JavaScript Number Methods Mockest | JavaScript

11.

What is the result of parseInt("0xF", 16)?

A). 15 B). 0 C). NaN D). 16

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12.

What does Number.isInteger(123.45) return?

A). 1 B). 0 C). NaN D). undefined

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13.

What does parseFloat("12.34abc") return?

A). 12 B). 34 C). NaN D). undefined

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14.

What does (123.456).toFixed(1) return?

A). 4 B). 5 C). 45 D). 123

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15.

Which method can convert a number to a different base (e.g., hexadecimal)?

A). toString() B). parseInt() C). toFixed() D). valueOf()

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16.

What does Number.isNaN("123") return?

A). 1 B). 0 C). NaN D). undefined

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17.

What does parseInt("101", 2) return?

A). 5 B). 101 C). NaN D). 2

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18.

Which method would you use to check if a value is a finite number?

A). isNaN() B). isFinite() C). Number() D). toFixed()

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19.

What does Number("123abc") return?

A). 123 B). NaN C). 123abc D). undefined

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20.

What is the output of (255).toString(2)?

A). 255 B). 11111111 C). ff D). 10

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JavaScript Number Methods Mocktest

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