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  1. The following four wires are made of the same material. Which of these will have
  2. If a nucleus ᴢXᴬ emits 9α and 5β-particles, then the ratio of total protons and neutrons
  3. A stone falls freely under gravity. It covers distances h1, h2 and h3 in the first 5 secs
  4. A heavy nucleus at rest breaks into two fragments which fly off with velocities
  5. Nuclear fission is not found in