Question 1

If a class leaves one method in an interface undeclared,the class is implicitly declared by C# as an abstract class.

Accepted Answer

A) True 
 B)False  False

Question 2

Polymorphism helps promote software extensibility.

Accepted Answer

A) True 
 B)False  True

Question 3

Which is used to specify that a class will be implementing an interface

Accepted Answer

A)  using 
B)  : 
C)  implements 
D)  extends 
A)  using 
B)  : 
C)  implements 
D)  extends B

Question 4

Polymorphism enables objects of different classes that are related by a class hierarchy to be processed generically.

Accepted Answer

A) True 
 B)False

Question 5

Declaring an interface protected allows for extra security precautions.

Accepted Answer

A) True 
 B)False

Question 6

The abstract keyword has the same effect as the virtual keyword.

Accepted Answer

A) True 
 B)False

Question 7

If the base class contains only abstract method declarations,the base class is used for:

Accepted Answer

A)  implementation inheritance. 
B)  interface inheritance. 
C)  Both. 
D)  Neither. 
A)  implementation inheritance. 
B)  interface inheritance. 
C)  Both. 
D)  Neither.

Question 8

Abstract classes can provide data and services for objects.

Accepted Answer

A) True 
 B)False

Question 9

Polymorphism allows for specifics to be dealt with during:

Accepted Answer

A) execution 
B) compilation 
C) programming 
D) debugging 
A) execution 
B) compilation 
C) programming 
D) debugging

Question 10

Attempting to instantiate an object of an abstract class is a logic error.

Accepted Answer

A) True 
 B)False

Question 11

Polymorphism allows classes to be added with little or no modifications to the generic portion of a program.

Accepted Answer

A) True 
 B)False

Question 12

All of the following methods are implicitly sealed except:

Accepted Answer

A)  a method in an abstract class. 
B)  a private method. 
C)  a method declared in a sealed class. 
D)  static method. 
A)  a method in an abstract class. 
B)  a private method. 
C)  a method declared in a sealed class. 
D)  static method.

Question 13

The major drawback to polymorphically designed programs is that they do not take into account the future addition or deletion of classes.

Accepted Answer

A) True 
 B)False

Question 14

All static and private methods are implicitly sealed.

Accepted Answer

A) True 
 B)False

Question 15

Polymorphism allows you to command a wide variety of objects even if you do not know the objects' types.

Accepted Answer

A) True 
 B)False

Question 16

The abstract methods and properties of a class do not provide an implementation.

Accepted Answer

A) True 
 B)False

Question 17

Which declaration declares abstract method method1 in abstract class Class1 (method1 returns an int and takes no arguments)

Accepted Answer

A)  public int method1(); 
B)  public int abstract method1(); 
C)  public abstract int method1(); 
D)  public int nonfinal method1(); 
A)  public int method1(); 
B)  public int abstract method1(); 
C)  public abstract int method1(); 
D)  public int nonfinal method1();

Question 18

A convention of the UML is to denote the name of an abstract class in:

Accepted Answer

A)  bold 
B)  italics 
C)  a diamond 
D)  there is no convention of the UML to denote abstract classes-they are listed just as any other class 
A)  bold 
B)  italics 
C)  a diamond 
D)  there is no convention of the UML to denote abstract classes-they are listed just as any other class

Question 19

Every object in C# knows its own class and can access this information through method

Accepted Answer

A)  GetType() 
B)  GetInformation() 
C)  ObjectClass() 
D)  ObjectInformation() 
A)  GetType() 
B)  GetInformation() 
C)  ObjectClass() 
D)  ObjectInformation()

Question 20

Interfaces can have methods.

Accepted Answer

A)  0 
B)  1 
C)  2 
D)  any number of 
A)  0 
B)  1 
C)  2 
D)  any number of

Exam 12: Object-Oriented Programming: Polymorphism

If a class leaves one method in an interface undeclared,the class is implicitly declared by C# as an abstract class.

Polymorphism helps promote software extensibility.

Which is used to specify that a class will be implementing an interface

Polymorphism enables objects of different classes that are related by a class hierarchy to be processed generically.

Declaring an interface protected allows for extra security precautions.

The abstract keyword has the same effect as the virtual keyword.

If the base class contains only abstract method declarations,the base class is used for:

Abstract classes can provide data and services for objects.

Polymorphism allows for specifics to be dealt with during:

Attempting to instantiate an object of an abstract class is a logic error.

Polymorphism allows classes to be added with little or no modifications to the generic portion of a program.

All of the following methods are implicitly sealed except:

The major drawback to polymorphically designed programs is that they do not take into account the future addition or deletion of classes.

All static and private methods are implicitly sealed.

Polymorphism allows you to command a wide variety of objects even if you do not know the objects' types.

The abstract methods and properties of a class do not provide an implementation.

Which declaration declares abstract method method1 in abstract class Class1 (method1 returns an int and takes no arguments)

A convention of the UML is to denote the name of an abstract class in:

Every object in C# knows its own class and can access this information through method

Interfaces can have methods.

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