[{"id":235538,"question":"in binary system. 37 is written as.","choices":[{"text":"101101","value":"A"},{"text":"100101","value":"B"},{"text":"110011","value":"C"},{"text":"101011","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":235537,"question":"Electric signal is converted into digital signal by.","choices":[{"text":"Key board","value":"A"},{"text":"Monitor","value":"B"},{"text":"Scanner","value":"C"},{"text":"Modem","value":"D"},{"value":"E"}],"correctAnswer":4},{"id":235536,"question":"Diodes are used to.","choices":[{"text":"Convert A.C. into D.C","value":"A"},{"text":"Convert D.C into A.C","value":"B"},{"text":"Store Charge","value":"C"},{"text":"Change voltage","value":"D"},{"value":"E"}],"correctAnswer":1},{"id":235535,"question":"In P-type semi -conductior, most of the current is due to.","choices":[{"text":"Free electron","value":"A"},{"text":"Holes","value":"B"},{"text":"Positive ions","value":"C"},{"text":"Heat","value":"D"},{"value":"E"}],"correctAnswer":1},{"id":39129,"question":"Digital singles are represented by;","choices":[{"text":"zero and 1","value":"A"},{"text":"zero and 10","value":"B"},{"text":"1 and 2","value":"C"},{"text":"o and 9","value":"D"},{"value":"E"}],"correctAnswer":1},{"id":39128,"question":"Which of the following is a brain of computer?","choices":[{"text":"Central processing unit&nbsp;","value":"A"},{"text":"Mouse&nbsp;","value":"B"},{"text":"Monitor&nbsp;","value":"C"},{"text":"Hard disc","value":"D"},{"value":"E"}],"correctAnswer":1},{"id":39127,"question":"Which of the following is an input device:","choices":[{"text":"key board&nbsp;","value":"A"},{"text":"printer","value":"B"},{"text":"monitor&nbsp;","value":"C"},{"text":"CPU&nbsp;","value":"D"},{"value":"E"}],"correctAnswer":1},{"id":39126,"question":"The number of hovering satellites which can send transmissions to all over the world:","choices":[{"text":"one&nbsp;","value":"A"},{"text":"Two&nbsp;","value":"B"},{"text":"Three&nbsp;","value":"C"},{"text":"Four&nbsp;","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":39125,"question":"Hovering satellite completes its rotation in 24 hours at the height of:","choices":[{"text":"360 km&nbsp;","value":"A"},{"text":"3600 km&nbsp;","value":"B"},{"text":"36000 km&nbsp;","value":"C"},{"text":"360000 km&nbsp;","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":39124,"question":"How many electrons Guns are used in colour T.V?","choices":[{"text":"One&nbsp;","value":"A"},{"text":"Two&nbsp;","value":"B"},{"text":"Three&nbsp;","value":"C"},{"text":"Four&nbsp;","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":39123,"question":"The frequency of the carrier waver used of radio transmission:","choices":[{"text":"30 KHZ","value":"A"},{"text":"40 KHZ","value":"B"},{"text":"50 KHZ","value":"C"},{"text":"60 KHZ","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":39122,"question":"The speed of radio wave is:","choices":[{"text":"Light","value":"A"},{"text":"Air&nbsp;","value":"B"},{"text":"Sound","value":"C"},{"text":"Rocket&nbsp;","value":"D"},{"value":"E"}],"correctAnswer":1},{"id":39121,"question":"Which of the &nbsp;following are electromagnetic waves:","choices":[{"text":"sound&nbsp;","value":"A"},{"text":"water waves&nbsp;","value":"B"},{"text":"Ultrasound&nbsp;","value":"C"},{"text":"light","value":"D"},{"value":"E"}],"correctAnswer":4},{"id":39120,"question":"Which of the following is used as rectifier;","choices":[{"text":"semi - conductor diode","value":"A"},{"text":"resistors","value":"B"},{"text":"capacitors","value":"C"},{"text":"Germanium","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":39119,"question":"Which element is used &nbsp;to make LED?","choices":[{"text":"Aluminum&nbsp;","value":"A"},{"text":"Calcium&nbsp;","value":"B"},{"text":"sodium&nbsp;","value":"C"},{"text":"Arsenic&nbsp;","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":39118,"question":"The elements used to increase the number of free electrons in the semi - conductor belong to:","choices":[{"text":"2<sup>nd</sup> group &nbsp;","value":"A"},{"text":"3<sup>rd</sup> group&nbsp;","value":"B"},{"text":"4<sup>th</sup> group","value":"C"},{"text":"5<sup>th</sup> group","value":"D"},{"value":"E"}],"correctAnswer":1},{"id":39117,"question":"The examples of semi - conductors:","choices":[{"text":"sodium and potassium","value":"A"},{"text":"calcium and potassium","value":"B"},{"text":"Germanium and silicon","value":"C"},{"text":"carbon and nitrogen","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":39116,"question":"The substances through which current con not pass are called:","choices":[{"text":"Semi - conductors&nbsp;","value":"A"},{"text":"Insulators&nbsp;","value":"B"},{"text":"conductors&nbsp;","value":"C"},{"text":"non - metal&nbsp;","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":39115,"question":"The substances through which current can pass easily are called:","choices":[{"text":"conductors&nbsp;","value":"A"},{"text":"insulators&nbsp;","value":"B"},{"text":"Semi - conductors&nbsp;","value":"C"},{"text":"Non - Electrolytes&nbsp;","value":"D"},{"value":"E"}],"correctAnswer":1}]