Learn JavaScript MCQ Questions with answers and solutions.

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Q. When will the finally block be called?

(A) When there is no exception
(B) When the catch doesnot match
(C) When there is exception
(D) None of the mentioned

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Q. Which of the following is the descendant operator?

(A) ..
(B) …
(C) *
(D) @

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Q. Which of the following is an example to perform the most common XML manipulations using the XML objects invocation?

(A) insertChildBefore()
(B) insertChildAfter()
(C) appendChildAfter(…)
(D) appendChildBefore(…)

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Q. The main difference between the variables declared with var and with let is

(A) var is confined to a particular function but let is not
(B) let is confined to a particular function but var is not
(C) var defines values based on conditions but let does not
(D) none of the mentioned

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Q. Consider the following code snippet
function oddsums(n)
{
let total = 0, result=[];
for(let x = 1; x <= n; x++)
{
let odd = 2*x-1;
total += odd;
result.push(total);
}
return result;
}

What would be the output if
oddsums(5);
is executed afted the above code snippet ?

(A) Returns [1,4,9,16,25]
(B) Returns [1,2,3,4,5]
(C) Returns [3,6,9,12,15]
(D) Returns [1,3,5,7,9]

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Q. Consider the following code snippet
console.log(p)
If p is not defined, what would be the result or type of error?

(A) Zero
(B) Null
(C) ReferenceError
(D) ValueNotFoundError

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Q. Consider the following code snippet
let x=x+1;
console.log(x);
What will be the result for the above code snippet?

(A) 0
(B) Null
(C) ReferenceError
(D) NaN

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Q. Consider the following code snippet
[x,y]=[y,x];
What is the result of the above code snippet?

(A) Throws exception
(B) Swap the value of the two variables
(C) Flashes an error
(D) Creates a new reference object

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Q. Which looping statement allows XML tags to appear in JavaScript programs and adds API for operating on XML data?

(A) for loop
(B) while loop
(C) for/each loop
(D) all of the mentioned

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Q. Which exception does the Iterators throw from their next() method when there are no more values to iterate, that work on finite collections ?

(A) ExitIteration
(B) AbortIteration
(C) Abort
(D) StopIteration

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JavaScript MCQs with answers Page - 72

Q. When will the finally block be called?

Q. Which of the following is the descendant operator?

Q. Which of the following is an example to perform the most common XML manipulations using the XML objects invocation?

Q. The main difference between the variables declared with var and with let is

Q. Consider the following code snippet
function oddsums(n)
{
let total = 0, result=[];
for(let x = 1; x <= n; x++)
{
let odd = 2*x-1;
total += odd;
result.push(total);
}
return result;
}

What would be the output if
oddsums(5);
is executed afted the above code snippet ?

Q. Consider the following code snippet
console.log(p)
If p is not defined, what would be the result or type of error?

Q. Consider the following code snippet
let x=x+1;
console.log(x);
What will be the result for the above code snippet?

Q. Consider the following code snippet
[x,y]=[y,x];
What is the result of the above code snippet?

Q. Which looping statement allows XML tags to appear in JavaScript programs and adds API for operating on XML data?

Q. Which exception does the Iterators throw from their next() method when there are no more values to iterate, that work on finite collections ?

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JavaScript MCQs with answers Page - 72

Q. When will the finally block be called?

Q. Which of the following is the descendant operator?

Q. Which of the following is an example to perform the most common XML manipulations using the XML objects invocation?

Q. The main difference between the variables declared with var and with let is

Q. Consider the following code snippet function oddsums(n) { let total = 0, result=[]; for(let x = 1; x <= n; x++) { let odd = 2*x-1; total += odd; result.push(total); } return result; } What would be the output if oddsums(5); is executed afted the above code snippet ?

Q. Consider the following code snippet console.log(p) If p is not defined, what would be the result or type of error?

Q. Consider the following code snippet let x=x+1; console.log(x); What will be the result for the above code snippet?

Q. Consider the following code snippet [x,y]=[y,x]; What is the result of the above code snippet?

Q. Which looping statement allows XML tags to appear in JavaScript programs and adds API for operating on XML data?

Q. Which exception does the Iterators throw from their next() method when there are no more values to iterate, that work on finite collections ?

Add MCQ in this Category

Browse Categories

Q. Consider the following code snippet
function oddsums(n)
{
let total = 0, result=[];
for(let x = 1; x <= n; x++)
{
let odd = 2*x-1;
total += odd;
result.push(total);
}
return result;
}

What would be the output if
oddsums(5);
is executed afted the above code snippet ?

Q. Consider the following code snippet
console.log(p)
If p is not defined, what would be the result or type of error?

Q. Consider the following code snippet
let x=x+1;
console.log(x);
What will be the result for the above code snippet?

Q. Consider the following code snippet
[x,y]=[y,x];
What is the result of the above code snippet?