Bootstrap Quiz Test Online (30 random Questions) 2026

Test your Bootstrap knowledge with this 30-minute quiz! Covering fundamental to advanced concepts, this quiz features 30 multiple-choice questions that will challenge your understanding of the Bootstrap framework, including grid systems, components, utilities, and responsive design. Perfect for interview preparation and skill enhancement.

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30 Minutes Bootstrap Quiz Test Online

Test your Bootstrap knowledge with this 30-minute quiz! Covering fundamental to advanced concepts, this quiz features 30 multiple-choice questions that will challenge your understanding of the Bootstrap framework, including grid systems, components, utilities, and responsive design. Perfect for interview preparation and skill enhancement.

1 / 30

1. Which Bootstrap 5 utility or class is typically used to create a form with a horizontal layout?

A) .col-*

B) Combination of .row and .col-*

C) .row

D) .form-group

2 / 30

2. What is the default class to create a basic table in Bootstrap?

A) .table-default

B) .bootstrap-table

C) .tb-basic

D) .table

3 / 30

3. Which Bootstrap class is used to create a flex-based navigation bar?

A) .nav-flexible

B) .d-flex

C) .flex-navbar

D) .navbar-flex

4 / 30

4. What is the recommended way to override Bootstrap's default spacing (margins & paddings)?

A) Modify $spacer variables in _variables.scss

B) Use inline styles in HTML

C) Modify Bootstrap’s core CSS file

D) Write custom CSS classes

5 / 30

5. Which version of Bootstrap was the first to adopt a mobile-first approach?

A) Bootstrap 1

B) Bootstrap 4

C) Bootstrap 3

D) Bootstrap 2

6 / 30

6. How do you apply different colors to alerts in Bootstrap?

A) Use .color-alert classes

B) Use .alert-primary, .alert-success, .alert-danger, etc.

C) Use .bg-alert classes

D) Use .alert-color classes

7 / 30

7. How do you reverse the order of flex items in Bootstrap?

A) .reverse-flex

B) .flex-reverse

C) .flex-row-reverse

D) .order-reverse

8 / 30

8. Which class transforms text into lowercase letters?

A) .text-smallcase

B) .text-downcase

C) .text-lowercase

D) .text-lower

9 / 30

9. How do you apply different icon colors in Bootstrap?

A) .text-{color} classes

B) .bi-{color}

C) .icon-color

D) .icon-text

10 / 30

10. What Bootstrap class adds borders to a table?

A) .bordered-table

B) .table-line

C) .table-bordered

D) .table-border

11 / 30

11. What file should be modified to use custom Bootstrap fonts?

A) _variables.scss

B) fonts.scss

C) typography.css

D) bootstrap.css

12 / 30

12. Which command installs Bootstrap 5 using Yarn?

A) yarn download bootstrap

B) yarn get bootstrap

C) yarn bootstrap install

D) yarn add bootstrap

13 / 30

13. What was Bootstrap originally called before its public release?

A) Twitter UI

B) Blueprint

C) Twitter Blueprint

D) Bootstrap.js

14 / 30

14. How do you initialize a popover?

A) new bootstrap.Popover()

B) activatePopover()

C) $(‘[data-bs-toggle="popover"]’).popover()

D) popover.show()

15 / 30

15. How do you install Bootstrap in a React project using npm?

A) react-bootstrap install

B) npm install bootstrap

C) bootstrap add react

D) install bootstrap --react

16 / 30

16. How do you create a Bootstrap popover?

A) Use data-bs-toggle="popover"

B) Use .popover-active

C) Use popover-enable="true"

D) Use data-show="popover"

17 / 30

17. What is the main purpose of Bootstrap’s _variables.scss file?

A) To define JavaScript functions

B) To store default styles and variables

C) To manage database connections

D) To link HTML files

18 / 30

18. What is the impact of using Google Fonts in a Bootstrap project?

A) Reduces the need for Bootstrap classes

B) Increases load time if not optimized

C) Improves SEO rankings

D) Loads faster than system fonts

19 / 30

19. What Bootstrap class is used to create justified navigation?

A) .nav-fill

B) .justify-nav

C) .nav-justified

D) .nav-align

20 / 30

20. Which Bootstrap version first removed jQuery dependency?

A) Bootstrap 4

B) Bootstrap 3

C) Bootstrap 6

D) Bootstrap 5

21 / 30

21. What does the $enable-rounded variable control?

A) Enables card borders

B) Enables rounded corners for all elements

C) Enables flexbox in Bootstrap

D) Enables rounded buttons only

22 / 30

22. How does Bootstrap handle performance in dark mode?

A) Dark mode does not affect performance significantly

B) Uses less CSS

C) Requires extra JavaScript processing

D) Reduces HTML file size

23 / 30

23. Which preprocessor is used for customizing Bootstrap?

A) PostCSS

B) Stylus

C) SCSS

D) LESS

24 / 30

24. How can Bootstrap tooltips be optimized for performance?

A) Load tooltips using an external library

B) Remove tooltip JavaScript from Bootstrap

C) Keep all tooltips permanently visible

D) Enable tooltips only when necessary

25 / 30

25. How do you change the hover effect of Bootstrap buttons globally?

A) Use JavaScript to change the hover style

B) Override $btn-hover-bg in _variables.scss

C) Add a .btn:hover class in custom CSS

D) Modify Bootstrap's bootstrap.css file

26 / 30

26. What is the purpose of .lh-lg in Bootstrap?

A) Decreases line height

B) Increases letter spacing

C) Makes text bold

D) Increases line height

27 / 30

27. What Bootstrap class makes an image responsive?

A) .img-fluid

B) .img-auto

C) .responsive-img

D) .img-responsive

28 / 30

28. Which method prevents unnecessary reflows in Bootstrap layouts?

A) Using JavaScript to adjust element sizes

B) Removing all margin and padding

C) Using Flexbox instead of inline-block elements

D) Avoiding Bootstrap classes

29 / 30

29. How do you disable a form input in Bootstrap?

A) disabled attribute

B) .input-disabled

C) .form-disable

D) .form-readonly

30 / 30

30. How do you make text automatically adjust for responsiveness?

A) .text-responsive

B) .text-adapt

C) .text-fluid

D) Bootstrap automatically scales text

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