Classes and Objects in C Sharp MCQ question and answer with solution

1

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

int a+= (float) b/= (long)c.

A) float B) int C) long D) none of the mentioned

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Answer & Solution

Answer: Option B

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2

Which of the following statements is correct?

A) Each derived class does not have its own version of a virtual method B) If a derived class does not have its own version of virtual method then one in base class is used C) By default methods are virtual D) All of the mentioned

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Answer: Option C

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3

Which statements are correct?

A) If a base class consists of a member function fun() and a derived class do not have any function with this name. An object of derived class can access fun() B) A class D can be derived from class C, which is derived from class B which in turn is derived from class A C) If a base class and a derived class each include a member function with same name, the member function of the derived class will be called by object of derived class D) All of the mentioned

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Answer: Option D

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4

How many values does a function return?

A) 0 B) 2 C) 1 D) any number of values

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Answer: Option C

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5

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

namespace ConsoleApplication4
{
    public abstract class A
    {
        public int i = 7;
        public abstract void display();
    }    
    class B: A 
    {
        public int j;
        public override void display() 
        {
            Console.WriteLine(i);
            Console.WriteLine(j);
        }
    }    
    class Program
    {
        static void Main(string[] args)
        {
            B obj = new B();
            A obj1 = new B();
            obj.j = 1;
            obj1.i = 8;
            obj.display();
            Console.ReadLine();
        }
    }
}

A) 0, 8 B) 1, 8 C) 1, 7 D) 7, 1

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Answer: Option D

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6

What does the following C# code imply?

csharp abc;
abc = new charp();

A) Object creation on class csharp B) Create an object of type csharp on heap or on stack depending on the size of object C) create a reference c on csharp and an object of type csharp on heap D) create an object of type csharp on stack

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Answer: Option C

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7

Choose the correct statements about enum used in C#.NET?

A) An enum variable cannot have a private access modifier B) An enum variable can be defined inside a class or a namespace C) An enum variable cannot have a protected access modifier D) An enum variable cannot have a public access modifier

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Answer: Option C

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8

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

 class A 
 {
     public virtual void display() 
     {
         Console.WriteLine("A");
     }    
 }    
 class B: A 
 {
    public override void display() 
    {
        Console.WriteLine(" B ");
    } 
 }    
class Program
{
    static void Main(string[] args)
    {
        A obj1 = new A();
        B obj2 = new B();
        A r;
        r = obj1;
        r.display();
        r = obj2;
        r.display();     
        Console.ReadLine();
    }
}

A) A, A B) B, B C) Compile time error D) A, B

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Answer: Option D

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9

Which is the correct way to create an object of the given class abc?

A) Declaring existing class as sealed B) Declaring existing class as override C) Declaring existing class as overloads D) Declaring existing class as shadows

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Answer: Option A

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10

Which of these is not a correct statement?

A) A recursive method must have a base case B) Recursion always uses stack C) Recursion is always managed by C# Runtime environment D) Recursive methods are faster that programmer written loop to call the function repeatedly using a stack

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Answer: Option C

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