Mphasis Placement Paper -: .Net Questions With Answers

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1. Which keyword is used to define a class in C#?

   A: Class

   B: class

   C: System.Class

   D: OOPS.class

   Ans: B

   Explanation:

   The class keyword is used to define a class in C#.

   Syntax:
   class class_name
   {
     // Class Definition
   }
       

2. Which is the correct way to declare an object of the class in C#?

   A: Class_Name Object_Name = new Class_Name();

   B: Class_Name Object_Name;

   C: new Object_Name as Class_Name();

   D: Both A and B

   Ans: A

   Explanation:

   The correct way to declare an object of the class in C# is:

   Class_Name Object_Name = new Class_Name();
       

   Example:

   using System;
   
   namespace MyApplication {
     class Mobiles {
       string brand = "Apple";
   
       static void Main(string[] args) {
         Mobiles mobile = new Mobiles();
         Console.WriteLine(mobile.brand);
       }
     }
   }
   // Output: Apple
       

3. Which operator is used to access variables/fields inside a class in C#?

   A: Arrow Operator (->)

   B: Dot Operator (.)

   C: Greater Than (>)

   D: Dot and Greater Than (.>)

   Ans: B

   Explanation:

   The dot (.) operator is used to access variables/fields in a class in C#.

   Syntax:
   Class_Name.Variable_Name/Field_Name;
       

4. Is overriding of a function possible in the same class in C#?

   A: Yes

   B: No

   Ans: B

   Explanation:

   No, overriding of a function is not possible in the same class in C#. The override modifier is required to extend or modify the implementation of an inherited method.

5. Which is not a type of constructor in C#?

   A: Static Constructor

   B: Private Constructor

   C: Body Constructor

   D: Parameterized Constructor

   Ans: C

   Explanation:

   There are 5 types of constructors in C#: Static, Private, Copy, Default, and Parameterized constructors.

6. How many types of access modifiers in C#?

   A: 2

   B: 3

   C: 4

   D: 5

   Ans: C

   Explanation:

   In C#, there are 4 types of access modifiers: public, private, protected, and internal.

7. What does the access modifier do in C#?

   A: To maintain the syntax

   B: To define a variable inside the class

   C: To access the variables defined inside the class

   D: To control the visibility of class members

   Ans: D

   Explanation:

   Access modifiers control the visibility of class members, providing a security level for each individual class and member.

8. The internal access modifier is used for ___.

   A: Types and type members

   B: Defining a field that can be accessed in all classes

   C: Defining a field that can be accessed in inherited classes

   D: All of the above

   Ans: A

   Explanation:

   The internal access modifier is used for types and type members. They are accessible only within files in the same assembly.

9. The protected access modifier defines a member that can be accessible within ___.

   A: its class and all other classes

   B: its class and by derived class instances

   C: its class only

   D: None of the above

   Ans: B

   Explanation:

   The protected access modifier defines a member that can be accessible within its class and by derived class instances.

10. Does C# support multiple inheritance?

    A: Yes

    B: No

    Ans: B

    Explanation:

    No, C# does not support multiple class inheritance.

11. Which C# concept has the capability of an object to take a number of different forms and hence display behavior accordingly?

    A: Polymorphism

    B: Encapsulation

    C: Abstraction

    D: None of the above

    Ans: A

    Explanation:

    Polymorphism allows an object to take on multiple forms and display different behaviors accordingly.

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

    using System;
    
    namespace MyApplication {
      public class Class1 {
        public static int x = 10;
      }
      public class Class2: Class1 {
        public static int x = 20;
        static void Main(string[] args) {
          Console.WriteLine(x + ", " + Class1.x);
        }
      }
    }
        

    A: 20, 20

    B: 10, 10

    C: 20, 10

    D: Exception

    Ans: C

    Explanation:

    The code prints the value of x in Class2 and Class1.x, resulting in "20, 10".

13. What is the C# keyword which is used to change data and behavior of a base class by replacing a member of the base class with a new derived member?

    A: overrides

    B: protected

    C: base

    D: new

    Ans: D

    Explanation:

    The new keyword is used to change data and behavior of a base class by replacing a member with a new derived member.