Ruby Operator MCQ
11. Which operator is used to find exponent in ruby?
A. *
B. **
C. ^
D. %
View Answer
Ans : B
Explanation: ** is used find exponent in ruby.
12. equal? Operator is used for?
A. Used to test equality within a when clause of a case statement.
B. if the receiver and argument have both the same type and equal values.
C. if the receiver and argument have the same object id.
D. All of the above
View Answer
Ans : C
Explanation: equal? return True if the receiver and argument have the same object id.
13. Guess the operator : If Condition is true ? Then value X : Otherwise value Y?
A. Range Operators
B. Ternary Operator
C. Parallel Operator
D. Arithmetic operator
View Answer
Ans : B
Explanation: first evaluates an expression for a true or false value and then Ternary Operator executes one of the two given statements depending upon the result of the evaluation
14. Which operator is used to check variable and method are defined or not?
A. define
B. define?
C. defined?
D. defined
View Answer
Ans : C
Explanation: defined? is a special operator that takes the form of a method call to determine whether or not the passed expression is defined.
15. Among the following which operator has lowest Precedence?
A. .
B. ^
C. ...
D. >>
View Answer
Ans : C
Explanation: ... has lowest precedence.
16. What will be the output of the given code?
num=4<<2
puts num
A. 4
B. 8
C. 16
D. 32
View Answer
Ans : C
Explanation: left operands value is moved left by the number of bits specified by the right operand. So after shifting 0011 by 2 times the output will be 16.
17. What will be the output of the given code?
num=(10<11)||(11===11)? (11===11.0): 0
puts num
A. TRUE
B. FALSE
C. 1
D. 0
View Answer
Ans : B
Explanation: First check 10<11 it return true then no need to check 11===11 , condition becomes true now go to next statement 11===11.0 and it will return true.
18. What will be the output of the given code?
boolean_var = false || -20 > -18
puts boolean_var
A. TRUE
B. FALSE
C. Type Error
D. Syntax Error
View Answer
Ans : B
Explanation: -20 is not greater than -18 hence the output will be false || false which is false.
19. What will be the output of the given code?
boolean_var = !true || (true || 36 != 6**2)
puts boolean_var
A. TRUE
B. FALSE
C. Error
D. None of the above
View Answer
Ans : A
Explanation: 36 != 6**2 is false and true || false is true but true || !true is true hence the overall expression will evaluate to true.
20. What will the following expression evaluate to?
!true && !false
A. TRUE
B. FALSE
C. Syntax Error
D. None of the above
View Answer
Ans : B
Explanation: Boolean operator && evaluates to true only when both the values are true.
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