Classes and Objects in C Sharp MCQs with Answers 2027

Q201

If a class inheriting an abstract class does not define all of its functions then it is known as?

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Q202

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

namespace ConsoleApplication4
{
    class A
    {
        public int i;
        public void display()
        {
            Console.WriteLine(i);
        }
    }    
    class B: A 
    {
        public int j;
        public void display() 
        {
            Console.WriteLine(j);
        }
    }    
    class Program
    {
        static void Main(string[] args)
        {
            B obj = new B();
            obj.j = 1;
            obj.i = 8;
            obj.display();
            Console.ReadLine();
        }
    }
}

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Q203

Open question

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

 enum per
{
    a, 
    b, 
    c, 
    d, 
}
per.a = 10;
Console.writeline(per.b);

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Q204

Open question

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

class sample
{
    public sample()
    {
        Console.WriteLine("THIS IS BASE CLASS constructor");
    }
 }    
public class sample1 : sample 
{
 
}    
class Program
{
    static void Main(string[] args)
    {
        sample1 obj = new sample1();
        Console.ReadLine();
    }
}

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Q205

Open question

Select the wrong statements among the following?

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Q206

Open question

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

class maths
{
    public int x;
    public double y;
    public int add(int a, int b)
    {
        x = a + b;
        return x;
    }
    public int add(double c, double d)
    {
        y = c + d;
        return (int)y;
    }
    public maths()
    {
        this.x = 0;
        this.y = 0;
    }
}    
class Program
{
    static void Main(string[] args)
    {
        maths obj = new maths();
        int a = 4;
        double b = 3.5;
        obj.add(a, a);
        obj.add(b, b);
        Console.WriteLine(obj.x + " " + obj.y);
        Console.ReadLine();
    }
}

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Q207

Open question

What will be the Correct statement in the following C# code?

interface a1
{
    void f1();
    int f2();
}
class a :a1
{
    void f1()
    {
    }
    int a1.f2()
    {
    }
}

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Q208

Open question

Which of the following statements are correct in nature?

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Q209

Open question

Which form of inheritance is not supported directly by C# .NET?

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Q210

Open question

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

class maths
{
    public int fact(int n)
    {
        int result;
        if (n == 2)
        return 1;
        result = fact(n - 1) * n;
        return result;
    }
} 
class Program
{
    static void Main(string[] args)
    {            
        maths obj = new maths();
        Console.WriteLine(obj.fact(4));
        Console.ReadLine();
    }
}

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Q211

Open question

Which among the following differentiates enum in C#.NET from enum in C language?

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Q212

Open question

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

class a
{
    public  void fun()
    {
        Console.WriteLine("base method");
    }
}
class b: a
{
    public new void fun()
    {
        Console.WriteLine(" derived method ");
    }
}
class Program
{
    static void Main(string[] args)
    {
        b k = new b();
        k.fun();
        Console.ReadLine();
    }
}

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Q213

Open question

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

class sample
{
    public  int i;
    void display() 
    {
        Console.WriteLine(i);
    }
}    
class sample1 : sample 
{
    public  int j;
    public void display() 
    {
        Console.WriteLine(j);
    }
}    
class Program
{
    static void Main(string[] args)
    {
        sample1 obj = new sample1();
        obj.i = 1;
        obj.j = 2;
        obj.display();
        Console.ReadLine();
    }
}

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Q214

Open question

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

 class abc
 {
     public static void a()
     {
         console.writeline("first method");
     }
     public void b()
     {
         a();
         console.writeline("second method");
     }
     public void b(int i)
     {
         console.writeline(i);
         b();
     }
 }
 class program
 {
     static void main()
     {
         abc k = new abc();
         abc.a();
         k.b(20);
     }
 }

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Q215

Open question

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

class Program
{
    static void Main(string[] args)
    {
        Console.WriteLine( vol(10));
        Console.WriteLine( vol(2.5f,  5));
        Console.WriteLine( vol( 5l,  4,  5));
        Console.ReadLine();
    }
    static int vol(int x)
    {
        return(x * x * x);
    }
    static float vol(float r,  int h)
    {
        return(3.14f * r * r * h);
    }
    static long vol(long l, int b, int h)
    {
        return(l * b * h);
    }
}

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Q216

Open question

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

class maths
{
    public int fun(int k, int y, int n)
    {
        Console.WriteLine(k + "  " + y + "  " + n);
        return (k);
    }
    public int fun1(int t,float z)
    {
        Console.WriteLine(t + "  " + z);
        return t;
    }
}    
class Program
{
    static void Main(string[] args)
    {
        maths obj = new maths();
        int b = 90;
        int c = 100;
        int d ;
        float l;
        int i = obj.fun(b, c, 12);
        int j = (obj.fun1(12, 14.78f));
        Console.ReadLine();
    }
}

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Q217

Open question

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

class sample
{
    public int i;
    public int[] arr = new int[10];
    public void fun(int i, int val)
    {
        arr[i] = val;
    }
}
class Program
{
    static void Main(string[] args)
    {
        sample s = new sample();
        s.i = 10;
        sample.fun(1, 5);
        s.fun(1, 5);
        Console.ReadLine();
    }
}

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Q218

Open question

The correct way to define a variable of type struct abc in the following C# code?

struct abc
{ 
    public string name;
    protected internal int age;
    private Single sal;
}

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Q219

Open question

Which of the following statements are correct about functions?

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Q220

Open question

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

static void Main(string[] args)
{
    int X = 0;
    if (Convert.ToBoolean(X = 0))
    Console.WriteLine("It is zero");
    else 
    Console.WriteLine("It is not zero");
    Console.ReadLine();
}

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Classes and Objects in C Sharppractice.

Classes and Objects in C Sharp
practice.