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Vue.js Basics

1/25 Which of the following directives is to used for attaching event listeners that invoke methods?
- v-for
- v-on
- v-model
- v-bind
2/25 What keyword is used for generating a constant in Vue.js?
- Define
- Const
- None of the above.
3/25 All are life cycle hooks in Vue except ...
- beforeCreate
- created
- mounted
- beforeMount
- didMount
4/25 In Vue.js, what is the role of the 'watch' property?
- To perform deep object comparisons
- To execute a function when a specific data property changes
- To bind data to template elements
- To loop through items in an array
5/25 How can you pass data from a parent to a child component in Vue.js?
- Using the $emit method
- Using the $parent property
- Using props
- Using global state management
6/25 What is the purpose of the 'v-bind' directive in Vue.js?
- To bind class and style properties
- To bind DOM properties to data
- To display text content
- To define methods for event handling
7/25 Which Vue.js lifecycle hook should be used for fetching data when a component is created?
- mounted
- created
- beforeCreate
- beforeMount
8/25 What is the purpose of the 'mixins' feature in Vue.js?
- For styling components
- For sharing functionality between components
- For rendering components on the server side
- For managing application state
9/25 What is the default port number Vue CLI serves the application on?
- 3000
- 8080
- 8000
- 5000
10/25 In Vue.js, what is a 'directive' primarily used for?
- To manage state
- To perform HTTP requests
- To manipulate the DOM
- To define methods
11/25 How can you make a Vue.js component reactive to changes in an object that was not reactive initially?
- Using Vue.set(object, key, value)
- This is not possible in Vue.js
- By reassigning the object
- Using object.key = value
12/25 Which lifecycle hook in Vue.js is called right after the DOM has been updated?
- created
- beforeUpdate
- updated
- mounted
13/25 How is 'Vue.nextTick()' primarily used in Vue.js?
- For error handling
- To wait for the next DOM update cycle before executing code
- To trigger a component update
- To delay a method execution
14/25 What is the typical use case for the 'created' lifecycle hook in Vue.js?
- To manipulate the DOM
- To initialize data, set up event listeners, and start timers
- To fetch server-side data
- To integrate with other JavaScript libraries
15/25 What is the main use of the 'v-pre' directive in Vue.js?
- To pre-load data before rendering a component
- To skip compilation for this element and all its children
- To give priority rendering to an element
- To preserve the original state of an element
16/25 In Vue.js, what is the effect of using the 'v-once' directive on a component?
- It destroys the component after one use
- It renders the component only once, and subsequent re-renders are ignored
- It listens for an event only once
- It applies a CSS class to an element only once
17/25 In Vue.js, what does the 'functional' attribute in a component definition do?
- It makes the component stateful
- It indicates the component is purely functional and stateless
- It enhances the performance of the component
- It allows the component to maintain its own state
18/25 In Vue.js, what is the 'el' property used for in a Vue instance?
- To define the element to mount the Vue instance on
- To specify the parent element for the instance
- To declare reactive properties
- To set the template for the instance
19/25 What is the primary use of the 'props' option in a Vue.js component?
- To pass data to child components
- To receive data from parent components
- To store internal component state
- To define computed properties
20/25 What is the purpose of the 'nextTick' method in Vue.js?
- To delay a function execution until the next DOM update cycle
- To navigate to the next route in Vue Router
- To proceed to the next item in a v-for loop
- To update data properties in the next component update
21/25 What is the role of the 'key' attribute in a Vue.js 'v-for' loop?
- To provide a unique identifier for each element in the loop
- To define the index of each item in the loop
- To increase performance by reusing elements
- To specify the loop's execution order
22/25 In Vue.js, how do you emit an event from a child component to its parent?
- this.$emit('eventName')
- Vue.emit('eventName')
- this.$parent.emit('eventName')
- this.$dispatch('eventName')
23/25 What is the primary function of the 'computed' properties in Vue.js?
- To store and manage global state
- To execute functions upon event triggering
- To calculate derived state based on reactive data
- To bind DOM elements to component data
24/25 In Vue.js, what is the purpose of the 'ref' attribute?
- To reference a DOM or component instance
- To define a repeating element in 'v-for'
- To store data references for reactivity
- To set up a two-way data binding
25/25 Which of the following is true about Vue.js mixins?
- Mixins are primarily used for styling components
- Mixins are used to distribute reusable functionalities for Vue components
- Mixins can only be applied globally
- Mixins override the component's own methods and properties
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