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Chapter 7 RADIO ACTIVITY MCQs

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1. Radioactivity was discovered in the year





2. Gamma rays can be stopped by





3. Non-radioactive substance becomes radioactive on bombardment of proton or neutron





4. Alpha rays can be blocked by placing Aluminum plate in their path





5. Atomic bomb is an example of





6. Ice packed in an airtight stainless steel bottle is a type of system





7. Velocity of alpha rays is





8. Thickness of Aluminum plate needed to stop alpha rays





9. Hydrogen bomb’s principal reaction is





10. The charge on alpha particle is





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