Javascript (JS) Functions MCQ

This section focuses on the "Javascript Functions" of the Javascript. These Multiple Choice Questions (mcq) should be practiced to improve the Javascript skills required for various interviews (campus interview, walk-in interview, company interview), placement, entrance exam and other competitive examinations.

1. Consider the JavaScript code:
Identify the value that will be displayed in alert box at line 5?
function lfc(myname){
console.log(10+"lfc" +12);
}
res=lfc(10);
console.log(res); //line 5


A. 10
B. 10lfc12
C. undefined
D. 10lfc

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2. Consider the JavaScript code:
Choose the correct code to be inserted at line 4 in order to invoke the function.
thisfun=function lfc(x){
console.log(x*x);
}
// line 4


A. thisfun(10)
B. lfc(10)
C. function thisfun(10)
D. None of the above

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3. What will be the output of the below code?
function password(pass) {
for (i = 0; i < pass.length; i++) {
}
}

function name(pname) {
console.log("The value of i is "+i);
for (i = 0; i < pname.length; i++) {
}
}

password("54321");
name("John");


A. 0
B. 5
C. undefined
D. error

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4. What will be the output of the below code?
let chaval= (p)=>p+2;
console.log(chaval(2));

A. 4
B. 22
C. Error: changeVal is not a function
D. undefined

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5. what will be the output of the below code?
num1=5;
function cal() {
num1=10;
num2=5;
num3=num2*num1;
console.log(num3);
}
cal();


A. 25
B. 50
C. 100
D. Error cannot have more than one variable with same name

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6. Functions are invoked as functions or as methods with an __________.

A. invocation statement
B. invocation expression
C. invocation function
D. invocation method

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7. ........ functions need not allow invocations with zero arguments.

A. zero
B. strict
C. empty
D. varargs

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8. When you invoke the........ method on a function f and pass an object o, the method returns a new function.

A. apply()
B. call()
C. bind()
D. string()

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9. Variable declared is example of ___________ Variable.
function message() {
var name = "Bench";
alert(name);
}

A. Local
B. Global
C. Semi-Global
D. None of the above

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10. What is the output for code A and B?
Code A:
var x = 10;
y = --x + 1;
alert(y);

Code B:
var x = 10;
y = x-- + 1;
alert(y);


A. 10,10
B. 10,11
C. 11,10
D. 11,11

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11. A _________ is a group of reusable code which can be called anywhere in your program.

A. exception
B. function
C. loop
D. switch

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12. The most common way to define a function in JavaScript is by using the ____________ keyword.

A. fun
B. var
C. function
D. define

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13. Which statement required if you want to return a value from a function?

A. continue
B. break
C. loop
D. return

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14. Does JavaScript allows us to write our own functions as well?

A. Yes
B. No
C. Can be yes or no
D. Can not say

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15. The Function() constructor expects ______ number of string arguments

A. 0
B. 1
C. 2
D. any

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