Interview Questions

1. What data type should be used when we want to store any type of data?

Options:

a. int

b. float

c. double

d. object

Reveal Answer

2. What is an Immutable variable?

Options:

a. An object whose value cannot be changed once it is set.

b. type An object whose value can be changed once it is set.

c. Both

Reveal Answer

3. Which Exception is thrown when a variable on RHS is casted to and is not as of type on LHS?

Options:

a. Invalid cast Exception

b. Argument Null Exception

c. Application Exception

d. System Exception

Reveal Answer

4. What is the default value of the first enum member?

Options:

a. 1

b. 0

Reveal Answer

5. _______ is the term used to describe the transformation from Value Type to reference type.

Options:

a. Boxing

b. UnBoxing

c. Implicit Casting

d. Explicit Casting

Reveal Answer

6. class Program { static void Main(string[ ] args) { int n; char chr; chr = (char)(65); Console.WriteLine(chr); chr = 'a'; n = (int)(chr); Console.WriteLine(n); } }

Options:

a. 65, a

b. a, 65

c. A, 97

d. 65, A

Reveal Answer

7. Can a decimal be categorized as floating point datatype?

Options:

a. Yes

b. No

Reveal Answer

8. What is the type of a Structure?

Options:

a. Reference Type

b. Value Type

Reveal Answer

9. What are the operators supported in C# not in VB.Net?

Options:

a. ++, --

b. ? :, <<, >>

c. ==, sizeof

d. All the above

Reveal Answer

10. How to iterate loop infinitely?

Options:

a. set condition (true)

b. set condition (false)

c. Both

Reveal Answer

11. What are Optional Parameters?

Options:

a. Every optional argument in the procedure definition must specify a default value.

b. The default value for an optional argument must be a constant expression.

c. Every argument following an optional argument in the procedure definition must also be optional.

d. All the above

Reveal Answer

12. Can we mention Parameter Array as a first parameter for a given method?

Options:

a. Yes

b. No

Reveal Answer

13. What is the namespace required for StringBuilder Class?

Options:

a. System.Text

b. System.Object

Reveal Answer

14. How to typecast integer variable(n) to character variable(ch) and vice versa?

Options:

a. ch= (char) n n= (int) ch

b. Ch = n n = ch

c. char ch, int n ch = (int) n n = (char) ch

d. A, C

Reveal Answer

15. Can a method be overloaded based on return type?

Options:

a. Yes

b. No

Reveal Answer

16. Which of these is the right way to use Named Arguments in c sharp?

Options:

a. MethodCall(val1: 10, val2: 20)

b. MethodCall(val1 10, val2 20)

c. MethodCall(val1->10, val2->20)

d. None of the above

Reveal Answer

17. In method overloading, can we have two or methods with same name and different parameters?

Options:

a. Yes

b. No

Reveal Answer

18. Can we store multiple data types in System. Array?

Options:

a. Yes

b. No

Reveal Answer

19. What does ar.GetLength(0) returns if ar is an integer array?

Options:

a. return the number of elements in first dimension.

b. return the number of elements in second dimension.

c. returns the number of characters in the first element of the array.

Reveal Answer

20. When does the Runtime throw ArrayTypeMismatchException?

Options:

a. When you try to store a value of different data type that an array can store.

b. To store a value of sametype.

c. When we try to access an element of an array with an invalid index.

d. A and C

Reveal Answer

21. How can we get the number of elements in second dimension in Array?

Options:

a. Using Length(0)

b. Using Length(1)

c. Using GetLength (1)

d. Using GetLength (0)

Reveal Answer

22. How can we copy the values from existing array into a new Array of different size?

Options:

a. Using Array. Copy() method

b. Using Array .Clone() method

Reveal Answer

23. Can we change the Dimensions in of the Array in runtime?

Options:

a. Yes

b. No

Reveal Answer

24. Can we set the size of Arrays at run time?

Options:

a. Yes

b. No

Reveal Answer

25. Which Exception is Thrown if we are trying to access an element of array with Invalid Index?

Options:

a. IndexOutOfRangeException

b. NullException

c. InvalidException

d. ApplicationException

Reveal Answer

26. Select Case (...expression...) what are the valid DataTypes in SelectCase (expression) Statement?

Options:

a. integer

b. char

c. string

d. Above all

Reveal Answer

27. When do we need to do Explicit Casting?

Options:

a. When variable on RHS cannot be assigned to variable on LHS.

b. When variable on RHS can be assigned to variable on LHS.

c. When variable on LHS cannot be assigned to variable on RHS.

d. None

Reveal Answer

28. Byte can be implicitly assigned to ________ datatype.

Options:

a. int

b. char

c. string

d. All the above

Reveal Answer

29. Enum is used for _______

Options:

a. More reliability

b. More readability

c. Less readability

d. None

Reveal Answer

30. Strings are ___________ types

Options:

a. Reference

b. Value

c. Depends

d. Can't say

Reveal Answer

31. _______ is used for those applications which need frequent modification of strings.

Options:

a. Sytem.Text.StringBuilder

b. Sytem.Test.StringBuilder

c. Sytem.Text.String.Builder

d. Sytem.Text.StringModifier.

Reveal Answer

32. Strings in .NET are _______

Options:

a. Immutable

b. Mutable

c. Modifiable

d. None of the above

Reveal Answer

33. Floating point division with zero is ________

Options:

a. Runtime exception

b. Not a runtime exception

c. Compilation error

d. None

Reveal Answer

34. Which of these is a valid integer to string conversion in C#?

Options:

a. s = (string) n;

b. s = n.ToString ( );

c. s = string (n);

d. None of the above.

Reveal Answer

35. f is float type variable and dec is decimal type variable. Which casting is correct?

Options:

a. f= dec

b. dec = f

c. f= (float) dec

d. All the above

Reveal Answer

36. Which of declaration of arrays is valid

Options:

a. int [ ] ar=new int [10];

b. int [10] ar=new int [ ];

c. int [ ] ar=new int [ ];

d. All of the above

Reveal Answer

37. Is an Array a reference type and thus allocated on a heap?

Options:

a. Yes

b. No

Reveal Answer

38. Can “new” be used as a modifier that hides an inherited member that replaces base class version by derived version?

Options:

a. Yes

b. No

Reveal Answer

39. What will be the output of the following program? int a = 100; bool b; b = Convert.ToBoolean(a); Console.WriteLine("The value of b: " + b.ToString());

Options:

a. throws an exception as the value of a is 100 instead of 1

b. Prints: The value of b: False

c. Prints: The value of b: True

d. Prints: The value of b: Null

Reveal Answer

40. The base class for all classes in .NET Framework is: ________

Options:

a. System.Nullable

b. System.Object

c. System.String

d. System.Type

Reveal Answer

41. What will be the output of the following code: class Program { static void Main(string[ ] args) { Tests t = new Tests(7.8); } } class Tests { double p = 3.14; public Tests(double p) { Console.WriteLine("Value received is: "+p.ToString()); } }

Options:

a. Throws a compile error as the default constructor is not provided

b. Prints: Value received is: 7.8

c. Prints: Value received is: 3.14

d. Throws an error stating the variable “p” already contains a definition of p.

e. Throws an error stating an ambiguity of variable “p”.

Reveal Answer

42. What is wrong in the following command? class Tests { private int _balance; public int Balance { get {return _balance; } set { _balance = value; } } }

Options:

a. _balance must be public

b. Balance must be private

c. “value" is not declared

d. No Errors

Reveal Answer

43. All value types in Common Type System derive from ________.

Options:

a. System.Enum

b. System.ValueType

c. System.Int32

d. None of the above

Reveal Answer

44. Can you store the value: 1234 in variable of type byte?

Options:

a. Yes

b. No

Reveal Answer

45. What will be the output of the following program? static void Main (string[ ] args) { string str = "World"; Console.WriteLine("Hello {1}", str); }

Options:

a. Prints: Hello World

b. Prints: Hello {1}

c. Prints: Hello

d. Throws System.FormatException

Reveal Answer

46. _________ specifies how a member is accessible outside the class.

Options:

a. Polymorphism

b. Encapsulation

c. Inheritance

d. Method Overriding

Reveal Answer

47. Can we have a nested class (class within a class)?

Options:

a. Yes

b. No

Reveal Answer

48. Can we use access modifiers on an interface?

Options:

a. Yes

b. No

Reveal Answer

49. What will be the output of the following program? bool check; if (check = true) { Console.WriteLine("This is the result!"); }

Options:

a. Gives an error on the code editor for not using “==”

b. Throws an exception for assigning a value in if.

c. Prints: This is the result!"

d. Gives a blank output

Reveal Answer

50. What will be the output of the following program? static void Main(string[] args) { int num; string str="2+3"; bool result = Int32.TryParse(str, out num); Console.WriteLine("Result: " + result); }

Options:

a. Throws InvalidCastException

b. Prints: Result: 5

c. Prints: Result: True

d. Prints: Result: False

Reveal Answer

51. What will be the output of the following program? class Program { static void Main(string[] args) { ParamTest(1,2,3); } public static void ParamTest(int p, params int[] values) { int sum = 0; foreach (int x in values) sum += x; Console.WriteLine("The sum is: " + sum); } }

Options:

a. Throws InvalidCastException

b. Prints: The sum is: 1

c. Prints: The sum is: 6

d. Prints: The sum is: 0

e. Prints: The sum is: 5

Reveal Answer

52. What will be the output of the following program? class Program { static string x = "initial"; static void Main(string[] args) { x = TestMethod(out x); Console.WriteLine("x is: " + x); } static string TestMethod(out string n) { n = "changed"; Console.WriteLine("In TestMethod: " + x); return "new string"; } }

Options:

a. Prints: In TestMethod: initial x is: initial

b. Prints: In TestMethod: changed x is: initial

c. Prints: In TestMethod: initial x is: changed

d. Prints: In TestMethod: changed x is: new string

Reveal Answer

53. what will be the output of the following program? static void Main(string[] args) { int n = 1; switch(n) { case 1: case 2: Console.WriteLine("This is for case 2."); break; default: Console.WriteLine("This is for case n."); break; } }

Options:

a. Gives an error for the missing “break” statement.

b. Prints: This is for case 2.

c. Prints: This is for case n.

d. Will be a blank screen in output.

Reveal Answer

54. Which of the following is NOT an Arithmetic operator in C#.NET?

Options:

a. **

b. +

c. /

d. %

e. *

Reveal Answer

55. which of the following are NOT Relational operators in C#.NET? 1. >= 2. != 3. Not 4. <= 5. <>=

Options:

a. 1, 3

b. 2,4

c. 3,5

d. 4,5

e. None of these

Reveal Answer

56. Which of the following is NOT a Bitwise operator in C#.NET?

Options:

a. &

b. |

c. <<

d. ^

e. ~

Reveal Answer

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