Question 1

In C#, all exceptions are objects that are members of the ____ class or one of its derived classes.
A) ApplicationException
B) Exception
C) SystemException
D) RuntimeException

Accepted Answer

All exceptions in C# are instances of the Exception class or one of its derived classes. While exceptions can be created from the ApplicationException or SystemException classes, it is recommended to use the Exception class as the base class for all custom exceptions. The RuntimeException class is not a valid class in C#.

Question 2

The ____ methods are used to convert string data to another data type, such as int , double , or bool , without fear of generating an exception.
A) TryData()
B) TryFromString()
C) TryParse()
D) TryConvert()

Accepted Answer

The TryParse() methods are used to convert string data to another data type without generating an exception. They return a boolean value indicating whether the conversion was successful or not. If the conversion was successful, the parsed value is stored in an output variable.

Question 3

Typically, you use the ____ block to perform clean-up tasks that must occur, regardless of whether any errors occurred or were caught.
A) default
B) always
C) execute
D) finally

Accepted Answer

The finally block is used to perform clean-up tasks that must occur regardless of whether any errors occurred or were caught. This block is executed after the try and catch blocks, even if an exception occurs, making it a useful tool for managing resources such as files or database connections.

Question 4

Errors you discover when compiling a program are considered to be exceptions.

Accepted Answer

Errors found during compilation are not exceptions, but rather compile-time errors that prevent the program from being successfully compiled. Exceptions are runtime errors that occur during program execution.

Question 5

When you write a block of code in which something can go wrong, you can place the code in a(n) ____ block.
A) try
B) catch
C) finally
D) exception

Accepted Answer

A try block is used to handle exceptions.

Question 6

The creators of C# define an infrequent event in code as one that happens in less than ____ percent of all program executions.
A) 10
B) 25
C) 30
D) 35

Accepted Answer

The answer of The creators of C# define an infrequent...

Question 7

You can terminate an application with the ____ method.
A) Environment.Exit()
B) Environment.Bye()
C) Environment.Quit()
D) Environment.Terminate()

Accepted Answer

The Environment.Exit() method terminates the currently running application immediately. It allows the application to exit with any error messages it may have encountered during its execution. Therefore, option A is the correct choice.

Question 8

An exception of the ____ class is thrown when an ongoing operation is aborted by the user.
A) System.InvalidOperationException
B) System.ArithmeticException
C) System.Data.OperationAbortedException
D) System.InvalidCastException

Accepted Answer

The System.Data.OperationAbortedException is specifically designed to be thrown when an ongoing database operation is aborted by the user. It is not appropriate to use System.InvalidOperationException or System.InvalidCastException, as these exceptions are not specific enough for this scenario. System.ArithmeticException is completely unrelated and is thrown when there is an error during an arithmetic operation.

Question 9

An exception of the ____ class is thrown when an attempt is made to store an element of the wrong type within an array.
A) System.ArrayTypeMismatchException
B) System.ArithmeticException
C) System.FormatException
D) System.InvalidCastException

Accepted Answer

The System.ArrayTypeMismatchException class is specifically designed to handle situations where an attempt is made to store an element of the wrong type within an array. The other exception classes listed are not directly related to this scenario.

Question 10

____ blocks contain statements that can never execute under any circumstances because the program logic "can't get there."
A) Default
B) catch
C) finally
D) Unreachable

Accepted Answer

Unreachable blocks are those that contain statements that can never be executed due to unreachable code. This could be due to conditional statements that always evaluate to false or loops that never execute. Default, catch, and finally blocks are not necessarily unreachable and may execute depending on program logic.

Question 11

The Exception class contains a read-only property named ____ that contains useful information about an Exception object.
A) StackTrace
B) Message
C) toString
D) ThrownText

Accepted Answer

The Message property in the Exception class contains a string that describes the current exception. It often provides useful information about what caused the exception to be thrown.

Question 12

C# has more than 100 defined Exception subclasses.

Accepted Answer

C# has more than 100 defined Exception subclasses.

Question 13

You can place any number of statements in a try block, including those you know will never throw an exception.

Accepted Answer

This is true. You can put any statement in a try block, even those that are unlikely to throw an exception.

Question 14

Like all other classes in the C# programming language, the Exception class is a descendant of the ____ class.
A) System
B) Application
C) CLR
D) Object

Accepted Answer

The Exception class is a descendant of the Object class, which is the root class of all classes in the C# programming language. Therefore, the correct answer is D.

Question 15

You can deliberately generate a SystemException by forcing a program to contain an error.

Accepted Answer

Deliberately generating a SystemException involves intentionally creating an error in a program to trigger the exception.

Question 16

The ____ block is used frequently with file input and output to ensure that open files are closed.
A) execute
B) always
C) finally
D) default

Accepted Answer

The "finally" block in Python is used to execute a block of code regardless of whether an exception is thrown or not. This is helpful when working with file input and output because it ensures that open files are closed properly, even if an exception is thrown while the file is being manipulated. Therefore, choice C is the best option for the given question.

Question 17

The Exception class overrides ____ to provide a descriptive error message so a user can receive precise information about the nature of any Exception that is thrown.
A) Message()
B) StackTrace()
C) ToString()
D) ThrownMessage()

Accepted Answer

The ToString() method is overridden by the Exception class to provide a detailed error message that includes the message, stack trace, and other information about the Exception. This method is commonly used to log or display error messages to users.

Question 18

Each ____ block can "catch" one type of Exception .
A) finally
B) catch
C) try
D) Exception

Accepted Answer

A catch block is used to handle a specific type of exception.

Question 19

If you are working on a professional project, Microsoft recommends that you use the general Exception class in a catch block.

Accepted Answer

Microsoft recommends that you use specific exception classes in a catch block, rather than the general Exception class. This allows for better error handling and more targeted debugging.

Question 20

____ represents the degree to which a system is resilient to stress and able to maintain correct functioning.
A) Fault tolerance
B) Mission critical
C) Forgiveness
D) Robustness

Accepted Answer

Robustness represents the ability of a system to withstand stress and still maintain its correct functioning.

Quiz 11: Exception Handling

In C#, all exceptions are objects that are members of the ____ class or one of its derived classes.

The ____ methods are used to convert string data to another data type, such as int , double , or bool , without fear of generating an exception.

Typically, you use the ____ block to perform clean-up tasks that must occur, regardless of whether any errors occurred or were caught.

Errors you discover when compiling a program are considered to be exceptions.

When you write a block of code in which something can go wrong, you can place the code in a(n) ____ block.

The creators of C# define an infrequent event in code as one that happens in less than ____ percent of all program executions.

You can terminate an application with the ____ method.

An exception of the ____ class is thrown when an ongoing operation is aborted by the user.

An exception of the ____ class is thrown when an attempt is made to store an element of the wrong type within an array.

____ blocks contain statements that can never execute under any circumstances because the program logic "can't get there."

The Exception class contains a read-only property named ____ that contains useful information about an Exception object.

C# has more than 100 defined Exception subclasses.

You can place any number of statements in a try block, including those you know will never throw an exception.

Like all other classes in the C# programming language, the Exception class is a descendant of the ____ class.

You can deliberately generate a SystemException by forcing a program to contain an error.

The ____ block is used frequently with file input and output to ensure that open files are closed.

The Exception class overrides ____ to provide a descriptive error message so a user can receive precise information about the nature of any Exception that is thrown.

Each ____ block can "catch" one type of Exception .

If you are working on a professional project, Microsoft recommends that you use the general Exception class in a catch block.

____ represents the degree to which a system is resilient to stress and able to maintain correct functioning.