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In the name of Allah, the Most Gracious and the Most Merciful All praise and glory goes to Almighty Allah (Subhanahu Wa Ta’ala) who gave me the courage and patience to carry out this work. Peace and blessings of Allah be upon His last Prophet Muhammad (Sallulaho-Alaihe-Wassalam) and all his Sahaba (Razi-Allaho-Anhum) who devoted their lives towards the prosperity and spread of Islam. First and foremost gratitude is due to the esteemed university, the King Fahd University of Petroleum and Minerals for my admittance, and to its learned faculty members for imparting quality learning and knowledge with their valuable support and able guidance that has led my way through this point of undertaking my research work. My deep appreciation and heartfelt gratitude goes to my thesis advisor Dr. Asrar U.H. Sheikh for his constant endeavour, guidance and the numerous moments of attention he devoted throughout the course of this research work. His valuable sug-i