Coal India Interview Questions and Answers

A tuple is immutable and uses parentheses, while a list is mutable and uses square brackets in Python.

• Tuples are immutable, meaning their elements cannot be changed after creation

• Lists are mutable, allowing for elements to be added, removed, or modified

• Tuples are created using parentheses, while lists use square brackets

• Example: tuple = (1, 2, 3) vs list = [1, 2, 3]

Access elements in a Python dictionary using keys

• Use square brackets [] with the key to access the value in the dictionary

• Use the get() method to access a value with a default return if the key does not exist

• Use the keys() method to get a list of all keys in the dictionary

It is impossible to accurately determine the exact number of tennis balls in America without specific data.

• The number of tennis balls in America would vary depending on factors such as sales, usage, and production.

• One could estimate the number by considering the population of tennis players, tennis courts, and tennis tournaments in America.

• It would also be helpful to look at the sales figures of tennis balls from major retailers and manufacturers.

• Without specific data, it is ...read more

AA stands for Alcoholics Anonymous, a support group for individuals struggling with alcohol addiction.

• AA is a 12-step program that emphasizes spiritual growth and personal accountability.

• Meetings are held regularly and are open to anyone seeking help with alcohol addiction.

• Anonymity is a key principle of AA, and members are encouraged to maintain confidentiality.

• Sponsorship is also an important aspect of AA, where experienced members provide guidance and support to newcomers.

Virtual DOM is a lightweight copy of the actual DOM, used for efficient updates in web applications.

• Virtual DOM is a concept used in frameworks like React to improve performance by minimizing actual DOM manipulations.

• Changes are first made to the Virtual DOM, then compared with the actual DOM to determine the minimal updates needed.

• This process reduces the number of expensive DOM operations, resulting in faster rendering and improved user experience.

Angular is a full-fledged framework for building web applications, while React is a JavaScript library for building user interfaces.

• Angular is a complete framework with built-in features like routing, forms, and HTTP client.

• React is a library focused on building UI components and managing state.

• Angular uses two-way data binding, while React uses one-way data flow.

• Angular uses TypeScript by default, while React uses JavaScript.

• Angular has a steeper learning curve compared to R...read more