Physics
An oil drop spreads over water because

Oil is more viscous
Oil does not mix with water
water has a higher surface tension
Oil is lighter than water

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Physics
Super conductors are substances that

Offer high resistance to the flow of electric current
Conduct electricity at low temperature
Conduct electricity at high temperature
Offer minimum resistance to flow of electric current

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Physics
In the gamma decay of a nucleus

The mass number of the nucleus changes whereas its atomic number does not change
Neither the mass number nor the atomic number of the nucleus changes
Both the mass number and the atomic number of the nucleus change
The mass number of the nucleus does not change whereas its atomic number changes

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