Test: Variables and Operators - 1 - Software Development MCQ

The "var" keyword is used to declare variables in JavaScript.

Variable names in JavaScript cannot start with a number.

When using the + operator with a string and a number, JavaScript performs string concatenation.

The "+=" operator adds the right operand to the left operand and assigns the result to the left operand.

"toUpperCase()" is a string method, not a number method.

JavaScript performs string concatenation when adding a string and a number.

The sum of x and y is calculated as 10 + 5, resulting in 15.

JavaScript tries to perform a numeric subtraction but encounters a string, resulting in "NaN" (Not a Number).

The modulus operator (%) returns the remainder of the division between x and y.

JavaScript performs floating-point division when dividing a number by another number.

The code first increments x by 1 (5 + 1 = 6) and then adds 2 to the updated value (6 + 2 = 8).

The "Math.pow()" function calculates the power of x raised to y.

The expression 3 - 1 evaluates to 2, and then x is multiplied by 2.

The modulus operator (%) returns the remainder of the division between x and y.

The code concatenates the strings "Hello" and "World" with a space in between.