Object Oriented Programming MCQs

Page No. 82

Which concept is needed because of implicit type casting use?


aStatic binding


bDynamic binding


cCompile time binding


d Source code binding


View Answer Dynamic binding

Upcasting is _____________________ without an explicit type cast.


aAlways allowed for public inheritance


bAlways allowed for protected inheritance


cAlways allowed for private inheritance


dNot allowed



If class C inherits class B and class B inherits class A ________________


a Class C object can be upcasted to object of class B only


bClass C object can be upcasted to object of class A only


c Class C object can be upcasted to object of either class A or B


dClass C object can’t be upcasted



If multiple inheritance is implemented, which upcasting will be correct?


aUpcast to first base class listed in inheritance


b Upcast to send base class listed in inheritance


cUpcast to any base class


dUpcast is not possible



Which casting among the following is allowed for the code given below?


aCasting 1


bCasting 2


ccasting 1 and casting 2


dcasting 1 nor casting 2


View Answer Casting 2

Upcasting and downcasting objects are the same as casting primitive types.


a True


bFalse


cA & B


d None of the above


View Answer False

Which property is shown most when upcasting is used?


aCode reusability


bCode efficiency


cComplex code simple syntax


d Encapsulation



Which among the following is the best situation to use upcasting?


aFor general code dealing with only subtype


bFor general code dealing with only supertype


cFor general code dealing with both the supertype and subtype


d For writing a rigid code with respect to subtype



Which among the following is safe?


aUpcasting


bDowncasting


cBoth upcasting and downcasting


dIf upcasting is safe then downcasting is not, and vice versa


View Answer Upcasting

Which among the following is true for upcasting in inheritance?


aDownward to the inheritance tree


bUpward to the inheritance tree


cEither upward or downward


dDoesn’t apply on inheritance



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