Free Test Constructors and destr... – C++ Lan...

Q1: When is the base class constructor called in inheritance?

A. Before derived class constructor B. After derived class constructor C. Together with derived class constructor D. Base class constructor is not called automatically

Q2: How many constructors are called when an object of derived class is created?

A. Base and derived class constructors B. Only base class constructor C. Only derived class constructor D. No constructors called

Q3: In what order are destructors called in inheritance?

A. Derived class destructor first, then base class destructor B. Base class destructor first, then derived class destructor C. Together simultaneously D. Destructors are not called automatically

Q4: Can a derived class constructor call a specific base class constructor?

A. Yes, using initializer list B. No, base constructor is called automatically C. Only default base constructor is called D. By defining a friend function

Q5: What happens if base class constructor has parameters?

A. Derived class must explicitly call it B. Derived class constructor ignores it C. Derived class cannot be created D. Default constructor is called

Q6: If base class has no default constructor, what must derived class do?

A. Call base constructor explicitly B. No special action needed C. Define friend function D. Use virtual constructor

Q7: Are destructors inherited in C++?

A. No, destructors are not inherited B. Yes, destructors are inherited C. Only virtual destructors are inherited D. Only base destructor is used

Q8: What is the role of a virtual destructor in base class?

A. Ensures derived class destructor is called B. Prevents base class destructor call C. Disables inheritance D. Changes access specifiers

Q9: Can derived class constructor call multiple base class constructors in multiple inheritance?

A. Yes, it must initialize all bases B. No, only one base constructor is called C. Base constructors are called automatically D. Using virtual inheritance only

Q10: What happens if derived class destructor is not virtual?

A. Base class destructor called only B. Derived destructor called C. Both called anyway D. Destructor is ignored

Q11: Can constructors be virtual in C++?

A. No, constructors cannot be virtual B. Yes, constructors can be virtual C. Only base constructors can be virtual D. Only derived constructors can be virtual

Q12: What is constructor chaining?

A. Calling base constructors before derived constructor B. Calling multiple derived constructors C. Calling destructor automatically D. Calling friend functions

Q13: In inheritance, which constructor runs first?

A. Base class constructor B. Derived class constructor C. Friend function D. Destructor

Q14: If derived constructor does not initialize base class, which constructor is called?

A. Base class default constructor B. Base class parameterized constructor C. Derived constructor only D. No constructor

Q15: Can a destructor be pure virtual?

A. Yes, to make class abstract B. No, destructors cannot be virtual C. Only base destructor can be pure virtual D. Only derived destructor can be pure virtual

Q16: Why must pure virtual destructors have a definition?

A. Because destructors are called in destruction chain B. Because virtual destructors cannot be pure C. Because pure virtual functions cannot have a body D. Because derived classes ignore them

Q17: What is the order of constructor calls in multiple inheritance?

A. Base classes constructors in declaration order, then derived B. Derived then base constructors C. Random order D. Friend functions

Q18: Is it possible to skip base class constructor call in derived class?

A. No, base constructor is always called B. Yes, by not calling it explicitly C. Yes, by using friend function D. Only with virtual inheritance

Q19: What happens if base class destructor is non-virtual and deleting derived object via base pointer?

A. Derived destructor is not called B. Derived destructor is called C. Both destructors ignored D. Only base destructor called in derived class

Q20: How to explicitly call base class destructor?

A. Not normally possible; destructors are called automatically B. By using base class destructor syntax C. By friend function D. By using virtual function

Quiz for Constructors and destructors in inheritance