JavaScript 1000+ MCQ with answer for FCI Recruitment

for(var num=10;num>=1;num--)
{
document.writeln(num);
}

var num=10;
while(num>=1)
{
document.writeln(num);
num++;
}

int size=5;
int a=5;
int size=4;
for(int j=size;j>=0;j--)
{
console.log(a);
a=a-2;
}

int a=4;
int b=1;
int c=0;
If(a==b)
document.write(a);
else if(a==c)
document.write(a);
else
document.write(c);

function f(o)
{
if (o === undefined) debugger;
}

var grade='A';
var result;
switch(grade)
{
case 'A':
result+=10;
case 'B':
result+= 9;
case 'C':
result+= 8;
default:
result+= 0;
}
document.write(result);

var arr=[1,2,3];
var rev=arr.reverse();
document.writeln(rev);

function equalto()
{
int num=10;
if(num===10)
return true;
else
return false;
}

var arr = [7, 5, 9, 1];
var value = Math.max.apply(null, arr);
document.writeln(value);

const obj1 =
{
property1: 21
}
const descriptor1 = Object.getOwnPropertyDescriptor(obj1, 'property1');
console.log(descriptor1.configurable);
console.log(descriptor1.enumerable);

function constfuncs()
{
var funcs = [];
for(var i = 0; i < 10; i++)
funcs[i] = function() { return i; };
return funcs;
}
var funcs = constfuncs();
funcs[5]()

var text = testing: 1, 2, 3; // Sample text
var pattern = /d+/g // Matches all instances of one or more digits

!!(obj1 && obj2);
(obj1 && obj2);

o = {x:1, y:{z:[false,null,]}};
s = JSON.stringify(o);
p = JSON.parse(s);

switch(expression)
{
statements
}

const obj = {prop: 12};
Object.preventExtensions(obj);
console.log( Object.isExtensible(obj));

var a = [];
a.unshift(1);
a.unshift(22);
a.shift();
a.unshift(3,[4,5]);
a.shift();
a.shift();
a.shift();

var tensquared = (function(x) {return x*x;}(10));

var grade='E';
var result;
switch(grade)
{
case 'A':
result+=10;
case 'B':
result+= 9;
case 'C':
result+= 8;
default:
result+= 0;
}
document.write(result);

<script>
var x = 10;
x *= 5;
document.getElementById("demo").innerHTML = x;
</script>

var string1 = 123;
var intvalue = 123;
alert( string1 + intvalue );

for(var p in o)
console.log(o[p]);

var a = 10;
do {
a += 1;
console.log(a);
} while (a < 5);

var val1=[1,2,3];
var val2=[6,7,8];
var result=val1.concat(val2);
document.writeln(result);

int a==2;
int b=4;
int ans=a+b;
print(ans);

<script>
txt1 = “ one”;
txt1 += “two”;
document.getElementById("demo").innerHTML = txt1;
</script>

var count = 0;
while (count < 10)
{
console.log(count);
count++;
}

function f() {};

function printArray(a)
{
var len = a.length, i = 0;
if (len == 0)
console.log(Empty Array);
else
{
do
{
console.log(a[i]);
} while (++i < len);
}
}

if (!a[i]) continue;

var o = new Object();