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Vue.js Basics

1/25 Which of the directives below provide a two-way binding?
- none
- v-inline
- v-model
- v-on
2/25 Which of the following directives is to used for attaching event listeners that invoke methods?
- v-for
- v-on
- v-model
- v-bind
3/25 How to use for loop in Vue.js?
- vFor
- *v-for
- v-for
- *ngFor
4/25 What is used to dynamically bind one or more attributes either a component property to an expression?
- v-pre
- v-bind
- v-once
- v-html
5/25 What event modifier is used for performing the click event only for one time?
- <a @click.once="dotask"></a>
- <a @click.prevent-once="dotask"></a>
- <a @click.stop="dotask"></a>
- <a @click.passive="dotask"></a>
6/25 How can you pass data from a parent to a child component in Vue.js?
- Using the $emit method
- Using the $parent property
- Using props
- Using global state management
7/25 In Vue.js, how can you listen to native DOM events on a custom component?
- Using the '.native' modifier on a 'v-on' directive
- Using the 'v-model' directive
- Using the 'v-if' directive
- Using the 'v-show' directive
8/25 Which Vue.js lifecycle hook should be used for fetching data when a component is created?
- mounted
- created
- beforeCreate
- beforeMount
9/25 What is the purpose of the 'mixins' feature in Vue.js?
- For styling components
- For sharing functionality between components
- For rendering components on the server side
- For managing application state
10/25 Which command is used to create a new Vue.js project using Vue CLI?
- vue create project-name
- vue new project-name
- vue init project-name
- vue start project-name
11/25 How can you make a Vue.js component reactive to changes in an object that was not reactive initially?
- Using Vue.set(object, key, value)
- This is not possible in Vue.js
- By reassigning the object
- Using object.key = value
12/25 Which lifecycle hook in Vue.js is called right after the DOM has been updated?
- created
- beforeUpdate
- updated
- mounted
13/25 How is 'Vue.nextTick()' primarily used in Vue.js?
- For error handling
- To wait for the next DOM update cycle before executing code
- To trigger a component update
- To delay a method execution
14/25 In Vue.js, which option is used to define a component's initial data state?
- data: {}
- state: {}
- model: {}
- props: {}
15/25 In Vue.js, how can you access the root Vue instance within a component?
- this.$root
- Vue.$root
- this.$parent.root
- this.root
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 What is the correct way to declare a reactive property in a Vue.js component that is not part of the data object?
- Vue.reactiveProperty('newProp')
- this.$set(this, 'newProp', value)
- this.newProp = Vue.observable(value)
- Vue.defineProperty(this, 'newProp', { value })
18/25 Which statement is true about the 'destroyed' lifecycle hook in Vue.js?
- It is called before the component is removed from the DOM
- It is used to clean up event listeners and reactive subscriptions
- It can be used to prevent a component from being destroyed
- It is called immediately after the component is created
19/25 How can you define a prop in a Vue.js component that expects a specific data type?
- props: { propName: 'String' }
- props: { propName: String }
- props: ['propName: String']
- props: { propName: { type: 'String' } }
20/25 In Vue.js, which of the following is a correct way to make a deep watch on an object?
- watch: { 'object': { deep: true } }
- watch: { object: { handler: 'method', deep: true } }
- watch: { object.deep: 'method' }
- this.$watch('object', 'method', { deep: true })
21/25 What is the purpose of the 'name' property in a Vue.js component?
- To specify the name used in the DOM
- To define the component's name for recursive calls
- To set the name attribute on the root element
- To identify the component in Vue Devtools
22/25 Which method is commonly used for manual reactivity in Vue.js?
- Vue.set(object, key, value)
- Vue.reactify(object, key, value)
- this.$forceUpdate()
- Vue.observable(object)
23/25 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
24/25 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
25/25 In Vue.js, what is the recommended way to pass data to a child component?
- Using 'v-bind' to bind data to the child component's attributes
- Directly setting properties on the child component instance
- Using a global event bus
- By modifying the child component's 'data' object
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