Tài liệu Phần thi trắc nghiệm ngôn ngữ C# docx

1.Which of the following statement about C# varialble is incorrect ?
A- A variable is a computer memory location identified by a unique name
B- A variable's name is used to access and read the value stored in it
C- A variable is allocated or deallocated in memory during runtime
D- A variable can be initialized at the time of its creation or later
2. The.……types feature facilitates the definition of classes ,structures and interfaces
over multiple files?
A- anonymous
B- partial
C- named
D- unamed
3. The …class is a variable-length array that can dynamically increase or decrease
in size?
A- ArrayList
B- Stack
C- Queue
D- SortedList
4. The.………interface defines methods to control the different generic collections?
A- ICollection .//
B- IDictionary
C- IEnumerator
D- Ilist
5. The default capacity of an ArrayList class is ?
A- 08
B- 16
C- 24
D- 32
6. in C# ………are created using delegates
A- exceptions
B- events
C- synchronization

D- threads
7. Which of the following code declare the delegate Calculation with the return type
and the parameter types as integer ?
A- public delegate int Calculation(int numOne,int numTwo);
B- pulic delegate Caculation(int numOne,int numTwo);
C- delegate int Caculation(int numOne,int numTwo);
D- delegate Caculation(int numOne,int numTwo);
8. The constructor initialises an object of the ArrayList class with the specified
initial capacity as the parameter .
A- ArrayList(String s)
B- ArrayList(ICollection)
C- ArrayList()
D- ArrayList(int)
9. Which of the following statements about the different data types in C# are
correct?
A- Value type variables store actual value and are stored on the heap.
B- Reference type variables store memory address of other variables in a stack .
C- Both, value and reference type variables can be built in or user defined data
types.
D- int and class are examples of value and reference type variables respectively.
10. Which piece of code display a float value as string ?
A. Float flotNum = 500.25F;
string stNum = flotNum.ToString();
Console.WriteLine(stNum);
B. float flotNum = 500.25F;
string stNum = flotNum.ToString();
Console.WriteLine(stNum);
C. float flotNum = 500.25F;
String stNum = flotNum.ToString();
Console.WriteLine(stNum);

D. float flotNum = 500.25F;
string stNum = flotNum.tostring();
Console.WriteLine(stNum);
11. An …….method is created when you instantiate or reference a delegate with a
block of code.
A- anonymous,named
B- named,anonymous
C- anonymous,unnamed
D- unnamed,anonymous
12. The … exception is thrown when the stack runs out of space while the.
… exception is thrown when the result of an arithmetic,casting or conversion
operation is larger in size than the destination object or variable.
A- OverFlowException, OutOfMemoryException
B- OutOfMemoryException, NullReferenceException
C- NullReferenceException, StackOverFlowException
D- StackOverflowException, OverflowException
13. What is the output of the following code ?
int num =5;
while(num>0)
{
if(num>4)
{
Console.WriteLine(num+"");
}
num;
if(num = =4)
{
Console.WriteLine("(0)",num);
}
if(num==3)

{
Console.WriteLine("{0}",num);
}
num ;
}
A- 532
B- 533
C- 542
D- 544
14. Which of the following statements about delegates are correct ?
Delegates are objects that contains references to methods that need to be invoked .
Delegates can be used to call any method identified during complication or runtime.
Delegates ,when invoked at runtime,execute the method identified at compile time.
Delegates can be associated with methods provided they have the same return type
and parameter type.
15. Managing memory and verifying code safety are functionalities of ……………
Common Language Runtime
.Net Framework Class Library
Common Language Specification
Common Type System
16. Restriction or constraints can be applied to type parameters by using
the keyword .
select
from
where
return
17. Which of the following statements about the different operator are correct ?
The Addition operator performs concatenation of strings if the operands are strings
The Boolean inclusive OR operator returns true if at least one the expression is true
The Conditional OR operator evaluates the second expression only if the first is true

The Relational operators return a boolean value depending on the comparison being
made
18. Which of the following statements about the partial class are correct ?
Partial classes are the only types in C# that support partial definitions
Partial classes can be defined over multiple locations to store different members
Partial classes allow storage of private members in one file and public in another
Partial classes allow multiple developers to work on separate sections simultaneously
19. Which of the following statements about System.Collections.Generic namespace
classes are correct ?
The List<T> class provides a generic collection of items that can be dynamically
resized
The LinkedList<T> implements the doubly linked list by storing elements in it
The Queue<T> provides a generic collection that follows the First-In-First-Out
principle
The Dictionary<K,V> provide a generic collection of sorted key and value pairs
20. The ……… class is a combination of the.……… and …………… class es.
Hashtable,ArrayList,SortedList
Hashtable,SortedList,Dictionary
SortedList,ArrayList,Dictionary
SortedList,Hashtable,ArrayList
21. Which of the following statements about the defferent types of C# statements
are correct ?
Selection statements help transfer the flew from one block to another in the
program.
Iteration statements help you to repeatedly execute a block of code within program .
Jump statements transfer control after they check whether a paricular condition is
true or false
Exception handling statements manage situation that hinder the normal execution of
the program.
22. The method of the ArrayList class copies the elements of a list to an array

while the method also copies elements of a list to an array of type Object.
Contains,TrimToSize
CopyTo,ToArray
TrimToSize,Contains
ToArray,TrimToSize
23. Which of the following statements about constraints on type parameters are
correct ?
The T:struct specifies that the type parameter must be of a value type only.
The T:new() specifies that the type parameter must be of a reference type such as a
class,interface or a delegate
The T:<base class name> specifies that the type parameter must be a parent class
or its successor.
The T:<interface name> specifies that the type parameter must be an interface or
should inherit an interface.
24. Which of the following statements about generic methods are correct ?
Generic methods process values whose data types are known only when they are
accessed
Generic methods are declared with the generic type parameter list enclosed within
angular.
Generic methods can be declared within generic or non generic class declaration.
Generic method bodies ,when declared within a non-generic class ,refer to the type
parameters of the method and class.
25. Can you re-arrange the steps given below to implement delegates in C# ?
Declare a delegate
Call method using the delegate object
Create method to be referenced by delegate
Instantiate the delegate
A. A B C D
B. A C D B
C. A D C B

D. A B D C
26. The SortedList class behaves like an if you access its elements based on
their index number otherwise it behaves like a
array,hash table
hash table,heap
heap,queue
queue,array
27. Which of the following statements about generics are correct ?
Generic are data structures that guard against reuse of defined C# data type
functionalities.
Generic allow you to reuse the code in a safe manner without casting or boxing.
Generics are parameterized data structures that can work with reference types only.
Generics always accept a type parameter,which is a placeholder for the required date
type.
28. Which of the following keywords are associated with iteration statements?
case
foreach
switch
while
29. Which of the following statements about C# are correct ?
C# applications can easily use or integrate code written in other .NET languages.
C# allows use of uninitialized variables as well as checks the overflow of types.
C# can be used to develop both,simple standalone and distributed application.
C# applications are easy to deploy because of its support for XML and SOAP.
30. …….are a kind of parameterized data structure that can work with value
types as well as reference types.
Iterators
ArrayList
Generics
Enumerator

31. A ……… is a set of items of same or different data types.
array
event
collection
list
32. The property of the System.Exception class returns the Exception instance
that caused the current exception.
Message
Source
StackTrace
InnerException
33. Exception thrown due to arithmetic operations or null object reference
are exceptions.
application-level
system-defined
system-level
user-defined
35. Exceptions thrown due to failure in database connection or network connection
are examples of exceptions
A. application-level
system-defined
system-level
user-defined
36. The … fields are accessible by other classes but.…… fields are accessible
only by the class in which they are declared.
A. public,private
B. private,protected
C. protected,internal
D. internal,public
37. The …… interface supports simple iteration over elements a generics ?

ICollection
IDictionary
IEnumerator
Ilist
38. The exception is thrown when a value is assigned null object .
OverflowException
OutOfMemoryException
NullReferenceException
StackOverFlowException
39. Which of the following statements about delegates in C# are correct?
A delegate can accept a block code as a parameter.
A delegate can invoke one method at a time.
A delegate can encapsulate static methods.
A delegate is declared using the delegate keyword
40. allow you to reuse a code for different data types.
IDictionary
LinkedList
Inheritance
Generics
41. Which of the following statements about exceptions are correct ?
The System.Exception class is the base class that allows you to handle all exception.
The System.Exception class contains methods that cannot be inherited by other
exception classes.
The System.Exception class can be inherited directly or indirectly by all other
exception.// phong doan
The System.Exception class contains properties that are common to all exceptions.
42. An method is an inline nameless block of code that can be passed as a
delegate parameter ?
anonymous
named

partial
unnamed
43. Which of the following statements about Visual Studio 2005 IDE key elements
are correct? (chon 1 dap an!)
The code Editor facilitates writing, display and aditing of form, event, and method
code.
The Dynamic help window provides a list of topics depending on the active IDE area
or task.
The properties window display compile time properties and events of objects at all
times
The Solution Explorer provides an organized view of projects and access tho their
commands.
44: Which of the following statements about expressions and statements are
correct?
Statements may or may not return values, but expressions always return values.
Statements end with semicolons but expressions do not end with semicolons.
Statements specify where to store computation results but expressions do not.
Compilers execute statements and since expressions are part of statements, they are
executed with them.
45: The Visual Studio 2005 … edition is a proper choice for students enthusiasts and
hobbyists? (chon 1 dap an!)
Team System
Professional
Standard
Express
46: The … class is a combination of the Hashtable class and the ArrayList class?
(chon 1 dap an!)
SortedList
Collection
List

Dictionary