Bootstrap MCQs – Forms and Inputs

Bootstrap 5 provides a modern, flexible, and responsive way to style forms and input fields without writing custom CSS. It includes form controls, validation, input groups, floating labels, and utility classes that enhance user experience.

Understanding these form-related components is essential for interview preparation as they are widely used in real-world applications. These top MCQs help you understand how Bootstrap enhances form elements and prepares you for interview questions on web development.

1.) Which Bootstrap class is used to style input fields?

A) .form-control
B) .input-style
C) .bootstrap-input
D) .input-control

Answer: Option A

Explanation: The .form-control class applies Bootstrap’s default styling to input fields.

2.) What is the correct class to make a form input read-only?

A) .form-disable
B) .form-static
C) .form-readonly
D) readonly attribute

Answer: Option D

Explanation: The readonly attribute prevents users from modifying the input value while still allowing them to copy it.

3.) Which class is used to create a form label in Bootstrap?

A) .label-form
B) .label-control
C) .form-label
D) .form-input-label

Answer: Option A

Explanation: .form-label is used to style labels in Bootstrap forms.

4.) Which Bootstrap class is used to create a form with horizontal layout?

A) .form-horizontal
B) .form-group
C) .row
D) .form-inline

Answer: Option A

Explanation: .form-horizontal arranges form fields in a single horizontal row instead of stacking them.

5.) What is the purpose of .form-floating in Bootstrap?

A) Adds animation effects to input fields
B) Makes the form responsive
C) Aligns form fields horizontally
D) Creates a floating input label

Answer: Option D

Explanation: .form-floating allows input labels to float above the field when the user types.

6.) How can you create a larger input field in Bootstrap?

A) .form-large
B) .form-size-lg
C) .form-control-lg
D) .input-big

Answer: Option C

Explanation: .form-control-lg increases the height of input fields for better visibility.

7.) What is the Bootstrap class for a smaller input field?

A) .form-control-sm
B) .form-small
C) .input-sm
D) .form-sm

Answer: Option A

Explanation: .form-control-sm reduces the height of input fields.

8.) Which class is used to group a label and an input field together?

A) .input-label-group
B) .form-group
C) .form-container
D) .form-block

Answer: Option B

Explanation: .form-group provides proper spacing and structure between a label and its input field.

9.) What Bootstrap class adds a checkbox to a form?

A) .checkbox
B) .form-checkbox
C) .form-check-input
D) .checkbox-group

Answer: Option C

Explanation: .form-check-input is the standard class for Bootstrap-styled checkboxes.

10.) Which class is used for radio buttons in Bootstrap?

A) .radio-input
B) .form-radio
C) .radio-button
D) .form-check-input

Answer: Option D

Explanation: Bootstrap uses .form-check-input for radio buttons and checkboxes.

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