In the name of ALLAH, The most powerful, kind and the creator of all creations. Without Almighty nothing is possible, so we owe the successful completion of our work to Almighty ALLAH for HIS grace and blessing. We would like to firstly acknowledge Dr. Naveed Iqbal (Professor, Jamia Millia Islamia) for his encouraging guidance, untiring efforts, valuable suggestions, and moral support at all times throughout our career and work. We express our heartiest thanks to our parents and other family members especially Mrs. Maala Begum, Mr Ali Mohd Fafoo, Mr. Gh Nabi Fafoo, Mrs. Rafeeka Begum, Mrs. Shafeeka Begum, Mrs. Dilshada, Ajaz Ali, Umer Nabi, Shahid Nabi, Aamir Zaffer, Danish Anjum, Ather Rayess, Ubaid Kaiser, Kounser Nabi, Mohd Imran, Jan Mohd, Aaliya, Rubeeena, Bilal Khanday and Asmat Jaan for their care, moral support and coherence. We are also very much thankful to all our friends like Mr.Asif Tantray, Dr. Mudasir Tantray, Dr. Ajaz, Mr. Ajaz Lone, Mr. Shamsudin, Mr.Suhail Yousuf, Mr.Waseem Qayoom, Dr. Masood, Mr.Umer lone, Samullah Sultan and Dr. Shah Sajad Hyder for their valuable suggestions, encouragement, and support throughout the whole work. Finally, we also appreciate all the authors of consulted books and other publications whose precious work guided us very much to complete this assignment successfully...