Object Oriented Programming(OOP) Solved MCQs

What will be the output of following program? #include<iostream.h> void main() { float x; x=(float)9/2; cout<<x; } 4.5 4.0 4 5       _____________________________________________________________________________________
The term __________ means the ability to take many forms. Inheritance Polymorphism Member function Encapsulation       _____________________________________________________________________________________
Runtime polymorphism is achieved by Friend function Virtual function Operator overloading Function overloading       _____________________________________________________________________________________
Access to private data Restricted to methods of the same class Restricted to methods of other classes Available to methods of the same class and other classes Not an issue because the program will not compile       _____________________________________________________________________________________
Additional information sent when an exception is thrown may be placed in The throw keyword The function that caused the error The catch block An object of the exception class       _____________________________________________________________________________________
A static data member is given a value Within the class definition Outside the class definition When the program is exeuted Never       _____________________________________________________________________________________
What will be the result of the expression 13 & 25? 38 25 9 12       _____________________________________________________________________________________
In a class specifier ,data or function designated private are accessible To any function in the program Only if you the password To member functions of that class Only to public members of the class       _____________________________________________________________________________________
Which of the statements are true ? I. Function overloading is done at compile time. II. Protected members are accessible to the member of derived class. III. A derived class inherits constructors and destructors. IV. A friend function can be called like a normal function. V. Nested class is a derived class. I, II, III II, III, V III, IV, V I, II, IV       _____________________________________________________________________________________
At which point of time a variable comes into existence in memory is determined by its Scope Storage class Data type All of the above       _____________________________________________________________________________________
When the compiler cannot differentiate between two overloaded constructors, they are called Overloaded Destructed Ambiguous Dubious       _____________________________________________________________________________________
The actual source code for implementing a template function is created when The declaration of function appears. The function is invoked. The definition of the function appears. None of the above.       _____________________________________________________________________________________
Usually a pure virtual function Has complete function body Will never be called Will be called only to delete an object Is defined only in derived class       _____________________________________________________________________________________
Which of the following is the valid class declaration header for the derived class d with base classes b1 and b2? class d : public b1, public b2 class d : class b1, class b2 class d : public b1, b2 class d : b1, b2       _____________________________________________________________________________________
The process of extracting the relevant attributes of an object is known as Polymorphism Inheritence Abstraction Data hiding       _____________________________________________________________________________________
What features make C++ so powerful ? Easy implementation Reusing old code Reusing old code All of the above       _____________________________________________________________________________________
Which of the following operator can be overloaded through friend function? -> = ( ) *       _____________________________________________________________________________________
The keyword friend does not appear in The class allowing access to another class The class desiring access to another class The private section of a class The public section of a class       _____________________________________________________________________________________
Exception handling is targeted at Run-time error Compile time error Logical error All of the above       _____________________________________________________________________________________
Function templates can accept Any type of parameters Only one parameter Only parameters of the basic type Only parameters of the derived type       _____________________________________________________________________________________
If the variable count exceeds 100, a single statement that prints “Too many” is if (count<100) cout << “Too many”; if (count>100) cout >> “Too many”; if (count>100) cout << “Too many”; None of these.       _____________________________________________________________________________________
The mechanism that binds code and data together and keeps them secure from outside world is known as Abstraction Inheritance Encapsulation Polymorphism       _____________________________________________________________________________________
The operator << when overloaded in a class must be a member function must be a non member function can be both (A) & (B) above cannot be overloaded       _____________________________________________________________________________________
To access the public function fbase() in the base class, a statement in a derived class function fder() uses the statement.fbase(); fbase(); fder(); base::fbase(); der::fder();       _____________________________________________________________________________________
In which case is it mandatory to provide a destructor in a class? Almost in every class Class for which two or more than two objects will be created Class for which copy constructor is defined Class whose objects will be created dynamically       _____________________________________________________________________________________
_________ members of a base class are never accessible to a derived class. Public Private Protected A,B and C       _____________________________________________________________________________________
What is the error in the following code? class t { virtual void print(); } No error Function print() should be declared as static. Function print() should be defined. Class t should contain data members.       _____________________________________________________________________________________
It is possible to declare as a friend A member function A global function A class All of the above       _____________________________________________________________________________________
A struct is the same as a class except that There are no member functions All members are public Cannot be used in inheritance hierarchy It does have a this pointer       _____________________________________________________________________________________
C++ was originally developed by Clocksin and Melish Donald E.Knuth Sir Richard Hadlee Bjarne Stroustrup       _____________________________________________________________________________________
What is the output of the following code char symbol[3]={‘a’,‘b’,‘c’}; for (int index=0; index<3; index++) cout << symbol [index]; a b c “abc” abc ‘abc’       _____________________________________________________________________________________
If we create a file by ‘ifstream’, then the default mode of the file is _________ ios :: out ios :: in ios :: app ios :: binary       _____________________________________________________________________________________
The following can be declared as friend in a class An object A class A public data member A private data member       _____________________________________________________________________________________
The polymorphism can be characterized by the phrase One interface,multiple methods Multiple interfaces,one method One interface,one method None of the above       _____________________________________________________________________________________
A virtual class is the same as An abstract class A class with a virtual function A base class None of the above       _____________________________________________________________________________________
Member functions, when defined within the class specification Are always inline Are not inline Are inline by default, unless they are too big or too complicated Are not inline by default.       _____________________________________________________________________________________
Assume that we have constructor functions for both base class and derived class. Now consider the declaration in main( ). Base * P = New Derived; in what sequence will the constructor be called ? Derived class constructor followed by Base class constructor. Base class constructor followed by derived class constructor. Base class constructor will not be called. Base class constructor will not be called.       _____________________________________________________________________________________
The operator that cannot be overloaded is ++ : : ~ ( )       _____________________________________________________________________________________
Which of the following declarations are illegal? void *ptr; char *str = “hello”; char str = “hello”; const *int p1;       _____________________________________________________________________________________
Identify the operator that is NOT used with pointers -> & * >>       _____________________________________________________________________________________
Which of the following statements is NOT valid about operator overloading? Only existing operators can be overloaded Overloaded operator must have at least one operand of its class type The overloaded operators follow the syntax rules of the original operator None of the above       _____________________________________________________________________________________
Overloading a postfix increment operator by means of a member function takes No argument One argument Two arguments Three arguments       _____________________________________________________________________________________
Which of the following will produce a value 10 if x = 9.7? floor(x) abs(x) log(x) ceil(x)       _____________________________________________________________________________________
Which of the following is not the characteristic of constructor? They should be declared in the public section. They do not have return type. They can not be inherited. They can be virtual.       _____________________________________________________________________________________
You may override the class access specifiers Public members Public and protected members Any specific class members you choose No class members       _____________________________________________________________________________________
You separated a derived class name from its access specifier with A colon Two colons Atleast one space A semi colon       _____________________________________________________________________________________
Consider the following statements: int x = 22,y=15; x = (x>y) ? (x+y) : (x-y); What will be the value of x after executing these statements? 22 37 7 5       _____________________________________________________________________________________
A friend function to a class, C cannot access Private data members and member functions Public data members and member functions Protected data members and member functions The data members of the derived class of C       _____________________________________________________________________________________
The members of a class by default are Public Protected Private Mandatory to specify       _____________________________________________________________________________________
If x =5, y =2 then x ^y equals________. (where ^ is a bitwise XOR operator) 00000111 10000010 10100000 11001000       _____________________________________________________________________________________