german silver is alloy of copper, nickel and zinc so the answer is none of these
convection is heat transfer in liquids, so the answer to the first one should be radiation
Sonar uses ultrasound
rainfall is measured by none of these, bcuz its measured by rain guage
twinkling of stars is due to interference, just checked it on wikipedia
escape velocity is 7 miles/sec
these are the ones that I am very sure about.
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