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 - Why code written in Node.JS is pretty fast although being written in JavaScript?
A - Node.JS internally converts JavaScript code to Java based code and then execute the same.
B - Node.JS internally converts JavaScript code to C based code and then execute the same.
Answer : C
Explanation
Being built on Google Chrome's V8 JavaScript Engine, Node.js library is very fast in code execution.
Q 2 - Which of the following command will show all the modules installed locally.
Answer : B
Explanation
Executing $ npm ls command will show all the modules installed locally.
Q 3 - Which of the following provides in-built events.
Answer : A
Explanation
Node has multiple in-built events available through events module.
Q 4 - Which of the following is true about Piping streams?
A - Piping is a mechanism where we provide output of one stream as the input to another stream.
Answer : D
Explanation
Piping is a mechanism where we provide output of one stream as the input to another stream. It is normally used to get data from one stream and to pass output of that stream to another stream. There is no limit on piping operations.
Q 5 - Which of the following is true about setInterval(cb, ms) global function?
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).
Answer : A
Explanation
The process object is a global object and can be accessed from anywhere.
Q 7 - Which of the following code print the total free memory of operating system?
A - console.log('free memory : ' + os.freemem() + " bytes.");
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.
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 code can make a request to a web server?
A - http.request(options, callback)
B - http.createRequest(options, callback)
Answer : A
Explanation
http.request(options, callback) method can be used to make a request a web server.
Q 10 - A stream fires error event when there is any error receiving or writing data.
Answer : B
Explanation
A stream fires error event when there is any error receiving or writing data.
