Javascript - CS - CSE Questions and Answers

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The type of a variable that is volatile is

Volatile variable

Mutable variable

Immutable variable

Dynamic variable

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A hexadecimal literal begins with

Both 0x and 0X

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The generalised syntax for a real number representation is

[digits][.digits][(E|e)[(+|-)]digits]

[digits][+digits][(E|e)[(+|-)]digits]

[digits][(E|e)[(+|-)]digits]

[.digits][digits][(E|e)[(+|-)]digits]

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When there is an indefinite or an infinity value during an arithmetic value computation, javascript

Prints an exception error

Prints an overflow error

Displays “Infinity”

Prints the value as such

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Which of the following is not considered as an error in JavaScript?

Syntax error

Missing of semicolons

Division by zero

All of the mentioned

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The escape sequence ‘f’ stands for

Floating numbers

Representation of functions that returns a value

f is not present in JavaScript

Form feed

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The snippet that has to be used to check if “a” is not equal to “null” is

if(a!=null)

if (!a)

if(a!null)

if(a!==null)

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The statement a===b refers to

Both a and b are equal in value, type and reference address

Both a and b are equal in value

Both a and b are equal in value and type

There is no such statement

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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)

false.toString()

String(false)

String newvariable=”false”

Both false.toString() and String(false)