Delegates and Events in C Sharp MCQ question and answer with solution

41

Choose the incorrect statement about delegates?

A) delegates are not type safe B) delegates can be used to implement callback notification C) delegate is a user defined type D) delegates permits execution of a method in an asynchronous manner

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Answer & Solution

Answer: Option A

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42

Incorrect statements about delegates are?

A) Delegates are reference types B) Delegates are object oriented C) Delegates are type safe D) Only one method can be called using a delegate

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Answer & Solution

Answer: Option D

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43

What does the following C# code block defines?

class Gen<T> 
{  
     T ob;    
}

A) Generics class declaration B) Generic constructor declaration C) A simple class declaration D) All of the mentioned

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Answer & Solution

Answer: Option A

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44

Which of the following is the correct way to call the subroutine function abc() of the given class in the following C# code?

class csharp
{
    void abc()
    {
        console.writeline("A:Just do it!");
    }
}

A)

csharp c = new csharp();
delegate void d = new del(ref abc);
d();

B)

delegate void del();
del d;
csharp s = new csharp();
d = new del(ref s.abc);
d();

C)

   csharp s = new csharp();
   delegate void del = new delegate(ref abc);
   del();

D) None of the mentioned

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Answer & Solution

Answer: Option B

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45

Which among the following is the correct statement about delegate declaration?

delegate void del(int i);

A) on declaring the delegate, a class called del is created B) the del class is derived from the MulticastDelegate class C) the del class will contain a one argument constructor and an invoke() method D) all of the mentioned

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Answer & Solution

Answer: Option D

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46

Are generics in C# are same as the generics in java and templates in C++?

A) Yes B) No C) May be D) None of the mentioned

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Answer & Solution

Answer: Option B

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47

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

public class Generic<T>
{
    Stack<T> stk = new Stack<T>();
    public void push(T obj)
    {
        stk.Push(obj);
    }
    public T pop()
    {
        T obj = stk.Pop();
        return obj;
    }
}
class Program
{
    static void Main(string[] args)
    {
        Generic<string> g = new Generic<string>();
        g.push(30);
        Console.WriteLine(g.pop());
        Console.ReadLine();
    }
}

A) 0 B) 30 C) Runtime Error D) Compile time Error

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Answer & Solution

Answer: Option B

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48

Which of the given statements are valid about generics in .NET Framework?

A) generics are useful in collection classes in .NET framework B) generics delegates are not allowed in C#.NET C) generics is a not language feature D) all of the mentioned

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Answer & Solution

Answer: Option A

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49

Which of the following statements are valid in the following C# code snippet?

public class Generic<T>
{
    public T Field;
    public void testSub()
    {
        T i = Field + 1;
    }
}
class Program
{
    static void Main(string[] args)
    {
        Genericlt;int>g = new Genericlt;int>();
        g.testSub();
    }
}

A) code runs successfully but prints nothing B) code runs successfully and prints 1 C) program will give run time error D) compile time error

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Answer & Solution

Answer: Option D

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50

Choose the correct way to call subroutine fun() of the sample class?

class a
{
    public void x(int p, double k)
    {
        Console.WriteLine("k : csharp!");
    }
}

A)

delegate void del(int i);
x s = new x();
del d = new del(ref s.x);
d(8, 2.2f);

B)

delegate void del(int p,  double k);
del d;
x s = new x();
d = new del(ref s.x);
d(8, 2.2f);

C)

x s = new x();
delegate void d = new del(ref x);
d(8, 2.2f);

D) all of the mentioned

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Answer & Solution

Answer: Option B

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