php mcq questions with answers


                                
Which of the following statements are correct about the Collection Classes available in Framework Class Library?
                                
A.Elements of a collection cannot be transmitted over a network.
B.Elements stored in a collection can be retrieved but cannot be modified.
C.It is not easy to adopt the existing Collection classes for newtype of objects.
D.Elements stored in a collection can be modified only if allelements are of similar types.
E.They  use  efficient algorithms to  manage  the  collection, thereby improving the performance of the program.
                              
Click To Show Ans:E

                        
                                
Which  of the  following  statements  is incorrect  about delegate?
                                
A.Delegates are reference types.
B.Delegates are object oriented.
C.Delegates are type-safe.
D.Delegates serve the same purpose as function pointers in C and pointers to member function operators in C++.
E.Only one method can be called using a delegate.
                              
Click To Show Ans:E

                        
                                


In which of the following areas are delegates commonly used?



    

  1. Remoting

    2. 

  2. Serialization

    3. 

  3. File Input/Output

    4. 

  4. Multithreading

    5. 

  5. Event handling

    6. 





                                
A.1 and 2 only
B.1 and 5 only
C.1, 2 and 3 only
D.4 and 5 only
E.All of the above
                              
Click To Show Ans:D

                        
                                
Which   of   the   following   is   the   necessary   condition   for implementing delegates?
                                
A.Class declaration
B.Inheritance
C.Run-time Polymorphism
D.Exceptions
E.Compile-time Polymorphism
                              
Click To Show Ans:A

                        
                                


Which of the following statements are correct about the delegate declaration given below?



    delegate void del(int i);


    

  1. On declaring the delegate a class called del will get created.

    2. 

  2. The signature of del need not be same as the signature of the method that we intend to call using it.

    3. 

  3. The del class will be derived from the MulticastDelegate class.

    4. 

  4. The method that can be called using del should not be a static method.

    5. 

  5. The del class will contain a one-argument constructor and an lnvoke() method.

    6. 





                                
A.1, 2 and 3 only
B.1, 3 and 5 only
C.2 and 4 only
D.4 only
E.All of the above
                              
Click To Show Ans:B