Nuclear Engineering Question: Which one is radioactive in nature? A. Helium B. Deuterium C. Heavy hydrogen D. Tritium Nuclear Engineering Interview QuestionAnswer: Option D Previous QuestionNext Question__________ have the same mass number, but different nuclear charge. A. Isotopes B. Isobars C. Isotones D. none of theseThe most commonly used nuclear fuel in boiling water reactor is A. enriched uranium B. natural uranium C. plutonium D. monazite sand