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

questions[0] = "1) Conduction happens in ...";
choices[0] = new Array();
choices[0][0] = "Liquids";
choices[0][1] = "Solids";
choices[0][2] = "Gases";

answers[0] = choices[0][1];

questions[1] = "2) Convection happens in ...";
choices[1] = new Array();
choices[1][0] = "liquids and gases";
choices[1][1] = "solids and gases";
choices[1][2] = "solids and liquids";

answers[1] = choices[1][0];

questions[2] = "3) Heat travels through a double glazed window that has a vacuum between the two panes of glass by ...";
choices[2] = new Array();
choices[2][0] = "conduction";
choices[2][1] = "convection";
choices[2][2] = "radiation";

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

questions[3] = "4) The wasted heat energy from a lamp is often transferred to the surroundings.";
choices[3] = new Array();
choices[3][0] = "True";
choices[3][1] = "False";

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

questions[4] = "5) Higher tier only: Metals are good conductors of heat energy because the energy is transferred by ...";
choices[4] = new Array();
choices[4][0] = "atomic vibrations only";
choices[4][1] = "free electrons only";
choices[4][2] = "atomic vibrations and free electrons";

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

questions[5] = "6) In an experiment to find the effect of colour on the temperature of water in a can. The independent variable is the ...";
choices[5] = new Array();
choices[5][0] = "temperature";
choices[5][1] = "colour of the can";
choices[5][2] = "volume of water";

answers[5] = choices[5][1];

questions[6] = "7) In the above experiment, the control variable is the ...";
choices[6] = new Array();
choices[6][0] = "temperature";
choices[6][1] = "colour of the can";
choices[6][2] = "volume of water";

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

questions[7] = "8) Wool is a good heat insulator because it ...";
choices[7] = new Array();
choices[7][0] = "is warm";
choices[7][1] = "traps air";
choices[7][2] = "is soft";

answers[7] = choices[7][1];

questions[8] = "9) The writing 60 W on a lamp means the lamp ...";
choices[8] = new Array();
choices[8][0] = "transfers 60 joules per minute";
choices[8][1] = "gains 60 Joules per second";
choices[8][2] = "transfers 60 Joules per second";

answers[8] = choices[8][2];

questions[9] = "10) Efficiency is ...";
choices[9] = new Array();
choices[9][0] = "wasteful energy output per total energy input";
choices[9][1] = "useful energy input per total energy input";
choices[9][2] = "useful energy output per total energy input";

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

questions[10] = "11) The main energies wasted in a car engine are ...";
choices[10] = new Array();
choices[10][0] = "sound and kinetic";
choices[10][1] = "heat and kinetic";
choices[10][2] = "heat and sound";

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

questions[11] = "12) 100 J of electrical energy was transferred by a torch into 5 J light and 95 J heat. The efficiency of the torch is ...";
choices[11] = new Array();
choices[11][0] = "95 %";
choices[11][1] = "100 %";
choices[11][2] = "5 %";

answers[11] = choices[11][2];


questions[12] = "13) A house cools down because heat is transferred through the walls, the ceiling and the floor by ...";
choices[12] = new Array();
choices[12][0] = "conduction";
choices[12][1] = "convection";
choices[12][2] = "radiation";

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

questions[13] = "14) The useful form of energy from a drill is ...";
choices[13] = new Array();
choices[13][0] = "sound";
choices[13][1] = "heat";
choices[13][2] = "kinetic";

answers[13] = choices[13][2];

questions[14] = "15) Different materials of similar shape and dimentions and under similar conditions, transfer heat at the same rate.";
choices[14] = new Array();
choices[14][0] = "True";
choices[14][1] = "False";

answers[14] = choices[14][1];

//response for getting 100%
response[0] = "Excellent, top marks!";
response[1] = "Revise thermal conduction";
response[2] = "Revise thermal convection";
response[3] = "Revise thermal radiation";
response[4] = "Revise energy flow diagrams";
response[5] = "Revise thermal conduction";
response[6] = "Revise How Science Works keywords";
response[7] = "Revise How Science Works keywords";
response[8] = "Revise efficient use of energy";
response[9] = "Revise power";
response[10] = "Revise efficiency";
response[11] = "Revise energy flow diagrams";
response[12] = "Revise efficiency";
response[13] = "Revise energy flow diagrams";
response[14] = "Revise energy flow diagrams";
response[15] = "Revise thermal conduction & efficient use of energy";
response[16] = "Revise energy flow diagrams";
response[17] = "Revise transfer of heat";