JavaScript MCQ Questions with answers and solutions Page 15

Q. What will be the output of the following JavaScript code?

Code:

<script>  
var string1=[1,2,3];  
  
var string2=[4,5,6,7,8,9,10];  
var result=string1.concat(string2);  
document.writeln(result);  
</script>

(A) 1, 2, 3
(B) Error
(C) It will concatenate both the stings and print as 1, 2, 3, 4, 5, 6, 7, 8, 9 ,10
(D) It will print nothing

💬 Discuss

✅ Correct Answer: (C) It will concatenate both the stings and print as 1, 2, 3, 4, 5, 6, 7, 8, 9 ,10

Published by Yashika ⭐ 3.75K Points at 09-Jun-2022 10:53 pm in JavaScript

Q. What is the primary role of the "return ()" statement in a function body?

(A) It returns the value and continues executing rest of the statements
(B) It returns the value and stops the program execution
(C) Stops executing the function and returns the value
(D) It returns the value and stops executing the function

💬 Discuss

✅ Correct Answer: (D) It returns the value and stops executing the function

Published by Yashika ⭐ 3.75K Points at 09-Jun-2022 10:54 pm in JavaScript

Q. If a function which does not return a value is known as

(A) Static function
(B) Procedures
(C) Method
(D) Dynamic function

💬 Discuss

✅ Correct Answer: (B) Procedures

Published by Yashika ⭐ 3.75K Points at 09-Jun-2022 10:54 pm in JavaScript

Q. The execution of a function stops when the program control encounters the _________ statement in the body of the function.

(A) return statement
(B) continue statement
(C) break statement
(D) goto statement

💬 Discuss

✅ Correct Answer: (A) return statement

Published by Yashika ⭐ 3.75K Points at 09-Jun-2022 10:55 pm in JavaScript

Q. In which events/scenarios, A function name gets optional in JavaScript?

(A) When a function is defined as a looping statement
(B) When the function is called
(C) When a function is defined as expressions
(D) When the function is predefined

💬 Discuss

✅ Correct Answer: (C) When a function is defined as expressions

Published by Yashika ⭐ 3.75K Points at 09-Jun-2022 10:55 pm in JavaScript

Q. In JavaScript, the definition of a function starts with____

(A) With the Return type, Function keyword, Identifier and Parentheses
(B) With the Identifier and Parentheses
(C) With the Return type and Identifier
(D) With the Identifier and Return type

💬 Discuss

✅ Correct Answer: (A) With the Return type, Function keyword, Identifier and Parentheses

Published by Yashika ⭐ 3.75K Points at 09-Jun-2022 10:56 pm in JavaScript

Q. What happens if the return statement has no related expression?

(A) It will return a undefined value
(B) It will throw a exception
(C) It will return the 0 as the value
(D) It will throw a error

💬 Discuss

✅ Correct Answer: (A) It will return a undefined value

Published by Yashika ⭐ 3.75K Points at 09-Jun-2022 10:56 pm in JavaScript

Q. Which one of the following options is the correct output for the given code of JavaScript?

Code:

<script>  
functionprintprops(o)  
{  
for(var ain o)  
console.log(a+": "+ o[a]+"\n");  
}  
</script>

(A) Prints the contents of each property of o
(B) Prints the address of elements
(C) Prints only one property
(D) Returns undefined

💬 Discuss

✅ Correct Answer: (D) Returns undefined

Published by Yashika ⭐ 3.75K Points at 09-Jun-2022 10:57 pm in JavaScript

Q. Which one of the following code is equivalent to call a function "x" of the class "a" which have two arguments g and h?

(A) a,x(g,h);
(B) x(g) &&a.x(g);
(C) x(a,g);
(D) (g,h);

💬 Discuss

✅ Correct Answer: (A) a,x(g,h);

Published by Yashika ⭐ 3.75K Points at 09-Jun-2022 10:58 pm in JavaScript

Q. Which one of the following code is equivalent to the following given code?

Code:

a.x(g,h);

(A) x (g) &&a.x (h);
(B) a [ "x" ] ( g , h );
(C) a (x )[ "g" , "h" ];
(D) x( g&&h );

💬 Discuss

✅ Correct Answer: (B) a [ "x" ] ( g , h );

Published by Yashika ⭐ 3.75K Points at 09-Jun-2022 10:58 pm in JavaScript

JavaScript MCQs with answers Page - 15

Q. What will be the output of the following JavaScript code?

Q. What is the primary role of the "return ()" statement in a function body?

Q. If a function which does not return a value is known as

Q. The execution of a function stops when the program control encounters the _________ statement in the body of the function.

Q. In which events/scenarios, A function name gets optional in JavaScript?

Q. In JavaScript, the definition of a function starts with____

Q. What happens if the return statement has no related expression?

Q. Which one of the following options is the correct output for the given code of JavaScript?

Q. Which one of the following code is equivalent to call a function "x" of the class "a" which have two arguments g and h?

Q. Which one of the following code is equivalent to the following given code?

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