Result Details | Gaurav Vivekanand Urade

Result for: Gaurav Vivekanand Urade

Exam Details

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Exam Name MERN STACK

Email [email protected]

Total Marks 47.0

Score 0.0

Percentage 0.00%

Question Analysis

Sr. No.	Question	Selected Answer	Correct Answer
1	What is the primary purpose of the useState hook in React?	No answer selected	To manage local component state
2	When does a useEffect hook with an empty dependency array [] run?	No answer selected	Only once after the initial mount
3	Why does React use a Virtual DOM?	No answer selected	To optimize UI updates by minimizing direct DOM manipulation
4	How are lifecycle events handled in functional components?	No answer selected	Using Hooks (e.g., useEffect)
5	In Redux, what is the role of a "Reducer"?	No answer selected	To update state based on actions as a pure function
6	What is the best way to pass data from a child component to a parent?	No answer selected	Using Callback functions as props
7	What is the importance of the key prop when rendering lists in React?	No answer selected	To help React identify which items have changed or moved
8	When should you use React.memo?	No answer selected	To prevent unnecessary re-renders of a component
9	What problem does the Context API primarily solve?	No answer selected	Prop Drilling across multiple levels
10	Where should static data be defined in a functional component to avoid re-creation on every render?	No answer selected	Outside the component function
11	What does JSX stand for?	No answer selected	JavaScript XML
12	In a controlled component, where is the form data handled?	No answer selected	By the component's state
13	What is the main benefit of using 'Interfaces' in TypeScript?	No answer selected	Defining the shape/structure of an object
14	What is the purpose of the useParams hook in React Router?	No answer selected	To access dynamic parameters from the URL
15	What is a Higher-Order Component (HOC)?	No answer selected	A function that takes a component and returns a new component
16	Which JavaScript engine powers Node.js?	No answer selected	V8 Engine
17	What is the primary role of 'Middleware' in Express.js?	No answer selected	To execute code during the Request/Response cycle
18	Which HTTP method is typically used to update an existing resource in a REST API?	No answer selected	PUT / PATCH
19	Which Node.js module is used for handling file system operations?	No answer selected	fs
20	How many parts does a JSON Web Token (JWT) consist of?	No answer selected	3
21	How do you define a dynamic path parameter in an Express route?	No answer selected	/user/:id
22	How can you handle asynchronous operations in Node.js?	No answer selected	Using Callbacks, Promises, or Async/Await
23	Which middleware is used to parse JSON bodies in Express 4.x+?	No answer selected	express.json()
24	What is the main purpose of the Node.js Event Loop?	No answer selected	To handle non-blocking I/O operations
25	Why is module.exports used in Node.js?	No answer selected	To share functions or objects between files
26	Is Node.js fundamentally single-threaded?	No answer selected	Yes
27	How many arguments does an Express global error-handling middleware take?	No answer selected	4 (err, req, res, next)
28	What does CORS stand for?	No answer selected	Cross-Origin Resource Sharing
29	What happens when you run npm install --save-dev?	No answer selected	It installs a dependency for development only
30	What is the use of process.env in a Node.js application?	No answer selected	To access environment variables
31	What type of database is MongoDB?	No answer selected	NoSQL (Document-oriented)
32	In MongoDB, what is a single record called?	No answer selected	Document
33	What is the purpose of a 'Schema' in Mongoose?	No answer selected	To define the structure of documents in a collection
34	Which operator is used to update a specific field in a MongoDB document?	No answer selected	$set
35	What is the role of $match in a MongoDB Aggregation Pipeline?	No answer selected	To filter documents based on a condition
36	What is the default port for a MongoDB server?	No answer selected	27017
37	Why is the populate() method used in Mongoose?	No answer selected	To replace IDs with actual documents from other collections
38	A 'Collection' in MongoDB is equivalent to what in SQL?	No answer selected	Table
39	What is the primary benefit of Database Indexing?	No answer selected	To improve query performance speed
40	Is the _id field in a MongoDB document immutable by default?	No answer selected	Yes
41	What is the output of typeof null in JavaScript?	No answer selected	"object"
42	What is a "Closure" in JavaScript?	No answer selected	A function bundled with its lexical environment
43	What does the Array .map() method return?	No answer selected	A new array with transformed elements
44	What is 'Hoisting' in JavaScript?	No answer selected	Moving declarations to the top of their scope
45	What does Promise.all() reject?	No answer selected	As soon as any one promise rejects
46	Which symbol represents the ES6 Spread operator?	No answer selected	...
47	Which symbol represents the ES6 Spread operator?	No answer selected	...

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