Physics
Hydroscope is an instrument that shows changes in:

Density of liquid
None of these
Sound under water
Atmospheric humidity

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Physics
To prevent damage from lightning, lightning conductors are used on tall structures. The lightning conductor

Should be in the form of a vertical rod
Can be of any shape
Should be made of a good conductor like copper with sharp-pointed edges
Should be made of a good conductor but can be of any shape

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Physics
Isotopes of an element contain

equal number of nucleons
equal number of protons and electrons
the same number of neutrons but different number of protons
the same number of protons but different number of neutrons

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