Computer Knowledge

GUI and Web Frameworks

1,711 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

Which lifecycle method is called when a React component is about to be destroyed?

  1. componentDidMount

  2. componentWillMount

  3. componentDidUpdate

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

The componentWillUnmount lifecycle method is called when a React component is about to be destroyed. It is a good place to perform tasks such as cleaning up event listeners or timers.

Multiple choice

Which of the following is not a valid lifecycle method in React?

  1. componentDidMount

  2. componentWillMount

  3. componentDidUpdate

  4. componentWillUpdate

  5. componentWillReceiveProps
Reveal answer Fill a bubble to check yourself
E Correct answer
Explanation

componentWillReceiveProps is not a valid lifecycle method in React. It was deprecated in React 16.3 and should no longer be used.

Multiple choice

What is the purpose of the useCallback hook in React?

  1. To memoize a callback function

  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 useCallback hook is used to memoize a callback function. This means that the callback function will only be recreated if one of its dependencies changes.

Multiple choice

What is the purpose of the useMemo hook in React?

  1. To memoize a value

  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 useMemo hook is used to memoize a value. This means that the value will only be recalculated if one of its dependencies changes.

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.

Multiple choice

Which CSS property is used to specify the delay before an animation starts?

  1. animation-delay

  2. transition-delay

  3. animation-timing-function

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

The animation-delay property specifies the amount of time that should elapse before an animation starts.

Multiple choice

Which CSS property is used to specify the starting point of a transition?

  1. transition-origin

  2. animation-origin

  3. animation-direction

  4. animation-fill-mode
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The transition-origin property specifies the starting point of a transition, which determines the point around which the element will rotate, scale, or move during the transition.

Multiple choice

Which CSS property is used to specify the playback rate of an animation?

  1. animation-play-state

  2. transition-play-state

  3. animation-timing-function

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

The animation-play-state property specifies the playback state of an animation, allowing you to control whether the animation is running, paused, or reversed.

Multiple choice

Which of the following is NOT a common type of user interface widget?

  1. Button

  2. Checkbox

  3. Radio button

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

Slider is not a common type of user interface widget, but rather a type of control.

Multiple choice

Which of the following is NOT a common type of user interface (UI) element used in chatbots?

  1. Buttons

  2. Text fields

  3. Images

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

Emojis are not a common type of user interface (UI) element used in chatbots. While emojis can be used to convey emotions and add visual interest to the conversation, they are not typically used as interactive elements in chatbot UIs.

Multiple choice

What are props in React?

  1. Properties passed from parent components to child components

  2. Methods used to handle user interactions and events

  3. State variables that store data within a component

  4. Hooks that allow you to access React's internal features
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Props (short for properties) in React are used to pass data and information from parent components to their child components. They allow you to define the initial state and behavior of child components.

Multiple choice

How do you define props in a React component?

  1. Using the props keyword in the constructor method

  2. As arguments to the component function

  3. Inside the render() method of the component

  4. Through the use of useState() and useEffect() hooks
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Props are defined as arguments to the component function. When a component is rendered, the props are passed as arguments to the function, allowing you to access and use them within the component.

Multiple choice

How do you access props within a React component?

  1. Using the this.props object

  2. Through the props argument passed to the component function

  3. Inside the render() method using props

  4. Both A and B
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

You can access props within a React component using either the this.props object or through the props argument passed to the component function. Both approaches provide access to the props defined for the component.