Share Facebook Email Telegram WhatsApp Results #1. A radioactive element emits an alpha particle. The mass number of the element , after emission ___________. Remains unchanged Remains unchanged Increases by one Increases by one Increases by three Increases by three Decreases by four Decreases by four #2. The velocity of neutron in a nuclear reactor is retarded by ________. Ordinary water Ordinary water Heavy water Heavy water Mercury Mercury Alchohol Alchohol #3. Gamma - ray photons have ___________. No mass and no electric charge No mass and no electric charge No mass and an electric charge of +1 No mass and an electric charge of +1 No mass and an electric charge of +2 No mass and an electric charge of +2 No mass and an electric charge of -1 No mass and an electric charge of -1 #4. Natural radioactivity was discovered by _____ Rutherford Rutherford Becquerel Becquerel Curie Curie Schmidt Schmidt #5. A particle which is similar to electron is __________. Positron Positron Beta particle Beta particle Photon Photon Mason Mason #6. In Alpha Decay _____________. Z and A are unchanged Z and A are unchanged Z decreases by 4 and A decreases by 2 Z decreases by 4 and A decreases by 2 Z decreases by 2 and A decrease by 4 Z decreases by 2 and A decrease by 4 Z decreases by 4 and A decreases by 4 Z decreases by 4 and A decreases by 4 #7. A device used for the measurement of radioactivity is __________. Mass spectrometer Mass spectrometer Cyclotron Cyclotron Nuclear reactor Nuclear reactor Duralumin Duralumin #8. Hydrogen bomb is based on the principle of __________ Nuclear fission Nuclear fission Nuclear fusion Nuclear fusion Natural radioactivity Natural radioactivity Artificial radioactivity Artificial radioactivity #9. Phenomena of radioactivity was discovered by Henri Becquerel in ______________. 1896 1896 1895 1895 1894 1894 1893 1893 #10. Elements undergo radioactive decay when proton number becomes greater than _____________. 50 50 40 40 82 82 73 73 Finish
