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MCS-024 Object Oriented Technologies and Java Programming Solved Assignment 2019-2020 Q1. (a)   Explain basic concepts of Object Oriented Programming? Explain how data hiding is achieved.    Answer:- Object-Oriented Programming is a methodology or paradigm to design a program using classes and objects. It simplifies the software development and maintenance by providing some concepts: ·          Object -  Any entity that has state and behaviour is known as an object. An Object can be defined as an instance of a class. ·          Class -  Collection of objects is called class. It is a logical entity. A class can also be defined as a blueprint from which you can create an individual object. Class doesn't consume any space. ·          Inheritance -  When one object acquires all the properties and behaviours of a parent object, it is known as inheritance. ·          Polymorphism -  If one task is performed by different ways, it is known as polymorphism. In Java, we use

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Q1. (a) What is the need of modulating a signal? Will it be a right approach to send the    information as the signal itself?    Ans:   Modulation is the process of mixing a low energy message signal with the high energy carrier signal to produce a new high energy signal which carries information to a long distance. Modulation is the process of changing the characteristics (amplitude, frequency or phase) of the carrier signal, in accordance with the amplitude of the message signal. A device that performs modulation is called modulator.  Need for Modulation Modulation is extremely necessary in communication system because of the following reasons: 1) Avoids mixing of signals 2) Increase the range of communication 3) Wireless communication 4) Reduces the effect of noise 5) Reduces height of antenna Q1.  (b) Explain techniques used in digital to analog modulation with the help of diagram. Ans: Coming Soon... Q2. (a) Discuss the different approaches to circuit switch