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In C++, what is the default return type if not specified in a function?
A. int
B. void
C. double
D. char
Answer: int
In Python, what is the output of `3 * ‘abc’`?
A. abcabcabc
B. 9
C. SyntaxError
D. TypeError
Answer: abcabcabc
Which method is used to convert a Python list into a set?
A. set()
B. list()
C. convert()
D. setify()
Answer: set()
Which of the following is not a valid visibility modifier in Java?
A. private
B. protected
C. public
D. internal
Answer: internal
Which of the following is used to catch an exception in Python?
A. try-except
B. try-catch
C. try-finally
D. catch-finally
Answer: try-except
In JavaScript, what does the ‘this’ keyword refer to inside a method?
A. The global object
B. The current object
C. The parent object
D. None of the above
Answer: The current object
In Ruby, which keyword is used to define a class?
A. class
B. def
C. create
D. construct
Answer: class
What is the time complexity of binary search?
A. O(n)
B. O(log n)
C. O(n^2)
D. O(1)
Answer: O(log n)
Which of the following is a valid declaration of an array in C++?
A. int arr[] = {1, 2, 3};
B. int[] arr = {1, 2, 3};
C. arr int[] = {1, 2, 3};
D. array int arr = {1, 2, 3};
Answer: int arr[] = {1, 2, 3};