16The unit of electric current is the:AVoltBOhmCAmpereDCoulombView AnswerDiscussWorkspaceReportSaveEasy
17If the distance between two masses is doubled, the gravitational force becomes:AOne-fourthBHalfCDoubleDFour timesView AnswerDiscussWorkspaceReportSaveMedium
18A body is thrown upwards. At its highest point, its:AVelocity is zero but acceleration is gBVelocity and acceleration are both zeroCAcceleration is zeroDVelocity is maximumView AnswerDiscussWorkspaceReportSaveMedium
19Sounds with frequencies above 20,000 Hz are called:AUltrasonicBAudibleCInfrasonicDSupersonicView AnswerDiscussWorkspaceReportSaveEasy
20Short-sightedness (myopia) is corrected using a:ABifocal lens onlyBConvex lensCConcave lensDCylindrical lensView AnswerDiscussWorkspaceReportSaveEasy