Interview Questions

1. Generics in C#.Net is used to_________

Options:

a. Solve the problem of type safety

b. Reuse the code

c. Increase the performance

d. All the above

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2. The built-in collections found in the System.Collections namespace are________

Options:

a. A. Ordered collections

b. B. Indexed collections

c. C. Keyed collections

d. D. All the above

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3. How many types of collections are available in .net?

Options:

a. 2

b. 3

c. 4

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4. How to use Dictionary class in Systems.Collections.Generic?

Options:

a. Create a Dictionary object and populate it and enumerate it to display key value pairs.

b. Create collections object and populate them with values and create adictinary object.

c. Both A and B

d. None of the above

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5. Differences between hashtable and arraylist are:

Options:

a. Retrieving the data in arraylist is faster than retrieving the data in hashtable

b. Array list is a collection of objects and hashtable is a collection that takes key and corresponding values.

c. ArrayList Class implements the Icollection Interface where as Hashtable implemets the Idictinary Interface

d. All the above

Reveal Answer

6. _____________is the compiler's ability to infer which type arguments to use with a generic method, without specifying explicitly.

Options:

a. Multiple inference

b. Static type inference

c. Generic type inference

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7. Constraints in generics are used to__________

Options:

a. Add contextual information to type parameters

b. To limit the range of types

c. Add information about type arguments

d. All the above

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8. Which namespace has to be added for using generic list (List<T>, where T is datatype)in C# ?

Options:

a. System.Generic.Collections

b. System.Collections.Generic

c. System.Collections

d. All the above

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9. How to Serialize the generic types ?

Options:

a. Use GenericSerialize attribute

b. Use Serialize attribute

c. Use Obsolete attribute

d. None of the above

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10. You are creating an undo buffer that stores data modifications. You need to ensure that the undo functionality undoes the most recent data modifications first. You also need to ensure that the undo buffer permits storage of strings only. Which code segment should you use?

Options:

a. Stack<string> undoBuffer = new Stack<string>();

b. Stack undoBuffer = new Stack();

c. Queue<string> undoBuffer = new Queue<string>();

d. Queue undoBuffer = new Queue();

Reveal Answer

11. When you create an instance of a nested type, you must specify __________ for all enclosing generic types.

Options:

a. Type arguments

b. Variables

c. Methods

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12. What is the drawback of arraylist compared with Generic list?

Options:

a. Generic lists are faster than the arraylists

b. Using the generic class we can create the typesafe at runtime where as with arraylist we cannot.

c. Coding complexity with thearray list is more

d. All the above

Reveal Answer

13. Advantage of TrimToSize in araylist is ____________

Options:

a. We can increase the capacity of array list

b. We can decrease the capacity of array list

c. This is used to add another array to the arraylist

d. None of the above

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14. Default capacity of an array list is ___

Options:

a. 0

b. 1

c. 2

d. 4

e. 8

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15. Can we sort the items in a hash table?

Options:

a. Yes

b. No

c. Can’t say

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16. The disadvantage of arraylist and hashtable is________

Options:

a. Both are not typesafe

b. Both are type safe

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17. What is the main difference between accessing the members of an arraylist and a hastable? I. In arraylist retrieval of data is done on Index II. in arraylist the retrieval of data is based on <key> III. in Hash table the retrieval of data is based on <key> IV. In Hash table retrieval of data is done on Index

Options:

a. I and III

b. II and IV

Reveal Answer

18. Can an arraylist accept duplicate elements?

Options:

a. Yes

b. No

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19. In a Hashtable _ must be unique, but need not be unique.

Options:

a. Key, Value

b. Value,key

c. Value,list

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20. We can override the ToString() method

Options:

a. Yes

b. No

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21. IDictionary interface iss a ________ type of collection of key/value pairs.

Options:

a. Generic

b. Nongeneric

c. Both A and B

d. None of the above

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22. The following are the IDictionary methods:

Options:

a. Add

b. Clear

c. GetEnumerator

d. All the above

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23. Is dynamic "insertion" and "deletion" possible using Array?

Options:

a. Yes

b. No

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24. Can we disable connection pooling or is it a built in property like that can only be used?

Options:

a. Yes

b. No

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25. Every Collection is implemented from the Interface _______________

Options:

a. IDictionary

b. IArray

c. IEnumerable

d. None of the above

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26. How is IEnumerable and IEnumerator related?

Options:

a. IEnumerable does not have any relation with IEnumerator.

b. IEnumerator has a GetEnumerator method that returns an IEnumerable

c. IEnumerable has a GetEnumerator method that returns an IEnumerator

d. None of the above

Reveal Answer

27. What would be major difference between different types of collections?

Options:

a. The way the items are retrieved

b. The storage structure

c. Both a and b

d. None of the above

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28. The __________ namespace contains interfaces and classes that defines various collections of objects such as lists, queues, etc

Options:

a. System.Type

b. System.Tasks

c. System.Objects

d. System.Collections

Reveal Answer

29. A ___________ is an object which would manage other objects i.e array list, hash table, etc.

Options:

a. Class

b. Object

c. Collection

d. Task

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30. ___________ implements the IList interface

Options:

a. Stacklist

b. Arraylist

c. Queuelist

d. Hashtable

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31. Elements in arraylist can be accessed using an_____________

Options:

a. Integer index

b. Character index

c. Stack index

d. Decimal index

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32. __________ represents a collection of key/ value pairs.

Options:

a. Arraylist

b. Array table

c. Hashlist

d. Hashtable

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33. A Generic class is ______________ to any particular data type

Options:

a. specific

b. not specific

c. depends on whether the class is public or private

d. can't say

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34. Generic types enforce type compliance at ____________

Options:

a. compile time

b. run time

c. can't say

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35. The key/value pairs of the hash table stored in __________object

Options:

a. Value entry

b. Collections

c. DictionaryEntry

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36. What is the location of generic namespace API?

Options:

a. System.Generic

b. System.Collection

c. System.Collection.Generic

d. None of the above

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37. What is the use of constraints in Generics?

Options:

a. Applying restrictions to the type that can be used

b. It is used for method overloading

c. It is used to define a particular type

d. None of the above

Reveal Answer

38. What are the types of constraints in Generics?

Options:

a. Derivation constraint

b. Constructor constraint

c. Reference/Value type constraint

d. All the above

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39. What is a derivation constraint in Generic?

Options:

a. It is used with a “where” reserved keyword with a colon and particular interface

b. It is used with a “where” reserved keyword with a colon and new() default constructor

c. It is used with a “where” reserved keyword with a colon and a value type

d. None of the above

Reveal Answer

40. Can we define generic static methods in C#?

Options:

a. Yes

b. No

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41. What is the right way to define a generic delegate in C#?

Options:

a. public delegate void DelegateName(T t);

b. public delegate void DelegateName<T>(T t);

c. public delegate void DelegateName<T>(int t);

d. None of the above

Reveal Answer

42. Is serializing of generic types possible in C#?

Options:

a. Yes

b. No

Reveal Answer

43. Which of the following is a collection of key value pair? i) HashTable ii) List iii) Stack iv) SortedDictionary

Options:

a. i & ii

b. ii & iv

c. i & iv

d. iv Only

Reveal Answer

44. What is a List? i) It is a key value pair ii) It is an index based collection iii) List is a non-generic form of ArrayList iv) List is a generic form of ArrayList

Options:

a. ii & iv

b. ii only

c. iv only

d. i & ii

Reveal Answer

45. What is a Dictionary?

Options:

a. It is a non generic key value pair collection

b. It is a generic key value pair collection

c. It is a non generic index based collection

d. It is a generic key index based collection

Reveal Answer

46. What is a Queue?

Options:

a. It is a variable size First-in-first-out

b. It is a variable size Last-in-first-out

c. It is a fixed size First-in-first-out

d. It is a fixed size Last-in-first-out

Reveal Answer

47. What is a collection?

Options:

a. It is an object

b. It is a collection of instances of same type

c. There are generic and non generic versions of it

d. All the above

Reveal Answer

48. What is the use of HybridDictionary?

Options:

a. It is a collection that uses ListDictionary where the number of elements is unknown

b. Used for small collection

c. Can be switched to HashTable

d. All the above

Reveal Answer

49. What are the properties available in generic List class? i) Capacity ii) Count iii) Item iv) Exists

Options:

a. i &ii

b. i,ii&iii

c. ii,iv&iii

d. iii only

Reveal Answer

50. What are the methods available in generic List class?

Options:

a. AddRange

b. Clear

c. Find

d. Reverse

e. All the above

Reveal Answer

51. What is an IEnumerator interface?

Options:

a. Supports iteration

b. Used for non-generic collection

c. It is a base class for all non-generic enumerators

d. All the above

Reveal Answer

52. Which class does Sort method use to perform the operation?

Options:

a. Comparer

b. Search

c. None of the above

Reveal Answer

53. What is the advantage of using Peek method? I. It reads and removes the elements efficiently II. It reads the element without removing it III. It does not modify the queue IV. It modifies the queue

Options:

a. I,II

b. II,III

c. I,III

Reveal Answer

54. What will be returned by HashTable.GetHash method?

Options:

a. Hash code of the key

b. Hash code of the value

c. None of the above

Reveal Answer

55. What is the use of IEnumerator.Reset Method?

Options:

a. It is used to set the enumerator to the initial position

b. It is used to clear the collection

c. It is used to reset the time

d. Used for Resetting the values in the collection

Reveal Answer

56. Closely related data can be handled more efficiently in memory when grouped together into a ___________

Options:

a. Collection

b. Database

c. File

d. Class

Reveal Answer

57. Which of the following are benefits of the Collection

Options:

a. Collection have builtin sorting facility.

b. They provide best performance because they are indexed.

c. We have to manage memory of collections as we require.

d. Collections cannot be readonly or of fixed size.

e. We can easily iterate through the collection

Reveal Answer

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