Object Oriented Programming MCQs

Page No. 9

While using encapsulation, which among the following is possible?


aCode modification can be additional overhead

✖


bData member’s data type can be changed without changing any other code

✓


cData member’s type can’t be changed, or whole code have to be changed

✖


dMember functions can be used to change the data type of data members

✖


View Answer Data member’s data type can be changed without changing any other code

If data members are private, what can we do to access them from the class object?


aCreate public member functions to access those data members

✓


bCreate private member functions to access those data members

✖


cCreate protected member functions to access those data members

✖


d Private data members can never be accessed from outside the class

✖


View Answer Create public member functions to access those data members

Which among the following best describes encapsulation?


aIt is a way of combining various data members into a single unit

✖


bIt is a way of combining various member functions into a single unit

✖


cIt is a way of combining various data members and member functions into a single unit which can operate on any data

✖


dIt is a way of combining various data members and member functions that operate on those data members into a single unit

✓


View Answer It is a way of combining various data members and member functions that operate on those data members into a single unit

Using higher degree of abstraction __________


aMay get unsafe

✖


bMay reduce readability

✖


cCan be safer

✓


dCan increase vulnerability

✖


View Answer Can be safer

Which among the following is not a level of abstraction?


aLogical level

✖


bPhysical level

✖


cView level

✖


dExternal level

✓


View Answer External level

A phone is made up of many components like motherboard, camera, sensors and etc. If the processor represents all the functioning of phone, display shows the display only, and the phone is represented as a whole. Which among the following have highest level of abstraction?


aMotherboard

✖


bDisplay

✖


cCamera

✖


dPhone

✓


View Answer Phone

If two classes combine some private data members and provides public member functions to access and manipulate those data members. Where is abstraction used?


aUsing private access specifier for data members

✖


bUsing class concept with both data members and member functions

✖


cUsing public member functions to access and manipulate the data members

✓


dData is not sufficient to decide what is being used

✖


View Answer Using public member functions to access and manipulate the data members

In terms of stream and files ____________


aAbstraction is called a stream and device is called a file

✓


bAbstraction is called a file and device is called a stream

✖


cAbstraction can be called both file and stream

✖


dAbstraction can’t be defined in terms of files and stream

✖


View Answer Abstraction is called a stream and device is called a file

Encapsulation and abstraction differ as ____________


aBinding and Hiding respectively

✓


bHiding and Binding respectively

✖


cCan be used any way

✖


dHiding and hiding respectively

✖


View Answer Binding and Hiding respectively

Higher the level of abstraction, higher are the details.


aTrue

✖


bFalse

✓


cA & B

✖


d None of these

✖


View Answer False

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