Sematec .Net Fundamentals Quiz
Questions and Answers
- 1.
Which of the following converts a type to a long data type in C#?
- A.
ToInt64
- B.
ToSbyte
- C.
ToSingle
- D.
ToInt32
Correct Answer
A. ToInt64Explanation
The ToInt64 method in C# converts a given type to a long data type. This method is used when you want to convert a value to a long integer.Rate this question:
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- 2.
Which of the following parameter type should have a value before passing to the method?
- A.
Reference parameters
- B.
Value parameters
- C.
Output parameters
- D.
None of the above
Correct Answer
A. Reference parametersExplanation
Reference parameters should have a value before passing to the method because they are used to pass the memory address of a variable to the method. This means that the method can directly modify the value of the variable in the calling code. If the reference parameter does not have a value before passing it to the method, the method would not have a valid memory address to work with and may cause errors or unexpected behavior.Rate this question:
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- 3.
Which of the following is true about catch block in C#?
- A.
A program catches an exception with an exception handler at the place in a program where you want to handle the problem
- B.
The catch keyword indicates the catching of an exception.
- C.
Both of the above.
- D.
None of the above
Correct Answer
B. The catch keyword indicates the catching of an exception.Explanation
The catch block in C# is used to handle exceptions in a program. It is placed at the location in the program where the developer wants to handle the exception. The catch keyword is used to indicate that the code inside the block is responsible for catching and handling the exception. Therefore, the correct answer is "The catch keyword indicates the catching of an exception."Rate this question:
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- 4.
What is the difference between the Debug class and Trace class?
- A.
Use Debug class for debug builds, use Trace class for both debug and release builds
- B.
Both are same
- C.
Use Trace class for debug builds, use Debug class for both debug and release builds
- D.
None of above
Correct Answer
A. Use Debug class for debug builds, use Trace class for both debug and release buildsExplanation
The Debug class and Trace class are both used for debugging purposes in software development. However, the main difference between them is the build configuration in which they are used. The Debug class is specifically intended for debug builds, which means it is only active during the development and testing phase. On the other hand, the Trace class can be used in both debug and release builds, allowing developers to include tracing information in their code even in the final released version of the software. This allows for easier troubleshooting and debugging in production environments.Rate this question:
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- 5.
Which of the following keyword you should use to create method that takes a variable number of arguments?
- A.
Ref
- B.
Out
- C.
Params
- D.
Default
Correct Answer
C. ParamsExplanation
The keyword "params" should be used to create a method that takes a variable number of arguments. The "params" keyword allows us to pass a variable number of arguments of the same type to a method. It is useful when we do not know how many arguments will be passed to the method at compile time. By using the "params" keyword, we can pass an array of arguments to the method, making it more flexible and adaptable to different scenarios.Rate this question:
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- 6.
What are the different ways a method can be overloaded?
- A.
Different parameter data types
- B.
Different number of parameters
- C.
Different order of parameters
- D.
All of the above
Correct Answer
D. All of the aboveExplanation
The different ways a method can be overloaded include using different parameter data types, different number of parameters, and different order of parameters. Overloading a method allows for flexibility in how it can be called, as it can accept different types and numbers of arguments. By providing multiple versions of a method with different parameter configurations, it becomes easier to use and adapt the method to different situations. Therefore, the correct answer is "All of the above."Rate this question:
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- 7.
Which of the following options is correct about Enum?
- A.
It is used to initialize variables
- B.
It is used to define new data type
- C.
It is used to define variables
- D.
None
Correct Answer
B. It is used to define new data typeExplanation
The correct answer is "It is used to define new data type". In Java, an enum is a special data type that allows for a variable to be a set of predefined constants. It is used to define a collection of related values that can be assigned to a variable. Enums are commonly used to represent a fixed set of values, such as days of the week or months of the year. By using enums, the code becomes more readable and maintainable as it provides a clear and concise way to define and use a set of constants.Rate this question:
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- 8.
Which of the following options is correct about local variable?
- A.
It must be declared within a method
- B.
It represents a class object
- C.
It can be used anywhere in the program
- D.
It must accept a class
Correct Answer
A. It must be declared within a methodExplanation
A local variable is a variable that is declared within a method. It is only accessible within the scope of that method and cannot be used outside of it. Local variables are used to store temporary data that is needed for the execution of the method. They are typically used to perform calculations or store intermediate results. Since local variables are specific to a particular method, they cannot be accessed or used anywhere else in the program.Rate this question:
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- 9.
Which of the window in Visual Studio you can use to change variable values during debugging C# application?
- A.
Analyzing Window
- B.
Call Stack Window
- C.
Output Window
- D.
Immediate Window
Correct Answer
D. Immediate WindowExplanation
The Immediate Window in Visual Studio allows you to change variable values during debugging a C# application. This window provides a command-line interface where you can enter expressions and statements to be executed in the current context of the application. It is useful for testing and modifying variables on the fly, without the need to recompile or restart the application.Rate this question:
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- 10.
Which statement you can use to increase length of an array dynamically?
- A.
Array.Rebound
- B.
Array.IndexOf
- C.
Array.Resize
- D.
Array.Sort
Correct Answer
C. Array.ResizeExplanation
The correct answer is Array.Resize. Array.Resize is a method in C# that allows you to increase the length of an array dynamically. It takes two parameters: the array to resize and the new size of the array. This method creates a new array with the specified size and copies the elements from the original array to the new array. It is commonly used when you need to add new elements to an array or increase its capacity.Rate this question:
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