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Vue.js MCQs with answers

 

  1. What is the purpose of the v-show directive in Vue.js?

    • A. Toggles the visibility of an element based on a condition
    • B. Displays an element conditionally
    • C. Binds a class dynamically
    • D. Creates a sliding transition effect

    Answer: A. Toggles the visibility of an element based on a condition

  2. In Vue.js, what is the purpose of the nextTick function?

    • A. Delays the execution of a function until the next event loop cycle
    • B. Forces an immediate re-render of the component
    • C. Allows for asynchronous execution of methods
    • D. Initializes the component before it is mounted

    Answer: A. Delays the execution of a function until the next event loop cycle

  3. How can you dynamically bind styles to an element based on a condition in Vue.js?

    • A. Using v-style
    • B. Using v-bind with a style object
    • C. Using v-class
    • D. Using v-if with inline styles

    Answer: B. Using v-bind with a style object

  4. What is the role of the .number modifier in Vue.js when using v-model?

    • A. Converts the input value to a string
    • B. Forces the input to accept only numeric values
    • C. Converts the input value to a number
    • D. Rounds the input value to the nearest integer

    Answer: C. Converts the input value to a number

  5. What is the purpose of the .prevent modifier in Vue.js when handling form submissions?

    • A. Stops the default form submission behavior
    • B. Delays the form submission until a later event
    • C. Forces the form to submit immediately
    • D. Prevents the form from being reset

    Answer: A. Stops the default form submission behavior

  6. How does Vue.js handle animations and transitions?

    • A. Using the v-animate directive
    • B. Using CSS classes and the transition component
    • C. Using the v-transition directive
    • D. Automatically with no need for additional configuration

    Answer: B. Using CSS classes and the transition component

  7. What is the purpose of the v-pre directive in Vue.js?

    • A. Exempts an element from being compiled
    • B. Skips compilation for the element and its children
    • C. Marks an element as private
    • D. Prevents an element from being displayed

    Answer: B. Skips compilation for the element and its children

  8. How can you prevent a Vue.js component from being rendered until its data is ready?

    • A. Using the v-show directive
    • B. Using the v-if directive
    • C. Using the beforeMount lifecycle hook
    • D. Using the v-pre directive

    Answer: B. Using the v-if directive

  9. What is the significance of the v-slot directive in Vue.js?

    • A. Defines a custom directive
    • B. Marks a slot as required
    • C. Specifies the position of a slot in the template
    • D. Used for named slots in component composition

    Answer: D. Used for named slots in component composition

  10. In Vue.js, what is the purpose of the computed property?

    • A. Stores data that can be modified by the user
    • B. Performs asynchronous operations
    • C. Calculates derived data based on reactive data
    • D. Manages the state of a component

    Answer: C. Calculates derived data based on reactive data

  11. How can you define a method in Vue.js that executes when a button is clicked?

    • A. Using the v-on:click directive
    • B. Using the @click shorthand
    • C. Both A and B
    • D. Using the v-bind:click directive

    Answer: C. Both A and B

  12. What is the purpose of the v-if and v-else directives in Vue.js?

    • A. Used for conditional rendering
    • B. Defines custom directives
    • C. Handles form submissions
    • D. Adds or removes CSS classes

    Answer: A. Used for conditional rendering

  13. What does the key attribute do when used with v-for in Vue.js?

    • A. Specifies the type of transition effect
    • B. Provides a unique identifier for elements in a list
    • C. Sets the initial value for data properties
    • D. Adds a custom attribute to each element in a list

    Answer: B. Provides a unique identifier for elements in a list

  14. How can you include external libraries like Axios in a Vue.js project?

    • A. Download and manually include the library in the project
    • B. Import the library using the import statement
    • C. Use a CDN link in the HTML file
    • D. All of the above

    Answer: B. Import the library using the import statement

  15. What is the purpose of the v-bind directive in Vue.js?

    • A. Binds an attribute to an expression
    • B. Binds a class dynamically
    • C. Binds an event handler
    • D. Binds a style dynamically

    Answer: A. Binds an attribute to an expression

  16. What is the main role of Vuex in a Vue.js application?

    • A. Manages global state
    • B. Handles routing
    • C. Facilitates component communication
    • D. Provides a way to define mixins

    Answer: A. Manages global state

  17. What is the primary purpose of the v-model directive in Vue.js?

    • A. Binds an input element to a variable
    • B. Handles form submissions
    • C. Defines a model for a component
    • D. Enables two-way data binding on form elements

    Answer: D. Enables two-way data binding on form elements

  18. How can you dynamically switch between multiple components in Vue.js?

    • A. Using the v-if directive
    • B. Using the v-switch directive
    • C. Using the v-bind directive
    • D. Using dynamic components with the :is attribute

    Answer: D. Using dynamic components with the :is attribute

  19. What is the purpose of the v-on directive in Vue.js?

    • A. Binds an attribute to an expression
    • B. Binds a class dynamically
    • C. Binds an event handler
    • D. Binds a style dynamically

    Answer: C. Binds an event handler

  20. Which directive is used for dynamic component creation in Vue.js?

    • A. v-if
    • B. v-switch
    • C. v-bind
    • D. v-on

    Answer: C. v-bind

  21. In Vue.js, what is the purpose of the beforeDestroy lifecycle hook?

    • A. Executed before a component is created
    • B. Invoked before a component is destroyed
    • C. Called before a component is mounted to the DOM
    • D. Executed when a component is updated

    Answer: B. Invoked before a component is destroyed

  22. What is the role of the transition component in Vue.js?

    • A. Manages transitions and animations for elements entering or leaving the DOM
    • B. Defines a custom directive
    • C. Controls the state of a component
    • D. Facilitates communication between parent and child components

    Answer: A. Manages transitions and animations for elements entering or leaving the DOM

  23. What is the purpose of the .sync modifier in Vue.js when using props?

    • A. Enables two-way data binding between parent and child components
    • B. Forces synchronous rendering of components
    • C. Synchronizes data with a server
    • D. Prevents unnecessary re-renders

    Answer: A. Enables two-way data binding between parent and child components

  24. How can you handle asynchronous operations in Vue.js?

    • A. Using the async keyword in methods
    • B. Utilizing the await keyword within lifecycle hooks
    • C. Using promises or async/await syntax
    • D. Both B and C

    Answer: C. Using promises or async/await syntax

  25. What is the purpose of the .trim modifier in Vue.js when using v-model?

    • A. Trims leading and trailing whitespace from the input value
    • B. Converts the input value to lowercase
    • C. Removes all whitespace from the input value
    • D. Prevents user input from being trimmed

    Answer: A. Trims leading and trailing whitespace from the input value

  26. In Vue.js, what is the significance of the mixins option?

    • A. Used for mixing colors in the application
    • B. Enables the use of multiple CSS mixins
    • C. Provides a way to reuse and share component options
    • D. Facilitates communication between sibling components

    Answer: C. Provides a way to reuse and share component options

  27. What is the purpose of the .once modifier in Vue.js event handling?

    • A. Listens to the event only once
    • B. Prevents the default browser behavior
    • C. Adds a one-time delay to the event handler
    • D. Allows the event to propagate only once

    Answer: A. Listens to the event only once

  28. How does Vue.js handle reactivity in its data system?

    • A. By using a reactive programming paradigm
    • B. By implementing a virtual DOM
    • C. Through getter and setter functions
    • D. By using traditional event listeners

    Answer: C. Through getter and setter functions

  29. What is the purpose of the template option in a Vue.js component?

    • A. Defines the structure of the component's HTML
    • B. Specifies the CSS styles for the component
    • C. Configures the component's state
    • D. Declares the data properties for the component

    Answer: A. Defines the structure of the component's HTML

  30. What is the main advantage of using Single File Components in Vue.js?

    • A. Improved SEO
    • B. Simplified project structure
    • C. Enhanced security
    • D. Better performance

    Answer: B. Simplified project structure

  31. What does the .lazy modifier do when used with the v-bind directive in Vue.js?

    • A. Defers the binding until a later event
    • B. Delays the rendering of an element
    • C. Lazily loads the binding data
    • D. Forces immediate binding

    Answer: C. Lazily loads the binding data

  32. In Vue.js, how can you dynamically bind a CSS class based on a condition?

    • A. Using v-bind:class
    • B. Using v-class
    • C. Using v-style
    • D. Using v-if

    Answer: A. Using v-bind:class

  33. What is the purpose of the v-pre directive in Vue.js?

    • A. Prevents a directive from being compiled
    • B. Skips compilation for the element and its children
    • C. Prevents a component from rendering
    • D. Allows using raw HTML in an element

    Answer: B. Skips compilation for the element and its children

  34. How can you handle errors in a Vue.js application?

    • A. Using try...catch blocks in the template
    • B. Utilizing the error lifecycle hook
    • C. Implementing a global error handler
    • D. Both B and C

    Answer: D. Both B and C

  35. What is the purpose of the ref attribute in Vue.js?

    • A. Represents a reference to a component's data
    • B. Provides a way to reference an element or component in the template
    • C. Specifies the routing configuration for a component
    • D. Defines the relationship between parent and child components

    Answer: B. Provides a way to reference an element or component in the template

  36. In Vue.js, what is the purpose of the .once modifier when binding an event?

    • A. Delays the execution of the event handler
    • B. Stops the event propagation to parent elements
    • C. Binds the event listener only once
    • D. Prevents the default browser behavior

    Answer: C. Binds the event listener only once

  37. How can you perform unit testing in Vue.js components?

    • A. Using the vue-test-utils library with Jest or Mocha
    • B. Utilizing the v-test directive
    • C. Using the vue-testing-library with Karma
    • D. Both A and C

    Answer: A. Using the vue-test-utils library with Jest or Mocha

  38. What is the purpose of the .exact modifier in Vue Router?

    • A. Matches the route exactly without considering nested routes
    • B. Executes the route handler exactly once
    • C. Forces an exact match for dynamic route segments
    • D. Allows case-sensitive matching for routes

    Answer: A. Matches the route exactly without considering nested routes

  39. What does the v-once directive do in Vue.js?

    • A. Renders the element and its children only once
    • B. Binds an event listener that fires only once
    • C. Executes the event handler only once
    • D. Applies a one-time data binding to an element

    Answer: A. Renders the element and its children only once

  40. In Vue.js, what does the $refs property allow you to access?

    • A. Parent component data
    • B. Child component data
    • C. DOM elements or child components
    • D. Vuex store state

    Answer: C. DOM elements or child components

  41. What is the purpose of the v-pre directive in Vue.js?

    • A. Skips compilation for the element and its children
    • B. Prevents a component from rendering
    • C. Allows using raw HTML in an element
    • D. Prevents a directive from being compiled

    Answer: A. Skips compilation for the element and its children

  42. How can you conditionally render content based on whether a property exists in Vue.js?

    • A. Using v-if with a condition checking for property existence
    • B. Using v-show with a condition checking for property existence
    • C. Using v-bind with a condition checking for property existence
    • D. Using v-switch with a condition checking for property existence

    Answer: A. Using v-if with a condition checking for property existence

  43. What is the purpose of the extends option in a Vue.js component?

    • A. Extends the lifecycle of the component
    • B. Inheritance of data properties from a parent component
    • C. Allows components to extend each other
    • D. It is not a valid option in Vue.js components

    Answer: B. Inheritance of data properties from a parent component

  44. How do you handle asynchronous operations in Vue.js components?

    • A. Using async and await in the mounted lifecycle hook
    • B. Using Promises in the created and mounted lifecycle hooks
    • C. Handling asynchronous operations directly in the template
    • D. Using the asyncData hook provided by Nuxt.js

    Answer: B. Using Promises in the created and mounted lifecycle hooks

  45. Which directive is used to bind an attribute conditionally in Vue.js?

    • A. v-attribute
    • B. v-bind
    • C. v-condition
    • D. v-attr

    Answer: B. v-bind

  46. What is the purpose of the .capture modifier in Vue.js event handling?

    • A. Captures the event and prevents it from reaching the target
    • B. Delays the execution of the event handler
    • C. Stops the event propagation to parent elements
    • D. Adds a debounce to the event

    Answer: A. Captures the event and prevents it from reaching the target

  47. In Vue.js, what is the significance of the nextTick method?

    • A. Delays the execution of a function until the next tick of the event loop
    • B. Executes a function immediately
    • C. Used for transitioning between different routes
    • D. Updates the DOM in real-time

    Answer: A. Delays the execution of a function until the next tick of the event loop

  48. What is the purpose of the v-html directive in Vue.js?

    • A. Binds an attribute to a variable
    • B. Inserts raw HTML content into an element
    • C. Conditionally shows or hides an element
    • D. Binds a class dynamically

    Answer: B. Inserts raw HTML content into an element

  49. How do you define a custom event in a child component and listen for it in a parent component in Vue.js?

    • A. Using the v-on directive in the parent and $emit in the child
    • B. Using the v-emit directive in the parent and $on in the child
    • C. Using the v-model directive in the parent and $emit in the child
    • D. Using the v-bind directive in the parent and $emit in the child

    Answer: A. Using the v-on directive in the parent and $emit in the child

  50. What is the purpose of the .once modifier in Vue.js event handling?

    • A. Stops the event propagation to parent elements
    • B. Executes the event handler only once
    • C. Prevents the default browser behavior
    • D. Delays the execution of the event handler

    Answer: B. Executes the event handler only once

  51. Which Vue.js lifecycle hook is called when a component is inserted into the DOM?

    • A. beforeCreate
    • B. created
    • C. beforeMount
    • D. mounted

    Answer: D. mounted

  52. What is the purpose of the .prevent modifier in Vue.js event handling?

    • A. Stops the event propagation to parent elements
    • B. Prevents the default browser behavior
    • C. Delays the execution of the event handler
    • D. Adds a debounce to the event

    Answer: B. Prevents the default browser behavior

  53. How do you dynamically bind a class to an element in Vue.js based on a condition?

    • A. Using v-if with a condition checking for class existence
    • B. Using v-bind with a condition checking for class existence
    • C. Using v-switch with a condition checking for class existence
    • D. Using v-class with a condition checking for class existence

    Answer: B. Using v-bind with a condition checking for class existence

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