16LED lamps are preferred over incandescent lamps because they:AContain mercuryBProduce more heatCUse much less energy and last longerDAre dimmerView AnswerDiscussWorkspaceReportSaveEasy
17Dielectric heating is used for:AElectroplatingBHeating non-conducting materials such as wood and plasticsCLightingDMelting steelView AnswerDiscussWorkspaceReportSaveEasy
18Which lamp has the highest luminous efficacy among these?ACandleBHalogenCLEDDIncandescentView AnswerDiscussWorkspaceReportSaveEasy