Dot Net 2.0 using C# Test Answers
·
1. Which of the following applies to
interface inheritance?
Answers:
• If a class implements an
interface, the implementation can be provided by a public member of a base
class.
• A class may
partially implement an interface by only declaring some of the members
• Interface
methods may be implemented so that they are NOT directly accessible using an
instance reference to the class
• Since interface
implementation methods can not be declared private,protected, or internal, they
are always accessible from any point in an application
2. Which of the following are true about using
ADO.NET DataSets and DataTables?
Answers:
• The connection
to the database must remain valid for the life of the data objects
• All tables in a
dataset must come from the same database.
• A given
instance of a DataTable can be in only one DataSet
• Changes made to multiple
tables within a DataSet can easily be extracted to a new DataSet which contains
only the changes
• Content from multiple
DataSets can easily be combined into a single DataSet that contains the net
result of all changes.
3. Which of the following are true about
Nullable types?
Answers:
• A Nullable type is a
reference type.
• A Nullable type
is a structure.
• An implicit conversion
exists from any non-nullable value type to a nullable form of that type.
• An implicit
conversion exists from any nullable value type to a non-nullable form of that
type.
4. Which of the following are true about
declarative attributes?
Answers:
• They must be inherited
from the System.Attribute.
• Attributes are instantiated
at the same time as instances of the class to which they are applied.
• Attribute
classes may be restricted only to be applied to application element types.
• By default, a given
attribute may be applied multiple times to the same application element.
5. What output will be generated by the
following code?
StringBuilder sb = new StringBuilder(10);
sb.AppendFormat("1234567890123");
Console.WriteLine(sb.Capacity);
Answers:
• 10
• 20
• Some value
equal to or larger than 13
• Int32.MaxValue
6. The term Encapsulation is most commonly
used to mean:
Answers:
• separating an item's
public interface from the actual implementation
• embedding
content as a resource into an executable program
• providing a
short summary description of complex operations
• a technique
using base and derived classes
7. Which of the following are true about
namespaces and assemblies?
Answers:
• A single
assembly may contain multiple namespaces
• The same
namespace may be used in multiple assemblies
• Namespaces may
be aliased to provide a shorthand notation for a fully qualified identifier
• All of the above
8. The framework provides three different
timer classes. Select the answer that properly matches the class with the
listed characteristic.
Answers:
• System.Threading.Timer
A simple timer which requires a delegate to be supplied for execution when the
timer expires. Execution of the method provided by the delegate will be invoked
on a ThreadPool Thread.
•
System.Timers.Timer: Designed for use with worker threads in a multithreaded
environment. Can move among threads to handle the raised Elapsed event May
result in more accuracy than the System.Windows.Forms.Timer instances.
•
System.Windows.Forms.Timer A lower resolution timer which requires a UI message
pump on the creating thread.
• All of the above
9. Transactions initiated in which of the
following are supported by System.Transactions infrastructure?
Answers:
• SQL Server
• ADO.NET
• MSMQ
• Microsoft
Distributed Transaction Coordinator (MSDTC).
• All of the above
10. Which of the following are required to be
true by objects which are going to be used as keys in a
System.Collections.HashTable?
Answers:
• They must
handle case-sensitivity identically in both the GetHashCode() and Equals()
methods.
• Key objects
must be immutable for the duration they are used within a HashTable.
• Get HashCode()
must be overridden to provide the same result, given the same parameters,
regardless of reference equalityl unless the HashTable constructor is provided
with an IEqualityComparer parameter.
• All of the above
11. When developing a managed client to be
used with an existing COM Component, __________.
Answers:
• you should modify the COM
component to enable CLR functionallity.
• you should use TlbImp.exe
to create a managed wrapper
• you should use
TlbExp.exe to create a managed wrapper
• you should
enable an unsafe code
12. Which of the following are true about
anonymous methods?
Answers:
• Anonymous methods have
access to the local state of the containing function member.
• An anonymous
method requires an explicit method signature
• An anonymous
method can impact the lifetime of local variables and parameters of the
containing function
• A struct may
not declare an anonymous method which directly references member fields
13. Elements in a
System.Collections.Specialized.OrderedDictionary are:
Answers:
• sorted by Key
• sorted by
Element
• not sorted
14. class Sample
{
public Sample(int x) { }
}
In the above code, which of the following
other class constructors can directly access the provided constructor?
Answers:
• public Sample() : this(1)
{ }
• public Sample()
: Sample(1) {}
• Both the above.
• One class
constructor can not directly access another constructor
15. Which of the following code samples will
cause a compilation error?
Answers:
• class
SampleClass {} class SampleClass<T> {}
• class
SampleClass<T> {} class SampleClass<T,U> {}
• class SampleClass<T>
where T : class { } class SampleClass<T> where T : struct { }
• class
SampleClass {} class SampleClass<T> where T : class { }
16. Which of the following are true about
statements?
Answers:
• A while statement will
always execute its body at least once.
• A for loop will
always execute its body at least once.
• A try statement
must always include at least one catch block
• A case clause
within a switch statement may not fall through to the next case clause
17. If two assemblies contain the same fully
qualified class, which of the following will be true?
Answers:
• It is impossible to add a
reference to both assemblies to any given assembly
• A new root can
be added to the assemblies namespace hierarchy by the use of an extern alias
• The specific
colliding name may be altered by using an extern alias
• The collision
may be avoided by using a statement to provide an alias
18. Which of the following are true about
delegates?
Answers:
• A delegate
requires an instance method be supplied.
• A delegate instance may
encapsulate only one method
• Delegates are
not typesafe
• A delegate
instance does not know or care about the class type of the encapsulated method
19. When Deleting a DataRow from the
DataRowCollection of a DataTable, you can:
Answers:
• use the
DataRowCollection.Remove method to immediately delete the row.
• use the
DataRowCollection.Remove method to mark the row for deletion when
DataRow.AcceptChanges is called.
• use the
DataRow.Delete method to immediately delete the row.
• use the
DataRow.Delete method to mark the row for deletion when DataRowAcceptChanges is
called.
20. Which access limitation does a class
member declared protected internal have?
Answers:
• Access is
limited to the containing class plus any classes derived from the containing
class
• Access is
limited to the current assembly
• Access is limited to the
containing class plus any classes derived from the containing class that are
also in the current assembly
• Access is
limited to the containing class plus any classes derived from the containing
class or any other class in the current assembly
21. In which of the following ways do structs
differ from classes?
Answers:
• Structs can not
implement interfaces
• Structs cannot inherit
from a base struct
• Structs cannot
have events interfaces
• Structs cannot
have virtual methods
22. Which of the following are true about
enums?
Answers:
• Enums are always equated
to an integral constant value
• A variable of
the enum type will always contain one of the declared symbolic constants
• The declared
values of an enum are always assigned sequential starting with 0
• The declared
values of an enum must be mapped (explicitly or implicitly) to unique integral
values
23. Which of the following are characteristics
of the System.Threading.Timer class?
Answers:
• The method provided by the
TimerCallback delegate will always be invoked on the thread which created the
timer.
• The thread
which creates the timer must have a message processing loop (i.e. be considered
a UI thread)
• The class
contains protection to prevent reentrancy to the method provided by the
TimerCallback delegate
• You can receive
notification of an instance being Disposed by calling an overload of the
Dispose method.
24. Custom non-fatal exceptions should be
derived from:
Answers:
• ApplicationException
•
DataMisalignedException
•
ExecutionEngineException
• SystemException
25. Which of the following are defined as a
"token"?
Answers:
• Identifier
• Whitespace
• Punctuator
• Operator
• All of the
above
26. Of which elements does Generics allow
parameterization by type?
Answers:
• Classes
• Structs
• Methods
• Fields
27. To which of the following can
System.IO.IsolatedStorage not be scoped?
Answers:
• Restricted to a
Specific Application
• Restricted to a
Specific AppDomain
• Restricted to a
Specific User
• Restricted to a specific
Physical Media
28. When using the Demand method of
System.Security.IPermission, which of the following will occur?
Answers:
• The permissions
of the code which invoked the Demand method will be evaluated.
• For permissions
which do a stack walk, an exception will occur only if NONE of the calling
codes has the required permission
• For permissions which do a
stack walk, an exception will occur if ANY of the calling codes does not have
the required permission
• The permission
levels of individual stack frames are always checked regardless of the
permission type.
29. Which of the following are true about
event handling?
Answers:
• One method may
handle events from different sources
• A single event can be
handled by multiple methods
• Event handlers
can be dynamically added and removed at runtime
• All of the
above
30. Which of the following conditions are true
regarding System.Diagnostics.Trace?
Answers:
• Trace is enabled for both
Release and Debug initial configurations
• Trace can be
controlled both by preprocessor directives, and compiler directives
• To change the
severity levels which generate output, you must recompile your program
• All of the
Above
31. Parameterized Properties in C#
are__________.
Answers:
• not supported except for
implementing an indexer.
• properties
which take one or more parameters (e.g. to retrieve one element from a member
collection)
• properies which
use one or more attributes to control their behavior
• properties
which can be passed as Method Parameters so they can be invoked by the called
method.
32. Determining the availability of sufficient
memory for an operation can be accomplished by?
Answers:
• There is no
supported application level means to determine if a specific amount of memory
is available.
• using static
methods of System.Runtime.MemoryFailPoint and checking the return value
• creating an instance of
System.Runtime.MemoryFailPoint and monitoring for an
InsufficientMemoryException
• creating an
instance of System.Runtime.MemoryFailPoint and monitoring for an
OutOfMemoryException
33. What will be the output generated by the
following code?
string t = "This Is a Test";
t.Replace("T", "?");
Console.WriteLine(t);
Answers:
• ?his Is a ?est
• ?his Is a ?es?
• This Is a Test
• ?his Is a Test
34. Which of the following are true about
operator precedence?
Answers:
• The Conditional Operator
(?:) has the lowest precedence.
• All binary
operators are left-associative, and evaluate from left to right.
• The Assignment
and Conditional Operators are right-associative.
• The Conditional
And (&&) and Or (||) operators have higher precedence than the Logical
And (&) and Or (|) operators.
35. Which of the following can Interfaces
contain?
Answers:
• Methods
• Properties
• Fields
• Conversion operators
• Events
36. Which of the following is a primary
characteristic of System.Xml.XmlDataDocument?
Answers:
• It provides
synchronized operations viewing the content either as an XmlDocument or as a
DataSet
• It provides the
basic abilities for XMLDocument instances to be created from or exported to
DataSets
• It provides a
limited set of capabilities compared to the System.Xml.XmlDocument class
• It provides the basic
abilities to allow DataSets to be loaded from or exported to XML files.
37. Which of the following are true about pointers?
Answers:
• C# does not
support the use of "*" to indicate a pointer.
• Pointers are a
type derived from System.Object
• Pointers can be
used as out and ref type parameters
• Pointer
references are tracked by the garbage collector.
38. Which of the following operators can be
overloaded?
Answers:
• Assignment (=)
• Conditional
(&&,||)
• Logical
(&,|,^)
• Shift
(<<, >>)
39. Which of the following is not a valid
value for DataRowState?
Answers:
• Added
• Modified
• Dirty
• Detached
• Deleted
40. With which class is the task of mapping a
specific point in time into units, such as weeks, months, and years accomplished?
Answers:
• System.DateTime
• System.TimeSpan
•
System.Globalization.Calendar
•
System.Globalization.CultureInfo
41. Which of the following is NOT a valid C#
preprocessor directive?
Answers:
• #define
• #line
• #include
• #error
• #pragma
42. Which of the following are valid as the
underlying type for an enumeration?
Answers:
• int
• sbyte
• long
• All of the
above
43. Which of the following can an interface
NOT contain?
Answers:
• Methods
• Events
• Fields
• Indexers
44. Which of the following is true about
exceptions?
Answers:
• Exceptions
should be derived from the System.Exception, but are not required to do so.
• If no catch
block is found for an exception, and the source is not a static constructor, a
System.ThreadException will be thrown
• Mathematical
errors such as divide by zero, or numeric overflow will generate an exception
that is derived from System.Exception
• Every throw
statement must have at least one catch block
45. Which of the following are true about
using the System.Messaging.MessageQueue class?
Answers:
• It provides
communication across heterogeneous networks
• It provides
communication when one of the endpoints may be off-line
• It may behave
differently depending on the current operating system
• A new system
level queue may be created simply by creating an instance of MessageQueue.
46. Which of the following characteristics are
found in an iterator?
Answers:
• It is a
statement block which may contain a yield return statement to provide the next
value of the iteration
• It is a
statement block which may contain a yield break statement to provide the next
value of the iteration
• It is a
statement block which may contain a yield return statement to indicate that the
iteration is complete
• It is a
statement block which may contain a yield break statement to indicate that the
iteration is complete
• It is a class
which implements Ienumerable
47. Which of the following are true for
parameters?
Answers:
• Changes to
value parameters always involve making a copy of the original argument
• Items passed as
Reference Parameters must be initialized prior to the call
• Output
Parameters do not need to be assigned inside the method
• Variable Length
argument lists are not supported
48. Which of the following can one perform to
create a System.Type instance for a given specialization of a generic?
Answers:
• Call the
Type.MakeGenericType() method on an instance of System.Type which represents
the Generic, specifying the types of the generic parameters.
• Call the static
Type.MakeGenericType(...) method specifying both the base type and the types of
the generic parameters.
• Call the
GetType() method on an instance of the specialization
• Call
Reflection.Emit()
• Call the
Type.GetGenericTypeDefinition() method
49. Which of the following is false regarding
arrays?
Answers:
• For reference
types A and B; if a conversion from A to B exists, a conversion from A[] to B[]
also exists
• For value types
A and B; if a conversion from A to B exists, a conversion from A[] to B[] also
exists
• Assignments to
arrays elements may require a runtime check to validate the type safety of the
assignment
50. Which of the following is an effect of
marking resources in satellite assemblies?
Answers:
• It renders the
resources unavailable.
• It ensures that
resources are used only with the appropriate culture
• It prevents
identifier collisions between multiple satellite assemblies
• It has no
impact since access specifiers for resources are not applied.
51. Which of the following are true with
respect to the standard implementation of Garbage Collection?
Answers:
• Objects must be
set to null in order to be eligible for garbage collection
• Unless specific
steps are taken, an object may be moved in memory
• Objects become
eligible for garbage collection as soon as it is impossible for any code to
access it
• Objects which
implement finalizers will always have the finalizer called at some point
52. Which of the following is true about
C# generics?
Answers:
• C# allows
non-type template parameters
• C# supports
explicit specialization
• C# allows the
type parameter to be used as the base class for the generic type
• C# allows a
generic type parameter itself to be a generic
• C# enforces
that all codes are valid for all types of parameters
53. Which System.Runtime.Remoting class is
used to store all relevant information required to generate a proxy in order to
communicate with a remote object?
Answers:
• ObjRef
•
MarshalByRefObject
• ObjectHandle
• RemotingServices
54. Which of the following characteristics is
found in The DateTime type?
Answers:
• It always
references the UTC (GMT) time
• It always
references the Local time
• It contains a
member indicating which time zone it refers to
• It contains a
member indicating whether it is UTC, Local, or Unspecified
55. Which of the following is NOT part of an
assembly?
Answers:
• Manifest
• MetaData
• Intermediate
Language Code
• Resources
• Native
Executable Code
56. Which of the following characteristics do classes
in the System.Drawing namespace such as Brush,Font,Pen, and Icon share?
Answers:
• They
encapsulate native resources and must be properly Disposed to prevent potential
exhausting of resources.
• They are Value
Type objects.
• You can inherit
from these classes to provide enhanced or customized functionality
• None of the
Above
57. Which of the following is not a valid
attribute for impacting serialization?
Answers:
•
DataContractAttribute
•
DataMemberAttribute
•
EnumMemberAttribute
• CollectionDataContractAttribute
•
DataObjectAttribute
58. Which of the following are true when
comparing built in types for equality?
Answers:
• Integral types
are considered equal if they represent the same value.
• Object types
are considered equal if they both refer to the same object or if both are null
• String types
are considered equal if they have identical lengths and identical characters in
each character position
• String types
are considered equal if they have identical dimensions and identical content at
each array index
59. Which of the following types guarantee
atomic reads and writes?
Answers:
• int
• double
• string
• long
• float
60. Which of the following characteristics are
found in overloaded methods?
Answers:
• They must have
the same name
• They must have
the same parameter signature
• They must have
the same access level
• None of the
above
61. Which of the following are typical steps
in creating a managed COM server component?
Answers:
• Assigning a
GUID to each exposed interface and implementation via the
System.Runtime.InteropServices.GuidAttribute
• Enabling an
unsafe code
• Registering the
server assembly with the system using RegAsm.exe
• Registering the
server assembly�with the system using RegSvc32.exe
62. Which of the following is NOT a
requirement for an application to be certified in the "Certified for
Windows Program"?
Answers:
• Usage of system
settings for size, color, and font
• Support for
Windows "High Contrast" option
• Usage of sound
to notify of critical information
• Keyboard only
access to all features including menus, and controls
63. Which of the following operations can NOT
be performed inside a catch block?
Answers:
• Prevention of
the caught exception from leaving the catch block
• Allowing the
original exception to propagate after it has been caught, with all of the
information (including context) intact
• Wrapping the
caught exception inside a newly created exception of a different type
• Generating a
new exception with no information about the original exception
• Altering the
Message , TargetSite and/or StackTrace, of the existing exception before
re-throwing
64. Which of the following is not a standard
service behavior supported by the System.ServiceProcess.ServiceController class
members?
Answers:
• Start
• Continue
• Pause
• Restart
65. Which of the following properties are
found in Static Constructors?
Answers:
• Static
constructors are called before the main program is executed
• Static
constructors are called before the first instance of a class is created
• Static
constructors are called before any static (non-constructor) members are called
• Static
constructors can take parameters
66. Which of the following types are derived
from System.Reflection.MemberInfo?
Answers:
•
System.Reflection.PropertyInfo
•
System.Reflection.EventInfo
• System.Type
•
System.Reflection.InstanceInfo
67. Which System.Runtime.Remoting class is
used store all relevant information required to generate a proxy in order to
communicate with a remote object?
Answers:
• ObjRef
• MarshalByRefObject
• ObjectHandle
•
RemotingServices
68. Which of the listed characteristics is
found in the following code sample?
[DllImport("msvcrt.dll")]
public static extern int
puts([MarshalAs(UnmanagedType.LPStr)] string m);
Answers:
• It physically includes
the native code for puts in the current assembly
• It generates a
wrapper class for the puts method
• It provides
sufficient information so the Platform Invoke functionality can be used to call
the function in the msvcrt.dll
• It enables an
unsafe code
69. Which of the following is not an
application entry point?
Answers:
• public static
void Main() {}
• public static
int Main() {}
• public static
int Main(string[] args) {}
• public static
int Main(string cmdline) {}
• private static
int Main(string[] args) {}
70. Which of the following does NOT apply to
XCOPY deployment?
Answers:
• The appropriate
version of the .NET framework must be installed.
• All application
components must be in the application directory, or a subdirectory.
• Shared
components can be installed as part of the XCOPY.
• XCOPY
deployment to a non-empty target directory may have unintended side-effects
71. Which of the following encodings are NOT
supported by classes in the System.Text namespace?
Answers:
• ASCII
• Unicode
• UTF-7
• UTF-8
• EBCDIC
