Mphasis Placement Paper -: .Net Questions With Answers

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1. Which keyword is used to declare an interface in C#?

   A: interface

   B: Interface

   C: implement

   D: Implement

   Ans: A

   Explanation:

   In C#, an interface can be declared using the interface keyword. An interface can contain declarations of methods, properties, indexers, and events.

2. In C#, by default, the default interface methods are ___.

   A: virtual

   B: sealed

   C: private

   D: public

   Ans: A

   Explanation:

   In C#, by default, the default interface methods are virtual unless the sealed or private modifier is used.

3. In C#, the objects created using the new operator are stored in ___.

   A: Cache Memory

   B: Stack Memory

   C: Heap Memory

   D: None of the above

   Ans: C

   Explanation:

   In C#, the objects created using the new operator are stored in Heap Memory.

4. Which of the following cannot be used to declare an interface in C#?

   A: Methods

   B: Properties

   C: Events

   D: Structures

   Ans: D

   Explanation:

   In C#, to declare an interface, we cannot use structures.

5. Which access specifier is used in an interface in C#?

   A: private

   B: public

   C: protected

   D: All of the above

   Ans: B

   Explanation:

   In C#, the interface members are always public, because the purpose of an interface is to enable other types to access a class or struct. No other access modifiers can be applied to interface members.

6. Which type of class does not have its own objects but acts as a base class for its subclass in C#?

   A: Abstract Class

   B: Static Class

   C: Sealed Class

   D: Protected Class

   Ans: A

   Explanation:

   In C#, the Abstract Class does not have its own objects but acts as a base class for its subclass.

7. Which modifier is used while redefining an abstract method by a derived class in C#?

   A: Overloads

   B: New

   C: Overrides

   D: Virtual

   Ans: C

   Explanation:

   In C#, the Overrides modifier is used while redefining an abstract method by a derived class.

8. Does C# support pointers?

   A: Yes

   B: No

   Ans: A

   Explanation:

   Yes, C# supports pointers to a limited extent.

9. A C# pointer is used to store the ___ of another type.

   A: Value

   B: Memory address

   C: Size of the type

   D: Reference of the variable

   Ans: B

   Explanation:

   A C# pointer is used to store the memory address of another type.

10. C# pointers can only be declared to hold the memory address of ___.

    A: value types and arrays

    B: reference types

    C: pointer types

    D: reference and pointer types

    Ans: A

    Explanation:

    C# pointers can only be declared to hold the memory address of value types and arrays. Unlike reference types, pointer types are not tracked by the garbage collection mechanism.

11. How many catch blocks can be used with a single try block in C#?

    A: One

    B: Two

    C: Many

    D: None of the above

    Ans: C

    Explanation:

    In C#, there can be multiple (many) catch blocks with a single try block.

12. Is the use of a return statement necessary in every function in C#?

    A: Yes

    B: No

    Ans: A

    Explanation:

    Yes, the use of a return statement is necessary in every function in C#.

13. Which access specifier should be used for the Main() method in C#?

    A: private

    B: public

    C: protected

    D: internal

    Ans: B

    Explanation:

    The C# Main() method should be defined as public because it is called by runtime. By default, the Main() method is private.

14. In C#, a namespace is a collection of classes?

    A: True

    B: False

    Ans: A

    Explanation:

    Yes, a namespace is a collection of classes.

15. Which is the C# class from which the UInt data type is derived?

    A: System.Int16

    B: System.Int32

    C: System.UInt16

    D: System.UInt32

    Ans: D

    Explanation:

    The UInt data type is derived from the System.UInt32 class.

16. Which is the first line of a C# program?

    A: using System;

    B: using system;

    C: using Namespace;

    D: namespace MyApplication

    Ans: A

    Explanation:

    The first line of a C# program is:

    using System;