Object Oriented Programming interview questions part 50
Object Oriented Programming interview questions part 50
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Total Questions: 20
1. Which specifier applies only to the constructors?
Correct Answer is : Explicit
2. Which among the following is true?
Correct Answer is : Default constructor can be called explicitly
3. Which type of constructor can’t have a return type?
Correct Answer is : Constructors don’t have a return type
4. Why do we use static constructors?
Correct Answer is : To initialize the static members of class
5. When and how many times a static constructor is called?
Correct Answer is : Called at first time when an object is created and only one time
6. Which among the following is true for static constructor?
Correct Answer is : Static constructors can’t be parameterized constructors
7. Within a class, only one static constructor can be created.
Correct Answer is : TRUE
8. Default constructor initializes all data members as:
Correct Answer is : All numeric member with zero and strings to null
9. When is the static constructor called?
Correct Answer is : Before first instance is created
10. If constructors of a class are defined in private access, then:
Correct Answer is : The class can’t be inherited
11. Which among the following is correct, based on the given code below: class student { int marks; public : student() { cout<<”New student details can be added now”; } }; student s1;
Correct Answer is : This program works fine
12. How many types of inheritance are possible in C++?
Correct Answer is : 5
13. Which among the following is true?
Correct Answer is : Java doesn’t support multiple inheritance
14. Which type of inheritance is illustrated by the following code? class student{ public: int marks; }; class topper: public student { public: char grade; }; class average{ public: int makrs_needed; }; class section: public average{ public: char name[10]; }; class overall: public average{ public: int students; };
Correct Answer is : Hierarchical
15. Which among the following best describes multiple inheritance?
Correct Answer is : More than one class being parent of single child
16. How many types of inheritance can be used at a time in single program?
Correct Answer is : Any type, any number of times
17. Which type of inheritance results in diamond problem?
Correct Answer is : Hybrid
18. If 6 classes uses single level inheritance with pair classes (3 pairs), which inheritance will this be called?
Correct Answer is : Single
19. Which among the following is correct for the following code? class A { public : class B { public : B(int i): data(i) { } int data; } }; class C: public A { class D:public A::B{ }; };
Correct Answer is : Single level inheritance is used, with both enclosing and nested classes
20. Which among the following is false?
Correct Answer is : Hybrid inheritance always contains multiple inheritance
