JavaScript Variables Mockest | JavaScript

11.

Which symbol is used for string concatenation in JavaScript?

A). + B). - C). * D). /

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12.

What will be the output of the following code: console.log('Hello ' + 'World');?

A). Hello World B). Hello + World C). Hello +World D). HelloWorld

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13.

What is the purpose of the NaN (Not a Number) value in JavaScript?

A). To represent a number that is not a valid JavaScript number B). To represent a zero value C). To represent an infinite value D). To represent an empty string

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14.

What will be the value of x after the following code executes: let x = '5' + 5;?

A). '55' B). 10 C). 5 D). '10'

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15.

Which method is used to convert a string to a number in JavaScript?

A). toString() B). parseInt() C). parseFloat() D). toNumber()

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16.

What will be the output of the following code: console.log(parseInt('10.5'));?

A). 10 B). 5 C). '10.5' D). NaN (Not a Number)

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17.

What is the purpose of using the === operator in JavaScript?

A). Strict equality comparison B). Loose equality comparison C). Assignment operator D). Addition operator

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18.

Which statement correctly assigns the value true to a boolean variable isLogged in JavaScript?

A). let isLogged = 'true'; B). let isLogged = true; C). let isLogged = 1; D). let isLogged = 0;

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