CISCE Board - ICSE Class 9

Java Programming Foundation question bank (Computer Applications)

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Q1.

Constructors & Overloading: In 'Object-Oriented Programming (OOP) Principles: Encapsulation, Inheritance, Polymorphism', what distinguishes a constructor from a method?

(A)
Same name as the class, no return type (not even void), automatically invoked upon object instantiation (Object-Oriented Programming (OOP) Principles: Encapsulation, Inheritance, Polymorphism)
(B)
Requires an int return type
(C)
Must be declared private always
(D)
None of these
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Q2.

Arrays (Sorting & Searching): In 'Object-Oriented Programming (OOP) Principles: Encapsulation, Inheritance, Polymorphism', what is the best-case time complexity of Binary Search on a sorted array?

(A)
$O(1)$ when key is at the midpoint, and worst-case $O(\log n)$ (Object-Oriented Programming (OOP) Principles: Encapsulation, Inheritance, Polymorphism)
(B)
$O(n^2)$
(C)
$O(n)$ always
(D)
None of these
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