Interview Questions

1. class CA { public static void Foo() { } } class Program { public static void Main() { CA a; a.Foo(); } } The above program gives

Options:

a. Compilation Error

b. Runtime exception is thrown

c. No error

d. All of the above

Reveal Answer

2. class CA { //....... } class Program { public static void Main() { CA a; // .... } } what is the default value of 'a'?

Options:

a. null

b. nothing

c. Explicitly assign in C#

d. None of the above

Reveal Answer

3. When an object of a class is created, memory is allocated for its member variables on the heap but they are not automatically initialized. Is this statement true or false?

Options:

a. True

b. False

Reveal Answer

4. public decimal Balance { get { return _Balance; } }

Options:

a. Balance is readonly property

b. Balance is writeonly property

c. Balance is global variable

d. Balance is readonly and writeonly property

Reveal Answer

5. class CA { private int _Id; public int Id { get { return _Id; } set { _Id = value; } } } What is the datatype of "value" in set block?

Options:

a. string

b. double

c. int

d. none of the above

Reveal Answer

6. Using a property in VB.NET the field member can be restricted with...

Options:

a. ReadOnly access

b. WriteOnly access

c. Either ReadOnly or WriteOnly access

d. None

Reveal Answer

7. What is the default access specifier for a member of a class?

Options:

a. public

b. private

c. protected

d. None

Reveal Answer

8. class CA { private CA() { } } class Program { static void Main(string[] args) { CA a = new CA(); } } What happens if the above program is compiled ?

Options:

a. No result

b. Compiles successfully.

c. Compilation Error.

d. None of the above.

Reveal Answer

9. class Program { static void Main(string[] args) { CA a; a = new CA(10); Console.WriteLine(a.Id); } } public class CA { private int _Id; public int Id { get { return _Id; } set { _Id = value; } } public CA(int Id) { Id = Id; } } What is the Output of this program?

Options:

a. 0

b. 10

c. compilation Error

d. Exception

Reveal Answer

10. When is the object ready for garbage collection?

Options:

a. The value of the object is changed.

b. Objects does not have reference

c. When using type casting

d. None of the above

Reveal Answer

11. class Program { public static void Main() { CA a = new CA(); CA b = a; a = null; } } class CA { //.. } In the above code among 'a' and 'b' which variable is ready for garbage collection?

Options:

a. a

b. b

c. None

Reveal Answer

12. class CA { bool Foo() { CA x = null; if (x.Equals(null)) return true; else return false; } static void Main() { CA a = new CA(); bool result = a.Foo(); Console.WriteLine(result); } } What is the result of above program.

Options:

a. Returns True

b. Returns False

c. Compilation Error

d. Runtime Exception

Reveal Answer

13. public class CA { private string _Name; public string Name { get { return _Name; } set { if (value.Length > 8) throw new ApplicationException("Name cannot be > 8 characters"); _Name = value; } } } class Program { public static void Main() { CA objCA = new CA(); objCA.Name = "Encyclopedia"; } } What would be the output of the above program?

Options:

a. Compiletime Error.

b. Exception is raised

c. Will be executed successfully.

Reveal Answer

14. Is it possible to force the activation of Garbage collection?

Options:

a. Yes

b. No

Reveal Answer

15. Can we overload constructors

Options:

a. Yes

b. No

Reveal Answer

16. class CA { public CA(int a) { } } Can we create an object of a class as below CA a = new CA();

Options:

a. Yes

b. No

Reveal Answer

17. Copy constructor is used to ______

Options:

a. copy few parameters

b. create an object by name “copy”

c. create an object by passing an initialized object of the same type

d. There is no copy constructor available

Reveal Answer

18. Can a constructor be invoked explicitly Modified: Is it possible to invoke constructor explicitly?

Options:

a. Yes

b. No

Reveal Answer

19. class CA { public CA() { Console.WriteLine("In Default"); } public CA(int a) : this() { Console.WriteLine("In Parameterised"); } } class Program { static void Main(string[] args) { CA a = new CA(10); } } What is the output?

Options:

a. Compilation error

b. In default

c. In parameterized

d. Both B and C

Reveal Answer

20. If a class doesn’t have any type of constructor in definition, a public _____________ is automatically added to it by the language compiler.

Options:

a. Default parameterized constructor

b. Default constructor

c. Static constructor

Reveal Answer

21. class CA { public New() { Console.WriteLine("Hello World"); } } class Program { static void Main(string[] args) { CA a = new CA(); } } What is the output?

Options:

a. Hello World

b. Compilation Error

c. Runtime Error

d. None

Reveal Answer

22. Can we declare the constructor of a class as Private?

Options:

a. Yes

b. No

Reveal Answer

23. We can overload destructors

Options:

a. Yes

b. No

Reveal Answer

24. Can we declare destructor as public?

Options:

a. Yes

b. No

Reveal Answer

25. class CA { ~CA() { Console.WriteLine("In Destructor"); } } class Program { static void Main(string[] args) { CA a = new CA(); a = null; Console.WriteLine("Main ends"); } } What is the output?

Options:

a. Main ends

b. In destructor

c. Both A and B

d. Compilation error

Reveal Answer

26. When is destructor invoked?

Options:

a. When an object is no longer used by the application

b. When program exits

c. When invoked by GC

d. All of the above

Reveal Answer

27. Class CA { public void CA() { Console.WriteLine("In Constructor"); } //.... } class Program { static void Main(string[] args) { CA a = new CA(); } } What is the output?

Options:

a. In destructor

b. Null

c. Compilation error

Reveal Answer

28. class CA { public CA() { Console.WriteLine("In default constructor"); } //.... } class Program { static void Main(string[] args) { Console.WriteLine("Main Begins"); CA a; Console.WriteLine("Main Ends"); } }

Options:

a. Main Begins

b. Main Ends

c. In default constructor

d. Both A and B

e. A, C and then B

Reveal Answer

29. struct SA { int M1, M2; public SA() { } } What happens if this code is compiled?

Options:

a. Compilation error

b. No compilation error but runtime error when this structure is used

c. No compilation error and no runtime error

d. Runtime exception is thrown if this structure is instantiated

Reveal Answer

30. struct SA { int M1, M2; public SA(int m1) { M1 = m1; } } Is anything wrong in the above structure?

Options:

a. Yes

b. No

Reveal Answer

31. When are static members of the class allocated memory.

Options:

a. When the object is created

b. When the class is loaded

c. When the application is started

d. None of the above

Reveal Answer

32. When is the class loaded by class loader in CLR?

Options:

a. When the first instance of the class is created

b. When the static member of the class is accessed for the first time

c. Both A and B

Reveal Answer

33. Static members of the class can be used for storing global data in the application

Options:

a. Yes

b. No

Reveal Answer

34. class CA { static CA() { } } What is the name given to the mentioned member of class CA?

Options:

a. Constructor

b. Static constructor

c. Static method

d. None of the above

Reveal Answer

35. Which of the following is true about static constructor

Options:

a. To initialize static members of the class

b. To initialize static and instance members of the class

c. Static constructor can be overloaded

d. static constructor must be public

Reveal Answer

36. Arrange the following in sequence when the first object is created i. Instance constructor is executed. ii. Class is loaded. iii. Instance members are loaded and allocated memory. iv. Shared members are loaded and allocated memory. v. Shared constructor is executed.

Options:

a. ii, ii, v, iv ,iii

b. ii ,v ,iv ,ii ,i

c. ii ,iv ,v, i, iii

Reveal Answer

37. Static constructor can access instance members of the class.

Options:

a. Yes

b. No

Reveal Answer

38. class CA { public static int S1; private static int S2; public int I1 } If 5 objects of this class is created then how many copies of S1, S2 and I1 are allocated memory.

Options:

a. 1 1 1

b. 1 0 1

c. 1 0 5

d. 1 1 5

e. 1 5 5

f. 5 1 5

Reveal Answer

39. class SA { public static int S1; static SA() { S1++; Console.WriteLine("In Static contructor: " + S1); } public SA() { ++S1; Console.WriteLine("In constructor: " + S1); } } class Program { static void Main(string[] args) { SA a = new SA(); } } What is the output?

Options:

a. In Static constructor: 1

b. In constructor: 2

c. Both A and B

Reveal Answer

40. static class SA { public static int S1; static SA() { S1++; Console.WriteLine("In Static contructor: " + S1); } public SA() { S1++; Console.WriteLine("In constructor: " + S1); } } class Program { static void Main(string[] args) { SA a = new SA(); } } What is the o/p?

Options:

a. In Static constructor: 1

b. In constructor: 2

c. Both A and B

d. Compilation error

Reveal Answer

41. class SA { public static int S1 = 5; public int M1 = 5; public static void Foo() { S1++; M1++; } } class Program { static void Main() { SA a = new SA(); SA.Foo(); Console.WriteLine(a.M1 + " " + SA.S1); } } What is the o/p?

Options:

a. Compilation Error

b. Runtime Exception

c. 1 1

d. 6 6

e. 1 6

f. 6 1

Reveal Answer

42. Can we access static members of a class in instance method of same class? Justify your answer?

Options:

a. Yes

b. No

Reveal Answer

43. class SA { public static int _S1 = 0; public _______ int S1 { get { return _S1; } } } Fill in the blank above?

Options:

a. Static

b. Blank

c. Both A and B

Reveal Answer

44. Class SA { public static int S1 = 0; public int M1 = 10; public static void Foo() { SA a = new SA(); Console.WriteLine(a.M1); } } class Program { static void Main() { SA.Foo(); } } What is the o/p? Justify your answer?

Options:

a. 0

b. 10

c. Compilation Error

d. Runtime Exception

Reveal Answer

45. What is a Singleton Class?

Options:

a. Can be accessed globally

b. Instantiated only once

c. Singleton's constructor is set to private so that there be only one instance of this class.

d. All of the above

Reveal Answer

46. class SingletonDemo { public int Data; private static SingletonDemo obj; ____ SingletonDemo () { } public _ ______ GetObject() { if (obj == null) obj = new SingletonDemo (); return obj; } } Fill in the blanks above so that the class is singleton.

Options:

a. Static, private, SingletonDemo

b. Private, SingletonDemo, static

c. Private, static, SingletonDemo

Reveal Answer

47. Does Garbage Collection disposes a object even if you abort the application in the middle?

Options:

a. Yes

b. No

Reveal Answer

48. Shadowing is:

Options:

a. To override the base class method

b. To provide a different implementation of base class sealed method

c. To overload the base class method

d. None of the above

Reveal Answer

49. If parameter/ local variable and data member of a class have same name, _______

Options:

a. The data member takes the precedence over local variable

b. The local variable takes the precedence over data member

c. Not valid

Reveal Answer

50. ________ is used to initialize the static/ shared member dynamically and is executed when the class is loaded.

Options:

a. Constructor

b. Shared constructor

c. Static constructor

d. None of the above

Reveal Answer

51. Which of these methods are used instead of a Finalize method?

Options:

a. Close

b. Dispose

c. Both a & b

d. None of the above

Reveal Answer

52. Late Binding refers to a call that

Options:

a. Decides if a method exists at runtime

b. Decides if a method exists at compile time

c. Decides if a method exists once the class is instantiated

d. None of the above

Reveal Answer

53. Name the Top .NET base class that everything is derived from?

Options:

a. System.object

b. System.Data

c. System.web

Reveal Answer

54. Compiler generates a type definition for the myClass, giving it a Name property as String and a Age property as int. This helps in late binding as well.An Anonymous type is ______

Options:

a. way to encapsulate a set of read-only properties into a single object

b. We can create anonymous types by using the new operator together with an object initialize

c. Type name is generated by the compiler

d. All of the above

Reveal Answer

55. Principal object is used for:

Options:

a. To represent authenticated users

b. To represent a cookie

c. To represent HttpContext object

d. None of the above

Reveal Answer

56. Access modifier are used to__________

Options:

a. Specify data type

b. specify the declared accessibility of a member or a type

c. specify size of the variable

d. the value of the variable

Reveal Answer

57. How many access modifiers available?

Options:

a. 4

b. 5

c. 3

Reveal Answer

58. An object has______

Options:

a. properties for validations

b. Methods for functionality

c. Events for depicting the change of state

d. All the above

Reveal Answer

59. Encapsulation is used to

Options:

a. Exhibit an object in different form with the same functionality

b. For the reusability of the code

c. Binding of data and behavior in controlled environment

Reveal Answer

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