Node.js Online Quiz

Following quiz provides Multiple Choice Questions (MCQs) related to Node.js Framework. You will have to read all the given answers and click over the correct answer. If you are not sure about the answer then you can check the answer using Show Answer button. You can use Next Quiz button to check new set of questions in the quiz.

Q 1 - All APIs of Node.JS are.

A - Asynchronous

B - Synchronous

C - Both of the above.

D - None of the above.

Answer : A

Explanation

All APIs of Node.js library are aynchronous that is non-blocking.

Q 2 - What is use of Underscore Variable in REPL session?

A - to get the last command used.

B - to get the last result.

C - to store the result.

D - None of the above.

Answer : B

Explanation

You can use undercore _ to get the last result.

Q 3 - Buffer class is a global class and can be accessed in application without importing buffer module.

A - true

B - false

Answer : A

Explanation

Buffer class is a global class and can be accessed in application without importing buffer module.

Q 4 - Which method of fs module is used to read a file?

A - fs.open(path, flags[, mode], callback)

B - fs.openFile(path, flags[, mode], callback)

C - fs.openPath(path, flags[, mode], callback)

D - fs.read(fd, buffer, offset, length, position, callback)

Answer : D

Explanation

fs.read(fd, buffer, offset, length, position, callback) is the method which is used to read a file.

Q 5 - Which of the following is true about setInterval(cb, ms) global function?

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

B - 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).

C - Both of the above.

D - None of the above.

Answer : C

Explanation

The setInterval(cb, ms) global function is used to run callback cb repeatedly after at least ms milliseconds. The actual delay depends on external factors like OS timer granularity and system load. - A timer cannot span more than 24.8 days. This function returns an opaque value that represents the timer which can be used to clear the timer using the function clearInterval(t).

Q 6 - 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());

D - None of the above.

Answer : A

Explanation

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

Q 7 - Which of the following code print the total system memory of operating system?

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

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

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

D - None of the above.

Answer : A

Explanation

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

Q 8 - net.isIP(input) returns 0 for invalid input.

A - true

B - false

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

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

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

C - Both of the above.

D - None of the above.

Answer : C

Explanation

The fork() method method is a special case of the spawn() to create Node processes. It returns object with a built-in communication channel in addition to having all the methods in a normal ChildProcess instance.

Q 10 - Which of the following is not a valid HTTP method?

Answer : D

Explanation

header is not a valid HTTP method.

nodejs_questions_answers.htm