Answer & Solution
Answer: Option C
Solution:
The data type of the value undefined in JavaScript is undefined, representing an undefined value.
Q
What is the data type of the value undefined in JavaScript?
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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
What is a primitive value in JavaScript?
A). A complex data structure
B). A basic data type
C). A function
D). An array
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A). undefined
B). null
C). 0
D). 'undefined'
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
What is the default value of a variable in JavaScript if it is not initialized?
A). null
B). undefined
C). 0
D). 'undefined'
What is the result of the expression undefined + null in JavaScript?
A). undefined
B). null
C). 0
D). Error
What is the result of the expression true + false in JavaScript?
A). true
B). false
C). 1
D). 0
What is the result of the expression 5 + '5' in JavaScript?
A). 10
B). '55'
C). '10'
D). Error
Which of the following is not a primitive value in JavaScript?
A). Number
B). Boolean
C). Object
D). String