Explore topic-wise MCQs in Testing Subject.

This section includes 657 Mcqs, each offering curated multiple-choice questions to sharpen your Testing Subject knowledge and support exam preparation. Choose a topic below to get started.

1.

Which of the following concepts means waiting until runtime to determine which function to call?

A. Data hiding
B. Dynamic casting
C. Dynamic binding
D. Dynamic loading
Answer» D. Dynamic loading
Discussion
2.

How "Late binding" is implemented in C++?

A. Using C++ tables
B. Using Virtual tables
C. Using Indexed virtual tables
D. Using polymorphic tables
Answer» C. Using Indexed virtual tables
Discussion
3.

Which of the following correctly describes overloading of functions?

A. Virtual polymorphism
B. Transient polymorphism
C. Ad-hoc polymorphism
D. Pseudo polymorphism
Answer» D. Pseudo polymorphism
Discussion
4.

Which of the following approach is adapted by C++?

A. Top-down
B. Bottom-up
C. Right-left
D. Left-right
Answer» C. Right-left
Discussion
5.

Which of the following is correct about function overloading?

A. The types of arguments are different.
B. The order of argument is different.
C. The number of argument is same.
D. Both A and B.
Answer» E.
Discussion
6.

Why reference is not same as a pointer?

A. A reference can never be null.
B. A reference once established cannot be changed.
C. Reference doesn't need an explicit dereferencing mechanism.
D. All of the above.
Answer» E.
Discussion
7.

cout is a/an __________ .

A. operator
B. function
C. object
D. macro
Answer» D. macro
Discussion
8.

Which of the following concepts provides facility of using object of one class inside another class?

A. Encapsulation
B. Abstraction
C. Composition
D. Inheritance
Answer» D. Inheritance
Discussion
9.

How many types of polymorphisms are supported by C++?

A. 1
B. 2
C. 3
D. 4
Answer» C. 3
Discussion
10.

Which of the following term is used for a function defined inside a class?

A. Member Variable
B. Member function
C. Class function
D. Classic function
Answer» C. Class function
Discussion
11.

Which of the following cannot be friend?

A. Function
B. Class
C. Object
D. Operator function
Answer» D. Operator function
Discussion
12.

Which of the following concepts of OOPS means exposing only necessary information to client?

A. Encapsulation
B. Abstraction
C. Data hiding
D. Data binding
Answer» D. Data binding
Discussion
13.

Which of the following gets called when an object is being created?

A. constructor
B. virtual function
C. destructor
D. main
Answer» B. virtual function
Discussion
14.

To ensure that every object in the array receives a destructor call, always delete memory allocated as an array with operator __________ .

A. destructor
B. delete
C. delete[]
D. kill[]
E. free[]
Answer» D. kill[]
Discussion
15.

Which of the following statement is correct about constructors?

A. A constructor has a return type.
B. A constructor cannot contain a function call.
C. A constructor has no return type.
D. A constructor has a void return type.
Answer» D. A constructor has a void return type.
Discussion
16.

How many instances of an abstract class can be created?

A. 1
B. 5
C. 13
D. 0
Answer» E.
Discussion
17.

Which of the following concept of oops allows compiler to insert arguments in a function call if it is not specified?

A. Call by value
B. Call by reference
C. Default arguments
D. Call by pointer
Answer» D. Call by pointer
Discussion
18.

Which of the following statement is correct whenever an object goes out of scope?

A. The default constructor of the object is called.
B. The parameterized destructor is called.
C. The default destructor of the object is called.
D. None of the above.
Answer» D. None of the above.
Discussion
19.

If the programmer does not explicitly provide a destructor, then which of the following creates an empty destructor?

A. Preprocessor
B. Compiler
C. Linker
D. <i class="cpp-code">main()</i>
E. function
Answer» C. Linker
Discussion
20.

It is a __________ error to pass arguments to a destructor.

A. logical
B. virtual
C. syntax
D. linker
Answer» D. linker
Discussion
21.

A class's __________ is called when an object is destroyed.

A. constructor
B. destructor
C. assignment function
D. copy constructor
Answer» C. assignment function
Discussion
22.

Destructors __________ for automatic objects if the program terminates with a call to function exit or function abort.

A. are called
B. are inherited
C. are not called
D. are created
Answer» D. are created
Discussion
23.

How many times a constructor is called in the life-time of an object?

A. Only once
B. Twice
C. Thrice
D. Depends on the way of creation of object
Answer» B. Twice
Discussion
24.

Which of the following is an abstract data type?

A. int
B. double
C. string
D. Class
Answer» E.
Discussion
25.

A __________ is a constructor that either has no parameters, or if it has parameters, all the parameters have default values.

A. default constructor
B. copy constructor
C. Both A and B
D. None of these
Answer» B. copy constructor
Discussion
26.

Constructors __________ to allow different approaches of object construction.

A. cannot overloaded
B. can be overloaded
C. can be called
D. can be nested
Answer» C. can be called
Discussion
27.

How many default constructors per class are possible?

A. Only one
B. Two
C. Three
D. Unlimited
Answer» B. Two
Discussion
28.

Which of the following statement is correct about destructors?

A. A destructor has void return type.
B. A destructor has integer return type.
C. A destructor has no return type.
D. A destructors return type is always same as that of main().
Answer» D. A destructors return type is always same as that of main().
Discussion
29.

Which of the following cannot be declared as virtual?

A. Constructor
B. Destructor
C. Data Members
D. Both A and C
Answer» E.
Discussion
30.

If the copy constructor receives its arguments by value, the copy constructor would

A. call one-argument constructor of the class
B. work without any problem
C. call itself recursively
D. call zero-argument constructor
Answer» D. call zero-argument constructor
Discussion
31.

Which of the following are NOT provided by the compiler by default?

A. Zero-argument Constructor
B. Destructor
C. Copy Constructor
D. Copy Destructor
Answer» E.
Discussion
32.

A function with the same name as the class, but preceded with a tilde character (~) is called __________ of that class.

A. constructor
B. destructor
C. function
D. object
Answer» C. function
Discussion
33.

A union that has no constructor can be initialized with another union of __________ type.

A. different
B. same
C. virtual
D. class
Answer» C. virtual
Discussion
34.

Which of the following gets called when an object goes out of scope?

A. constructor
B. destructor
C. main
D. virtual function
Answer» C. main
Discussion
35.

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» D. Both B or C
Discussion
36.

Which of the following function / type of function cannot be overloaded?

A. Member function
B. Static function
C. Virtual function
D. Both B and C
Answer» D. Both B and C
Discussion
37.

Which of the following function declaration is/are incorrect?

A. <i class="cpp-code">int Sum(int a, int b = 2, int c = 3);</i>
B. <i class="cpp-code">int Sum(int a = 5, int b);</i>
C. <i class="cpp-code">int Sum(int a = 0, int b, int c = 3);</i>
D. Both B and C are incorrect.
E. All are correct.
Answer» E. All are correct.
Discussion
38.

Which of the following can be overloaded?

A. Object
B. Functions
C. Operators
D. Both B and C
Answer» E.
Discussion
39.

How many objects can be created from an abstract class?

A. Zero
B. One
C. Two
D. As many as we want
Answer» B. One
Discussion
40.

What does the class definitions in following code represent? class Bike { Engine objEng; }; class Engine { float CC; };

A. kind of relationship
B. has a relationship
C. Inheritance
D. Both A and B
Answer» C. Inheritance
Discussion
41.

Which of the following statements is correct when a class is inherited privately?

A. Public members of the base class become protected members of derived class.
B. Public members of the base class become private members of derived class.
C. Private members of the base class become private members of derived class.
D. Public members of the base class become public members of derived class.
Answer» C. Private members of the base class become private members of derived class.
Discussion
42.

What does a class hierarchy depict?

A. It shows the relationships between the classes in the form of an organization chart.
B. It describes "has a" relationships.
C. It describes "kind of" relationships.
D. It shows the same relationship as a family tree.
Answer» D. It shows the same relationship as a family tree.
Discussion
43.

__________ used to make a copy of one class object from another class object of the same class type.

A. constructor
B. copy constructor
C. destructor
D. default constructor
Answer» C. destructor
Discussion
44.

Which of the following statements are correct for a static member function? It can access only other static members of its class. It can be called using the class name, instead of objects.

A. Only 1 is correct.
B. Only 2 is correct.
C. Both 1 and 2 are correct.
D. Both 1 and 2 are incorrect.
Answer» D. Both 1 and 2 are incorrect.
Discussion
45.

Which of the following means "The use of an object of one class in definition of another class"?

A. Encapsulation
B. Inheritance
C. Composition
D. Abstraction
Answer» D. Abstraction
Discussion
46.

Which of the following is the only technical difference between structures and classes in C++?

A. Member function and data are by default protected in structures but private in classes.
B. Member function and data are by default private in structures but public in classes.
C. Member function and data are by default public in structures but private in classes.
D. Member function and data are by default public in structures but protected in classes.
Answer» D. Member function and data are by default public in structures but protected in classes.
Discussion
47.

Which of the following statements is correct about the program given below? class Bix { public: static void MyFunction(); }; int main() { void(*ptr)() = &amp;Bix::MyFunction; return 0; }

A. The program reports an error as pointer to member function cannot be defined outside the definition of class.
B. The program reports an error as pointer to static member function cannot be defined.
C. The program reports an error as pointer to member function cannot be defined without object.
D. The program reports linker error.
Answer» E.
Discussion
48.

Which of the following function / types of function cannot have default parameters?

A. Member function of class
B. <i class="cpp-code">main()</i>
C. Member function of structure
D. Both B and C
Answer» C. Member function of structure
Discussion
49.

Which of the following implicitly creates a default constructor when the programmer does not explicitly define at least one constructor for a class?

A. Preprocessor
B. Linker
C. Loader
D. Compiler
Answer» E.
Discussion
50.

A destructor takes __________ arguments.

A. one
B. two
C. three
D. no
Answer» E.
Discussion