Javascript MCQ Questions and Answers Types, Values and Variables

Questions

1 JavaScript Code can be called by using ___________

A RMI

B Triggering Event

C Preprocessor

D Function/Method

View Answer

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

View Answer

Answer: Mutable variable

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3 A hexadecimal literal begins with __________

A 00

B 0x

C 0X

B Both 0x and 0X

View Answer

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]

View Answer

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

View Answer

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

View Answer

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

View Answer

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)

View Answer

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

View Answer

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)

View Answer

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

View Answer

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

View Answer

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

View Answer

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

View Answer

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

View Answer

Answer: 1

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