JavaScript Multiple Choice Questions

31.Which of the following function of Array object applies a function simultaneously against two values of the array (from right-to-left) as to reduce it to a single value?

A - pop()
B - reduce()
C - push()
D - reduceRight()

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32. What is the output of following Javascript?
var a = 'letsfind';
var b = 'course';
var c = a/b;
document.write(c);

A. letsfindcourse
B. letsfind/course
C. NaN
D. None of the above

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33. How ++ works in Javascript? Find output of below Javascript code.
var a = 1;
document.write(a--);
document.write(a);

A. 00
B. 01
C. 11
D. 10

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34. Find output of below Javascript addition code
document.write("1 plus 1 is " + 1 + 1);

A. 2
B. 1 plus 1 is 2
C. 1 plus 1 is 11
D. 1 plus 1 is 1 + 1

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35.In JavaScript, Arrays are data type. State True or False

A. True
B. False

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36. Does JavaScript allow exception handling?

A. Yes, it provides try, catch as well as throw key word for exception handling
B. Yes, but it provides only try block
C. Yes, but it provides only Try catch block, but does not allow throw exception
D. No

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37. Which of the following method checks if its argument is not a number?

A. isNaN()
B. nonNaN()
C. NaN()
D. None of the above

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38. What if you use parseInt() to convert a string containing decimal value?

A. Throws Error
B. It returns the decimal values in string form
C. If returns only the integer portion of the number
D. None of the listed option

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39. What is the output of below Javascript code?
alert (typeof new Date() );

A. Throws Error
B. object
C. Displays Nothing
D. Current Date

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40. What if we put ++ operator inside if condition? find the output of below code
< script>
var a = 10;
if(a == a++)
document.write(a);

A. Error
B. Nothing is printed
C. 10
D. 11

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