Senior Software Engineer Node.js Interview Quiz Practice Questions - Node.js

Question 1

Which of these is NOT a core module in Node.js?

Accepted Answer

D) express

Answer

A) http

Answer

B) fs

Answer

C) path

Question 2

What is the primary purpose of the Node.js event loop?

Accepted Answer

B) To handle asynchronous operations non-blocking I/O

Answer

A) To execute synchronous tasks in a single thread

Answer

C) To manage memory allocation for processes

Answer

D) To compile JavaScript to machine code

Question 3

What does the 'cluster' module in Node.js primarily enable?

Accepted Answer

C) Process forking to utilize multiple CPU cores

Answer

A) Database connection pooling

Answer

B) Multi-threading capabilities

Answer

D) Memory sharing between processes

Question 4

How does Node.js handle memory leaks in long-running applications?

Accepted Answer

A) Automatic garbage collection

Answer

B) Forced process termination

Answer

C) Memory paging to disk

Answer

D) Built-in leak detection and repair

Question 5

What is the significance of the '--inspect' flag when running a Node.js application?

Accepted Answer

B) Activates the Node.js debugger protocol

Answer

A) Enables production mode optimizations

Answer

C) Forces strict mode interpretation

Answer

D) Enables experimental features

Question 6

Which of these is a correct way to handle uncaught exceptions in Node.js?

Accepted Answer

A) process.on('uncaughtException')

Answer

B) try-catch around the entire application

Answer

C) global.exceptionHandler

Answer

D) require('safe-mode')

Question 7

What is the purpose of the 'libuv' library in Node.js?

Accepted Answer

B) Cross-platform asynchronous I/O

Answer

A) JavaScript engine optimization

Answer

C) Package management

Answer

D) TypeScript compilation

Question 8

When would you use 'process.nextTick()' versus 'setImmediate()'?

Accepted Answer

B) nextTick before event loop phases, setImmediate after

Answer

A) nextTick for I/O, setImmediate for CPU

Answer

C) They are interchangeable

Answer

D) nextTick for microtasks, setImmediate for macrotasks

Question 9

What is the main advantage of using streams in Node.js?

Accepted Answer

B) Memory efficiency with large data

Answer

A) Simpler error handling

Answer

C) Automatic parallel processing

Answer

D) Built-in data encryption

Question 10

How does Node.js's module caching work?

Accepted Answer

B) Modules are cached based on file path

Answer

A) Modules are cached per require() call

Answer

C) Modules are never cached

Answer

D) Modules are cached only in production