General Science
The two elements that are frequently used for making transistors are

Iridium and Tungsten
Silicon and Germanium
Niobium and Columbium
Boron and Aluminium

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General Science
Among the various allotrope of carbon

Coke is the hardest, graphite is the softest
Diamond is the hardest, coke is the softest
Diamond is the hardest, graphite is the softest
Diamond is the hardest, lamp black is the softest

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