Question 1

A class that inherits from another class is referred to as the derived class.

Accepted Answer

A) True 
 B)False

Question 2

Consider the classes below,declared in the same file:
Class A
{
Int a;
Public A()
{
A = 7;
}
}
Class B : A
{
Int b;
Public B()
{
B = 8;
}
}
Which of the statements below is false

Accepted Answer

A)  Both variables a and b are instance variables. 
B)  After the constructor for class B is executed, the variable a will have the value 7. 
C)  After the constructor for class B is executed, the variable b will have the value 8. 
D)  A reference to class A can be treated as a reference to class B. 
A)  Both variables a and b are instance variables. 
B)  After the constructor for class B is executed, the variable a will have the value 7. 
C)  After the constructor for class B is executed, the variable b will have the value 8. 
D)  A reference to class A can be treated as a reference to class B.

Question 3

Every class in C#,except __________,extends an existing class.

Accepted Answer

A)  Integer 
B)  object 
C)  String 
D)  Class 
A)  Integer 
B)  object 
C)  String 
D)  Class

Question 4

Which base class members are inherited by all derived classes of that base class

Accepted Answer

A)  private instance variables and methods 
B)  protected instance variables and methods 
C)  private constructors 
D)  protected constructors 
A)  private instance variables and methods 
B)  protected instance variables and methods 
C)  private constructors 
D)  protected constructors

Question 5

All classes in C# have object as either a direct or indirect base class.

Accepted Answer

A) True 
 B)False

Question 6

Derived classes provide the functionality and features inherited by base classes.

Accepted Answer

A) True 
 B)False

Question 7

Using protected instance variables can cause derived-class methods to be written to depend on base-class implementation.

Accepted Answer

A) True 
 B)False

Question 8

A class inherited from two or more levels up in the hierarchy is known as a

Accepted Answer

A)  indirect base class 
B)  direct base class 
C)  superclass 
D)  None of the above 
A)  indirect base class 
B)  direct base class 
C)  superclass 
D)  None of the above

Question 9

Which of the following statements is (are)true
A.We can use inheritance to customize existing software.
B.A base class specifies commonality.
C.A base class can be modified without modifying derived classes
D.A derived class can be modified without modifying its derived class.

Accepted Answer

A)  All of the above 
B)  None of the above 
C)  A, B and C 
D)  A, B and D 
A)  All of the above 
B)  None of the above 
C)  A, B and C 
D)  A, B and D

Question 10

When a derived-class member overrides a base-class member,the base-class member can be accessed from the derived-class by using the keyword

Accepted Answer

A)  base 
B)  top 
C)  super 
D)  None of the above 
A)  base 
B)  top 
C)  super 
D)  None of the above

Question 11

Members of a base class that are private are not inherited by derived classes.

Accepted Answer

A) True 
 B)False

Question 12

Which of the following pairs demonstrates the has-a relationship between the first and the second terms

Accepted Answer

A)  car, vehicle 
B)  house, window 
C)  teacher, person 
D)  None of the above 
A)  car, vehicle 
B)  house, window 
C)  teacher, person 
D)  None of the above

Question 13

Overriding a method differs from overloading a constructor because:

Accepted Answer

A)  For an overloaded constructor, the base class constructor will always be called first. 
B)  For an overridden constructor, the base class constructor will always be called first. 
C)  Overloaded methods have the same signature. 
D)  Overridden methods have the same signature. 
A)  For an overloaded constructor, the base class constructor will always be called first. 
B)  For an overridden constructor, the base class constructor will always be called first. 
C)  Overloaded methods have the same signature. 
D)  Overridden methods have the same signature.

Question 14

Which of the following pairs demonstrates the is-a relationship between the first and the second terms

Accepted Answer

A)  car, engine 
B)  book, table of contents 
C)  baseball, sport 
D)  None of the above 
A)  car, engine 
B)  book, table of contents 
C)  baseball, sport 
D)  None of the above

Question 15

An advantage of inheritance is that:

Accepted Answer

A)  all methods can be inherited 
B)  all instance variables can be uniformly accessed by base classes and derived classes 
C)  Objects of a derived class can be treated like objects of their base class 
D)  None of the above. 
A)  all methods can be inherited 
B)  all instance variables can be uniformly accessed by base classes and derived classes 
C)  Objects of a derived class can be treated like objects of their base class 
D)  None of the above.

Question 16

The protected members of a class may be accessed in their base class or any classes derived from that base class.

Accepted Answer

A) True 
 B)False

Question 17

When a derived class constructor calls its base class constructor,what happens if the base class's constructor does not assign a value to an instance variable

Accepted Answer

A)  a syntax error occurs 
B)  a compile-time error occurs 
C)  a run-time error occurs 
D)  the program compiles and runs correctly because the instance variables are initialized to their default values 
A)  a syntax error occurs 
B)  a compile-time error occurs 
C)  a run-time error occurs 
D)  the program compiles and runs correctly because the instance variables are initialized to their default values

Question 18

To avoid duplicating code (and possibly errors),use ________,rather than ________.

Accepted Answer

A)  inheritance, the "copy-and-paste" approach. 
B)  the "copy-and-past" approach, inheritance. 
C)  a class that explicitly extends object, a class that does not extend object. 
D)  a class that does not extend object, a class that explicitly extends object. 
A)  inheritance, the "copy-and-paste" approach. 
B)  the "copy-and-past" approach, inheritance. 
C)  a class that explicitly extends object, a class that does not extend object. 
D)  a class that does not extend object, a class that explicitly extends object.

Question 19

How can a derived class call a base class constructor

Accepted Answer

A) implicitly 
B)  explicitly 
C)  a and b 
D)  the derived class cannot call the base class constructor 
A) implicitly 
B)  explicitly 
C)  a and b 
D)  the derived class cannot call the base class constructor

Question 20

private fields of a base class can be accessed in a derived class

Accepted Answer

A)  by calling private methods declared in the base class 
B)  by calling public or protected methods declared in the base class 
C)  directly 
D)  All of the above 
A)  by calling private methods declared in the base class 
B)  by calling public or protected methods declared in the base class 
C)  directly 
D)  All of the above

Exam 11: Object-Oriented Programming: Inheritance

A class that inherits from another class is referred to as the derived class.

Consider the classes below,declared in the same file: Class A { Int a; Public A() { A = 7; } } Class B : A { Int b; Public B() { B = 8; } } Which of the statements below is false

Every class in C#,except __________,extends an existing class.

Which base class members are inherited by all derived classes of that base class

All classes in C# have object as either a direct or indirect base class.

Derived classes provide the functionality and features inherited by base classes.

Using protected instance variables can cause derived-class methods to be written to depend on base-class implementation.

A class inherited from two or more levels up in the hierarchy is known as a

Which of the following statements is (are)true A.We can use inheritance to customize existing software. B.A base class specifies commonality. C.A base class can be modified without modifying derived classes D.A derived class can be modified without modifying its derived class.

When a derived-class member overrides a base-class member,the base-class member can be accessed from the derived-class by using the keyword

Members of a base class that are private are not inherited by derived classes.

Which of the following pairs demonstrates the has-a relationship between the first and the second terms

Overriding a method differs from overloading a constructor because:

Which of the following pairs demonstrates the is-a relationship between the first and the second terms

An advantage of inheritance is that:

The protected members of a class may be accessed in their base class or any classes derived from that base class.

When a derived class constructor calls its base class constructor,what happens if the base class's constructor does not assign a value to an instance variable

To avoid duplicating code (and possibly errors),use ________,rather than ________.

How can a derived class call a base class constructor

private fields of a base class can be accessed in a derived class

Introduction to Computers, the Internet and Visual C#

Dive Into Visual Studio Community

Introduction to C# Apps

Introduction to Classes,Objects,Methods and Strings

Control Statements: Part 1

Control Statements: Part 2

Methods: a Deeper Look

Arrays;Introduction to Exception Handling

Introduction to Linq and Generic Collections

Classes and Objects: A Deeper Look

Object-Oriented Programming: Polymorphism

Exception Handling: A Deeper Look

GUI With Windows Forms: Part 1

GUI With Windows Forms: Part 2

Strings,Characters and Regular Expressions

Files and Streams

Searching and Sorting

Data Structures

Generics

Collections

Databases and LING

Asynchronous Programming With Async and Await

XML

GUI With Windows Presentation Foundation

Filters

To avoid duplicating code (and possibly errors),use ,rather than .