Which of the following rays are the most penetrating? A) Alpha rays B) Beta rays C) Gamma rays D) None of these Related MCQs: The X rays diffraction studies by …… played key role to the discovery of DNA structure? Which of the following Asian countries is landlock? Which of the following countries is situated in Africa? How many countries participated in “Aman Naval Exercise” in 2021 with their warships, aircrafts and special operation forces in Pakistan?