VueJS Quiz - MCQ - Multiple Choice Questions

Vue.js is a JavaScript framework for building user interfaces. It builds on top of standard HTML, CSS, and JavaScript and provides a declarative and component-based programming model that helps you efficiently develop user interfaces, be they simple or complex.

This quiz is designed for beginners and covers the fundamental concepts of VueJS. Each question is followed by an answer and a brief explanation to enhance your understanding. Let's dive in!

1. What is VueJS primarily used for?

A. Backend development

B. Mobile app development

C. Game development

D. Frontend development

Answer:

D. Frontend development

Explanation:

VueJS is primarily a front-end JavaScript framework used for building user interfaces and single-page applications.

2. Which directive is used in VueJS to bind an attribute to an expression?

A. v-for

B. v-bind

C. v-model

D. v-if

Answer:

B. v-bind

Explanation:

The v-bind directive is used to bind an attribute to an expression.

3. What is the VueJS syntax for looping through items in an array?

A. v-repeat

B. v-for

C. v-loop

D. v-iterate

Answer:

B. v-for

Explanation:

v-for is the directive used for looping through arrays or objects in VueJS.

4. In VueJS, which directive is used for two-way data binding on an input element?

A. v-bind

B. v-input

C. v-model

D. v-data

Answer:

C. v-model

Explanation:

v-model directive in VueJS provides two-way data binding on an input element.

5. Which VueJS instance lifecycle hook is called once the instance is mounted onto the DOM?

A. created

B. beforeMount

C. mounted

D. beforeCreate

Answer:

C. mounted

Explanation:

The mounted hook is called after the instance has been mounted.

6. What is Vuex used for in a VueJS application?

A. Animation effects

B. Routing

C. State management

D. Compiling templates

Answer:

C. State management

Explanation:

Vuex is a state management pattern + library for Vue.js applications.

7. In VueJS, how do you define a computed property?

A. Inside the methods object

B. Inside the computed object

C. Inside the props object

D. Inside the data function

Answer:

B. Inside the computed object

Explanation:

Computed properties in VueJS are defined inside the computed object.

8. Which directive is used to conditionally render a block in VueJS?

A. v-show

B. v-bind

C. v-for

D. v-if

Answer:

D. v-if

Explanation:

The v-if directive is used to conditionally render a block.

9. Which of the following can be used to capture DOM events and execute some JavaScript?

A. v-capture

B. v-bind

C. v-for

D. v-on

Answer:

D. v-on

Explanation:

The v-on directive listens to DOM events and executes some JavaScript when they're triggered.

10. What does the Vue CLI command vue create my-project do?

A. Deletes a Vue project named my-project

B. Updates a Vue project named my-project

C. Creates a new Vue project named my-project

D. Opens a Vue project named my-project

Answer:

C. Creates a new Vue project named my-project

Explanation:

The command vue create my-project initializes a new Vue project with the name my-project.

11. Which component option allows you to specify child components?

A. children

B. subs

C. components

D. subcomponents

Answer:

C. components

Explanation:

The components option allows you to specify child components within a parent component.

12. How can you access the properties passed to a Vue component?

A. this.data

B. this.properties

C. this.props

D. this.values

Answer:

C. this.props

Explanation:

In VueJS, you can access the properties passed to a component using this.props.

13. In VueJS, what is a directive that can conditionally apply to a class?

A. v-class

B. v-bind:class

C. v-style

D. v-css

Answer:

B. v-bind:class

Explanation:

The v-bind:class directive can be used to bind classes to a DOM element conditionally.

14. When a Vue instance reaches the end of its lifecycle, which hook is called?

A. beforeDestroy

B. destroyed

C. beforeDelete

D. deleted

Answer:

B. destroyed

Explanation:

The destroyed lifecycle hook is called when a Vue instance has been destroyed.

15. What file extension is commonly associated with single-file Vue components?

A. .vuejs

B. .vjs

C. .v

D. .vue

Answer:

D. .vue

Explanation:

Single-file Vue components typically have a .vue file extension.

16. What is the purpose of a Vue Router in a VueJS application?

A. Component styling

B. Client-side routing

C. State management

D. Data modeling

Answer:

B. Client-side routing

Explanation:

Vue Router is the official router for Vue.js, and it's used for client-side routing.

17. What command is used to install a VueJS plugin?

A. vue add

B. vue install

C. vue plugin

D. vue use

Answer:

A. vue add

Explanation:

The vue add command is used to install and set up Vue plugins.

18. Which Vue directive is used to execute expressions on load of an element?

A. v-load

B. v-on:load

C. v-bind:load

D. v-if:load

Answer:

B. v-on:load

Explanation:

The v-on:load directive is used to execute expressions when an element (like an image) has completely loaded.

19. In VueJS, how do you specify a prop that is required for a component?

A. isRequired: true

B. required: true

C. prop: required

D. mandatory: true

Answer:

B. required: true

Explanation:

Within the props option, you can specify a prop to be required by setting required: true.

20. Which feature of Vue allows for the reuse of component logic across multiple components?

A. Directives

B. Mixins

C. Templates

D. Scaffolds

Answer:

B. Mixins

Explanation:

Mixins in Vue allow developers to reuse component logic across multiple components.

21. What is the role of the computed property in a Vue component?

A. To manage local state

B. To register component methods

C. To store static data values

D. To define reactive getters

Answer:

D. To define reactive getters

Explanation:

In Vue, computed properties are used to define reactive getters that can be used in templates like regular properties, but they derive their values from other reactive dependencies.

22. What would you use to iterate over items in an array in a Vue template?

A. v-loop

B. v-iterate

C. v-repeat

D. v-for

Answer:

D. v-for

Explanation:

The v-for directive in Vue is used to render a list of items by iterating over an array.

23. How do you handle an event like a button click in Vue?

A. v-event:click

B. v-handle:click

C. v-click

D. v-on:click

Answer:

D. v-on:click

Explanation:

The v-on:click directive is used to listen to the click events and execute a method or an expression when the element is clicked.

24. If you want to conditionally render an element in Vue, which directive would you use?

A. v-if

B. v-show

C. Both A and B

D. Neither A nor B

Answer:

C. Both A and B

Explanation:

Both v-if and v-show can be used to conditionally render elements in Vue, but they have different use cases. While v-if completely removes or recreates the element, v-show simply toggles the display CSS property of the element.

25. In Vue single-file components, which tag is used to include the component's template?

A. <script>

B. <vue>

C. <template>

D. <style>

Answer:

C. <template>

Explanation:

In single-file components, the <template> tag is used to encapsulate the component's template.

26. In Vue, how can you prevent the default behavior of an event?

A. using v-prevent

B. using event.prevent()

C. using .prevent modifier

D. using v-stop

Answer:

C. using .prevent modifier

Explanation:

In Vue, you can use the .prevent modifier on an event listener to call event.preventDefault().

27. What is a Vue "filter" used for?

A. Filtering items in an array

B. Performing asynchronous operations

C. Transforming the output of an expression

D. Handling events

Answer:

C. Transforming the output of an expression

Explanation:

Filters are used in Vue templates to transform the raw value of an expression for user display.