1) Which particles inside an atom have a positive charge? a) protons b) neutrons c) electrons 2) Which particles inside an atom have a negative charge? a) protons b) neutrons c) electrons 3) When an atom gains an electron it becomes a ..... a) positive ion b) negative ion c) neutral ion 4) When an atom loses an electron it becomes a ..... a) positive ion b) negative ion c) neutral ion 5) proton number is the same as the neutron number a) True b) False 6) mass number is the number of neutrons and protons added together a) True b) False 7) An alpha particle is the equivalent of a .......... a) hydrogen nucleus b) helium nucleus c) oxygen nucleus d) lithium nucleus 8) a beta particle is an _______ emitted from the nucleus a) proton b) neutron c) electron d) neither of the above 9) Alpha can be stopped by ........ a) lead b) aluminium c) paper d) neither of the above 10) Beta can be stopped by ........ a) paper b) aluminium c) lead 11) Gamma can be reduced by ......... a) aluminium b) paper c) lead 12) Gamma radiation is the most ionising radiation a) True b) False 13) Alpha is the most ionising radiation a) True b) False 14) Fission reactions take place in ..... a) when nuclei come together as in stars b) take place in nuclear reactors c) neither of the above 15) Fusion reactions take place in ..... a) when nuclei come together as in stars b) take place in nuclear reactors c) neither of the above 16) Fission of U - 235 produces the following ..... a) 3 daughter nuclei, energy & more neutrons b) 2 daughter nuclei, energy & neutrons c) 1 daughter nuclei, energy & neutrons 17) Thermal energy from a chain reaction is converted into ________ energy in nuclear power station. a) kinetic b) electrical c) potential d) light 18) Chain reactions are controlled by .......... a) heat rods b) control rods c) neither of the above 19) Nuclear fusion does not happen at low temperatures & pressures due to .... (H) a) electrostatic attraction of protons b) electrostatic replusion of protons c) electrostatic repulsion of neutrons 20) Very ___ temperatures are required for the fusion of hydrogen which is difficult to creat on Earth a) high b) low c) very low

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