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oop

Descripción

Test sobre oop, creado por Hello World el 20/01/2017.
Hello World
Test por Hello World, actualizado hace más de 1 año
Hello World
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Resumen del Recurso

Pregunta 1

Pregunta
1. C-style languages are
Respuesta
  • a) C, C#
  • b) C, C++
  • c) C, C#, C++
  • d) C, C#, C++, Java
  • e) C#, C++

Pregunta 2

Pregunta
2. Choose the incorrect statement for C style languages.
Respuesta
  • a) semicolons are not used to denote the end of a statement
  • b) curly brackets are used to group statements
  • c) variables are assigned using an equals sign, but compared using two consecutive equals sign
  • d) square brackets are used with arrays
  • e) a, b, c, d

Pregunta 3

Pregunta
3. Which aspects does variable have?
Respuesta
  • a) type, size and memory address
  • b) memory address, type and value
  • c) type and value
  • d) value, size and memory address

Pregunta 4

Pregunta
4. What declaration of variables is the correct?
Respuesta
  • a) char c;i;
  • b) int b;c;
  • c) char c, char s;
  • d) double a, b;

Pregunta 5

Pregunta
5. Declaration of variable is not a statement of C# language, but ends with semicolon.
Respuesta
  • True
  • False

Pregunta 6

Pregunta
6. Declaration of variable is a statement of C# language.
Respuesta
  • True
  • False

Pregunta 7

Pregunta
7. Which rule is correct when naming variables?
Respuesta
  • a) the first character must be letters, underscore only
  • b) an identifier can consist of letters, number and reserved words
  • c) reserved words can be used as variable names
  • d) the first character must be only letter

Pregunta 8

Pregunta
8. C# is case sensitive language.
Respuesta
  • a) yes
  • b) no
  • c) it depends on data type

Pregunta 9

Pregunta
9. Choose the correct statement with initializing.
Respuesta
  • a) string c="0";
  • b) int i="0";
  • c) char c="0";
  • d) int i='0';

Pregunta 10

Pregunta
10. What method in C# is Console output?
Respuesta
  • a) ReadLine
  • b) WriteLine

Pregunta 11

Pregunta
11. What method in C# is Console input?
Respuesta
  • a) ReadLine
  • b) WriteLine

Pregunta 12

Pregunta
12. The result in Console application of this code will be? int a=8, b=2, c=0; c=a+b; Console.WriteLine(“{0}+{1}={2}”,b,a,c);
Respuesta
  • a) 2+8=10
  • b) 8+2=10
  • c) 10=2+8
  • d) 10=8+2

Pregunta 13

Pregunta
13. Choose the incorrect assignment? int i,j;
Respuesta
  • a) i=j=1;
  • b) i=10,j=10;
  • c) i=(j=10);
  • d) a, b, c

Pregunta 14

Pregunta
14. What will be the result? int i=5; int j=1; int x=(j--)+(--i);
Respuesta
  • a) x=6;
  • b) x=5;
  • c) x=7;
  • d) x=8;

Pregunta 15

Pregunta
15. What will be the result? int x=10,i=0,j=2; x+=(i-j);
Respuesta
  • a) 14
  • b) 10
  • c) 12
  • d) 8

Pregunta 16

Pregunta
16. The “for” statement can be an infinite loop.
Respuesta
  • True
  • False

Pregunta 17

Pregunta
17. Choose the incorrect For statement?
Respuesta
  • a) for(;;){}
  • b) for( int x = 0, x<= 100; x++){}
  • c) int x = 0; for(; x<= 100; x++){}
  • d) a,b,c

Pregunta 18

Pregunta
18. The statements bodies of the “for” and “while” operators might never be executed.
Respuesta
  • True
  • False

Pregunta 19

Pregunta
19. The statements bodies of the “for” and “while” operators must be executed at least once.
Respuesta
  • True
  • False

Pregunta 20

Pregunta
20. The statements bodies of the “for” and “foreach” operators might never be executed.
Respuesta
  • True
  • False

Pregunta 21

Pregunta
21. The statements bodies of the “for” and “foreach” operators must be executed at least once.
Respuesta
  • True
  • False

Pregunta 22

Pregunta
22. In what statement the Statements body is always executed at least once?
Respuesta
  • a) for, do while, while
  • b) do while
  • c) foreach, while
  • d) do while, for

Pregunta 23

Pregunta
23. C# classes contain:
Respuesta
  • a) properties and functions
  • b) data members(field, variables), properties and methods
  • c) method, functions and constructors
  • d) variables and methods

Pregunta 24

Pregunta
24. The properties in C# classes are…
Respuesta
  • a) procedures and functions
  • b) constructors
  • c) data members(variables)
  • d) members with get and set

Pregunta 25

Pregunta
25. C# procedure specifies with …
Respuesta
  • a) this keyword
  • b) void keyword
  • c) return data type
  • d) static keyword

Pregunta 26

Pregunta
26. An object is …
Respuesta
  • a) a property of the class
  • b) an instance of the class
  • c) a method of the class
  • d) a data member of the class

Pregunta 27

Pregunta
27. The classes are like new data types.
Respuesta
  • True
  • False

Pregunta 28

Pregunta
28. Access modifiers are ...
Respuesta
  • a) void and return data types
  • b) public and private
  • c) data types
  • d) this and static keywords

Pregunta 29

Pregunta
29. A public method with the same name as the class with no return type is ...
Respuesta
  • a) constructor
  • b) function
  • c) procedure
  • d) property

Pregunta 30

Pregunta
30. Procedures and constructors can’t be passed any arguments.
Respuesta
  • True
  • False

Pregunta 31

Pregunta
31. Functions can’t be passed any arguments.
Respuesta
  • True
  • False

Pregunta 32

Pregunta
32. Functions can be passed any arguments.
Respuesta
  • True
  • False

Pregunta 33

Pregunta
33. Procedures can’t be passed any arguments.
Respuesta
  • True
  • False

Pregunta 34

Pregunta
34. Procedures can be passed any arguments.
Respuesta
  • True
  • False

Pregunta 35

Pregunta
35. Methods can be passed any arguments.
Respuesta
  • True
  • False

Pregunta 36

Pregunta
36. Methods can’t be passed any arguments.
Respuesta
  • True
  • False

Pregunta 37

Pregunta
37. The default constructor is a method with …
Respuesta
  • a) any arguments
  • b) no arguments

Pregunta 38

Pregunta
38. In the static method must be absent “this” reference, as such method doesn’t work with any object.
Respuesta
  • True
  • False

Pregunta 39

Pregunta
39. In the static method allowed immediate call only other instance methods.
Respuesta
  • True
  • False

Pregunta 40

Pregunta
40. The “this” keyword can be used for...
Respuesta
  • a) methods
  • b) functions and procedures
  • c) constructors
  • d) a, b, c

Pregunta 41

Pregunta
41. Choose the correct declaration of array.
Respuesta
  • a) int[] a = int[10];
  • b) int[] c = new int[10];
  • c) int[] a = new [10];
  • d) a, b, c

Pregunta 42

Pregunta
42. Choose the correct declaration of jugged array.
Respuesta
  • a) int [][] j = new int[];
  • b) int [][] j = new int[][5];
  • c) int [][] j = int [5][5];
  • d) int [][] j = new int[5][];

Pregunta 43

Pregunta
43. Choose the correct declaration and initialization of array.
Respuesta
  • a) int[] a = new int[5]{1,5,8,4,5};
  • b) int[] a = {1,5,8,4,5};
  • c) a,b
  • d) there is no correct answer

Pregunta 44

Pregunta
44. Choose the correct declaration of two-dimensional array.
Respuesta
  • a) int[][] a = new int [2][5];
  • b) int [] a = new int [2][5];
  • c) int [,] a = new int[2,5];
  • d) int[,] a = new int[2][5];

Pregunta 45

Pregunta
45. The last unit (element) index of array is…
Respuesta
  • a) 0
  • b) 10
  • c) length
  • d) length-1

Pregunta 46

Pregunta
46. How many elements does the next array include? Int[] a=new int[77];
Respuesta
  • a) 76
  • b) 77
  • c) 78

Pregunta 47

Pregunta
47. How many elements does the next array include? Int[] a=new int[100];
Respuesta
  • a) 99
  • b) 100
  • c) 101

Pregunta 48

Pregunta
48. C# function specifies with …
Respuesta
  • a) this keyword
  • b) void keyword
  • c) return data type
  • d) static keyword

Pregunta 49

Pregunta
49. The statements body of the “do while” operator might never be executed.
Respuesta
  • True
  • False

Pregunta 50

Pregunta
50. The statements body of the “do while” operator must be executed at least once.
Respuesta
  • True
  • False

Pregunta 51

Pregunta
51. Choose the correct assignment? int i,j;
Respuesta
  • a) i,j=8;
  • b) i=8,j=8;
  • c) i=(j=8);
  • d) a,b,c;

Pregunta 52

Pregunta
52. Constructors can’t be passed any arguments.
Respuesta
  • True
  • False

Pregunta 53

Pregunta
53. Constructors can be passed any arguments.
Respuesta
  • True
  • False

Pregunta 54

Pregunta
54. Default constructors can’t be passed any arguments.
Respuesta
  • True
  • False

Pregunta 55

Pregunta
55. Default constructors can be passed any arguments.
Respuesta
  • True
  • False

Pregunta 56

Pregunta
56. How many elements does the next array include? int[] a=new int[99];
Respuesta
  • a) 99
  • b) 100
  • c) 101

Pregunta 57

Pregunta
57. Choose the core principles of OOP
Respuesta
  • a) Encapsulation and Inheritance
  • b) Encapsulation, Inheritance and Polymorphism
  • c) encapsulation and polymorphism
  • d) encapsulation, inheritance, polymorphism, aggregation and composition

Pregunta 58

Pregunta
58. Hiding an object’s internal implementation detail is…
Respuesta
  • a) encapsulation
  • b) inheritance
  • c) polymorphism
  • d) composition

Pregunta 59

Pregunta
59. Which concept promotes code reuse?
Respuesta
  • a) encapsulation
  • b) inheritance
  • c) polymorphism
  • d) composition

Pregunta 60

Pregunta
60. Which statement shows Encapsulation concept?
Respuesta
  • a) string s = “Hello World!”;
  • b) int a,b=0;
  • c) b++;
  • d) string s = “hello”, bool i=s.Equals(“!”);

Pregunta 61

Pregunta
61. Closely related to the notion of encapsulating programming logic is the idea of…
Respuesta
  • a) overriding
  • b) data protection
  • c) overloading
  • d) realization

Pregunta 62

Pregunta
62. Which access modificator (s) related to the data protection?
Respuesta
  • a) public
  • b) protected
  • c) private
  • d) private and protected

Pregunta 63

Pregunta
63. Members of a class that represent an object’s state should not be marked as
Respuesta
  • a) public
  • b) private
  • c) protected

Pregunta 64

Pregunta
64. Choose traditional technique to encapsulate class’s data.
Respuesta
  • a) Define default constructor
  • b) Define your own constructor
  • c) Define a pair of public accessor(get) and mutator(set) methods
  • d) Mark the data of class as public

Pregunta 65

Pregunta
65. Choose a technique to encapsulate class’s data
Respuesta
  • a) Define fields of class
  • b) Define your own constructor
  • c) Define a public properties
  • d) Define a private properties

Pregunta 66

Pregunta
66. The “Black boxing programming” term is related to
Respuesta
  • a) inheritance
  • c) objects
  • b) encapsulation
  • d) polymorphism

Pregunta 67

Pregunta
67. A “get” method …
Respuesta
  • a) returns the current value of state data
  • b) returns the default value of state data
  • c) allows to change the current value of state data
  • d) allows to change the methods of class

Pregunta 68

Pregunta
68. A “set” method …
Respuesta
  • a) returns the current value of state data
  • b) returns the default value of state data
  • c) allows to change the current value of state data
  • d) allows to change the methods of class

Pregunta 69

Pregunta
69. Is it possible to perform any internal logic necessary before making the value assignment in properties of class?
Respuesta
  • a) yes
  • b) no

Pregunta 70

Pregunta
70. Which keyword is related to the "get" block of property?
Respuesta
  • a) value
  • b) return
  • c) this
  • d) public

Pregunta 71

Pregunta
71. Which keyword is related to the "set" block of property?
Respuesta
  • a) value
  • b) return
  • c) this
  • d) public

Pregunta 72

Pregunta
72. Inheritance of OOP facilities ...
Respuesta
  • a) data protection
  • b) data hiding
  • c) code reuse

Pregunta 73

Pregunta
73. Classical inheritance is …
Respuesta
  • a) a model of “is-a” relationship
  • b) a model of a “has-a” relationship

Pregunta 74

Pregunta
74. The parent class is
Respuesta
  • a) a child class
  • b) a derived class
  • c) a base class

Pregunta 75

Pregunta
75. The extending classes are formally termed...
Respuesta
  • a) child classes
  • b) parent classes
  • c) base classes

Pregunta 76

Pregunta
76. What role of parent class?
Respuesta
  • a) define all the common data and members for the classes that extend it
  • b) define all the common methods for the classes that extend it
  • c) define all the common data for the classes that extend it
  • d) define all the common properties and functions for the classes that extend it

Pregunta 77

Pregunta
77. A child class inherits the constructor of a parent class.
Respuesta
  • True
  • False

Pregunta 78

Pregunta
78. Which members can never be accessed from parent class?
Respuesta
  • a) public members
  • b) private members
  • c) protected members
  • d) private and protected

Pregunta 79

Pregunta
79. (?)Is it possible to build multiple inheritance for classes in C# language ?
Respuesta
  • a) yes
  • b) no

Pregunta 80

Pregunta
80. Which classes cannot have its child classes?
Respuesta
  • a) public classes
  • b) sealed classes
  • c) private classes
  • d) derived classes

Pregunta 81

Pregunta
81. Which members of parent class cannot be accessed to other classes, but can be accessed to its child classes?
Respuesta
  • a) all members
  • b) public members
  • c) private members
  • d) protected members

Pregunta 82

Pregunta
82. Another use of the "this" keyword is to design a class using a technique termed…
Respuesta
  • a) constructor definition
  • b) constructor creation
  • c) constructor chaining
  • d) constructor using

Pregunta 83

Pregunta
83. The "base" keyword refers to …
Respuesta
  • a) the parent class
  • b) the child class
  • c) derived class

Pregunta 84

Pregunta
84. The process termed "method overriding" is …
Respuesta
  • a) a way for base classes to define as own version of a method defined by its parent class
  • b) a way for child classes to define its own version of a method defined by its derived class
  • c) a way for parent classes to define its own version of a method defined by its child class
  • d) a way for child classes to define its own version of a method defined by its parent class

Pregunta 85

Pregunta
85. A virtual method of a parent class must be overridden for by each derived classes.
Respuesta
  • True
  • False

Pregunta 86

Pregunta
86. A virtual method of a parent class must not be overridden for by each derived classes.
Respuesta
  • True
  • False

Pregunta 87

Pregunta
87. A virtual method of a parent class has its own implementation body block.
Respuesta
  • True
  • False

Pregunta 88

Pregunta
88. A virtual method of a parent class has not its own implementation body block.
Respuesta
  • True
  • False

Pregunta 89

Pregunta
89. An abstract method of a parent class has its own implementation body block.
Respuesta
  • True
  • False

Pregunta 90

Pregunta
90. An abstract method of a parent class has not its own implementation body block.
Respuesta
  • True
  • False

Pregunta 91

Pregunta
91. An abstract method of a parent class must be overridden for by each child class.
Respuesta
  • True
  • False

Pregunta 92

Pregunta
92. An abstract method of a parent class must not be overridden for by each child class.
Respuesta
  • True
  • False

Pregunta 93

Pregunta
93. Which feature is not related to an abstract class?
Respuesta
  • a) it is impossible to create an instance(object) of an abstract class
  • b) all abstract methods and properties of a basic class have not to be realized in a derived class
  • c) the abstract class may contain both abstract and common methods/properties
  • d) all abstract methods and properties of a basic class have to be realized in a derived class

Pregunta 94

Pregunta
94. An interface is defined using...
Respuesta
  • a) the capital letter “I” in the name
  • b) the interface keyword
  • c) the abstract keyword
  • d) the virtual keyword

Pregunta 95

Pregunta
95. An interface defines …
Respuesta
  • a) the method signature
  • b) the virtual methods
  • c) the common methods
  • d) the abstract methods

Pregunta 96

Pregunta
96. Classes that implement an interface are contractually required to implement the interface signature definition and can’t alter it.
Respuesta
  • True
  • False

Pregunta 97

Pregunta
97. A class can support as many interfaces as necessary.
Respuesta
  • True
  • False

Pregunta 98

Pregunta
98. A class can support only one interface.
Respuesta
  • True
  • False

Pregunta 99

Pregunta
99. A class cannot support as many interfaces as necessary.
Respuesta
  • True
  • False

Pregunta 100

Pregunta
100. "Has-a" relationship is ...
Respuesta
  • a) traditional form of code reuse in the world of OPP
  • b) another form of code reuse in the world of OOP
  • c) traditional form of data protection in the world of OOP
  • d) another form of data protection in the world of OOP

Pregunta 101

Pregunta
101. "Has-a" relationship commonly includes ...
Respuesta
  • a) encapsulation and composition terms
  • b) aggregation and polymorphism terms
  • c) polymorphism and composition terms
  • d) aggregation and composition terms

Pregunta 102

Pregunta
102. "Has-a" relationship must establish parent/child relationships.
Respuesta
  • True
  • False

Pregunta 103

Pregunta
103. The "has-a" relationship allows one class to define a member variable of another class and expose its functionality (if required) to the object user indirectly.
Respuesta
  • True
  • False

Pregunta 104

Pregunta
104. The .NET Framework allows to work with graphics using the ...
Respuesta
  • a) System.Drawing namespace
  • b) System.IO namespace
  • c) System.Windows.Form namespace
  • d) System.Data namespace

Pregunta 105

Pregunta
105. Which class is used to draw lines, curves and shapes?
Respuesta
  • a) The Brush class
  • b) The Pencil class
  • d) The Region class
  • c) The Pen class

Pregunta 106

Pregunta
106. Which class is used to fill shapes?
Respuesta
  • a) The Brush class
  • b) The Pencil class
  • c) The Pen class
  • d) The Region class

Pregunta 107

Pregunta
107. Choose the correct code to specify the location of control?
Respuesta
  • a) button1.Size = new Size(10,10);
  • b) button1.Location = Point(10,10);
  • c) button1.Location(10,10);
  • d) button1.Location = new Point(10,10);

Pregunta 108

Pregunta
108. Choose the correct code to specify the size of control?
Respuesta
  • a) button1.Size = new Size(10,10);
  • b) button1.Location = Point(10,10);
  • c) button1.Location(10,10);
  • d) button1.Location = new Point(10,10);

Pregunta 109

Pregunta
109. Which properties of controls can be used to specify its location?
Respuesta
  • a) Size
  • b) Left, Right, Top, Bottom
  • c) ForeColor and BlackColor
  • d) Left, Right

Pregunta 110

Pregunta
110. Drawing begins with the ...
Respuesta
  • a) System.Drawing.Pen class
  • b) System.Drawing.Graphics class
  • c) System.Drawing.Brush class
  • d) System.Drawing.Image class

Pregunta 111

Pregunta
111. To use Draw methods of the graphic object, we must provide an instance of the Pen class.
Respuesta
  • True
  • False

Pregunta 112

Pregunta
112. To use Draw methods of the graphic object, we must provide an instance of the Brush class.
Respuesta
  • True
  • False

Pregunta 113

Pregunta
113. Graphics.DrawLines, Graphisc.DrawPolygon, and Graphics.DrawRectangles accept arrays as parameters to allow us to create more complex shapes.
Respuesta
  • True
  • False

Pregunta 114

Pregunta
114. To use Fill methods of the graphic object, we must provide an instance of the Brush class.
Respuesta
  • True
  • False

Pregunta 115

Pregunta
115. To use Fill methods of the graphic object, we must provide an instance of the Pen class.
Respuesta
  • True
  • False

Pregunta 116

Pregunta
116. What method returns a String array containing the substrings in this instance that are delimited by elements of a specified char array or string array? Answer: Split!
Respuesta
  • True
  • False

Pregunta 117

Pregunta
117. An enumerated type is declared using the … keyword. Answer: Enum
Respuesta
  • True
  • False

Pregunta 118

Pregunta
118. By default, the first enumerator has the value…
Respuesta
  • 0
  • 1
  • 2
  • 9

Pregunta 119

Pregunta
119. C# structures are created with … keyword.
Respuesta
  • struct
  • new
  • is

Pregunta 120

Pregunta
120. Virtual methods are defined in …
Respuesta
  • Parent class
  • Child class

Pregunta 121

Pregunta
121. What big advantage of using interfaces ?
Respuesta
  • Is that class can implement multiple interfaces;
  • Is that class can not implement multiple interfaces;

Pregunta 122

Pregunta
122. Is it enough to create polymorphic methods using the "virtual" and "override" keywords?
Respuesta
  • True
  • False

Pregunta 123

Pregunta
123. Inheritance allows to build …
Respuesta
  • a dependency between two or more class
  • a dependency only between two

Pregunta 124

Pregunta
174. Which of the following returns true if at least one expression is true?
Respuesta
  • and
  • or

Pregunta 125

Pregunta
175. Which of the following returns true if two expressions are true?
Respuesta
  • and
  • not

Pregunta 126

Pregunta
176. The keywords of the Switch statement are ...
Respuesta
  • switch, case default, goto, return, throw
  • for, case default, goto, return, throw
  • begin,end,swap

Pregunta 127

Pregunta
125. The int type is …
Respuesta
  • value,predefined
  • reference,predefined
  • value,user-defined
  • reference,user-defined

Pregunta 128

Pregunta
126. The bool type is …
Respuesta
  • value,predefined
  • reference,predefined
  • value,user-defined
  • reference,user-defined

Pregunta 129

Pregunta
127. The char type is …
Respuesta
  • value,predefined
  • reference,predefined
  • value,user-defined
  • reference,user-defined

Pregunta 130

Pregunta
128. The long type is …
Respuesta
  • value,predefined
  • reference,predefined
  • value,user-defined
  • reference,user-defined

Pregunta 131

Pregunta
129. The float type is …
Respuesta
  • value,predefined
  • reference,predefined
  • value,user-defined
  • reference,user-defined

Pregunta 132

Pregunta
130. The double type is …
Respuesta
  • value,predefined
  • reference,predefined
  • value,user-defined
  • reference,user-defined

Pregunta 133

Pregunta
131. The class type is …
Respuesta
  • reference, user-defined
  • value,predefined
  • value,user-defined
  • reference,predefined

Pregunta 134

Pregunta
132. The interface type is …
Respuesta
  • reference, user-defined
  • value,user-defined
  • value,predefined
  • reference,predefined

Pregunta 135

Pregunta
133. The object type is…
Respuesta
  • value,predefined
  • value,user-defined
  • reference,user-defined
  • reference,predefined

Pregunta 136

Pregunta
134. The string type is …
Respuesta
  • reference,predefined
  • value,predefined
  • value,user-defined
  • reference,user-defined

Pregunta 137

Pregunta
135. The struct type is …
Respuesta
  • value, user-defined
  • reference,user-defined
  • value,predefined
  • reference,predefined

Pregunta 138

Pregunta
136. The enum type is …
Respuesta
  • value, user-defined
  • reference,user-defined
  • reference,predefined
  • value,predefined
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