php mcq questions with answers


                                
Which of the following is the correct ways to set a value 3.14 in a variable pi such that it cannot be modified?
                                
A.float pi = 3.14F;
B.#define pi 3.14F;
C.const float pi = 3.14F;
D.const float pi; pi = 3.14F;
E.pi = 3.14F;
                              
Click To Show Ans:C

                        
                                


Which of the following statements are correct about data types?



    

  1. Each value type has an  implicit default constructor that initializes the default value of that type.

    2. 

  2. It is possible for a value type to contain the null value.

    3. 

  3. All value types are derived implicitly from System.ValueType class.

    4. 

  4. It is not essential that local variables in C# must be initialized before being used.

    5. 

  5. Variables of reference types referred to as objects and store references to the actual data.

    6. 





                                
A.1, 3, 5
B.2, 4
C.3, 5
D.2, 3, 4
                              
Click To Show Ans:A

                        
                                


Which of the following are the correct way to initialise the variables i and j to a value 10 each?



    

  1. 

    int i = 10; int j = 10;
    

    2. 

  2. 

    int i, j;
i = 10 : j = 10;
    

    3. 

  3. 

    int i = 10, j = 10;
    

    4. 

  4. 

    int i, j = 10;
    

    5. 

  5. 

    int i = j = 10;
    

    6. 





                                
A.2, 4
B.1, 3
C.3, 5
D.4, 5
                              
Click To Show Ans:B

                        
                                




Which of the following statement correctly assigns a value 33 to a variable c?


byte a = 11, b = 22, c;




                                
A.c = (byte) (a + b);
B.c = (byte) a + (byte) b;
C.c = (int) a + (int) b;
D.c = (int)(a + b);
E.c = a + b;
                              
Click To Show Ans:A

                        
                                


Which of the following statements are correct about datatypes in C#.NET?



    

  1. Every datatype is either a value type or a reference type.

    2. 

  2. Value types are always created on the heap.

    3. 

  3. Reference types are always created on the stack.

    4. 

  4. Mapping of every value type to a type in Common Type System facilitates Interoperability in C#.NET.

    5. 

  5. Every reference type gets mapped to a type in Common Type System.

    6. 





                                
A.1, 3
B.2, 5
C.1, 4
D.3, 4
                              
Click To Show Ans:C