Problem: What year saw the nationalization of British Railways?
Answer: 1948

Problem: What is infant whale commonly called?
Answer: calf

Problem: Which Polynesian island was originally called Rapa Nui before it was discovered by Dutch explorer Jacob Roggeeven in 1722?
Answer: easter island

Problem: """A floating object displaces its own weight in fluid"" is essentially what principle?"
Answer:
archimedes principle