JavaScript Values Mocktest

The value "Hello, World!" is a string in JavaScript. Strings are used to represent sequences of characters, and they are enclosed within single ('') or double ("") quotes. Therefore, option B is correct.

The string "true" represents a Boolean value of true in JavaScript. Boolean values can be either true or false, and they are not enclosed in quotes when used as literals. Options B, C, and D represent strings but do not represent Boolean values. Therefore, option A is correct for representing a Boolean value.

The expression (5 > 3) evaluates to true in JavaScript because 5 is greater than 3. In JavaScript, comparison operators like '>' return a Boolean value of true or false based on the comparison result. Therefore, option A is correct for the evaluation of the expression (5 > 3).

The value of the expression (10 * 3) / 2 is 20 in JavaScript. JavaScript follows the order of operations (PEMDAS/BODMAS), where multiplication and division are performed before addition and subtraction. Therefore, option C is correct for the value of the expression (10 * 3) / 2.

The value null represents a null value in JavaScript. Null is a primitive value that represents the intentional absence of any object value. Options A and B represent the string "undefined" and the string "null" respectively, which are not the same as the actual null value. Therefore, option C is correct for representing a null value.

In JavaScript, when a number is added to a string using the + operator, the number is converted to a string and concatenated with the string. Therefore, the result of the expression 10 + "5" is "105". Option D is correct for the result of the expression.

The value undefined represents an undefined value in JavaScript. Undefined is a primitive value that signifies a variable that has been declared but not assigned a value. Options A and D represent the strings "undefined" and "null" respectively, which are not the actual undefined value. Therefore, option C is correct for representing an undefined value.

When two strings are concatenated using the + operator in JavaScript, they are joined together to form a single string. Therefore, the value of the expression "Hello" + "World" is "HelloWorld". Option A is correct for the value of the expression.

The value true represents a Boolean data type in JavaScript. Booleans can have two values: true or false, and they are often used in conditional expressions and logical operations. Therefore, option C is correct for the data type represented by the value true.

In JavaScript, when a number is added to a string using the + operator, the number is converted to a string and concatenated with the string. Therefore, the value of the expression 5 + 5 + "10" is "510". Option B is correct for the value of the expression.