Computer Knowledge

GUI and Web Frameworks

1,915 Questions

Graphical user interface and web frameworks involve layout management, directives, and application design across platforms like Android and Angular. These concepts are tested in computer science and IT officer competitive exams. Review these questions to understand UI components and coding standards.

Android layout attributesAngular structural directivesVB.Net web methodsJava Swing componentsSiebel application framework

GUI and Web Frameworks Questions

Multiple choice

What is the purpose of the [(ngModel)] directive in Angular?

  1. To bind a form control to a property on a component

  2. To update a property on a component when a form control changes

  3. To validate a form control

  4. All of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The [(ngModel)] directive in Angular is used to bind a form control to a property on a component. It allows you to update the property on the component when the form control changes, and to validate the form control.

Multiple choice

What is the syntax for using the [(ngModel)] directive in Angular?

  1. <input [(ngModel)]="name">

  2. <input [ngModel]="name">

  3. <input (ngModel)="name">

  4. None of the above
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

To use the [(ngModel)] directive in Angular, you specify the property on the component that you want to bind to in the [(ngModel)] attribute. The property must be defined in the component class.

Multiple choice

What is the purpose of the @Input decorator in Angular?

  1. To allow a component to receive data from its parent component

  2. To pass data from a parent component to a child component

  3. To define a property on a component that can be accessed from outside the component

  4. All of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The @Input decorator in Angular allows a component to receive data from its parent component. It can be used to pass data from a parent component to a child component, or to define a property on a component that can be accessed from outside the component.

Multiple choice

What is the purpose of the @Output decorator in Angular?

  1. To allow a component to send data to its parent component

  2. To emit an event when a property on a component changes

  3. To define an event on a component that can be listened to by other components

  4. All of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The @Output decorator in Angular allows a component to send data to its parent component. It can be used to emit an event when a property on a component changes, or to define an event on a component that can be listened to by other components.

Multiple choice

Which of the following is not a valid event type in React?

  1. click

  2. change

  3. submit

  4. hover
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

hover is not a valid event type in React. Instead, you can use the onMouseEnter and onMouseLeave event handlers to handle hover events.

Multiple choice

Which of the following is not a valid way to create a controlled component in React?

  1. Using the value attribute

  2. Using the onChange event handler

  3. Using the useState() hook

  4. Using the useEffect() hook
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

useEffect() hook is not used to create a controlled component in React. The valid ways to create a controlled component are using the value attribute, the onChange event handler, and the useState() hook.

Multiple choice

What is the difference between inline event handlers and event handlers defined in the component class in React?

  1. Inline event handlers are defined directly in the HTML code, while event handlers defined in the component class are defined in the React component class

  2. Inline event handlers are more efficient than event handlers defined in the component class

  3. Inline event handlers are more secure than event handlers defined in the component class

  4. None of the above
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Inline event handlers are defined directly in the HTML code, while event handlers defined in the component class are defined in the React component class.

Multiple choice

Which lifecycle method is called when a React component is first mounted?

  1. componentDidMount

  2. componentWillMount

  3. componentDidUpdate

  4. componentWillUpdate
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The componentDidMount lifecycle method is called when a React component is first mounted. It is a good place to perform tasks such as fetching data from an API or setting up event listeners.

Multiple choice

What is the purpose of the shouldComponentUpdate lifecycle method?

  1. To determine if a React component should update

  2. To update the state of a React component

  3. To fetch data from an API

  4. To set up event listeners
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The shouldComponentUpdate lifecycle method is used to determine if a React component should update. It is a good place to perform a shallow comparison of the new props and state with the old props and state to determine if an update is necessary.

Multiple choice

What is the purpose of the getDerivedStateFromProps lifecycle method?

  1. To update the state of a React component based on the new props

  2. To determine if a React component should update

  3. To fetch data from an API

  4. To set up event listeners
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The getDerivedStateFromProps lifecycle method is used to update the state of a React component based on the new props. It is a good place to perform tasks such as calculating new values or fetching data from an API.

Multiple choice

Which design pattern is commonly used to organize content in a digital app?

  1. Grid

  2. List

  3. Card

  4. All of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Grid, list, and card are all common design patterns used to organize content in digital apps. Grids are used to create a structured layout, lists are used to display items in a sequential order, and cards are used to present information in a concise and visually appealing manner.

Multiple choice

Which design element is commonly used to create a call to action in a digital app?

  1. Button

  2. Link

  3. Image

  4. All of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Buttons, links, and images can all be used to create a call to action in a digital app. These elements are designed to encourage users to take a specific action, such as signing up for a service or making a purchase.

Multiple choice

What CSS property is used to define the duration of an animation?

  1. animation-duration

  2. transition-duration

  3. animation-timing-function

  4. transition-timing-function
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The animation-duration property specifies the length of time that an animation should take to complete one cycle.

Multiple choice

Which CSS property controls the number of times an animation should repeat?

  1. animation-iteration-count

  2. transition-iteration-count

  3. animation-timing-function

  4. transition-timing-function
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The animation-iteration-count property specifies the number of times an animation should repeat before stopping.

Multiple choice

What is the default value for the animation-timing-function property?

  1. ease

  2. linear

  3. ease-in

  4. ease-out
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The default value for the animation-timing-function property is ease, which provides a smooth transition between the start and end states of the animation.