OOPS Interview Questions and Answers

OOPS Interview Questions

1. Which is not a type of constructor?
a) Friend constructor
b) Copy constructor
c). Default constructor
d) Parameterized constructor
Ans: A

2. Which is not a member of class?
a) Static function
b) Const function
c) Virtual function
d) Friend function
Ans: D

3. How many instances of abstract class can be created?
a) 1
b) 5
c) 13
d) 0
Ans: D

4. What does a new operator do?
a) Assigns memory only for an object or array
b) Allocates memory for an object/array and returns a pointer
c) Declare any new thing in a program
d) None of the above
Ans: b

5. Choose the proper syntax of dynamic_cast?
a) dynamic_cast(object)
b) dynamic_cast new (object)
c) Both a and b
d) None of the above
Ans: a

6. Define upcasting
a) Casting subtype to supertype
b) Casting supertype to subtype
c) Casting subtype to any other type
d) None of the above
Ans: a

7. Choose the correct statement?
a) Constructors overloading can be done with multiple names
b) Constructors name and class name must be the same
c) Constructors overloading can be done with an argument
d) Constructors overloading can be done with multiple return types
Ans: b

8. Which pointer denotes the object calling the member function?
a) Null pointer
b) This pointer
c) Zero pointer
d) None of the above
Ans: b

9. Pointers are not allowed in which language?
a) C++
b) C
c) Pascal
d) Java
Ans: d

10 The object can be passed by
a) Reference or value
b) value
c) reference
d) None of the above
Ans: a

11. Which concept refers to exposing only important information to clients?
a) Encapsulation
b) Data Hiding
c) Data binding
d) None of the above
Ans: b

12. What is cout?
a) Object
b) Function
c) Macro
d) Operator
Ans: a

13. C++ supports how many types of polymorphisms?
a) 2
b) 4
c) 9
d) 12
Ans: a

14. Choose the abstract data type
a) string
b) class
c) double
d) none of the above
Ans: b

15. A constructor is called during?
a) Declaration of an object
b) Declaration of a class
c) Use of a class
d) Use of an object
Ans: a

16. What describes overloading of functions?
a) Transient polymorphism
b) Pseudo polymorphism
c) Virtual polymorphism
d) Ad-hoc polymorphism
Ans: D

17. C++ has adapted which approach?
a) Right-left
b) Left-right
c) Bottom-up
d) Top-down
Ans: C

18. Choose the function performed by a constructor
a) Initialize objects
b) Construct a new function
c) Construct a new class
d) None of the above
Ans: a

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