Paytm Programming Sample paper: 1) A copy constructor is called. a. when an object is returned by value
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1 Paytm Programming Sample paper: 1) A copy constructor is called a. when an object is returned by value b. when an object is passed by value as an argument c. when compiler generates a temporary object d. all the above 2) Which property of Object Oriented Programming is exhibited by the code: #include< iostream> class quest public: float add( float a, float b) cout << The sum is: ; reurn(a+b); int add( int a, int b, int c) cout << The sum is: ; return(a+b+c); int add( int a, int b=0) cout << The sum is: ; return(a+b); ;
2 int main( ) quest q q. add( 50.5, 48.2) q. add( 42, 56, 82) q. add( 23) return 0; a. Compile time polymorphism b. Run time polymorphism c. Both 3) Give output of the following: #include <iostream> using namespace std; class exam private: int x, y, z; public: int testcase( ) x=50; y=20; z=30; friend int add( exam e);
3 ; int add( exam e) return int( e.x+ e.y+ e.z); int main( ) exam a; a.testcase( ); cout << add(a); return 0; a. 0 b. compile time error c ) Why is user defined copy constructor required? a. there is no implicit copy constructor in C++ b. when pointers are involved implicit copy constructor does not give correct result c. both a and b 5) Virtual keyword is used a. to remove static linkages b. to call function based on kind of object it is being called for
4 c. to call the methods that don't exist at compile time d. all the above 6) Dynamic dispatch is a feature that a. selects which polymorphic operation to call at run time b. selects which polymorphic operation to call at compile time c. Both a and b d. None 7) Encapsulation helps a. information hiding b. in providing low coupling c. in providing high cohesion d. All the above 8) The keyword 'this' is used a. As reference to current object b. Explicit constructor invocation c. In open recursion d. All the above 9) An Abstract class a. allows normal method declaration within b. can be instantiated c. Must have abstract methods with implemetation within 10) Function Templates can have a. Explicit instantiation definition with template argument for all parameters b. explicit instantiation of declaration with template argument for all parameters c. Both a and b d. None
5 11) Function templates are considered equivalent when a. Declared in same scope b. Having same name c. Having identical return type and parameter list d. All of the above 12) Pure virtual function is used a. to give meaning to derived class function b. to give meaning to base class function c. to initialize all functions d. None 13) Use of preprocessor directive in OOP a. for conditional compilation b. for macro expansion c. error and warning reporting d. all the above 14) Abstract class vs Interface a. A class may inherit only one abstract class but may inherit several interfaces. b. An abstract class can provide complete and default code but an interface has no code c. both a and b 15) Constructor chaining is a. subclass constructor calling super class constructor b. super class constructor calling subclass constructor c. both 16) Invoking methods characteristics a. methods can be invoked in any order and calling method should be in same class as worker method
6 b. Worker method and calling method can be invoked in same way c. Any method can call any method 17) Which Java.Lang contains only static methods? a. Math,System b. Number,Exception c. There is no such class 18) Overloaded methods in java a. Compiler uses method signature to determine which method to invoke. They may have different functionality b. They are not available in fundamental classes c. They have the same name and signature 19) Fallthrough in a switch case statement a. prevents the next case after the matching block to be executed b. Allows the next case after the matching block to be executed c. no fallthorugh occurs in switch case 20) Break statement in switch case a. prevents from fallthrough b. causes an exit from innermost loop c. both a and b
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