OOPS Concepts

Q1: Which of the following type of class allows only one object of it to be created?

A Virtual class

B Abstract class

C Singleton class

D Friend class

Q2: Which of the following is not a type of constructor?

A Copy constructor

B Friend constructor

C Default constructor

D Parameterized constructor

Q3: Which one of the following options is correct about the statement given below? The compiler checks the type of reference in the object and not the type of object.

A Inheritance

B Polymorphism

C Abstraction

D Encapsulation

Q4: Which of the following approach is adapted by C++?

A Top-down

B Bottom-up

C Right-left

D Left-right

Q5: Which of the following is the correct way of declaring a function as constant?

A const int ShowData(void) { /* statements */ }

B int const ShowData(void) { /* statements */ }

C int ShowData(void) const { /* statements */ }

D Both A and B

Q6: Which of the following cannot be used with the keyword virtual?

A class

B member functions

C constructor

D destructor

Q7: How many types of polymorphisms are supported by C++?

A 1

B 2

C 3

D 4

Q8: Which of the following concepts means determining at runtime what method to invoke?

A Data hiding

B Dynamic Typing

C Dynamic binding

D Dynamic loading

Q9: Which of the following factors supports the statement that reusability is a desirable feature of a language?

A It decreases the testing time.

B It lowers the maintenance cost.

C It reduces the compilation time.

D Both A and B.

Q10: Which of the following operator is overloaded for object cout?

A >>

B <<

C +

D =

Q11: In which of the following a virtual call is resolved at the time of compilation?

A From inside the destructor.

B From inside the constructor.

C From inside the main().

D Both A and B.

Q12: What will happen if a class is not having any name?

A It cannot have a destructor.

B It cannot have a constructor.

C It is not allowed.

D Both A and B.

Q13: What is correct about the static data member of a class?

A A static member function can access only static data members of a class.

B A static data member is shared among all the object of the class.

C A static data member can be accessed directly from main().

D Both A and B.

Q14: Which one of the following options is correct?

A Friend function can access public data members of the class.

B Friend function can access protected data members of the class.

C Friend function can access private data members of the class.

D All of the above.

Q15: Which of the following cannot be friend?

A Function

B Class

C Object

D Operator function

Q16: Which of the following is the correct class of the object cout?

A iostream

B istream

C ostream

D ifstream

Q17: How "Late binding" is implemented in C++?

A Using C++ tables

B Using Virtual tables

C Using Indexed virtual tables

D Using polymorphic tables

Q18: Which of the following provides a reuse mechanism?

A Abstraction

B Inheritance

C Dynamic binding

D Encapsulation

Q19: 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.

Q20: Which of the following problem causes an exception?

A Missing semicolon in statement in main().

B A problem in calling function.

C A syntax error.

D A run-time error.

Q21: Which of the following statement is correct?

A Class is an instance of object.

B Object is an instance of a class.

C Class is an instance of data type.

D Object is an instance of data type.

Q22: Which of the following correctly describes overloading of functions?

A Virtual polymorphism

B Transient polymorphism

C Ad-hoc polymorphism

D Pseudo polymorphism

Q23: 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

Q24: Which of the following statement is correct?

A C++ allows static type checking.

B C++ allows dynamic type checking.

C C++ allows static member function be of type const.

D Both A and B.

Q25:
Which of the following is correct about the statements given below?
  1. All operators can be overloaded in C++.
  2. We can change the basic meaning of an operator in C++.

A Only I is true.

B Both I and II are false.

C Only II is true.

D Both I and II are true.

Q26: Which of the following is not the member of class?

A Static function

B Friend function

C Const function

D Virtual function

Q27: Which of the following is a mechanism of static polymorphism?

A Operator overloading

B Function overloading

C Function overloading

D All of the above

Q28: Which of the following are available only in the class hierarchy chain?

A Public data members

B Private data members

C Protected data members

D Member functions

Q29: Which of the following header file includes definition of cin and cout?

A istream.h

B ostream.h

C iomanip.h

D iostream.h

Q30: Which of the following is used to make an abstract class?

A Declaring it abstract using static keyword.

B Declaring it abstract using virtual keyword.

C Making at least one member function as virtual function.

D Making at least one member function as pure virtual function.

Q31:
cout is a/an __________ .

A operator

B function

C object

D macro

Q32: Which of the following concepts means adding new components to a program as it runs?

A Data hiding

B Dynamic typing

C Dynamic binding

D Dynamic loading

Q33: Which of the following statements regarding inline functions is correct?

A It speeds up execution.

B It slows down execution.

C It increases the code size.

D Both A and C.

Q34: Which of the following statement is correct?

A A constructor is called at the time of declaration of an object.

B A constructor is called at the time of use of an object.

C A constructor is called at the time of declaration of a class.

D A constructor is called at the time of use of a class.

Q35: Which of the following is correct about class and structure?

A class can have member functions while structure cannot.

B class data members are public by default while that of structure are private.

C Pointer to structure or classes cannot be declared.

D class data members are private by default while that of structure are public by default.

Q36:
Which inheritance type is used in the class given below?
class A : public X, public Y
{}

A Multilevel inheritance

B Multiple inheritance

C Hybrid inheritance

D Hierarchical Inheritance

Q37: Which of the following statements is correct in C++?

A Classes cannot have data as protected members.

B Structures can have functions as members.

C Class members are public by default.

D Structure members are private by default.

Q38: How many instances of an abstract class can be created?

A 1

B 5

C 13

D 0

Q39: Which of the following ways are legal to access a class data member using this pointer?

A this->x

B this.x

C *this.x

D *this-x

Q40: Which of the following concepts provides facility of using object of one class inside another class?

A Encapsulation

B Abstraction

C Composition

D Inheritance

Q41: Which of the following is not a type of inheritance?

A Multiple

B Multilevel

C Distributive

D Hierarchical

Q42:
Which one of the following is correct about the statements given below?
  1. All function calls are resolved at compile-time in Procedure Oriented Programming.
  2. All function calls are resolved at compile-time in OOPS.

A Only II is correct.

B Both I and II are correct.

C Only I is correct.

D Both I and II are incorrect.

Q43: Which of the following concepts is used to implement late binding?

A Virtual function

B Operator function

C Const function

D Static function

Q44: 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

Q45: Which of the following concepts means wrapping up of data and functions together?

A Abstraction

B Encapsulation

C Inheritance

D Polymorphism

Q46: Which of the following is an abstract data type?

A int

B double

C string

D Class

Q47: Which of the following functions are performed by a constructor?

A Construct a new class

B Construct a new object

C Construct a new function

D Initialize objects

Q48: Which of the following access specifier is used as a default in a class definition?

A protected

B public

C private

D friend

Q49: Which of the following is an invalid visibility label while inheriting a class?

A public

B private

C protected

D friend

Q50: Which one of the following is the correct way to declare a pure virtual function?

A virtual void Display(void){0};

B virtual void Display = 0;

C virtual void Display(void) = 0;

D void Display(void) = 0;

Q51: 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

Q52: 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.

Q53: What happens if the base and derived class contains definition of a function with same prototype?

A Compiler reports an error on compilation.

B Only base class function will get called irrespective of object.

C Only derived class function will get called irrespective of object.

D Base class object will call base class function and derived class object will call derived class function.

Q54: Which of the following operators cannot be overloaded?

A []

B []

C ?:

D *

Q55: Which of the following keyword is used to overload an operator?

A overload

B operator

C friend

D override

Q56: Which of the following concepts of OOPS means exposing only necessary information to client?

A Encapsulation

B Abstraction

C Data hiding

D Data binding

Q57: Which of the following statements is correct?

A Base class pointer cannot point to derived class.

B Derived class pointer cannot point to base class.

C Pointer to derived class cannot be created.

D Pointer to base class cannot be created.


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