Ext JS Quiz – Ext JS Multiple Choice Questions and Answers

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Ext JS Quiz – Ext JS Multiple Choice Questions and Answers: What do you know about Ext JS? Come here and expertise your knowledge on ExtJS. Preparing with the repeated ExtJS MCQ Questions and Answers helps you to crack your Placement Tests/ Interviews quickly. As soon as you submit the Online Ext JS MCQ Quiz, you guys can easily check your results with grades/ points. Below is the list of Ext JS Multiple Choice Questions along with the answers which can make you feel comfortable to face the interviews. So, without any hassle, get into the ExtJS Quiz…!!!

Ext JS Quiz – Ext JS Multiple Choice Questions and Answers

ExtJS MCQ Questions and Answers – Exercise Now

What is Ext JS?
a) A JavaScript library for building user interfaces
b) A server-side programming language
c) A database management system
d) A web browser

Answer: a) A JavaScript library for building user interfaces

Explanation: Ext JS is a powerful JavaScript framework that allows developers to create complex and interactive user interfaces for web applications.

Which version of Ext JS introduced the MVVM architecture?
a) Ext JS 2
b) Ext JS 3
c) Ext JS 4
d) Ext JS 5

Answer: c) Ext JS 4

Explanation: Ext JS 4 introduced the Model-View-ViewModel (MVVM) architecture, which allows for a clean separation of concerns and easier maintenance of code.

Which layout manager is used to create a table layout in Ext JS?
a) HBox layout
b) VBox layout
c) Fit layout
d) Table layout

Answer: d) Table layout

Explanation: The Table layout manager in Ext JS allows developers to create a table-based layout for their application, with rows and columns specified using a configuration object.

What is the purpose of a ViewModel in Ext JS?
a) To manage the state and behavior of a component
b) To handle user interactions with a component
c) To manage data for a component and its child components
d) To provide a way to communicate between components

Answer: c) To manage data for a component and its child components

Explanation: The ViewModel in Ext JS is responsible for managing the data that is displayed in a component and its child components, and provides a way to bind this data to the view.

Which of the following is NOT a built-in Ext JS data model type?
a) Float
b) Integer
c) String
d) Date

Answer: a) Float

Explanation: The built-in Ext JS data model types include Integer, String, and Date, but not Float. However, developers can easily define custom data model types as needed.

What is the purpose of the Ext.application() method in Ext JS?
a) To define a new Ext JS component
b) To define a new Ext JS store
c) To define a new Ext JS controller
d) To define a new Ext JS application

Answer: d) To define a new Ext JS application

Explanation: The Ext.application() method is used to define a new Ext JS application, which typically includes one or more views, stores, and controllers.

Which of the following is NOT a valid layout manager in Ext JS?
a) Anchor layout
b) Form layout
c) Grid layout
d) Fit layout

Answer: c) Grid layout

Explanation: While there are many layout managers available in Ext JS, Grid layout is not one of them. However, the Grid component is used to display tabular data in a grid format.

What is the purpose of the Ext.Loader class in Ext JS?
a) To load JavaScript files dynamically
b) To create new Ext JS components
c) To manage data in an Ext JS application
d) To handle user interactions with an Ext JS component

Answer: a) To load JavaScript files dynamically

Explanation: The Ext.Loader class is used to load JavaScript files dynamically in an Ext JS application, which can help to improve performance and reduce the initial loading time of an application.

Which of the following is NOT a built-in Ext JS component?
a) Panel
b) Button
c) List
d) Tree

Answer: c) List

Explanation: While there are many built-in components in Ext JS, List is not one of them. However, developers can easily create custom components as needed.

What is the purpose of the Ext.Ajax class in Ext JS?

a) To handle user interactions with an Ext JS component
b) To manage data in an Ext JS application
c) To load data from a server asynchronously
d) To create new Ext JS components

Answer: c) To load data from a server asynchronously

Explanation: The Ext.Ajax class is used to make asynchronous HTTP requests to a server in an Ext JS application, allowing developers to load data from a server without blocking the user interface.

Which of the following is a valid event in Ext JS?
a) click
b) hover
c) scroll
d) all of the above

Answer: d) all of the above

Explanation: Ext JS supports many different events, including click, hover, and scroll, which can be used to handle user interactions with components.

What is the purpose of the Ext.form.field.Text class in Ext JS?
a) To display text in an Ext JS application
b) To allow users to enter text in a form field
c) To handle user interactions with a component
d) To create new Ext JS components

Answer: b) To allow users to enter text in a form field

Explanation: The Ext.form.field.Text class is used to create a text input field in an Ext JS form, allowing users to enter text data.

Which of the following is NOT a valid data proxy type in Ext JS?
a) Memory proxy
b) Ajax proxy
c) Jsonp proxy
d) Sql proxy

Answer: d) Sql proxy

Explanation: While there are many data proxies available in Ext JS, Sql proxy is not one of them. However, developers can easily create custom data proxies as needed.

What is the purpose of the Ext.direct.Manager class in Ext JS?
a) To create new Ext JS components
b) To handle user interactions with an Ext JS component
c) To manage data in an Ext JS application
d) To provide a way to call server-side methods directly from an Ext JS application

Answer: d) To provide a way to call server-side methods directly from an Ext JS application

Explanation: The Ext.direct.Manager class is used to set up a connection between the client-side and server-side of an Ext JS application, allowing for direct calls to server-side methods without the need for a traditional AJAX request.

Which of the following is a valid layout manager in Ext JS for creating a form layout?
a) HBox layout
b) VBox layout
c) Form layout
d) Grid layout

Answer: c) Form layout

Explanation: The Form layout manager in Ext JS is specifically designed for creating form layouts, with support for labels and input fields.

What is the purpose of the Ext.data.Store class in Ext JS?
a) To create new Ext JS components
b) To handle user interactions with an Ext JS component
c) To manage data in an Ext JS application
d) To load data from a server asynchronously

Answer: c) To manage data in an Ext JS application

Explanation: The Ext.data.Store class is used to manage data in an Ext JS application, including loading data from a server, sorting and filtering data, and handling data changes.

Which of the following is NOT a valid xtype in Ext JS?
a) panel
b) button
c) textbox
d) grid

Answer: c) textbox

Explanation: While there are many valid xtypes in Ext JS, textbox is not one of them. However, developers can easily create custom xtypes as needed.

What is the purpose of the Ext.util.Observable class in Ext JS?
a) To manage data in an Ext JS application
b) To handle user interactions with an Ext JS component
c) To provide a way to call server-side methods directly from an Ext JS application
d) To provide a mechanism for event-driven programming in Ext JS

Answer: d) To provide a mechanism for event-driven programming in Ext JS

Explanation: The Ext.util.Observable class is used to provide event-driven programming functionality in Ext JS, allowing developers to listen for and respond to events triggered by components and other objects in an application.

What is the purpose of the Ext.ComponentQuery class in Ext JS?
a) To manage data in an Ext JS application
b) To handle user interactions with an Ext JS component
c) To provide a way to call server-side methods directly from an Ext JS application
d) To select and manipulate Ext JS components based on CSS-style selectors

Answer: d) To select and manipulate Ext JS components based on CSS-style selectors

Explanation: The Ext.ComponentQuery class provides a powerful mechanism for selecting and manipulating Ext JS components based on CSS-style selectors, allowing developers to easily find and work with specific components in an application.

Which of the following is a valid feature of the Ext JS grid component?
a) Column resizing
b) Sorting
c) Filtering
d) All of the above

Answer: d) All of the above

Explanation: The Ext JS grid component supports many different features, including column resizing, sorting, and filtering, making it a powerful tool for displaying and working with large amounts of data in an application.

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