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

Which reference modifier is used to define reference variable?

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

class maths
{
    int i;
    public maths(int x)
    {
        i = x;
        Console.WriteLine(" hello: ");
    }
}
class maths1 : maths
{
    public  maths1(int x) :base(x)
    {
        Console.WriteLine("bye");
    }
}
class Program
{
    static void Main(string[] args)
    {
        maths1 k = new maths1(12);
        Console.ReadLine();
    }
}

"A mechanism that binds together code and data in manipulates, and keeps both safe from outside interference and misuse. In short it isolates a particular code and data from all other codes and data. A well-defined interface controls access to that particular code and data."

To override a method in the subclass, the base class method should be defined as?

Calculate the number of bytes a structure variable s occupies in the memory if it is defined as follows.

class abc
{
    int i;
    Decimal d;
}
struct sample
{
   private int x;
   private Single y;
   private trial z;
}
sample s = new sample();

What is Recursion in CSharp defined as?

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

class maths
{
    int i;
    public maths(int ii)
    {
        ii = 12;
        int j = 12;
        int r = ii * j;
        Console.WriteLine(r);
    }
}
class maths1 : maths
{
    public maths1(int u) :base(u)
    {
        u = 13;
        int h = 13;
        Console.WriteLine(u + h);
    }
}
class maths2 : maths1
{
    public maths2(int k) :base(k)
    {
        k = 24;
        int o = 6 ;
        Console.WriteLine(k /o);
    }
}
class Program
{
    static void Main(string[] args)
    {
        maths2 t = new maths2(10);
        Console.ReadLine();
    }
}

Which keyword is used to refer baseclass constructor to subclass constructor?

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

class test
{
    public void print()
    {
        Console.WriteLine("Csharp:");
    }
}
class Program
{
    static void Main(string[] args)
    {
        test t;
        t.print();
        Console.ReadLine();
    }
}

Which return statement correctly returns the output?