[{"id":40519,"question":"A conductor of electric current is:","choices":[{"text":"Wood","value":"A"},{"text":"Rubber","value":"B"},{"text":"Plastic","value":"C"},{"text":"Copper","value":"D"},{"value":"E"}],"correctAnswer":4},{"id":40518,"question":"Which wire has lowest resistance?","choices":[{"text":"Thick wire","value":"A"},{"text":"Thin wire","value":"B"},{"text":"Very thin wire","value":"C"},{"text":"All","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":40517,"question":"In mathematical form of Ohm's law, \"R\" is:","choices":[{"text":"Resistance","value":"A"},{"text":"Specific resistance","value":"B"},{"text":"Resistor","value":"C"},{"text":"Resistivity","value":"D"},{"value":"E"}],"correctAnswer":1},{"id":40516,"question":"Electric current in conductors is due to the flow of:","choices":[{"text":"Positive ions","value":"A"},{"text":"Negative ions","value":"B"},{"text":"Positive charge","value":"C"},{"text":"Free electrons","value":"D"},{"value":"E"}],"correctAnswer":4},{"id":40515,"question":"Which instrument measures the potential difference:","choices":[{"text":"Voltmeter","value":"A"},{"text":"Barometer","value":"B"},{"text":"Galvanometer","value":"C"},{"text":"Ammeter","value":"D"},{"value":"E"}],"correctAnswer":1},{"id":40514,"question":"Mathematical formula of electromotive force (e.m.f) is:","choices":[{"text":"E = W/Q","value":"A"},{"text":"E = Q/W","value":"B"},{"text":"E = WQ","value":"C"},{"text":"E = W2Q","value":"D"},{"value":"E"}],"correctAnswer":1},{"id":40513,"question":"The S.I unit of potential difference is:","choices":[{"text":"Ampere","value":"A"},{"text":"Coulomb","value":"B"},{"text":"Volt","value":"C"},{"text":"Watt","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":40512,"question":"The S.I unit of electric current is:","choices":[{"text":"Volt","value":"A"},{"text":"Ampere","value":"B"},{"text":"Coulomb","value":"C"},{"text":"Watt","value":"D"},{"value":"E"}],"correctAnswer":2}]