MCQOPTIONS
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MCQOPTIONS
This section includes 916 Mcqs, each offering curated multiple-choice questions to sharpen your Technical Programming knowledge and support exam preparation. Choose a topic below to get started.
| 101. |
Which type of value is resulted from the delete operator? |
| A. | void |
| B. | void pointer |
| C. | null pointer |
| D. | null |
| Answer» B. void pointer | |
| 102. |
Does delete return any value? |
| A. | Yes, positive value |
| B. | Yes, negative value |
| C. | Yes, zero value |
| D. | No |
| Answer» E. | |
| 103. |
If an object is allocated using new operator ____________ |
| A. | It should be deleted using delete operator |
| B. | It can’t be deleted using delete operator |
| C. | It may or may not be deleted using delete operator |
| D. | The delete operator is not applicable |
| Answer» B. It can’t be deleted using delete operator | |
| 104. |
If an object is allocated using new operator ___________ |
| A. | It should be deleted using delete operator |
| B. | It can’t be deleted using delete operator |
| C. | It may or may not be deleted using delete operator |
| D. | The delete operator is not applicable |
| Answer» B. It can’t be deleted using delete operator | |
| 105. |
What is delete operator? |
| A. | Deallocates a block of memory |
| B. | Deallocates whole program memory |
| C. | Deallocates only primitive data memory |
| D. | Deallocates all the data reserved for a class |
| Answer» B. Deallocates whole program memory | |
| 106. |
How does compiler convert “::operator new” implicitly? |
| A. | ::operator new( sizeof( type ) ) |
| B. | ::operator new( sizeof( ) ) |
| C. | new operator :: type sizeof( type ) |
| D. | new sizeof( type ) operator |
| Answer» B. ::operator new( sizeof( ) ) | |
| 107. |
If new operator is defined for a class and still global new operator have to be used, which operator should be used with the keyword new? |
| A. | Colon |
| B. | Arrow |
| C. | Dot |
| D. | Scope resolution |
| Answer» E. | |
| 108. |
The new operator _________________ |
| A. | Invokes function operator new |
| B. | Doesn’t invoke function operator new |
| C. | Invokes function operator only if required |
| D. | Can’t invoke function operator new implicitly |
| Answer» B. Doesn’t invoke function operator new | |
| 109. |
The objects allocated using new operator ________________ |
| A. | Are destroyed when they go out of scope |
| B. | Are not destroyed even if they go out of scope |
| C. | Are destroyed anytime |
| D. | Are not destroyed throughout the program execution |
| Answer» C. Are destroyed anytime | |
| 110. |
Initializers __________________ |
| A. | Are used for specifying arrays |
| B. | Are used to defined multidimensional arrays |
| C. | Can’t be specified for arrays |
| D. | Can’t be specified for any data |
| Answer» D. Can’t be specified for any data | |
| 111. |
Which among the following is added in grammar of new operator? |
| A. | Finalize |
| B. | Arg |
| C. | Initializer |
| D. | Allocator |
| Answer» D. Allocator | |
| 112. |
The new operator _____________ |
| A. | Can allocate reference types too |
| B. | Doesn’t allocate reference types |
| C. | Can allocate reference to objects |
| D. | Doesn’t allocate any data |
| Answer» C. Can allocate reference to objects | |
| 113. |
For declaring data by using new operator ____________________ |
| A. | Type name can’t contain const |
| B. | Type name can’t contain volatile |
| C. | Type name can’t contain class declarations |
| D. | Type name can’t contain const, volatile, class declaration or enumerations |
| Answer» E. | |
| 114. |
Which among the following is correct syntax to declare a 2D array using new operator? |
| A. | char (*pchar)[10] = new char[][10]; |
| B. | char (pchar) = new char[][10]; |
| C. | char (*char) = new char[10][]; |
| D. | char (*char)[][10]= new char; |
| Answer» B. char (pchar) = new char[][10]; | |
| 115. |
In C++, if new operator is used, when is the constructor called? |
| A. | Before the allocation of memory |
| B. | After the allocation of memory |
| C. | Constructor is called to allocate memory |
| D. | Depends on code |
| Answer» C. Constructor is called to allocate memory | |
| 116. |
If new throws an error, which function can be called to write a custom exception handler? |
| A. | _set_handler |
| B. | _new_handler |
| C. | _handler_setter |
| D. | _set_new_handler |
| Answer» E. | |
| 117. |
What happens when new fails? |
| A. | Returns zero always |
| B. | Throws an exception always |
| C. | Either throws an exception or returns zero |
| D. | Terminates the program |
| Answer» D. Terminates the program | |
| 118. |
Microsoft C++ Components extensions support new keyword to _____________ |
| A. | Modify a vtable |
| B. | Replace a vtable slot entry |
| C. | Add new vtable slot entries |
| D. | Rearrange vtable slot entries |
| Answer» D. Rearrange vtable slot entries | |
| 119. |
What is new operator? |
| A. | Allocates memory for an object or array |
| B. | Allocates memory for an object or array and returns a particular pointer |
| C. | Used as return type when an object is created |
| D. | Used to declare any new thing in a program |
| Answer» C. Used as return type when an object is created | |
| 120. |
Why is downcasting possible in any language? |
| A. | Because inheritance follows has-a relationship |
| B. | Because inheritance follows is-a relationship |
| C. | Because inheritance doesn’t follow any relationship |
| D. | Because inheritance is not involved in casting |
| Answer» C. Because inheritance doesn’t follow any relationship | |
| 121. |
When is downcating used? |
| A. | To separate inherited class from base class |
| B. | To write a more complex code |
| C. | To compare two objects |
| D. | To disable one class in inheritance |
| Answer» D. To disable one class in inheritance | |
| 122. |
What happens when downcasting is done but not explicitly defined in syntax? |
| A. | Compile time error |
| B. | Runtime error |
| C. | Code write time error |
| D. | Conversion error |
| Answer» B. Runtime error | |
| 123. |
Which way the downcasting is possible with respect to inheritance? |
| A. | Upward the inheritance order |
| B. | Downward the inheritance order |
| C. | Either upward or downward the inheritance order |
| D. | Order of inheritance doesn’t matter |
| Answer» C. Either upward or downward the inheritance order | |
| 124. |
Java supports direct downcasting. |
| A. | True |
| B. | False |
| Answer» C. | |
| 125. |
How to prevent the ClassCastExceptions? |
| A. | By using instanceof |
| B. | By using is-a check |
| C. | By using arrow operator with check function |
| D. | By checking type of conversion |
| Answer» B. By using is-a check | |
| 126. |
Which is the exception handler for the exceptions of downcasting? |
| A. | CastException |
| B. | ClassCastingExeption |
| C. | ClassCasting |
| D. | ClassCastException |
| Answer» E. | |
| 127. |
Which is the proper syntax of dynamic_cast? |
| A. | dynamic_cast(object) |
| B. | dynamic_cast new (object) |
| C. | dynamic_cast(object) |
| D. | dynamic_cast(object) |
| Answer» D. dynamic_cast(object) | |
| 128. |
If dynamic_cast fails, which value is returned? |
| A. | void |
| B. | null |
| C. | void pointer |
| D. | null pointer |
| Answer» E. | |
| 129. |
What does dynamic_cast return after successful type casting? |
| A. | Address of object which is converted |
| B. | Address of object that is used for conversion |
| C. | Address of object that is mentioned in the syntax |
| D. | Doesn’t return any address |
| Answer» B. Address of object that is used for conversion | |
| 130. |
What should be used for safe downcast? |
| A. | Static cast |
| B. | Dynamic cast |
| C. | Manual cast |
| D. | Implicit cast |
| Answer» C. Manual cast | |
| 131. |
Downcasting ____________________ |
| A. | Can result in unexpected results |
| B. | Can’t result in unexpected result |
| C. | Can result only in out of memory error |
| D. | Can’t result in any error |
| Answer» B. Can’t result in unexpected result | |
| 132. |
Downcasting is _______________________ |
| A. | Always safe |
| B. | Never safe |
| C. | Safe sometimes |
| D. | Safe, depending on code |
| Answer» C. Safe sometimes | |
| 133. |
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» D. It can’t be done explicitly | |
| 134. |
What is downcasting? |
| A. | Casting subtype to supertype |
| B. | Casting supertype to subtype |
| C. | Casting subtype to supertype and vice versa |
| D. | Casting anytype to any other type |
| Answer» C. Casting subtype to supertype and vice versa | |
| 135. |
If two classes are defined “Parent” and “Child” then which is the correct type upcast syntax in C++? |
| A. | Parent *p=child; |
| B. | Parent *p=*child; |
| C. | Parent *p=&child; |
| D. | Parent *p=Child(); |
| Answer» D. Parent *p=Child(); | |
| 136. |
When are the object type known for upcasting the objects? |
| A. | Compile time |
| B. | Runtime |
| C. | Source code build time |
| D. | Doesn’t apply to objects directly |
| Answer» C. Source code build time | |
| 137. |
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» B. Runtime | |
| 138. |
Which concept is needed because of implicit type casting use? |
| A. | Static binding |
| B. | Dynamic binding |
| C. | Compile time binding |
| D. | Source code binding |
| Answer» C. Compile time binding | |
| 139. |
Upcasting is _____________________ without an explicit type cast. |
| A. | Always allowed for public inheritance |
| B. | Always allowed for protected inheritance |
| C. | Always allowed for private inheritance |
| D. | Not allowed |
| Answer» B. Always allowed for protected inheritance | |
| 140. |
If class C inherits class B and class B inherits class A ________________ |
| A. | Class C object can be upcasted to object of class B only |
| B. | Class C object can be upcasted to object of class A only |
| C. | Class C object can be upcasted to object of either class A or B |
| D. | Class C object can’t be upcasted |
| Answer» D. Class C object can’t be upcasted | |
| 141. |
If multiple inheritance is implemented, which upcasting will be correct? |
| A. | Upcast to first base class listed in inheritance |
| B. | Upcast to send base class listed in inheritance |
| C. | Upcast to any base class |
| D. | Upcast is not possible |
| Answer» D. Upcast is not possible | |
| 142. |
Upcasting and downcasting objects is same as casting primitive types. |
| A. | True |
| B. | False |
| Answer» C. | |
| 143. |
Which property is shown most when upcasting is used? |
| A. | Code reusability |
| B. | Code efficiency |
| C. | Complex code simple syntax |
| D. | Encapsulation |
| Answer» D. Encapsulation | |
| 144. |
Which among the following is best situation to use upcasting? |
| A. | For general code dealing with only subtype |
| B. | For general code dealing with only supertype |
| C. | For general code dealing with both the supertype and subtype |
| D. | For writing a rigid code with respect to subtype |
| Answer» C. For general code dealing with both the supertype and subtype | |
| 145. |
Which among the following is safe? |
| A. | Upcasting |
| B. | Downcasting |
| C. | Both upcasting and downcasting |
| D. | If upcasting is safe then downcasting is not, and vice versa |
| Answer» B. Downcasting | |
| 146. |
Which among the following is true for upcasting in inheritance? |
| A. | Downward to the inheritance tree |
| B. | Upward to the inheritance tree |
| C. | Either upward or downward |
| D. | Doesn’t apply on inheritance |
| Answer» C. Either upward or downward | |
| 147. |
What is upcasting? |
| A. | Casting subtype to supertype |
| B. | Casting super type to subtype |
| C. | Casting subtype to super type and vice versa |
| D. | Casting anytype to any other type |
| Answer» B. Casting super type to subtype | |
| 148. |
Which is a good alternative instead of having one zero argument constructor and one single argument constructor with default argument? |
| A. | No constructor defined |
| B. | One default value constructor |
| C. | Defining the default constructor |
| D. | Using one constructor with two arguments |
| Answer» C. Defining the default constructor | |
| 149. |
Which is the correct statement for default constructors? |
| A. | The constructors with all the default arguments |
| B. | The constructors with all the null and zero values |
| C. | The constructors which can’t be defined by programmer |
| D. | The constructors with zero arguments |
| Answer» E. | |
| 150. |
If there is a constructor with all the default arguments and arguments are not passed then _________________ |
| A. | The default values given will not be used |
| B. | Then all the null values will be used |
| C. | Then all the default values given will be used |
| D. | Then compiler will produce an error |
| Answer» D. Then compiler will produce an error | |