var questions = new Array();
var choices = new Array();
var answers = new Array();
var response = new Array();

questions[0] = "1) ... is not found in the nucleus of an atom.";
choices[0] = new Array();
choices[0][0] = "Proton";
choices[0][1] = "Neutron";
choices[0][2] = "Electron";

answers[0] = choices[0][2];

questions[1] = "2) ... is a secondary energy source.";
choices[1] = new Array();
choices[1][0] = "Coal";
choices[1][1] = "Electricity";
choices[1][2] = "Oil";

answers[1] = choices[1][1];

questions[2] = "3) This non renewable energy resource generates electricity.";
choices[2] = new Array();
choices[2][0] = "Wind";
choices[2][1] = "Hydroelectric";
choices[2][2] = "Natural gas";

answers[2] = choices[2][2];

questions[3] = "4) Beta radiation comes from the unstable nucleus.";
choices[3] = new Array();
choices[3][0] = "True";
choices[3][1] = "False";

answers[3] = choices[3][0];

questions[4] = "5) The risk of cancer increases if the exposure to ionising radiation ...";
choices[4] = new Array();
choices[4][0] = "decreases";
choices[4][1] = "stays the same";
choices[4][2] = "increases";

answers[4] = choices[4][2];

questions[5] = "6) The type of radiation that is stopped by a sheet of paper is ...";
choices[5] = new Array();
choices[5][0] = "alpha";
choices[5][1] = "beta";
choices[5][2] = "gamma";

answers[5] = choices[5][0];

questions[6] = "7) Higher tier only: Carbon-14 has a half-life of 5730 years. The mass of carbon-14 present in a sample is 6g initially. The mass that will be left after 2865 years is ...";
choices[6] = new Array();
choices[6][0] = "12 g";
choices[6][1] = "6 g";
choices[6][2] = "3 g";

answers[6] = choices[6][2];

questions[7] = "8) The type of radiation that is stopped by few cm of lead is ...";
choices[7] = new Array();
choices[7][0] = "alpha";
choices[7][1] = "beta";
choices[7][2] = "gamma";

answers[7] = choices[7][2];

questions[8] = "9) This type of radiation is used to keep paper at the same thickness ...";
choices[8] = new Array();
choices[8][0] = "alpha";
choices[8][1] = "beta";
choices[8][2] = "gamma";

answers[8] = choices[8][1];

questions[9] = "10) The most common fuel used in a nuclear power station is ...";
choices[9] = new Array();
choices[9][0] = "carbon";
choices[9][1] = "hydrogen";
choices[9][2] = "uranium";

answers[9] = choices[9][2];

questions[10] = "11) Ionising radiation cannot be used to ... ";
choices[10] = new Array();
choices[10][0] = "treat cancer";
choices[10][1] = "sterilise surgical instruments";
choices[10][2] = "heat food";

answers[10] = choices[10][2];

questions[11] = "12) Energy is released from changes in the nucleus of ...";
choices[11] = new Array();
choices[11][0] = "fossil fuel";
choices[11][1] = "nuclear fuel";
choices[11][2] = "biomass fuel";

answers[11] = choices[11][1];

questions[12] = "13) Higher tier only - The amount of energy released during nuclear fission is more than the energy released in a chemical reaction.";
choices[12] = new Array();
choices[12][0] = "True";
choices[12][1] = "False";

answers[12] = choices[12][0];

questions[13] = "14) Power stations that use ... produce carbon dioxide.";
choices[13] = new Array();
choices[13][0] = "nuclear fuels";
choices[13][1] = "carbon fuels";
choices[13][2] = "renewable energy resources";

answers[13] = choices[13][1];

questions[14] = "15) Low level nuclear waste is ...";
choices[14] = new Array();
choices[14][0] = "mixed with concrete and stored in stainless steel containers";
choices[14][1] = "difficult to store safely as radiation damages containers";
choices[14][2] = "packed in drums and dumped in a lined landfill site";

answers[14] = choices[14][2];

questions[15] = "16) High level nuclear waste is ...";
choices[15] = new Array();
choices[15][0] = "mixed with concrete and stored in stainless steel containers";
choices[15][1] = "difficult to store safely as radiation damages containers";
choices[15][2] = "packed in drums and dumped in a lined landfill site";

answers[15] = choices[15][1];

questions[16] = "17) Sievert is the unit of ...";
choices[16] = new Array();
choices[16][0] = "radiation dose";
choices[16][1] = "half-life";
choices[16][2] = "penetration power of radiations";

answers[16] = choices[16][0];

questions[17] = "18) In a power station, most of the energy in fossil fuels is ...";
choices[17] = new Array();
choices[17][0] = "wasted to the environment in the process of generating electricity";
choices[17][1] = "is transmitted as electricity to consumers";
choices[17][2] = "is wasted in transmittion of electricity";

answers[17] = choices[17][0];


//response for getting 100%
response[0] = "Excellent, top marks!";
response[1] = "Revise Atomic structure";
response[2] = "Revise Generating electricity ";
response[3] = "Revise Generating electricity (Fossil fuels)";
response[4] = "Revise The three types of radiation";
response[5] = "Revise Radiation hazards";
response[6] = "Revise The three types of radiation";
response[7] = "Revise Half-life";
response[8] = "Revise The three types of radiation";
response[9] = "Revise The three types of radiation";
response[10] = "Revise Nuclear fission";
response[11] = "Revise Uses of ionising radiation";
response[12] = "Revise Nuclear Fission";
response[13] = "Revise Nuclear fission";
response[14] = "Revise Generating electricity (Fossil fuels)";
response[15] = "Revise Nuclear Fission";
response[16] = "Revise Nuclear Fission";
response[17] = "Revise Radiation Hazards";
response[18] = "Revise Efficiency";