Object- Oriented Programming Interview Questions - 21

1. DataInputStream is derived from ______________________

A. StreamingInput

B. StreamedInput

C. StreameInput

D. StreamInput

Correct Answer is : StreamInput

2. Which attribute can be used to get the size of an array?

A. Size.Array

B. Array.Size

C. Array_name.length

D. length.Array_name

Correct Answer is : Array_name.length

3. Number class can’t manipulate ____________________

A. Integer values

B. Float values

C. Byte values

D. Character values

Correct Answer is : Character values

4. Which function should be used to exit from the program that is provided by System class?

A. exit(int);

B. gc();

C. terminate();

D. halt();

Correct Answer is : exit(int);

5. Which class contain runFinalization() method?

A. Finalize

B. System

C. Final

D. SystemFinal

Correct Answer is : System

6. What does load(String)::= function do, in System class?

A. Loads dynamic library for a path name

B. Loads all the dynamic libraries

C. Loads all the Number in string format

D. Loads the processor with calculations

Correct Answer is : Loads dynamic library for a path name

7. Which is not a System class variable?

A. err

B. out

C. in

D. put

Correct Answer is : put

8. Which package contains the utility classes?

A. java.lang

B. java.utility

C. java.util

D. java.io

Correct Answer is : java.util

9. Which among the following best describes the Inheritance?

A. Copying the code already written

B. Using the code already written once

C. Using already defined functions in programming language

D. Using the data and functions into derived segment

Correct Answer is : Using the data and functions into derived segment

10. How many basic types of inheritance are provided as OOP feature?

A. 4

B. 3

C. 2

D. 1

Correct Answer is : 4

11. Which among the following best defines single level inheritance?

A. A class inheriting a derived class

B. A class inheriting a base class

C. A class inheriting a nested class

D. A class which gets inherited by 2 classes

Correct Answer is : A class inheriting a base class

12. Which among the following is correct for multiple inheritance?

A. class student{public: int marks;}s; class stream{int total;}; class topper:public student, public stream{ };

B. class student{int marks;}; class stream{ }; class topper: public student{ };

C. class student{int marks;}; class stream:public student{ };

D. class student{ }; class stream{ }; class topper{ };

Correct Answer is : class student{public: int marks;}s; class stream{int total;}; class topper:public student, public stream{ };

13. Which among the following is correct for hierarchical inheritance?

A. Two base classes can be used to be derived into one single class

B. Two or more classes can be derived into one class

C. One base class can be derived into other two derived classes or more

D. One base class can be derived into only 2 classes

Correct Answer is : One base class can be derived into other two derived classes or more

14. Which is the correct syntax of inheritance?

A. class derived_classname : base_classname{ /*define class body*/ };

B. class base_classname : derived_classname{ /*define class body*/ };

C. class derived_classname : access base_classname{ /*define class body*/ };

D. class base_classname :access derived_classname{ /*define class body*/ };

Correct Answer is : class derived_classname : access base_classname{ /*define class body*/ };

15. Which type of inheritance leads to diamond problem?

A. Single level

B. Multi-level

C. Multiple

D. Hierarchical

Correct Answer is : Multiple

16. Which access type data gets derived as private member in derived class:

A. Private

B. Public

C. Protected

D. Protected and Private

Correct Answer is : Private

17. If a base class is inherited in protected access mode then which among the following is true?

A. Public and Protected members of base class becomes protected members of derived class

B. Only protected members become protected members of derived class

C. Private, Protected and Public all members of base, become private of derived class

D. Only private members of base, become private of derived class

Correct Answer is : Public and Protected members of base class becomes protected members of derived class

18. Members which are not intended to be inherited are declared as:

A. Public members

B. Protected members

C. Private members

D. Private or Protected members

Correct Answer is : Private members

19. While inheriting a class, if no access mode is specified, then which among the following is true? (in C++)

A. It gets inherited publicly by default

B. It gets inherited protected by default

C. It gets inherited privately by default

D. It is not possible

Correct Answer is : It gets inherited privately by default

20. If a derived class object is created, which constructor is called first?

A. Base class constructor

B. Derived class constructor

C. Depends on how we call the object

D. Not possible

Correct Answer is : Base class constructor

Object Oriented Programming interview questions part 21

Object Oriented Programming interview questions part 21

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Total Questions: 20