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JavaScript Numbers
Question 1
What is the result of typeof 123 in JavaScript?
- A
number
- B
integer
- C
string
- D
undefined
Question 2
Which of the following methods is used to convert a string to a number in JavaScript?
- A
parseInt()
- B
parseString()
- C
toNumber()
- D
convertToNumber()
Question 3
Which of the following methods is used to check if a number is an integer?
- A
isInt()
- B
isInteger()
- C
isNumber()
- D
checkInteger()
Question 4
What will be the result of Math.max(10, 20, 30)?
- A
10
- B
20
- C
30
- D
NaN
Question 5
What is the output of 0.1 + 0.2 === 0.3 in JavaScript?
- A
true
- B
false
- C
NaN
- D
undefined
Question 6
Which operator is used to get the remainder of a division operation?
- A
*
- B
/
- C
%
- D
//
Question 7
What is the output of Math.floor(3.9) in JavaScript?
- A
3.9
- B
3
- C
4
- D
NaN
Question 8
Which of the following methods can be used to convert a number into a string in JavaScript?
- A
.toString()
- B
.toNumber()
- C
.convert()
- D
.toInt()
Question 9
What is the result of Number('123')?
- A
123
- B
NaN
- C
'123'
- D
undefined
Question 10
Which of the following methods is used to check if a value is a valid number in JavaScript?
- A
isValidNumber()
- B
isNaN()
- C
checkNumber()
- D
isNum()
There are 10 questions to complete.