Chapter 7 RADIO ACTIVITY MCQs 10 min Score: 0 Attempted: 0/10 Subscribe 1. Radioactivity was discovered in the year (A) 1896 (B) 1938 (C) 1911 (D) 1913Show All Answers 2. Gamma rays can be stopped by (A) 0.01 mm Al (B) 1 cm Al (C) Not by 6 cm Pb (D) 3 cm PbShow All Answers 3. Non-radioactive substance becomes radioactive on bombardment of proton or neutron (A) Natural radioactivity (B) Fission (C) Artificial radioactivity (D) None of theseShow All Answers 4. Alpha rays can be blocked by placing Aluminum plate in their path (A) 0.01 mm thick (B) 0.1 mm thick (C) 1.00 mm thick (D) 100 mm thickShow All Answers 5. Atomic bomb is an example of (A) Fission reaction (B) Fusion reaction (C) Endothermic (D) All of theseShow All Answers 6. Ice packed in an airtight stainless steel bottle is a type of system (A) Open system (B) Closed system (C) Isolated system (D) Isothermal systemShow All Answers 7. Velocity of alpha rays is (A) Equal to velocity of light (B) 10 times that of velocity of light (C) 1/10 of the velocity of light (D) 100 times velocity of lightShow All Answers 8. Thickness of Aluminum plate needed to stop alpha rays (A) 1 cm (B) 0.01 cm (C) 0.1 cm (D) 10 cmShow All Answers 9. Hydrogen bomb’s principal reaction is (A) Fission (B) Fusion (C) Combustion (D) All of theseShow All Answers 10. The charge on alpha particle is (A) +1 (B) +2 (C) −1 (D) NeutralShow All Answers
