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An atom bomb works on the principle of

A. Nuclear fission

B. Nuclear fusion

C. Both the nuclear fission & fusion

D. Ionisation

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  5. Propulsion of rocket follows from the
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  15. Chromium molybdenum steel cannot be welded using __________ welding.
  16. __________ is the hardest material out of the following.
  17. The substance used as a smoke screen in warfare is
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