Node.js Mock Test

A - There are built-in methods to be used for printing informational, warning and error messages in console.

Answer : A

Explanation

Node.js console is a global object and is used to print different levels of messages to stdout and stderr.

Q 2 - Which of the following is true about console global object?

B - console is used in synchronous way when destination is file or a terminal.

C - console is used in asynchronous way when destination is a pipe.

D - All of the above.

Answer : D

Explanation

Node.js console is a global object and is used to print different levels of messages to stdout and stderr. There are built-in methods to be used for printing informational, warning and error messages. It is used in synchronous way when destination is file or a terminal and asynchronous way when destination is a pipe.

Q 3 - Is process a global object?

A - The process object is an instance of EventEmitter.

Answer : A

Explanation

The process object is a global object and can be accessed from anywhere.

Q 4 - Which of the following is true about process global object?

B - process emits exit event when process is about to exit.

C - process emits uncaughtException when when an exception bubbles all the way back to the event loop.

D - All of the above.

Answer : D

Explanation

The process object is an instance of EventEmitter and emits the above mentioned events.

Q 5 - Which of the following code prints current directory?

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

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

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

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

Answer : A

Explanation

process.cwd() can be used to get the current working directory.

Q 6 - Which of the following code prints process version?

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

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

A - console.log(process.memoryUsage());

Answer : B

Explanation

process.version can be used to get the current process version.

Q 7 - Which of the following code prints memory usage?

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

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

Answer : A

Explanation

process.memoryUsage() can be used to get the memory usage.

Q 8 - Which of the following module is required for operating system specific operations?

A - os module

B - fs module

C - net module

A - console.log('endianness : ' + os.endianness);

Answer : A

Explanation

Node.js os module provides a few basic operating-system related utility functions.

Q 9 - Which of the following code print the endianness of operating system?

B - console.log('endianness : ' + os.endianness());

C - console.log('endianness : ' + os.getEndianness());

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

Answer : B

Explanation

os.endianness() returns the endianness of the CPU. Possible values are "BE" or "LE".

Q 10 - Which of the following code print the name of operating system?

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

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

A - console.log('platform : ' + os.platform);

Answer : B

Explanation

os.type() returns the operating system name.

Q 11 - Which of the following code print the platform of operating system?

B - console.log('platform : ' + os.platform());

C - console.log('platform : ' + os.getPlatform());

A - console.log('total memory : ' + os.totalmem() + " bytes.");

Answer : B

Explanation

os.platform() returns the operating system platform.

Q 12 - Which of the following code print the total system memory of operating system?

B - console.log('total memory : ' + os.totalmem + " bytes.");

C - console.log('total memory : ' + os.getTotalMemory() + " bytes.");

A - console.log('free memory : ' + os.freemem() + " bytes.");

Answer : A

Explanation

os.totalmem() returns the total amount of system memory in bytes.

Q 13 - Which of the following code print the total free memory of operating system?

B - console.log('free memory : ' + os.freemem + " bytes.");

C - console.log('free memory : ' + os.getFreeMemory() + " bytes.");

Answer : A

Explanation

os.freemem() returns the free amount of system memory in bytes.

Q 14 - Which of the following module is required for path specific operations?

A - os module

B - fs module

C - path module

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

Answer : C

Explanation

Node.js path module is used for handling and transforming file paths.

Q 15 - Which of the following is the correct way to get a normalized path?

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

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

A - path.join('/test', 'test1', '2slashes/1slash', 'tab', '..')

Answer : A

Explanation

path.normalize(p) normalizes a string path, taking care of '..' and '.' parts.

Q 16 - Which of the following is the correct way to get a joint path?

B - path.combine('/test', 'test1', '2slashes/1slash', 'tab', '..')

C - buffer.join('/test', 'test1', '2slashes/1slash', 'tab', '..')

A - os.resolve('main.js')

Answer : A

Explanation

path.join([path1][, path2][, ...]) joins all arguments together and normalize the resulting path.

Q 17 - Which of the following is the correct way to get an absolute path?

B - path.resolve('main.js')

C - fs.resolve('main.js')

A - fs.extname('main.js')

Answer : B

Explanation

path.resolve([from ...], to) resolves to an absolute path.

Q 18 - Which of the following is the correct way to get an extension of a file?

B - path.extname('main.js')

C - os.extname('main.js')

Answer : B

Explanation

path.extname(p) returns the extension of the path, from the last '.' to end of string in the last portion of the path. If there is no '.' in the last portion of the path or the first character of it is '.', then it returns an empty string.

Q 19 - Which of the following module is required for network specific operations?

A - os module

B - fs module

C - net module

A - net.createServer([options][, connectionListener])

Answer : C

Explanation

Node.js net module is used to create both servers and clients. This module provides an aynchronous network wrapper.

Q 20 - Which of the following API creates a server?

B - net.connect(options[, connectionListener])

C - net.createConnection(port[, host][, connectListener])

A - net.createServer([options][, connectionListener])

Answer : A

Explanation

net.createServer([options][, connectionListener]) creates a new TCP server. The connectionListener argument is automatically set as a listener for the 'connection' event.

Q 21 - Which of the following API creates a client?

B - net.connect(options[, connectionListener])

C - net.createConnection(port[, host][, connectListener])

Answer : A

Explanation

net.connect(options[, connectionListener]) is a factory method, which returns a new 'net.Socket' and connects to the supplied address and port and can be used to create a client.

Q 22 - net.isIP(input) tests if input is an IP address or not.

Answer : A

Explanation

net.isIP(input) tests if input is an IP address. Returns 0 for invalid strings, returns 4 for IP version 4 addresses, and returns 6 for IP version 6 addresses.

Q 23 - net.isIP(input) returns 0 for invalid input.

Answer : A

Explanation

net.isIP(input) tests if input is an IP address. Returns 0 for invalid strings, returns 4 for IP version 4 addresses, and returns 6 for IP version 6 addresses.

Q 24 - net.isIP(input) returns 4 for IP version 4 addresses.

Answer : A

Explanation

net.isIP(input) tests if input is an IP address. Returns 0 for invalid strings, returns 4 for IP version 4 addresses, and returns 6 for IP version 6 addresses.

Q 25 - net.isIP(input) returns 6 for IP version 6 addresses.