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ZS Associate OOPs Questions and Answers Quiz-1

Question 1

Time: 00:00:00

Which was the first purely object oriented programming language developed?

Java

C++

SmallTalk

Kotlin

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Explanation: SmallTalk was the first programming language developed which was purely object oriented. It was developed by Alan Kay. OOP concept came into picture in 1970’s.

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Question 2

Time: 00:00:00

What is the additional feature in classes that was not in structures?

Data members

Member functions

Static data allowed

Public access specifier

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Explanation: Member functions are allowed inside a class but were not present in structure concept. Data members, static data and public access specifiers were present in structures too.

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Question 3

Time: 00:00:00

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?

Yes, possible

Yes, because the members are same

No, not possible

No, but possible if constructor is also same

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Explanation: The restriction for copy constructor is that it must be used with the object of same class. Even if the classes are exactly same the constructor won’t be able to access all the members of another class. Hence we can’t use object of another class for initialization

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Question 4

Time: 00:00:00

Copy constructor will be called whenever the compiler __________

Generates implicit code

Generates member function calls

Generates temporary object

Generates object operations

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Explanation: Whenever the compiler creates a temporary object, copy constructor is used to copy the values from existing object to the temporary object.

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Question 5

Time: 00:00:00

Which problem arises due to multiple inheritance, if hierarchical inheritance is used previously for its base classes?

Diamond

Circle

Triangle

Loop

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Explanation: The diamond problem arises when multiple inheritance is used. This problem arises because the same name member functions get derived into a single class. Which in turn creates ambiguity in calling those methods.

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Question 6

Time: 00:00:00

Can the derived class be made abstract if multiple inheritance is used ?

No, because other classes must be abstract too

Yes, if all the functions are implemented

Yes, if all the methods are predefined

No, since constructors won’t be there

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Explanation: The derived class must not be abstract. This is because the abstract classes doesn’t have constructor and hence we won’t be having capability to have instances. This will restrict use of multiple inheritance.

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Question 7

Time: 00:00:00

If 6 classes uses single level inheritance with pair classes (3 pairs), which inheritance will this be called?

Single

Multiple

Hierarchical

Multilevel

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Explanation: Here all the pairs are using single inheritance. And no different pairs are inheriting same classes. Hence it can’t be called hybrid or multilevel inheritance. You can say the single inheritance is used 3 times in that program.

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Question 8

Time: 00:00:00

class A

{  

	public : class B 

	{ 

		public : B(int i): data(i)

		{ 

		}

		int data;

	}

};

	class C: public A

{

	class D:public A::B{ };

};

Multi-level inheritance is used, with nested classes

Multiple inheritance is used, with nested classes

Single level inheritance is used, with enclosing classes

Single level inheritance is used, with both enclosing and nested classes

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Explanation: Class C is inheriting Class A. Class D is inheriting class B, both are nested. Hence it is single inheritance. For multiple inheritance, class C or D should have inherited both class A and class B.

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Question 9

Time: 00:00:00

Which among the following is true?

Two objects can point to the same memory location

Two objects can never point to the same memory location

Objects not allowed to point at a location already occupied

Objects can’t point to any address

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Explanation: When an object is created and instead of calling a constructor, another object is assigned to it. Both the objects point to the same memory location. This can be illustrated with help of return by reference.

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Question 10

Time: 00:00:00

class A

{

	public :int a;

}

class B:public A

{

	int b;

}

main()

{

	B b=new A();  //casting 1

	A a=new B();  //casting 2

}

Casting 1

Casting 2

Casting 1 & Casting 2

Casting 1 nor Casting 2

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Explanation: The casting 2 is correct. The objects casting must be done from derived class object to a parent class object. That is, the object of the superclass can be made an object of subclass only. Vice versa is not possible.

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