Quiz-1

June 23, 2019

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Question 1

Time: 00:00:00

Which among the following best describes polymorphism?

It is the ability for a message/data to be processed in more than one form

It is the ability for a message/data to be processed in only 1 form

It is the ability for many messages/data to be processed in one way

It is the ability for undefined message/data to be processed in at least one way

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Explanation: It is actually the ability for a message / data to be processed in more than one form. The word polymorphism indicates many-forms. So if a single entity takes more than one form, it is known as polymorphism.

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Question 2

Time: 00:00:00

What do you call the languages that support classes but not polymorphism?

Class based language

Procedure Oriented language

Object-based language

If classes are supported, polymorphism will always be supported

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Explanation: The languages which support classes but doesn’t support polymorphism, are known as object-based languages. Polymorphism is such an important feature, that is a language doesn’t support this feature, it can’t be called as a OOP language.

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Question 3

Time: 00:00:00

Which among the following can show polymorphism?

Overloading ||

Overloading +=

Overloading <<

Overloading &&

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Explanation: Only insertion operator can be overloaded among all the given options. And the polymorphism can be illustrated here only if any of these is applicable of being overloaded. Overloading is type of polymorphism.

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Question 4

Time: 00:00:00

Which among the following is the language which supports classes but not polymorphism?

SmallTalk

Java

C++

Ada

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Explanation: Ada is the language which supports the concept of classes but doesn’t support the polymorphism feature. It is an object-based programming language. Note that it’s not an OOP language.

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Question 5

Time: 00:00:00

If same message is passed to objects of several different classes and all of those can respond in a different way, what is this feature called?

Inheritance

Overloading

Polymorphism

Overriding

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Explanation: The feature defined in question defines polymorphism feature. Here the different objects are capable of responding to the same message in different ways, hence polymorphism.

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Question 6

Time: 00:00:00

Which class/set of classes can illustrate polymorphism in the following code:

abstract class student

{

   public : int marks;

   calc_grade();

}

class topper:public student

{

    public : calc_grade()

    { 

        return 10; 

    }

};

class average:public student

{ 

     public : calc_grade()

     {

         return 20; 

     }

};

class failed{ int marks; };

Only class student can show polymorphism

Only class student and topper together can show polymorphism

All class student, topper and average together can show polymorphism

Class failed should also inherit class student for this code to work for polymorphism

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Explanation: Since Student class is abstract class and class topper and average are inheriting student, class topper and average must define the function named calc_grade(); in abstract class. Since both the definition are different in those classes, calc_grade() will work in different way for same input from different objects. Hence it shows polymorphism.

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Question 7

Time: 00:00:00

Which type of function among the following shows polymorphism?

Inline function

Virtual function

Undefined functions

Class member functions

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Explanation: Only virtual functions among these can show polymorphism. Class member functions can show polymorphism too but we should be sure that the same function is being overloaded or is a function of abstract class or something like this, since we are not sure about all these, we can’t say whether it can show polymorphism or not.

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Question 8

Time: 00:00:00

In case of using abstract class or function overloading, which function is supposed to be called first?

Local function

Function with highest priority in compiler

Global function

Function with lowest priority because it might have been halted since long time, because of low priority

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Explanation: Function with highest priority is called. Here, it’s not about the thread scheduling in CPU, but it focuses on whether the function in local scope is present or not, or if scope resolution is used in some way, or if the function matches the argument signature. So all these things define which function has the highest priority to be called in runtime. Local function could be one of the answer but we can’t say if someone have used pointer to another function or same function name.

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Question 9

Time: 00:00:00

Which among the following can’t be used for polymorphism?

Static member functions

Member functions overloading

Predefined operator overloading

Constructor overloading

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Explanation: Static member functions are not property of any object. Hence it can’t be considered for overloading/overriding. For polymorphism, function must be property of object, not only of class.

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Question 10

Time: 00:00:00

What is output of the following program?

class student

{ 

    public : int marks; 

	void disp() 

	{ 

		cout<<”its base class”

	};

	class topper:public student

	{

		public : 

		void disp()

		{ 

			cout<<”Its derived class”; 

		}

	}

	void main() { student s; topper t;

	s.disp();

	t.disp();

}

Its base classIts derived class

Its base class Its derived class

Its derived classIts base class

Its derived class Its base class

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Explanation: You need to focus on how the output is going to be shown, no space will be given after first message from base class. And then the message from derived class will be printed. Function disp() in base class overrides the function of base class being derived.

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["0","40","60","80","100"]

["Need more practice!","Keep trying!","Not bad!","Good work!","Perfect!"]