Explore topic-wise MCQs in Technical Programming.

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
Discussion
102.

Does delete return any value?

A. Yes, positive value
B. Yes, negative value
C. Yes, zero value
D. No
Answer» E.
Discussion
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
Discussion
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
Discussion
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
Discussion
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( ) )
Discussion
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.
Discussion
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
Discussion
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
Discussion
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
Discussion
111.

Which among the following is added in grammar of new operator?

A. Finalize
B. Arg
C. Initializer
D. Allocator
Answer» D. Allocator
Discussion
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
Discussion
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.
Discussion
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];
Discussion
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
Discussion
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.
Discussion
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
Discussion
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
Discussion
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
Discussion
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
Discussion
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
Discussion
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
Discussion
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
Discussion
124.

Java supports direct downcasting.

A. True
B. False
Answer» C.
Discussion
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
Discussion
126.

Which is the exception handler for the exceptions of downcasting?

A. CastException
B. ClassCastingExeption
C. ClassCasting
D. ClassCastException
Answer» E.
Discussion
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)
Discussion
128.

If dynamic_cast fails, which value is returned?

A. void
B. null
C. void pointer
D. null pointer
Answer» E.
Discussion
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
Discussion
130.

What should be used for safe downcast?

A. Static cast
B. Dynamic cast
C. Manual cast
D. Implicit cast
Answer» C. Manual cast
Discussion
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
Discussion
132.

Downcasting is _______________________

A. Always safe
B. Never safe
C. Safe sometimes
D. Safe, depending on code
Answer» C. Safe sometimes
Discussion
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
Discussion
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
Discussion
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();
Discussion
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
Discussion
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
Discussion
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
Discussion
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
Discussion
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
Discussion
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
Discussion
142.

Upcasting and downcasting objects is same as casting primitive types.

A. True
B. False
Answer» C.
Discussion
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
Discussion
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
Discussion
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
Discussion
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
Discussion
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
Discussion
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
Discussion
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.
Discussion
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
Discussion