Object Oriented Programming using C++ Questions and Answers – Single Level Inheritance

This set of Object Oriented Programming (OOPs) using C++ Multiple Choice Questions & Answers (MCQs) focuses on “Single Level Inheritance”.

1. Which among the following defines single level inheritance?
a) One base class derives another class
b) One derived class inherits from one base class
c) One base class inherits from one derived class
d) One derived class derives from another derived class
View Answer

2. If class A and class B are derived from class C and class D, then ________________
a) Those are 2 pairs of single inheritance
b) That is multilevel inheritance
c) Those is enclosing class
d) Those are all independent classes
View Answer

3. If single inheritance is used, program will contain ________________
a) At least 2 classes
b) At most 2 classes
c) Exactly 2 classes
d) At most 4 classes
View Answer

4. Single level inheritance supports _____________ inheritance.
a) Runtime
b) Compile time
c) Multiple inheritance
d) Language independency
View Answer

5. Which method in the code below is single level inherited?

class A
{
	protected int a, b;
	public: void show()
	{ 
		cout<<a<<b;
	}
};
class B: public A
{
	public: void disp()
	{ 
		cout<<a++<<b++; 
	}
};
class C: private A, public B
{
	void avg()
	{ 
		cout<<(a+b)/2; 
	}
};

a) Class A
b) Class B
c) Class C
d) None
View Answer

6. If single level inheritance is used and an abstract class is created with some undefined functions, can its derived class also skip some definitions?
a) Yes, always possible
b) Yes, possible if only one undefined function
c) No, at least 2 undefined functions must be there
d) No, the derived class must implement those methods
View Answer

7. Which among the following is false for single level inheritance?
a) There can be more than 2 classes in program to implement single inheritance
b) There can be exactly 2 classes to implement single inheritance in a program
c) There can be more than 2 independent classes involved in single inheritance
d) The derived class must implement all the abstract method if single inheritance is used
View Answer

8. Which concept will result in derived class with more features (consider maximum 3 classes)?
a) Single inheritance
b) Multiple inheritance
c) Multilevel inheritance
d) Hierarchical inheritance
View Answer

9. Single level inheritance is safer than _____________
a) Multiple inheritance
b) Interfaces
c) Implementations
d) Extensions
View Answer

10. Which language doesn’t support single level inheritance?
a) Java
b) C++
c) Kotlin
d) All languages support it
View Answer

11. What is the output of the following program?

class A
{
	protected: int a,b;
	public: void disp()
	{ 
		cout<<a<<b; 
	}
};
class B:public A
{
	int x,y;
};

a) Garbage value
b) Compile time error
c) Runtime error
d) Runs but gives random values as output
View Answer

12. What is the output of the following program?

class A
{  
	float sal=40000;  
}  
class B extends A
{  
	int salBonus=10000;  
	public static void main(String args[])
	{  
		B p=new B();  
		System.out.println("B salary is:"+p.sal);  
		System.out.println("Bonus of B is:"+p.bonus);  
	}  
}

a)

B salary is: 4000.0
Bonus of B is: 10000

b)

B salary is 10000
Bonus of B is: 4000.0

c) Compile time error
d) Runtime error
View Answer

13. Single level inheritance will be best for___________
a) Inheriting a class which performs all the calculations
b) Inheriting a class which can print all the calculation results
c) Inheriting a class which can perform and print all calculations
d) Inheriting all the classes for different calculations
View Answer

14. Which constructor will be called first from the classes involved in single inheritance from object of derived class?
a) Base class constructor
b) Derived class constructor
c) Both class constructors at a time
d) Runtime error
View Answer

15. If base class contains 2 nested classes, will it be possible to implement single level inheritance?
a) Yes, always
b) Yes, only if derived class also have nested classes
c) No, it will use more than 2 classes which is wrong
d) No, never
View Answer

Sanfoundry Global Education & Learning Series – Object Oriented Programming (OOPs).

To practice all areas of Object Oriented Programming (OOPs) using C++, here is complete set of 1000+ Multiple Choice Questions and Answers.

If you find a mistake in question / option / answer, kindly take a screenshot and email to [email protected]