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 - How Node based web servers are different from traditional web servers?
A - Node based server process request much faster than traditional server.
Answer : B
Explanation
Node based server uses a single threaded model and can services much larger number of requests than traditional server like Apache HTTP Server.
Answer : A
Explanation
By default, npm installs any dependency in the local mode.
Q 3 - Which of the following is true about EventEmitter.emit property?
A - emit property is used to locate an event handler.
B - emit property is used to bind a function with the event.
Answer : C
Explanation
emit property is used to fire an event.
Q 4 - Which method of fs module is used to get information about file?
A - fs.open(path, flags[, mode], callback)
Answer : B
Explanation
fs.stat(path, callback) is the method which is used to get information about a file.
Q 5 - Which method of fs module is used to delete a file?
A - fs.delete(fd, len, callback)
Answer : C
Explanation
fs.unlink(path, callback) is the method which is used to delete a file.
Q 6 - 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.
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 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.");
Answer : A
Explanation
os.totalmem() returns the total 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 is true about exec methd of child_process module.
A - The exec() method runs a command in a shell and buffers the output.
Answer : D
Explanation
child_process.exec method runs a command in a shell and buffers the output. It returns a buffer with a max size and waits for the process to end and tries to return all the buffered data at once.
Answer : A
Explanation
Each type of Stream is an EventEmitter instance and throws several events at different instance of times.
