C# Class MCQs

Question 16: Which of the following statements is TRUE?

• A readonly field can be initialized either at the declaration or in a constructor.
• A readonly field can be initialized either at the declaration or in a constructor or static methods.
• A readonly field can only be initialized in a constructor.
• A readonly field can only be initialized at the declaration.

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Question 17: What will be the output of the following program?

public static void Main(string[] args)
{
	display();
}

static void display(int i =10){
    Console.Write(i);
}

• Compile-time error
• Runtime error
• 0
• 10

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Question 18: What the following statement does?

Object.ReferenceEqual(obj1, obj2)

• Checks ob1 value is equal to obj2 value.
• Checks obj1 and obj2 are the same object.
• Checks obj1 and obj2 are reference types.
• Refers obj1 as obj2.

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object x = "Hi";
object y = x;
Object.ReferenceEquals(x, y);

Question 19: What will be the output of the following program?

public static void Main(string[] args)
{
	String str1, str2; 
    str1 = "Hello"; 
    str2 = "Hello";
		
	Console.Write(Object.ReferenceEquals(str1, str2));
}

• True
• False
• Compile-time error
• Runtime error

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Question 20: What will be the output of the following program?

public static void Main(string[] args)
{
	string str1 = "Hi";
	string str2 = String.Copy(str1);
		
	Console.Write(Object.ReferenceEquals(str1, str2));
}

• True
• False

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