Futuresoft Placement Paper - Object-oriented programming (OOP) Questions

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1. Which of the following is the correct class of the object cout?

   A: iostream

   B: istream

   C: ostream

   D: ifstream

   Ans: C

2. Which of the following cannot be used with the keyword virtual?

   A: class

   B: member functions

   C: constructor

   D: destructor

   Ans: C

3. Which of the following problem causes an exception?

   A: Missing semicolon in statement in main().

   B: A problem in calling function

   C: A syntax error

   D: A run-time error

   Ans: D

4. Which one of the following options is correct about the statement given below? The compiler checks the type of reference in the object and not the type of object.

   A: Inheritance

   B: Polymorphism

   C: Abstraction

   D: Encapsulation

   Ans: B

5. What will be the output of the following program?

   #include <iostream.h>
   void main()
   {
     float x;
     x = (float)9/2;
     cout << x;
   }
       

   A: 4.5

   B: 4.0

   C: 4

   D: 5

   Ans: A

6. The term __________ means the ability to take many forms.

   A: Inheritance

   B: Polymorphism

   C: Member function

   D: Encapsulation

   Ans: B

7. Runtime polymorphism is achieved by

   A: Friend function

   B: Virtual function

   C: Operator overloading

   D: Function overloading

   Ans: B

8. Access to private data

   A: Restricted to methods of the same class

   B: Restricted to methods of other classes

   C: Available to methods of the same class and other classes

   D: Not an issue because the program will not compile

   Ans: B

9. Additional information sent when an exception is thrown may be placed in

   A: The throw keyword

   B: The function that caused the error

   C: The catch block

   D: An object of the exception class

   Ans: C

10. A static data member is given a value

    A: Within the class definition

    B: Outside the class definition

    C: When the program is executed

    D: Never

    Ans: D

11. In a class specifier, data or function designated private are accessible

    A: To any function in the program

    B: Only if you know the password

    C: To member functions of that class

    D: Only to public members of the class

    Ans: C

12. Which of the statements are true?

    I. Function overloading is done at compile time.

    II. Protected members are accessible to the member of derived class.

    III. A derived class inherits constructors and destructors.

    IV. A friend function can be called like a normal function.

    V. Nested class is a derived class.

    A: I, II, III

    B: II, III, V

    C: III, IV, V

    D: I, II, IV

    Ans: D