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1) If a radioactive element has a half-life of 40 minutes. The initial count rate was 1000 per minute, then how long will it take for the count rate to drop to 125 per minutes a. 120 minutes b. 90 minutes c. 30 minutes d. 60 minutes
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2) Most of the nuclei with atomic number 1 to 82 are a. positive nuclei b. negative nuclei c. unstable nuclei d. stable nuclei
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3) A compound containing some amount of radioisotope is a. tracer b. radioactive compound c. non radioactive d. linear active compound
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4) The number of neutrons in the nucleus is called a. neutron number (N) b. atomic number (Z) c. atomic mass number (A) d. electron number (E)
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5) The fast-moving light photons are a. alpha radiation b. gamma radiation c. beta radiations d. no radiations
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6) The number of protons and neutrons in the nucleus is called a. neutron number (N) b. atomic number (Z) c. atomic mass number (A) d. electron number (E)
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7) In alpha decay (α-decay) the proton number of the parent nuclide a. increases by 2 b. increases by 1 c. decreases by 2 d. decreases by 4
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8) What fraction of the original sample will be after 22 years, if the Cobalt-50 is a radioactive element with a half-life of 4.3 years? a. 1⁄32 b. 1⁄16 c. 1⁄8 d. 1⁄4
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9) In nuclear fission, as compared to the original mass of the heavy nucleus, the total mass of the product is a. equal b. more c. less d. zero
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10) If the activity of a sample of radioactive bismuth decreases to 1/8 of its original activity in 15 days, then the sample's half-life will be a. 3 days b. 10 days c. 5 days d. 7 days
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11) In fission, the mass of products is a. less than original nucleus b. more than original nucleus c. equal to original nucleus d. all of above
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12) The radiation which strongly interacts with the matter due to its charge and has a short-range as compared to gamma radiations is a. alpha radiation b. beta radiation c. no radiation d. gamma radiation
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13) The radiation which primarily consists of protons, electrons, alpha particles, and large nuclei are called a. environmental radiations b. background radiations c. positive radiations d. cosmic radiations
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14) The half-life of Carbon-14 is a. 23 years b. 1000 years c. 1200 years d. 5730 years
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15) A process in which heavy nucleus splits into two by bombarding a slow-moving neutron is called a. radioactivity b. nuclear fusion c. nuclear fission d. nuclear splitting
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16) A stream of high energy electrons is the a. alpha radiation b. gamma radiation c. beta radiations d. no radiations
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17) Radium-226 has a half-life of a. 1160 years b. 1340 years c. 1580 years d. 1620 years
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18) The radiations that can ionize the matter are a. alpha radiations b. gamma radiations c. beta radiations d. all of above
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19) Technimum-99 has a half-life of 6 hours. If there is 300 mg of it, how much will be left in 48 hours? a. 1.58 mg b. 1.25 mg c. 1.17 mg d. 2.56 mg
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20) The phenomenon in which radiations split matter into ions is called a. denaturing b. ionization c. condensation d. atomization
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