Object Oriented Programming MCQs

Page No. 55

The abstract methods can never be ___________ in a base class.


aPrivate


bProtected


cPublic


dDefault


View Answer Private

If a class have all the abstract methods the class will be known as ___________


aAbstract class


bAnonymous class


cBase class


dDerived class


View Answer Abstract class

Which among the following is correct for abstract methods?


aIt must have different prototype in the derived class


b It must have same prototype in both base and derived class


cIt must have different signature in derived class


dIt must have same return type only



Static methods can’t be made abstract in java.


aTrue


bFalse


cA & B


d None of the above


View Answer True

If a function declared as abstract in base class doesn’t have to be defined in derived class then ______


aDerived class must define the function anyhow


bDerived class should be made abstract class


c Derived class should not derive from that base class


dDerived class should not use that function



What is the syntax for using abstract method?


aabstractmethod_name (parameter)


babsmethod name (parameter)


cabstract return-type method name (parameter)


d abstract method name (parameter)



What is this feature of enforcing definitions of abstract function at compile time called?


aStatic polymorphism


bPolymorphism


c Dynamic polymorphism


dStatic or dynamic according to need



The abstract function definitions in derived classes is enforced at _________


aRuntime


bCompile time


cWriting code time


d Interpreting time


View Answer Compile time

It is ____________________ to define the abstract functions.


aMandatory for all the classes in program


bNecessary for all the base classes


cNecessary for all the derived classes


dNot mandatory for all the derived classes



How are abstract functions different from the abstract functions?


aAbstract must not be defined in base class whereas virtual function can be defined


bEither of those must be defined in base class


cDifferent according to definition


dAbstract functions are faster



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