Javascript Expression And Operator MCQ

This section focuses on the "Javascript Expression And Operator" of the Javascript (JS). These Multiple Choice Questions (mcq) should be practiced to improve the Javascript skills required for various interviews (campus interview, walk-in interview, company interview), placement, entrance exam and other competitive examinations.

1. Which operator is known as the equality operator, which checks whether its two operators are "equal"?

A. =
B. ==
C. ===
D. &&

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2. Which operator is known as the strict equality operator, which checks whether its two operators are identical or not?

A. =
B. ==
C. ===
D. &&

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3. Which operator will return false if two value are equal?

A. !
B. !=
C. !==
D. All of the above

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4. When using comparative operators,if after object to primitive conversion, at least one operand is not a string, both operands are converted to?

A. String
B. Boolean
C. Number
D. Object

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5. If the operator value is null, then the unary operator returns the typeof _________.

A. undefined
B. object
C. boolean
D. string

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6. which operator evaluates its operands, then discards the value and returns undefined?

A. In
B. Comparison
C. Eval
D. Void

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7. If var A={B:3, C:5}, how to use the delete operator to delete one of the properties of an object.

A. delete
B. delete A
C. delete A.B
D. delete A[0]

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8. What will be the output if we compare "ten" and 10 with less then comparison operator("ten"<10)?

A. True
B. False
C. undefined
D. error

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9.  If an operator is NaN or converts to NaN, what wil comparison operator always returns ?

A. True
B. False
C. Undefined
D. NAN

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10. State whether the following statements are True or False for strict equality operator(= = =).
i) If the two values have different types they are equal.
ii) If both values are null or both values are undefined, they are equal.

A. True True
B. False False
C. True False
D. False True

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11. which operator outputs the remainder of an integer division?

A. Add
B. Subtraction
C. Modulus
D. Increment

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12. Which operator checks if the value of the left operand is greater than the value of the right operand?

A. Equal
B. Greater than
C. Less than
D. Greater than or Equal to

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13. Logical AND : If both the operands are non-zero, then the condition becomes true.

A. Yes
B. No
C. Can be yes or no
D. Can not say

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14. Which of the following statement is true about BitWise OR?

A. It performs a Boolean AND operation on each bit of its integer arguments
B. It is a unary operator and operates by reversing all the bits in the operand.
C. Both A and B
D. It performs a Boolean OR operation on each bit of its integer arguments.

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15. A __________ will be visible only within a function where it is defined.

A. global variables
B. local variable
C. Both A and B
D. None of the above

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