Answer & Solution
Answer: Option B
Solution:
JavaScript performs implicit type conversion (coercion) when adding a number and a string, resulting in a string concatenation.
Q
What is the result of the expression 5 + '5' in JavaScript?
Related Questions on Average
What is the result of the expression true == 1 in JavaScript?
A). true
B). false
C). Error
D). 1
Which of the following is a valid way to represent the value null in JavaScript?
A). undefined
B). NULL
C). null
D). None of the above
Which symbol is used to represent a boolean value in JavaScript?
A). #
B). $
C). !
D). true/false
Which of the following is not a primitive value in JavaScript?
A). Number
B). Boolean
C). Object
D). String
What is the data type of the value NaN in JavaScript?
A). Number
B). String
C). Object
D). Undefined
What does the Symbol data type represent in JavaScript?
A). A unique identifier
B). A number
C). A boolean value
D). An object
What happens when you add two numbers using the + operator in JavaScript?
A). The numbers are concatenated
B). The numbers are multiplied
C). The numbers are added
D). An error occurs
What happens when you try to access a variable that has not been declared in JavaScript?
A). SyntaxError is thrown
B). ReferenceError is thrown
C). TypeError is thrown
D). Undefined
Which of the following statements about primitive values in JavaScript is true?
A). They are mutable
B). They are passed by reference
C). They are stored on the heap
D). They are immutable
Which primitive value represents absence of value or no value assigned?
A). undefined
B). null
C). 0
D). 'undefined'