General COM (Component Object Model) MCQs

1. IDispatch is an example of which kind of interface ?

2. Identify the incorrect statement :

3. How are ActiveX and COM related ?

4. An interface that can be seen everywhere the component is referenced, including a client application, is scoped as :

5. Which one is the best language to use for defining interfaces ?

6. Component objects always access other component objects :

7. Marshalling code is :

8. Identify the incorrect statement from the following :

9. Which method of the IDispatch interface is avoided through DispID binding ?

10. Which one is an incorrect statement regarding the requirements of an ActiveX control ?

11. In which case is marshalling code not used ?

12. Which one is not a type of identifier ?

13. IDL stands for :

14. You want to register a COM component named mydll.dll. Which one is the correct syntax for registering the component ?

15. Which is the base interface ?

16. Components can include :

17. How is the instancing property value of an externally creatable class different from a dependent object class ?

18. The component needs to be run in a separate space or separate thread from the client application.Which type of server would you use ?

19. An ActiveX control has persistent properties.Which interface must it implement ?

20. Which statement regarding marshalling code is not true ?

21. Which one is the only feature of COM ?

22. Which interface is used by a COM-using program to invoke a COM object's properties, methods and events by name ?

23. Under what registry key will the pathname of an out-of-process COM server be found ?

24. Which interface is for accessing type information ?

25. A proxy is :

26. The basic unit of thread safety in COM is called a :

27. How are interfaces versioned ?

28. IClassFactory is an example of which kind of interface ?

29. Which statement is incorrect regarding dispatch interfaces ?

30. Which statement regarding DCOM is incorrect ?

31. Which interface is to be implemented by a class which is designed especially to manufacture other COM objects ?

32. Which one is not a disadvantage of MIDL ?

33. What function can you use to add information about a type library to the system registry ?

34. IIDs are GUIDs that refer to :

35. What are the various types of marshalling ?

36. When a GUID is used to identify a COM object, it is known as a :

37. The LockServer method is used to :

38. Which is the incorrect statement about GUIDs ?

39. COM provides location transparency by :

40. What utility will you use to install and run servers remotely via DCOM ?

41. Which statement is incorrect regarding the IUnknown interface ?

42. The AddRef method of the IUnknown interface is :

43. How many bytes is a GUID ?

44. Which languages/tools can interact with COM through dispatch interfaces ?

45. How many different kinds of interfaces are there in COM?

46. Which one is not a feature of COM ?

47. Which interface must be supported by a COM object ?

48. MIDL stands for :

49. Identification of the COM object stored in the Windows registry is known as :

50. A component category is identified by :

51. Which approach to binding will result in the best performance ?

52. Which one is not an objective of COM ?

53. Which one is a COM interface for database access ?

54. Which statement is incorrect regarding the LockServer method ?

55. Identify the incorrect statement regarding vtables :

56. Which one is a disadvantage of MIDL ?

57. What technique does DCOM use to handle garbage collection of objects ?

58. Which are the methods of the IUnknown interface ?

59. Choose the false statement from the following regarding interfaces :

60. By which method of the IUnknown interface, can a client obtain pointers to other routines by requesting an interface pointer ?

61. The extension of a type library is :

62. An interface is :

63. Standard marshalling is provided by which file ?

64. If an object does not support a requested interface, QueryInterface returns:

65. Which statement is wrong about the benefits of type libraires ?

66. What is the mechanism used in COM to uniquely identify components ?

67. Following are some statements regarding interfaces. Which is the only incorrect one ?

68. Point out the incorrect statement regarding proxies :

69. The number of methods in the IUnknown interface is :

70. CLSID stands for :

71. Which compiled element does not run in-process ?

72. Which language does COM prescribe for the creation of components ?

73. Which statement is not true regarding interfaces ?

74. COM stands for :

75. A self-registering component is one :

76. What mechanism is provided by COM for reuse of code ?

77. The main goal of COM is :

78. How many fields does a HRESULT consist of ?

79. Which method would you use to create new GUIDs ?

80. GUID stands for :

81. When a GUID identifies an interface, it is known as a :

82. In which tool/language, can you make COM components ?

83. What is the similarity/relation between named pipes and DCOM ?

84. An interface that can be seen only in the class in which it is defined is scoped as :

85. A dual interface is one :

86. An interface that can be seen only within the object model or component in which it is defined is scoped as :

87. Identify the incorrect statement from the following :

88. The implementation of the interfaces is done through :

89. Which one is the correct statement regarding IDL ?

90. UDT stands for :

91. The threading model that defined a set of isolated but identical processing spaces for thread execution is called :

92. DCOM is an IPC mechanism.Here IPC stands for :

93. By which method of the IUnknown interface do clients dynamically discover at run-time whether or not an interface is supported by a component object ?

94. In which file is the Component Object Library implemented on Windows NT and Windows 95/98 ?

95. Which parameters do you have to pass to the CoCreateInstance function ?

96. COM calls it classes :

97. A stub is :

98. IID stands for :

99. Which one is a technology based on COM ?

100. Which COM interface supports automation ?

101. COM is not :

102. How many bits is a GUID ?

103. MTA stands for :

104. Other than DCOM, which other IPC mechanism can be used ?

105. DCOM is ideally suited to Internet technology for business applications. Which of the following would not support the above statement ?

106. Which is the incorrect statement regarding interfaces ?

107. CLSIDs are GUIDs that refer to :

108. Which interface is for accessing type libraries ?

109. IUnknown is an example of which kind of interface ?

110. As a COM programmer, by which method would you destroy a COM object ?