Object Oriented Programming MCQs

Page No. 14

What is the syntax of copy constructor?


a classname (classname &obj){ /*constructor definition*/ }

✖


bclassname (cont classname obj){ /*constructor definition*/ }

✖


cclassname (cont classname &obj){ /*constructor definition*/ }

✓


dclassname (cont &obj){ /*constructor definition*/ }

✖


View Answer classname (cont classname &obj){ /*constructor definition*/ }

If a class implements some dynamic memory allocations and pointers then _____________


a Copy constructor must be defined

✓


bCopy constructor must not be defined

✖


cCopy constructor can’t be defined

✖


dCopy constructor will not be used

✖


View Answer Copy constructor must be defined

If programmer doesn’t define any copy constructor then _____________


aCompiler provides an implicit copy constructor

✓


bCompiler gives an error

✖


cThe objects can’t be assigned with another objects

✖


dThe program gives run time error if copying is used

✖


View Answer Compiler provides an implicit copy constructor

Which returning an object, we can use ____________


aDefault constructor

✖


bZero argument constructor

✖


cParameterized constructor

✖


dCopy constructor

✓


View Answer Copy constructor

The copy constructors can be used to ________


aCopy an object so that it can be passed to a class

✖


bCopy an object so that it can be passed to a function

✓


cCopy an object so that it can be passed to another primitive type variable

✖


d Copy an object for type casting

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View Answer Copy an object so that it can be passed to a function

If two classes have exactly same data members and member function and only they differ by class name. Can copy constructor be used to initialize one class object with another class object?


a Yes, possible

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bYes, because the members are same

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cNo, not possible

✓


dNo, but possible if constructor is also same

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View Answer No, not possible

The copy constructor can be used to ____________


aInitialize one object from another object of same type

✓


bInitialize one object from another object of different type

✖


cInitialize more than one object from another object of same type at a time

✖


dInitialize all the objects of a class to another object of another class

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View Answer Initialize one object from another object of same type

Copy constructor is a constructor which ________________


aCreates an object by copying values from any other object of same class

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bCreates an object by copying values from first object created for that class

✖


cCreates an object by copying values from another object of another class

✖


dCreates an object by initializing it with another previously created object of same class

✓


View Answer Creates an object by initializing it with another previously created object of same class

Which is correct syntax?


aclassname objectname= new() integer;

✖


bclassname objectname= new classname;

✖


cclassname objectname= new classname();

✓


dclassname objectname= new() classname();

✖


View Answer classname objectname= new classname();

What are we only create an object but don’t call any constructor for it in java?


aImplicit constructor will be called

✖


bObject is initialized to some null values

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cObject is not created

✖


dObject is created but points to null

✓


View Answer Object is created but points to null

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