Which symbol is used for string concatenation in JavaScript?
A). +
B). -
C). *
D). /
Which keyword is used to declare a constant variable in JavaScript?
A). const
B). let
C). var
D). constant
What will be the value of x after the following code executes: let x = 10; x += 5;?
A). 15
B). 5
C). 10
D). undefined
Which variable declaration is appropriate if you want a variable to hold a constant value throughout the program execution?
A). let
B). var
C). const
D). constant
What will be the value of x after the following code executes: let x = '5' + 5;?
A). '55'
B). 10
C). 5
D). '10'
What is the purpose of using the === operator in JavaScript?
A). Strict equality comparison
B). Loose equality comparison
C). Assignment operator
D). Addition operator
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)
What is the value of x after the following code executes: let x = 5; x *= 2; x /= 3;?
A). 04-Oct
B). 6666666666667
C). 5
D). undefined
What happens if you declare a variable without initializing it in JavaScript?
A). It will throw a syntax error
B). It will assign the variable a value of undefined
C). It will automatically assign a value to the variable
D). It will assign the variable a value of null
Which method is used to convert a string to a number in JavaScript?
A). toString()
B). parseInt()
C). parseFloat()
D). toNumber()