General Science
In an atomic nucleus, neutrons and protons are held together by:

Gravitational forces
Exchange forces
Magnetic forces
Coulombic forces

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General Science
Among the various allotrope of carbon

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

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