McqMate
1. |
Which of the followings is/are automatically added to every class, if we do not write our own? |
A. | Copy Constructor |
B. | Assignment Operator |
C. | A constructor without any parameter |
D. | All of the above |
Answer» D. All of the above |
2. |
When a copy constructor may be called? |
A. | When an object of the class is returned by value. |
B. | When an object of the class is passed (to a function) by value as an argument. |
C. | When an object is constructed based on another object of the same class |
D. | All of the above |
Answer» D. All of the above |
3. |
Constructors have _____ return type. |
A. | void |
B. | char |
C. | int |
D. | no |
Answer» D. no |
4. |
Implicit return type of a class constructor is: |
A. | not of class type itself |
B. | class type itself |
C. | a destructor of class type |
D. | a destructor not of class type |
Answer» B. class type itself |
5. |
Which of the following is true about constructors?
|
A. | All 1, 2, and 3 |
B. | Only 1 and 3 |
C. | Only 1 and 2 |
D. | Only 2 and 3 |
Answer» B. Only 1 and 3 |
6. |
Output of following program?
|
A. | Compiler Error |
B. | Runtime Error |
C. | Constructor called |
D. | None of the above |
Answer» A. Compiler Error |
7. |
#include<iostream>
|
A. | Compiler Error |
B. | Constructor called Constructor called |
C. | Constructor called |
D. | None of the above |
Answer» C. Constructor called |
8. |
Which operator is having the highest precedence? |
A. | postfix |
B. | unary |
C. | shift |
D. | equality |
Answer» D. equality |
9. |
Which of the following is FALSE about references in C++? |
A. | References cannot be NULL |
B. | A reference must be initialized when declared |
C. | Once a reference is created, it cannot be later made to reference another object; it cannot be reset. |
D. | References cannot refer to constant value |
Answer» D. References cannot refer to constant value |
10. |
Which of the following functions must use reference? |
A. | Assignment operator function |
B. | Copy Constructor |
C. | Destructor |
D. | Parameterized constructor |
Answer» B. Copy Constructor |
11. |
Output of following C++ program?
|
A. | x = 20; ref = 30 |
B. | x = 20; ref = 20 |
C. | x = 10; ref = 30 |
D. | x = 30; ref = 30 |
Answer» A. x = 20; ref = 30 |
12. |
What is the difference between struct and class in C++? |
A. | All members of a structure are public and structures don’t have constructors and destructors |
B. | Members of a class are private by default and members of struct are public by default. When deriving a struct from a class/struct, default access-specifier for a base class/struct is public and when deriving a class, default access specifier is private. |
C. | All members of a structure are public and structures don’t have virtual functions |
D. | All of the above |
Answer» B. Members of a class are private by default and members of struct are public by default. When deriving a struct from a class/struct, default access-specifier for a base class/struct is public and when deriving a class, default access specifier is private. |
13. |
Predict the output of following C++ program.
|
A. | A non-zero value |
B. | 0 |
C. | Compiler Error |
D. | Runtime Error |
Answer» A. A non-zero value |
14. |
class Test {
|
A. | 0 |
B. | Garbage Value |
C. | Compiler Error |
D. | None |
Answer» C. Compiler Error |
15. |
Which of the following is true? |
A. | All objects of a class share all data members of class |
B. | Objects of a class do not share non-static members. Every object has its own copy. |
C. | Objects of a class do not share codes of non-static methods, they have their own copy |
D. | None of the above |
Answer» B. Objects of a class do not share non-static members. Every object has its own copy. |
16. |
A member function can always access the data in __________, (in C++). |
A. | the class of which it is member |
B. | the object of which it is a member |
C. | the public part of its class |
D. | the private part of its class |
Answer» A. the class of which it is member |
17. |
Which of the following is not correct for virtual function in C++? |
A. | Must be declared in public section of class. |
B. | Virtual function can be static. |
C. | Virtual function should be accessed using pointers. |
D. | Virtual function is defined in base class. |
Answer» B. Virtual function can be static. |
18. |
Which of the following is not correct (in C++)?
|
A. | (1) |
B. | (2), (4) |
C. | (2), (3), (4) |
D. | (4) |
Answer» C. (2), (3), (4) |
19. |
Which of the following cannot be passed to a function in C++? |
A. | Constant |
B. | Structure |
C. | Array |
D. | Header file |
Answer» D. Header file |
20. |
Which of the following, in C++, is inherited in a derived class from base class? |
A. | Constructor |
B. | Destructor |
C. | Data members |
D. | Virtual methods |
Answer» C. Data members |
21. |
Which of the following is a correct statement? |
A. | Composition is a strong type of association between two classes with full ownership. |
B. | Composition is a strong type of association between two classes with partial ownership. |
C. | Composition is a weak type of association between two classes with partial ownership. |
D. | Composition is a weak type of association between two classes with strong ownership. |
Answer» A. Composition is a strong type of association between two classes with full ownership. |
22. |
Which of the following is not a correct statement? |
A. | Every class containing abstract method must be declared abstract. |
B. | Abstract class can directly be initiated with ‘new’ operator. |
C. | Abstract class can be initiated. |
D. | Abstract class does not contain any definition of implementation. |
Answer» B. Abstract class can directly be initiated with ‘new’ operator. |
23. |
When a method in a subclass has the same name and type signatures as a method in the superclass, then the method in the subclass _____ the method in the superclass. |
A. | Overloads |
B. | Friendships |
C. | Inherits |
D. | Overrides |
Answer» D. Overrides |
24. |
It is possible to define a class within a class termed as nested class. There are _____ types of nested classes. |
A. | 2 |
B. | 3 |
C. | 4 |
D. | 5 |
Answer» A. 2 |
25. |
When one object reference variable is assigned to another object reference variable then |
A. | a copy of the object is created. |
B. | a copy of the reference is created. |
C. | a copy of the reference is not created. |
D. | it is illegal to assign one object reference variable to another object reference variable. |
Answer» B. a copy of the reference is created. |
26. |
Which of the following is not a member of class? |
A. | Static function |
B. | Friend function |
C. | Const function |
D. | Virtual function |
Answer» B. Friend function |
27. |
How can we restrict dynamic allocation of objects of a class using new? |
A. | By overloading new operator |
B. | By making an empty private new operator. |
C. | By making an empty private new and new[] operators |
D. | By overloading new operator and new[] operators |
Answer» C. By making an empty private new and new[] operators |
28. |
Which of the following operators cannot be overloaded? |
A. | . (Member Access or Dot operator) |
B. | ?: (Ternary or Conditional Operator) |
C. | :: (Scope Resolution Operator) |
D. | All of the above |
Answer» D. All of the above |
29. |
Which of the following operators are overloaded by default by the compiler in every user defined classes even if user has not written? 1) Comparison Operator (==) 2) Assignment Operator (=) |
A. | Both 1 and 2 |
B. | Only 1 |
C. | Only 2 |
D. | None of the two |
Answer» C. Only 2 |
30. |
Which of the following operators should be preferred to overload as a global function rather than a member method? |
A. | Postfix ++ |
B. | Comparison Operator |
C. | Insertion Operator << |
D. | Prefix++ |
Answer» C. Insertion Operator << |
31. |
How C++ compiler does differ between overloaded postfix and prefix operators? |
A. | C++ doesn’t allow both operators to be overloaded in a class |
B. | A postfix ++ has a dummy parameter |
C. | A prefix ++ has a dummy parameter |
D. | By making prefix ++ as a global function and postfix as a member function. |
Answer» B. A postfix ++ has a dummy parameter |
32. |
Which of the following operator functions cannot be global? |
A. | new |
B. | delete |
C. | Conversion Operator |
D. | All of the above |
Answer» C. Conversion Operator |
33. |
Which of the following is true about this pointer? |
A. | It is passed as a hidden argument to all function calls |
B. | It is passed as a hidden argument to all non-static function calls |
C. | It is passed as a hidden argument to all static functions |
D. | None of the above |
Answer» B. It is passed as a hidden argument to all non-static function calls |
34. |
What is the use of this pointer? |
A. | When local variable’s name is same as member’s name, we can access member using this pointer. |
B. | To return reference to the calling object |
C. | Can be used for chained function calls on an object |
D. | All of the above |
Answer» D. All of the above |
35. |
Which of the following in Object Oriented Programming is supported by Function overloading and default arguments features of C++? |
A. | Inheritance |
B. | Polymorphism |
C. | Encapsulation |
D. | None of the above |
Answer» B. Polymorphism |
36. |
Output of the program?
|
A. | 10 |
B. | 0 |
C. | 20 |
D. | Compiler Error |
Answer» D. Compiler Error |
37. |
Output of following program?
|
A. | Compiler Error |
B. | 5 |
C. | 0 |
D. | 10 |
Answer» B. 5 |
38. |
Which of the following is true? |
A. | Static methods cannot be overloaded. |
B. | Static data members can only be accessed by static methods. |
C. | Non-static data members can be accessed by static methods. |
D. | Static methods can only access static members (data and methods) |
Answer» D. Static methods can only access static members (data and methods) |
39. |
If a function is friend of a class, which one of the following is wrong? |
A. | A function can only be declared a friend by a class itself. |
B. | Friend functions are not members of a class, they are associated with it. |
C. | Friend functions are members of a class. |
D. | It can have access to all members of the class, even private ones. |
Answer» C. Friend functions are members of a class. |
40. |
Which one of the following is correct, when a class grants friend status to another class? |
A. | The member functions of the class generating friendship can access the members of the friend class. |
B. | All member functions of the class granted friendship have unrestricted access to the members of the class granting the friendship. |
C. | Class friendship is reciprocal to each other. |
D. | There is no such concept. |
Answer» B. All member functions of the class granted friendship have unrestricted access to the members of the class granting the friendship. |
41. |
In C++, const qualifier can be applied to
|
A. | Only 1, 2 and 3 |
B. | Only 1, 2 and 4 |
C. | All |
D. | Only 1, 3 and 4 |
Answer» C. All |
42. |
How to create a dynamic array of pointers (to integers) of size 10 using new in C++? Hint: We can create a non-dynamic array using int *arr[10] |
A. | int *arr = new int *[10]; |
B. | int **arr = new int *[10]; |
C. | int *arr = new int [10]; |
D. | Not Possible |
Answer» B. int **arr = new int *[10]; |
43. |
Which of the following is true about new when compared with malloc:
|
A. | 1 and 3 |
B. | 2 and 3 |
C. | 1 and 2 |
D. | All 1, 2 and 3 |
Answer» D. All 1, 2 and 3 |
44. |
Predict the output?
|
A. | Compiler Error |
B. | 5 |
C. | Garbage Value |
D. | 0 |
Answer» A. Compiler Error |
45. |
Is it fine to call delete twice for a pointer?
|
A. | Yes |
B. | No |
C. | none |
D. | all |
Answer» B. No |
46. |
When the inheritance is private, the private methods in base class are __________ in the derived class (in C++). |
A. | inaccessible |
B. | accessible |
C. | protected |
D. | public |
Answer» A. inaccessible |
47. |
What happens when delete is used for a NULL pointer?
|
A. | Compiler Error |
B. | Run-time Crash |
C. | No Error |
D. | None |
Answer» C. No Error |
48. |
Which of the following is true about virtual functions in C++? |
A. | Virtual functions are functions that can be overridden in derived class with the same signature. |
B. | Virtual functions enable run-time polymorphism in a inheritance hierarchy. |
C. | If a function is ‘virtual’ in the base class, the most-derived class implementation of the function is called according to the actual type of the object referred to, regardless of the declared type of the pointer or reference. In non-virtual functions, the functions are called according to the type of reference or pointer. |
D. | All of the above |
Answer» D. All of the above |
49. |
Which of the following is true about pure virtual functions?
|
A. | Both 1 and 2 |
B. | Only 1 |
C. | Only 2 |
D. | Neither 1 nor 2 |
Answer» C. Only 2 |
50. |
What is the size of wchar_t in C++? |
A. | 2 |
B. | 4 |
C. | 2 or 4 |
D. | Based on the number of bits in the system |
Answer» D. Based on the number of bits in the system |
51. |
Which of the following is true about templates?
|
A. | 1 and 2 |
B. | 1, 2 and 3 |
C. | 1, 2 and 4 |
D. | 1, 2, 3 and 4 |
Answer» D. 1, 2, 3 and 4 |
52. |
Which of the following is incorrect in C++?
|
A. | (1) and (2) |
B. | (1), (2) and (3) |
C. | (3) and (4) |
D. | All are correct. |
Answer» D. All are correct. |
53. |
Pick the odd one out |
A. | array type |
B. | character type |
C. | Boolean type |
D. | integer type |
Answer» A. array type |
54. |
Which data type is used to represent the absence of parameters? |
A. | int |
B. | short |
C. | void |
D. | float |
Answer» C. void |
55. |
What does an escape code represent? |
A. | alert |
B. | backslash |
C. | tab |
D. | form feed |
Answer» A. alert |
56. |
Which type is best suited to represent the logical values? |
A. | integer |
B. | Boolean |
C. | character |
D. | all of the mentioned |
Answer» B. Boolean |
57. |
Identify the user-defined types from the following? |
A. | enumeration |
B. | classes |
C. | both enumeration and classes |
D. | int |
Answer» C. both enumeration and classes |
58. |
Which of the following statements are true? int f (float) |
A. | f is a function taking an argument of type int and returning a floating point number |
B. | f is a function taking an argument of type float and returning an integer |
C. | f is a function of type float |
D. | none of the mentioned |
Answer» B. f is a function taking an argument of type float and returning an integer |
59. |
The value 132.54 can be represented using which data type? |
A. | double |
B. | void |
C. | int |
D. | bool |
Answer» A. double |
60. |
When a language has the capability to produce new data type mean, it can be called as …... |
A. | overloaded |
B. | extensible |
C. | encapsulated |
D. | reprehensible |
Answer» B. extensible |
61. |
Choose the operator which cannot be overloaded. |
A. | / |
B. | ( ) |
C. | :: |
D. | % |
Answer» C. :: |
62. |
Which operator is required to be overloaded as member function only? |
A. | _ |
B. | _ _ |
C. | ++ (postfix version) |
D. | = |
Answer» D. = |
63. |
Class function which is called automatically as soon as the object is created is called as __ |
A. | Constructor |
B. | Destructor |
C. | Friend function |
D. | Inline function. |
Answer» A. Constructor |
64. |
Which type of data file is analogous to an audio cassette tape? |
A. | Random access file |
B. | Sequential access file |
C. | Binary file |
D. | Source code file |
Answer» B. Sequential access file |
65. |
What is the built in library function to compare two strings? |
A. | string_cmp() |
B. | strcmp() |
C. | equals() |
D. | str_compare() |
Answer» B. strcmp() |
66. |
Which of the following are member dereferencing operators in CPP? 1. * 2. :: 3. ->* 4. ::* 5. -> |
A. | Only 1, 3, 4 |
B. | Only 1 and 5 |
C. | Only 3 and 4 |
D. | Only 3,4,5 |
Answer» A. Only 1, 3, 4 |
67. |
Which of the followings is/are pointer-to-member declarator? |
A. | ->* |
B. | .* |
C. | ::* |
D. | both A and B |
Answer» C. ::* |
68. |
Assigning one or more function body to the same name is called ____________. |
A. | Function Overriding |
B. | Function Overloading |
C. | Both A and B |
D. | None of the above |
Answer» B. Function Overloading |
69. |
Default values for a function are specified when ____. |
A. | Function is defined |
B. | Function is declared |
C. | Both a and b |
D. | None of these |
Answer» B. Function is declared |
70. |
Which of the following best defines the syntax for template function? |
A. | Template |
B. | Template return_type Function_Name(Parameters) |
C. | Both a and b |
D. | None of these |
Answer» C. Both a and b |
71. |
Return type of uncaught_exception () is ________________. |
A. | int |
B. | bool |
C. | char * |
D. | double |
Answer» B. bool |
72. |
If inner catch handler is not able to handle the exception then__________. |
A. | Compiler will look for outer try handler |
B. | Program terminates abnormally |
C. | Compiler will check for appropriate catch handler of outer try block |
D. | None |
Answer» C. Compiler will check for appropriate catch handler of outer try block |
73. |
Attempting to throw an exception that is not supported by a function call results in calling _____________ library function. |
A. | indeterminate () |
B. | unutilized() |
C. | unexpected() |
D. | unpredicted() |
Answer» C. unexpected() |
74. |
The code of statements which may cause abnormal termination of the program should be written under_________ block. |
A. | Try |
B. | catch |
C. | Finally |
D. | None of these |
Answer» A. Try |
75. |
When a virtual function is redefined by the derived class, it is called___________. |
A. | Overloading |
B. | Overriding |
C. | Rewriting |
D. | All of these |
Answer» B. Overriding |
76. |
While overloading binary operators using member function, it requires ___ argument/s. |
A. | Zero |
B. | One |
C. | Two |
D. | Three |
Answer» B. One |
77. |
Where the default value of parameter have to be specified? |
A. | Function call |
B. | Function definition |
C. | Function prototype |
D. | Both B or C |
Answer» C. Function prototype |
78. |
For automatic objects, constructors and destructors are called each time the objects |
A. | enter and leave scope |
B. | inherit parent class |
C. | are constructed |
D. | are destroyed |
Answer» A. enter and leave scope |
79. |
Which operation is used as Logical 'AND' |
A. | Operator-& |
B. | Operator- |
C. | Operator-&& |
D. | Operator + |
Answer» C. Operator-&& |
80. |
When an ADT is implemented as a C++ class, which of the following should normally be true? |
A. | Member functions are private, member variables are public |
B. | Member functions are public, member variables are private |
C. | Member functions as well as member variables are private |
D. | Member functions as well as member variables are public |
Answer» B. Member functions are public, member variables are private |
81. |
Variable that are listed in function's calls are called |
A. | Actual parameter |
B. | Declared parameter |
C. | Passed parameter |
D. | None |
Answer» B. Declared parameter |
82. |
What kind of error can arise when there is a problem with memory? |
A. | Segmentation fault |
B. | Produce an error |
C. | Both Segmentation fault & Produce an error |
D. | None of the mentioned |
Answer» A. Segmentation fault |
83. |
Which operations don’t throw anything? |
A. | Operations which are reversible |
B. | Operations which are irreversible |
C. | Operations which are static |
D. | Operations which are dynamic |
Answer» B. Operations which are irreversible |
84. |
What operation can be performed by destructor? |
A. | Abort the program |
B. | Resource cleanup |
C. | Exit from the current block |
D. | None of the mentioned |
Answer» B. Resource cleanup |
85. |
Which interface in the container is required for storage management? |
A. | Memory management |
B. | Allocator interface |
C. | Memory interface |
D. | None of the mentioned |
Answer» B. Allocator interface |
86. |
How can the member functions in the container be accessed? |
A. | Iterator |
B. | Indirect |
C. | Both Iterator & Indirect |
D. | None of the mentioned |
Answer» A. Iterator |
87. |
In which type of storage location are the vector members stored? |
A. | Contiguous storage locations |
B. | Non-contiguous storage locations |
C. | Contiguous & Non-contiguous storage locations |
D. | None of the mentioned |
Answer» A. Contiguous storage locations |
88. |
What do container adapter provide to interface? |
A. | Restricted interface |
B. | More interface |
C. | No interface |
D. | None |
Answer» A. Restricted interface |
89. |
What does the sequence adaptor provide? |
A. | Insertion |
B. | Deletion |
C. | Interface to sequence container |
D. | None |
Answer» C. Interface to sequence container |
90. |
Which operators is part of RTTI? |
A. | dynamic_cast() |
B. | typeid |
C. | Both dynamic_cast() & typeid |
D. | None |
Answer» C. Both dynamic_cast() & typeid |
91. |
At which time does the static_cast can be applied? |
A. | Compile-time construct |
B. | Runtime construct |
C. | Both Compile-time & Runtime construct |
D. | None |
Answer» A. Compile-time construct |
92. |
Which function is used to position back from the end of file object? |
A. | seekg |
B. | seekp |
C. | both seekg & seekp |
D. | None |
Answer» A. seekg |
93. |
String class have a concat() function that is used to _____________________ |
A. | Replace old string by new string |
B. | Add two strings |
C. | Append one string at end of another string |
D. | Remove a string from end of one string |
Answer» C. Append one string at end of another string |
94. |
Which among the following is/are type(s) of this pointer? |
A. | const |
B. | volatile |
C. | const or volatile |
D. | int |
Answer» C. const or volatile |
95. |
Which is the pointer which denotes the object calling the member function? |
A. | Variable pointer |
B. | This pointer |
C. | Null pointer |
D. | Zero pointer |
Answer» B. This pointer |
96. |
Which property is shown most when upcasting is used? |
A. | Code reusability |
B. | Code efficiency |
C. | Complex code simple syntax |
D. | Encapsulation |
Answer» C. Complex code simple syntax |
97. |
If multiple inheritance is implemented, which upcasting will be correct? |
A. | Upcast to first base class listed in inheritance |
B. | Upcast to any base class |
C. | Upcast to send base class listed in inheritance |
D. | Upcast is not possible |
Answer» B. Upcast to any base class |
98. |
When are the pointer types known for upcasting the objects? |
A. | Compile time |
B. | Runtime |
C. | Source code build time |
D. | Doesn’t apply to pointer types |
Answer» A. Compile time |
99. |
Which among the following is a mandatory condition for downcasting? |
A. | It must not be done explicitly |
B. | It must be done implicitly |
C. | It must be done explicitly |
D. | It can’t be done explicitly |
Answer» C. It must be done explicitly |
100. |
Which container provides random access iterators? |
A. | vector |
B. | deque |
C. | sort |
D. | both vector & deque |
Answer» D. both vector & deque |
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