PPSC Assistants / Head Clerk (BS-16) Local Government 2020, Islamic Studies MCQs, PPSC Solved Past Papers MCQsWhich Caliph of the following Caliphs launched the Postal department?A. Hazrat Abu Bakr R.A B. Hazrat Umar R.A C. Hazrat Usman R.A D. Hazrat Ali R.A Who was called Sword of Allah?Who among the following was the first woman martyr of Islam?