Question 1

Only the first constructor for a class is defined without a return value.Subsequent constructors have the return type void.

Accepted Answer

A) True 
 B)False

Question 2

Instance variables declared readonly do not or cannot:

Accepted Answer

A)  use the principle of least privilege 
B)  be initialized 
C)  be modified once the object is constructed 
D)  cause syntax errors if used as a left-hand value

Question 3

Programmers should not take into consideration that their code will be modified.

Accepted Answer

A) True 
 B)False

Question 4

The data components of a class are called instance variables.

Accepted Answer

A) True 
 B)False

Question 5

Which statement is false

Accepted Answer

A)  The compiler always creates a default constructor for a class. 
B)  If a class has constructors, but none of the public constructors are parameterless, and a program attempts to call a parameterless constructor to initialize an object of the class, a compilation error occurs. 
C)  A constructor can be called with no arguments only if the class does not have any constructors or if the class has a public parameterless constructor. 
D)  Parameterless constructors do not have any arguments.

Question 6

Composition:

Accepted Answer

A)  Is a form of software reuse. 
B)  Is using an object reference as a class member. 
C)  Is a good design practice. 
D)  All of the above.

Question 7

Keyword is used for constants whose values cannot be determined at compile time.

Accepted Answer

A)  const 
B)  readonly 
C)  static 
D)  None of the above.

Question 8

An object of a class that has a reference to another object of the same class may access all the private data and methods of that class.

Accepted Answer

A) True 
 B)False

Question 9

A destructor has the same name as the class and its constructor.

Accepted Answer

A) True 
 B)False

Question 10

Which of the following describes a static variable

Accepted Answer

A)  a variable with one copy shared by all class objects 
B)  a variable whose value may not be changed 
C)  all of the above 
D)  None of the above.

Question 11

The purpose of utility methods is to support the operation of a class' other methods.

Accepted Answer

A) True 
 B)False

Question 12

A static variable represents class-wide information.

Accepted Answer

A) True 
 B)False

Question 13

At least one argument of an operator overload method must be a reference to an object of the class in which the operator is overloaded.

Accepted Answer

A) True 
 B)False

Question 14

Objects can hide their implementation from other objects.

Accepted Answer

A) True 
 B)False

Question 15

Only certain objects have a this reference.

Accepted Answer

A) True 
 B)False

Question 16

Every class inherits directly or indirectly from class _________.

Accepted Answer

A)  Inheritor 
B)  Base 
C)  Super 
D)  object

Question 17

A program contains a separate copy of a static variable for each object that's instantiated.

Accepted Answer

A) True 
 B)False

Question 18

Attempting to modify a readonly instance variable after it's initialized is a fatal execution-time error.

Accepted Answer

A) True 
 B)False

Question 19

Operator overloading is the process of:

Accepted Answer

A)  enabling C#'s operators to work with class objects 
B)  using operators to create new classes 
C)  using operators to specify which versions of overloaded methods to use 
D)  None of the above.

Question 20

A can be defined in a class to perform termination housekeeping on an object before the garbage collector reclaims the object's memory.

Accepted Answer

A)  destructor 
B)  property 
C)  garbage collector 
D)  None of the above.

Exam 10: Classes and Objects: A Deeper Look

Only the first constructor for a class is defined without a return value.Subsequent constructors have the return type void.

Instance variables declared readonly do not or cannot:

Programmers should not take into consideration that their code will be modified.

The data components of a class are called instance variables.

Which statement is false

Composition:

Keyword is used for constants whose values cannot be determined at compile time.

An object of a class that has a reference to another object of the same class may access all the private data and methods of that class.

A destructor has the same name as the class and its constructor.

Which of the following describes a static variable

The purpose of utility methods is to support the operation of a class' other methods.

A static variable represents class-wide information.

At least one argument of an operator overload method must be a reference to an object of the class in which the operator is overloaded.

Objects can hide their implementation from other objects.

Only certain objects have a this reference.

Every class inherits directly or indirectly from class _________.

A program contains a separate copy of a static variable for each object that's instantiated.

Attempting to modify a readonly instance variable after it's initialized is a fatal execution-time error.

Operator overloading is the process of:

A can be defined in a class to perform termination housekeeping on an object before the garbage collector reclaims the object's memory.