22An ECG machine records the:ALung capacityBElectrical activity of the heartCBlood sugarDBrain wavesView AnswerDiscussWorkspaceReportSaveEasy
23A screw gauge measures:AVery small lengths like wire thicknessBLarge distancesCMassDVolume of liquidsView AnswerDiscussWorkspaceReportSaveEasy
24A voltmeter measures:APotential differenceBCurrentCResistanceDPowerView AnswerDiscussWorkspaceReportSaveEasy
25A periscope is used in submarines to:ASee objects above the waterBMeasure depthCMeasure speedDDetect soundView AnswerDiscussWorkspaceReportSaveEasy