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JavaScript Questions and Answers – Types, Values and Variables | Javascript Online Quiz

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Free download in PDF JavaScript Multiple Choice Questions and Answers for competitive exams. These short objective type questions with answers are very important for Board exams as well as competitive exams like UPSC, NDA, SSC etc. These short solved questions or quizzes are provided by Gkseries./p>

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(1) JavaScript Code can be called by using ___________
[A] RMI
[B] Triggering Event
[C] Preprocessor
[D] Function/Method
Answer: Function/Method
(2) The type of a variable that is volatile is _______________
[A] Volatile variable
[B] Mutable variable
[C] Immutable variable
[D] Dynamic variable
Answer: Mutable variable

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(3) A hexadecimal literal begins with __________
[A] 00
[B] 0x
[C] 0X
[B] Both 0x and 0X
Answer: Both 0x and 0X
(4) The generalised syntax for a real number representation is __________
[A] [digits][.digits][(E|e)[(+|-)]digits]
[B] [digits][+digits][(E|e)[(+|-)]digits]
[C] [digits][(E|e)[(+|-)]digits]
[D] [.digits][digits][(E|e)[(+|-)]digits]
Answer: [digits][.digits][(E|e)[(+|-)]digits]
(5) JavaScript _________ when there is an indefinite or an infinite value during an arithmetic computation.
[A] Prints an exception error
[B] Prints an overflow error
[C] Displays “Infinity”
[D] Prints the value as such
Answer: Displays “Infinity”
(6) Which of the following is not considered as an error in JavaScript?
[A] Syntax error
[B] Missing of semicolons
[C] Division by zero
[D] Missing of Bracket
Answer: Division by zero
(7) The escape sequence ‘\f’ stands for _________
[A] Floating numbers
[B] Representation of functions that returns a value
[C] \f is not present in JavaScript
[D] Form feed
Answer: Form feed
(8) The snippet that has to be used to check if “a” is not equal to “null” is _________
[A] if(a!=null)
[B] if (!a)
[C] if(a!null)
[D] if(a!==null)
Answer: if(a!==null)
(9) The statement a===b refers to _________
[A] Both a and b are equal in value, type and reference address
[B] Both a and b are equal in value
[C] Both a and b are equal in value and type
[D] There is no such statement
Answer: Both a and b are equal in value and type
(10) Assume that we have to convert “false” that is a non-string to string. The command that we use is (without invoking the “new” operator).
[A] false.toString()
[B] String(false)
[C] String newvariable=”false”
[D] Both false.toString() and String(false)
Answer: Both false.toString() and String(false)
(11) What will be the output of the following JavaScript code? function compare() 
{
    int num=2;
    char b=2;
    if(a==b)
        return true;
    else
        return false;
}
[A] true
[B] false
[C] runtime error
[B] compilation error
Answer: true
(12) What will be the output of the following JavaScript code? 
function equalto()
{
    int num=10;
    if(num===”10”)
      return true;
   else
        return false;
}
[A] true
[B] false
[C] runtime error
[D] compilation error
Answer: true
(13) What will be the output of the following JavaScript code? 
function compare()
{
    int a=1;
    char b=1;
    if(a.tostring()===b)
        return true;
    else 
       return false;
}
[A] true
[B] false
[C] runtime error
[D] logical error
Answer: true
(14) What will be the output of the following JavaScript code?

int a==2;

int b=4;

int ans=a+b;

print(ans);

[A] 2
[B] 6
[C] 0
[D] error
Answer: error
(15) What will be the output of the following JavaScript code?

int a=1;

if(a!=null)

return 1;

else

return 0;

[A] 1
[B] 0
[C] runtime error
[D] compiler error
Answer: 1

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