// this file is copyright - Easyphysics  
// it adds the quiz questions and answers 
// load  arrays with a set of questions and  answers 
banksize=15;
questions=new Array();
 questions[1] ='Temperature is measured in ...~kilogram~degree celcius~watt~joule~B';
 questions[2] ='Heat is measured in ...~kilogram~degree celcius~joule~watt~C';
 questions[3] ='The amount of energy needed to change the temperature of 1 kg of a substance by 1 degree celcius is ...~specific latent heat~specific heat capacity~kinetic energy~heat energy~B';
 questions[4] ='When a substance changes state, ...~it becomes hot~its mass changes~its temperature stays the same~its temperature decreases~C';
 questions[5] ='Trapped air in loft insulation reduces energy transfer by ...~conduction~convection~radiation~convection and radiation~B';
 questions[6] ='This is NOT an advantages of using optical fibres instead of copper wires for communication over long distances.~Optical  fibres do not corrode~There is much less signal loss in optical fibres~There is much less signal loss in copper wires~There is no heating effect in optical fibres~C';
 questions[7] ='The efficiency of a  bulb that transforms 100 J of electrical energy into 6 J of light and 94 J of heat is ...~100 %~6 %~94 %~88 %~B';
 questions[8] ='This type of radiation is used for cooking and remote controls.~Light~Microwave~Ultraviolet~Infrared~D';
 questions[9] ='This type of radiation is used for cooking and for communication.~Light~X-rays~Microwave~Infrared~C';
 questions[10] ='Higher tier only: The specific latent heat of evaporation when 450 kJ of energy is needed to evaporate 150 g of water is ...~3000 J/kg~67500 J/kg~3 J/kg~0.33 J/kg~A';
 questions[11] ='Sunscreen can be used to protect us from this type of radiation that causes skin cancer.~Infrared~Microwave~Ultraviolet~Gamma~C'; 
 questions[12] ='Ali can stay in the sun for 20 minutes without burning. The longest time he can safely stay in the sun when using sunscreen with a sun protection factor number SPF 15 is ...~5 hours~5 minutes~15 minutes~15 hours~A';
 questions[13] ='The size of an earthquake is detected and measured by ...~an ammeter~a voltmeter~a seismometer~a geiger counter~C';
 questions[14] ='The seismic wave that travels faster and causes less damage is ...~Primary wave~Secondary wave~Gamma wave~X - rays~A';
 questions[15] ='Higher tier only: The frequency of a sound wave that has a wavelength of 0.3 m and travels with a speed of 330 m/s is ...~1100 Hz~1100 m~99 m~99 Hz~A';