php mcq questions with answers


                                


Which of the following statements are correct about the Stack collection?



    

  1. It can be used for evaluation of expressions.

    2. 

  2. All elements in the Stack collection can be accessed using an enumerator.

    3. 

  3. It is used to maintain a FIFO list.

    4. 

  4. All elements stored in a Stack collection must be of similar type.

    5. 

  5. Top-most element of the Stack collection can be accessed using the Peek() method.

    6. 





                                
A.1 and 2 only
B.3 and 4 only
C.1, 2 and 5 only
D.All of the above
E.None of the above
                              
Click To Show Ans:C

                        
                                
A HashTable t maintains a collection of names of states and capital city of each state. Which of the following is the correct way to find out whether "Kerala" state is present in this collection or not?
                                
A.t.ContainsKey("Kerala");
B.t.HasValue("Kerala");
C.t.HasKey("Kerala");
D.t.ContainsState("Kerala");
E.t.ContainsValue("Kerala");
                              
Click To Show Ans:A

                        
                                


Which of the following is the correct way to access all elements of the Queue collection created using the C#.NET code snippet given below?



Queue q = new Queue(); 
q.Enqueue("Sachin"); 
q.Enqueue('A'); 
q.Enqueue(false); 
q.Enqueue(38); 
q.Enqueue(5.4);




                                
A.IEnumerator e;
e = q.GetEnumerator(); 
while (e.MoveNext())
Console.WriteLine(e.Current);
B.IEnumerable e;
e = q.GetEnumerator(); 
while (e.MoveNext()) 
Console.WriteLine(e.Current);
C.IEnumerator e;
e = q.GetEnumerable(); 
while (e.MoveNext()) 
Console.WriteLine(e.Current);
D.IEnumerator e;
e = Queue.GetEnumerator(); 
while (e.MoveNext()) 
Console.WriteLine(e.Current);
                              
Click To Show Ans:A

                        
                                
Which  of the following is NOT an interface declared  in System.Collections namespace?
                                
A.IComparer
B.IEnumerable
C.IEnumerator
D.IDictionaryComparer
E.IDictionaryEnumerator
                              
Click To Show Ans:D