Canadian Citizenship Practice Test 2025 – 400 Free Practice Questions to Pass the Exam

Dr. John A. Hopps is credited with inventing the first cardiac pacemaker. This answer is correct because while the other options may represent significant inventions, they were not invented by Dr. Hopps. Option A, the Canadarm, was developed by the Canadian Space Agency and the National Research Council of Canada. Option B, a robotic arm used in manufacturing, was invented by George Devol. Option D, a new type of microscope, was invented by Ernst Ruska and Max Knoll. Therefore, the most accurate answer is C, the first cardiac pacemaker.