Miscellaneous in C Sharp MCQ question and answer with solution

31

What does the "var" keyword do in C#?

A) Declares a variable as a constant B) Specifies an implicitly typed variable C) Declares a variable as a pointer D) None of the above

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Answer & Solution

Answer: Option B

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32

Which of the following is NOT a valid type conversion in C#?

A) int to string B) double to int C) string to int D) int to double

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Answer: Option C

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33

What does the "out" keyword do in C# method parameters?

A) To pass parameters by reference B) To pass parameters by value C) To indicate the return value D) To indicate an output parameter

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Answer: Option D

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34

What does the "async" and "await" keywords do in C#?

A) To perform asynchronous operations B) To define a new thread C) To handle exceptions D) To declare a class

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Answer: Option A

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35

What is the purpose of the "is" keyword in C#?

A) Checks if an object is empty B) Checks if an object is null C) Compares two objects D) Checks if an object is of a certain type

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Answer: Option D

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36

What does the "as" keyword do in C#?

A) Defines a namespace B) Creates a new instance C) Performs type casting D) Declares a static method

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Answer & Solution

Answer: Option C

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37

What is the purpose of the "typeof" operator in C#?

A) Returns the index of a specified element B) Returns the address of a specified object C) Returns the type of a specified object D) Returns the size of a specified type

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Answer & Solution

Answer: Option C

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38

What does the "break" keyword do in a switch statement in C#?

A) Skips the current iteration B) Continues to the next iteration C) Throws an exception D) Exits the switch statement

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Answer: Option D

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39

What will be the output of the following C# code snippet?

public class A
{
    public int x;
    public int y;
    public void display() 
    {
        Console.WriteLine(x + " " + y);
    }
}
class Program
{
    static void Main(string[] args)
    {
        A obj1 = new A();
        A obj2 = new A();
        obj1.x = 1;
        obj1.y = 2;
        obj2 = obj1;
        obj1.display();
        obj2.display();
    }
}

A) 1 2 0 0 B) 1 2 1 2 C) 0 0 0 0 D) Run time exception

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Answer: Option B

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40

Which method is called when a thread is blocked from running temporarily?

A) Pulse() B) PulseAll() C) Wait() D) Both Pulse() & Wait()

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Answer & Solution

Answer: Option C

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Miscellaneous in C Sharp MCQ question and answer with solution | C# Program MCQs