Physics
The mass defect is the result of what action occurring?

Protons and electrons being attracted to each other
Energy being converted into moles of atoms when neutrons break apart protons
Mass being converted to energy when protons and neutrons break apart in a nucleus
Mass being converted to energy when protons and neutrons bind together in a nucleus

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Physics
A drop of liquid assumes spherical shape because:

Inter molecular forces are weak in liquids
Intermolecular forces are strong in liquids
A sphere has the least surface area for a given volume
A sphere has the largest surface area for a given volume

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