A To Z Exams

In Node.js from the following which is true about writable stream

Output of readable stream can be input to a writable stream.

writable stream is used for write operation.

Both of the above.

None of the above

Is Node.js free to use?

Yes

Which of the following is true about internal binding with respect to domain module?

Error emmitter is executing its code within run method of a domain.

Error emmitter is added explicitly to a domain using its add method.

Both of the above.

None of the above.

How can we create instance of http module ?

var http = require("http");

var http = new require("http");

var http = new http();

None of the above

Which of the following module is required to create a child process?

process module

child_process module

child module

web module

A stream fires finish event when all data has been flushed to underlying system.?

True

False

Which of the following code prints process version?

console.log('Current version: ' + process.version());

console.log('Current version: ' + process.version);

console.log('Current version: ' + process.getVersion());

None of the above.

A stream fires error event when there is any error receiving or writing data.

false

true

Which of the following is true about readable stream?

Readable stream is used for read operation.

Output of readable stream can be input to a writable stream.

Both of the above.

None of the above.

Which of the following is true about setTimeout(cb, ms) global function?

The setTimeout(cb, ms) global function is used to run callback cb after at least ms milliseconds.

The setTimeout(cb, ms) function returns an opaque value that represents the timer which can be used to clear the timer.

Both of the above.

None of the above.

Which of the following code converts a buffer buf to JSON object?

buf.toJSON()

buf.json()

buf.covertToJson()

buf.jsonify()

Which of the following is true about package.json?

package.json is present in the root directory of any Node application/module.

package.json is used to define the properties of a package.

package.json can be used to update dependencies of a Node application.

All of the above.

Which of the following is true about Chaining streams ?

Chanining is a mechanism to connect output of one stream to another stream and create a chain of multiple stream operations.

Chanining is normally used with piping operations.

Both of the above.

None of the above.

What is Node.JS?

Node.js is a web server.

Node.js is a JavaScript based framework/platform built on Google Chrome's JavaScript V8 Engine.

Node.js is a java based framework.

None of the above.

All APIs of Node.JS are

Asynchronous

Synchronous

Both of the above.

None of the above.

Which of the following module is required to create a web server?

url module

net module

http module

web module

Which of the following code print the name of operating system?

console.log('type : ' + os.type);

console.log('type : ' + os.type());

console.log('type : ' + os.getType());

None of the above.

Is the code below valid?

var cb0 = function (req, res, next) {
  console.log('CB0')
  next()
}

var cb1 = function (req, res, next) {
  console.log('CB1')
  next()
}

app.get('/example/d', [cb0, cb1], function (req, res, next) {
  console.log('the response will be sent by the next function ...')
  next()
}, function (req, res) {
  res.send('Hello from D!')
})

Yes

To install Node.js express module

$ npm install express

$ node install express

$ install express

None of above

Is the below code valid?

var cb0 = function (req, res, next) {
  console.log('CB0')
  next()
}

var cb1 = function (req, res, next) {
  console.log('CB1')
  next()
}

var cb2 = function (req, res) {
  res.send('Hello from C!')
}

app.get('/example/c', [cb0, cb1, cb2])

Yes

Node.js runs on __________

Client

Server

Both, server and client

None of the above

Which of the following command will show version of npm?

$ npm --version

$ node --version

$ npm getVersion

$ node getVersion

What npm stands for?

Node Package Manager

Node Project Manager

New Project Manager

New Package Manager

Which of the following code prints current directory?

console.log('Current directory: ' + process.cwd());

console.log('Current directory: ' + console.cwd());

console.log('Current directory: ' + process.currenWorkingDirectory());

None of the above.

Which method of fs module is used to close a file?

fs.close(fd, callback)

fs.closeFile(fd, callback)

fs.closePath(fd, callback)

None of the above.

Node.js is ________ by default.

Synchronous

Multi-threaded

Asynchronous

None of the above

In Nodejs what is use of underscore variable in REPL session?

to store the result.

to get the last command used.

None of the above.

to get the last result.

net.isIP(input) returns 4 for IP version 4 addresses.

true

false

How can we create chainable route handlers for a route path in ExpressJS app?

Using app.route()

Using app.router()

Using app.routing()

What are the key features of Node.js ?

Real time Data intensive.

Highly scalable servers for Web Applications.

Builds fast and scalable network Applications.

All of the above

Which method of fs module is used to delete a file?

fs.delete(fd, len, callback)

fs.remove(fd, len, callback)

fs.unlink(path, callback)

None of the above.

Which statement execute the code of sample.js file?

nodejs sample.js

node sample.js

sample.js

None of the above

Is console a global object?

true

false

Route paths, in combination with a request method, define the endpoints at which requests can be made.Which of following are valid form of route path?

strings

string patterns

regular expressions

All of above

Node js is a single threaded application but supports concurrency.

true

false

package.json is is used to define the properties of a package?

True

False

Which of the following is true about EventEmitter.on property?

on property is used to fire event.

on property is used to bind a function with the event.

on property is used to locate an event handler.

None of the above.

Which of following command starts a REPL session?

$ node

$ node start

$ node repl

$ node console

Which of the following is the correct way to get a normalized path?

path.normalize('/test/test1//2slashes/1slash/tab/..')

fs.normalize('/test/test1//2slashes/1slash/tab/..')

os.normalize('/test/test1//2slashes/1slash/tab/..')

None of the above.

In Nodejs how node based web servers differ from traditional web servers ?

Node based server uses a single threaded model and can serve much larger number of requests compared to any traditional server like Apache HTTP Server.

Node based server process request much faster than traditional server.

There is no much difference between the two.

All Of The Above

Which of the following statement is valid to use a Node module fs in a Node based application?

var fs = require("fs");

var fs = import("fs");

package fs;

import fs;

Is process a global object?

true

false

Which of the following is true with respect to Node.

Every API of Node js are asynchronous.

Node being a single thread, and uses async function calls to maintain the concurrency.

Node thread keeps an event loop and whenever any task get completed, it fires the corresponding event which signals the event listener function to get executed.

All of the above.

REPL stands for.

Research Eval Program Learn

Read Eval Print Loop

Read Earn Point Learn

Read Eval Point Loop

The $ npm ls statement is used to list down all the locally installed module?

True

False

Which of the following is true about fork methd of child_process module. ?

The fork method returns object with a built-in communication channel in addition to having all the methods in a normal ChildProcess instance.

The fork() method method is a special case of the spawn() to create Node processes.

Both of the above.

None of the above.

Which of the following is true about fs module of Node?

Every method in fs module have synchronous as well as asynchronous form.

Asynchronous methods of fs module take last parameter as completion function callback and first parameter of the callback function as error.

Both of the above.

None of the above.

How many number of callback functions can be attached to handle a request?

Just one

Unlimited

Which of the following module is required to create a web server?

url module

net module

http module

web module

The $ npm ls -g statement is used to list down all the locally installed module?

True

False

Which of the following statement is valid to use a Node module http in a Node based application?

var http = require("http");

var http = import("http");

package http;

import http;

Which of the following code gets length of a buffer buf?

buf.length

buf.size

buf.length()

buf.size()

Which of the following is true about setInterval(cb, ms) global function?

The setInterval(cb, ms) global function is used to run callback cb repeatedly after at least ms milliseconds.

The setInterval(cb, ms) method returns an opaque value that represents the timer which can be used to clear the timer using the function clearInterval(t).

Both of the above.

None of the above.

Where is captured values are populated regarding route parameters?

req.params object

app.locals object

req.data object

None of above

Transform stream is a type of duplex stream.

true

false

In ExpressJS, the method app.all(path, callback [, callback ...]) can accept all HTTP methods

true

false

Which of the following module is required for exception handling in Node?

web module

net module

domain module

error module

Node.js uses an event-driven, non-blocking I/O model ?

True

False

How can we check the cujrrent version of NPM?

npm --version

npm --ver

npm help

None of the above

Node.js' package ecosystem, npm, is the largest ecosystem of open source libraries in the world. ?

True

False

Node.js supports which of the following platform?

Windows

Macintosh

Unix/Linux

All of the above

How to store local variables that can be access within the application?

Ussing app.locals

Using app.storage

Using database

Config file

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Development - Node Js Test

Test Instructions :

1. The Test is 1hr duration.

2. The Test Paper consists of 30 questions. The maximum marks are 30.

3. All the questions are multiple choice question type with three options for each question.

4. Out of the three options given for each question, only one option is the correct answer.

5. Each question is allotted 1 mark for each correct response.

6. 0.25 will be deducted for incorrect response of each question.

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