightning Web Component HTML template?

.lwc

.html

.cmp

.js

4.

Which decorator is used in LWC to expose a property to the parent component?

@wire

@track

@api

@auraEnabled

5.

What is the purpose of the @wire decorator in LWC?

To create event listeners

To track variable changes

To connect to Salesforce data using Apex or LDS

To apply custom CSS styling

6.

How do you trigger a custom event in LWC?

fireEvent('eventName')

trigger('eventName')

this.dispatchEvent(new CustomEvent('eventName'))

new Event('eventName')

7.

Which folder in the Salesforce DX structure holds LWC files?

force-app/main/default/lwc/

lwc/components/

metadata/lwc/

src/lwc_files/

8.

What lifecycle hook is called when a component is inserted into the DOM?

connectedCallback()

renderedCallback()

init()

onMount()

9.

Can Lightning Web Components be used inside Aura Components?

No, they are not compatible

Yes, but only with wrapper classes

Yes, LWC can be embedded inside Aura

Only in Classic UI

10.

Which of the following cannot be used directly inside an LWC component?

Standard Lightning Base Components (like lightning-input)

@auraEnabled Apex methods

Visualforce pages

JavaScript ES6 features

11.

What is the function of the @track decorator in LWC?

To expose data to the parent

To track internal changes to a property

To create a wire adapter

To define a lifecycle hook

12.

Which file defines the metadata for an LWC component?

component.html

component-meta.xml

component.json

component.config.xml

13.

How can you conditionally render HTML in LWC?

Using aura:if

Using JavaScript only

Using template if:true or if:false directives

Using Visualforce IF tag

14.

Which directive is used for list rendering in LWC?

for:each

each:item

template for:each and for:item

v-for

15.

What command is used to create a new LWC component using Salesforce CLI?

sfdx force:create:lwc

sfdx create component

sfdx force:lightning:component:create

sfdx force:lightning:component:create --type lwc

16.

Which method is used to navigate to a record page in LWC?

navigateToRecord

NavigationMixin.Navigate

goToRecord()

recordView()

17.

What is the role of Lightning Data Service (LDS) in LWC?

To write JavaScript logic

To provide automatic data access and record handling

To create Aura components

To deploy metadata

18.

What happens if you modify a tracked property directly in LWC?

Component won't re-render

Throws a runtime error

Triggers reactivity and re-renders the component

Only affects parent component

19.

What is the purpose of `renderedCallback()` lifecycle hook?

Fires before component is rendered

Fires after every render cycle

Used to clean up memory

Used to fetch Apex data

20.

What tool can you use to inspect and debug LWC components in browser?

Apex Logs

Salesforce Inspector

Chrome DevTools + LWC Developer Tools Extension

Workbench

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