JavaScript Operator MCQ - Quiz

What is the result of the following code?
`console.log(5 - '5');`

B'55'
C'0'
D'5'

What is the result of the following code?
`console.log(true && false);`

Atrue
Bfalse
D1

What is the result of the following code?

var x = true;
var y = false;
console.log(x || y);

Atrue
Bfalse
C"true"
D"false"

What is the result of the following code?

var obj = {};
console.log(obj instanceof Object);

Atrue
Bfalse
C"true"
D"false"

How many months have a length of 31 days?

AFive
BSix
CSeven
DEight

What is the result of the following code?

var x = 10;
var y = 20;
console.log(x << y);

A100000
B1000
C2000
D1000

What is the result of the following code?

var x = 10;
var y = 20;
console.log(x >> y);

What is the result of the following code?

var x = "Hello";
var y = "World";
console.log(x in y);

Atrue
Bfalse
C"true"
D"false"

What is the result of the following code?

var x = 10;
var y = 20;
console.log(x ^ y);

What is the result of the following code?

var str = "Hello World!";
console.log(str.startsWith("Hello"));

Atrue
Bfalse
C"false"
D"true"

Results:
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JavaScript Operator MCQ - Quiz

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Q: What is the result of the following code?
`console.log(5 - '5');`

B. '55'
C. '0'
D. '5'

Correct Option: A
Remarks:

Explanation:

The result of the code is 0 .
In JavaScript, the - operator performs subtraction if both operands are numbers. .
In this case, the string '5' is converted to the number 5, so the final result is 5 - 5 = 0..

Q: What is the result of the following code?
`console.log(true && false);`

A. true
B. false
D. 1

Correct Option: B
Remarks:

Explanation:

The result of the code is false.
The && operator in JavaScript performs a logical and operation, which means that it returns true only if both operands are truthy.
In this case, the first operand is truthy (true), but the second operand is false then the result is also false

Q: What is the result of the following code?

var x = true;
var y = false;
console.log(x || y);

A. true
B. false
C. "true"
D. "false"

Correct Option: A
Remarks:

Explanation:

The || operator in JavaScript performs a logical OR operation on its operands.
If either operand is truthy, the result is true, otherwise the result is false.
In this case, the first operand (x) is truthy (true), so the result of the || operation is true, regardless of the value of the second operand (y).

Q: What is the result of the following code?

var obj = {};
console.log(obj instanceof Object);

A. true
B. false
C. "true"
D. "false"

Correct Option: A
Remarks:

Explanation:

The instanceof operator in JavaScript is used to determine whether an object is an instance of a particular constructor or class.
In this case, the variable obj has been assigned an empty object.
The instanceof operator is called on obj, with Object as the right operand.
Since obj is an instance of the Object constructor, the instanceof operator will return true.

Q: How many months have a length of 31 days?

A. Five
B. Six
C. Seven
D. Eight

Correct Option: C
Remarks:

Explanation:

Answer: C

Explanation: Seven months have a length of 31 days: January, March, May, July, August, October, and December.

Q: What is the result of the following code?

var x = 10;
var y = 20;
console.log(x << y);

A. 100000
B. 1000
C. 2000
D. 1000

Correct Option: A
Remarks:

Explanation:

The << operator in JavaScript is the left shift operator, which performs a bitwise left shift operation on its operands.
In this case, the << operator is called on x and y, with x as the first operand and y as the second operand.
Since x is 10 and y is 20, the result of the << operator will be the left shift of the binary representation of 10 by 20 bits, which is 100000 in decimal.

Q: What is the result of the following code?

var x = 10;
var y = 20;
console.log(x >> y);

A. 10
B. 2
C. 3

Correct Option: D
Remarks:

Explanation:

The >> operator in JavaScript is the right shift operator, which performs a bitwise right shift operation on its operands.
In this case, the >> operator is called on x and y, with x as the first operand and y as the second operand.
Since x is 10 and y is 20, the result of the >> operator will be the right shift of the binary representation of 10 by 20 bits, which is 0 in decimal.

Q: What is the result of the following code?

var x = "Hello";
var y = "World";
console.log(x in y);

A. true
B. false
C. "true"
D. "false"

Correct Option: B
Remarks:

Explanation:

The in operator in JavaScript is used to determine whether an object has a particular property.
In this case, the in operator is called on x and y, with x as the left operand and y as the right operand.
Since y is a string and does not have any properties, the in operator will return false.

Q: What is the result of the following code?

var x = 10;
var y = 20;
console.log(x ^ y);

A. 10
B. 20
C. 30

Correct Option: C
Remarks:

Explanation:

The ^ operator in JavaScript is the bitwise XOR operator, which performs a bitwise XOR operation on its operands.
In this case, the ^ operator is called on x and y, with x as the first operand and y as the second operand.
Since x is 10 and y is 20, the result of the ^ operator will be the bitwise XOR of the binary representations of 10 and 20, which is 30 in decimal.

Q: What is the result of the following code?

var str = "Hello World!";
console.log(str.startsWith("Hello"));

A. true
B. false
C. "false"
D. "true"

Correct Option: A
Remarks:

Explanation:

The startsWith method in JavaScript is a method that can be called on a string value to determine whether the string starts with the specified string.
In this case, the startsWith method is called on the string "Hello World!", with the string "Hello" as the argument.
Since the string "Hello World!" does start with the string "Hello", the startsWith method will return true.

JavaScript Operator MCQ - Quiz

What is the result of the following code?
`console.log(5 - '5');`

What is the result of the following code?
`console.log(true && false);`

What is the result of the following code?
var x = true; var y = false; console.log(x || y);

What is the result of the following code?
var obj = {}; console.log(obj instanceof Object);

How many months have a length of 31 days?

What is the result of the following code?
var x = 10; var y = 20; console.log(x << y);

What is the result of the following code?
var x = 10; var y = 20; console.log(x >> y);

What is the result of the following code?
var x = "Hello"; var y = "World"; console.log(x in y);

What is the result of the following code?
var x = 10; var y = 20; console.log(x ^ y);

What is the result of the following code?
var str = "Hello World!"; console.log(str.startsWith("Hello"));

JavaScript Operator MCQ - Quiz

What is the result of the following code? console.log(5 - '5');

What is the result of the following code? console.log(true && false);

What is the result of the following code? var x = true; var y = false; console.log(x || y);

What is the result of the following code? var obj = {}; console.log(obj instanceof Object);

How many months have a length of 31 days?

What is the result of the following code? var x = 10; var y = 20; console.log(x << y);

What is the result of the following code? var x = 10; var y = 20; console.log(x >> y);

What is the result of the following code? var x = "Hello"; var y = "World"; console.log(x in y);

What is the result of the following code? var x = 10; var y = 20; console.log(x ^ y);

What is the result of the following code? var str = "Hello World!"; console.log(str.startsWith("Hello"));

What is the result of the following code?
`console.log(5 - '5');`

What is the result of the following code?
`console.log(true && false);`

What is the result of the following code?
var x = true; var y = false; console.log(x || y);

What is the result of the following code?
var obj = {}; console.log(obj instanceof Object);

What is the result of the following code?
var x = 10; var y = 20; console.log(x << y);

What is the result of the following code?
var x = 10; var y = 20; console.log(x >> y);

What is the result of the following code?
var x = "Hello"; var y = "World"; console.log(x in y);

What is the result of the following code?
var x = 10; var y = 20; console.log(x ^ y);

What is the result of the following code?
var str = "Hello World!"; console.log(str.startsWith("Hello"));