1) Nuclei which do not emit radiations naturally are called a. unstable nuclei b. stable nuclei c. positive nuclei d. negative nuclei
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2) The chemical compounds to explore the metabolism of chemical reactions inside the human body, animals or plants containing some quantity of radioisotopes are called a. radioactive endoscope b. radioactive tracers c. radioactive fusion d. radioactive atoms
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3) The matter is built from small particles called a. radiant b. atoms c. isotopes d. ions
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4) Nuclei bombarded with protons, neutron or alpha particles are changed to a. isotopes b. radioisotopes c. element having atomic number less than 82 d. none of above
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5) The types of radiations emitted by the radioactive substance are a. 2 b. 4 c. 5 d. 3
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6) The artificially produced radioactive elements are known as a. ions b. radiant c. radioisotopes d. transmutations
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7) The rate of radioactive decay is proportional to the number of a. unstable nuclei b. unstable protons c. unstable electrons d. unstable atoms
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8) During the second half-life, the original material is decayed a. one quarter b. two quarter c. three quarter d. all of above
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9) The rate of radioactive decay is proportional to a. nature of rays b. no. of electron c. no. of protons d. no. of unstable nuclei
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10) In nuclear fusion, as compared to the masses of original nuclei, the final nucleus is always a. equal b. equal c. less d. zero
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11) The mass of neutron and proton is a. equal b. unequal c. zero d. undetermined
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12) In the atmosphere, a small amount is present of radioactive a. carbon-15 b. carbon-19 c. carbon-10 d. carbon-14
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13) Radiation that causes redness and sores on the skin is a. gamma only b. beta only c. alpha d. gamma and beta
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14) The radiations emitted by different elements are a. alpha b. beta c. gamma d. all of above
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15) In the air, the beta particle has a range of a. few centimeters b. several thousand meters c. several hundred meters d. several meters
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16) Nucleons are a collection of a. electrons and protons b. electrons and neutrons c. protons and neutrons d. protons and positrons
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17) Times a proton is heavier than an electron is a. 1827 b. 1876 c. 1836 d. 1789
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18) The temperature at the center of the Sun is nearly a. 20 million Kelvin b. 10 million Kelvin c. 30 million Kelvin d. 25 million Kelvin
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19) Ashes from a fire in the forest show carbon-14 activity of only 1/8 the activity of fresh wood. How long ago the forest had fire? a. 18590 years b. 17190 years c. 16580 years d. 14820 years
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20) The release of energy from the sun is due to a. nuclear fission b. nuclear fusion c. burning of gases d. chemical reaction
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