Physics
The locomotion of insects to the source of light is called :

Thermotactic
Phototropic
Hydrotropic
Phototactic

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Physics
In the gamma decay of a nucleus

The mass number of the nucleus does not change whereas its atomic number changes
Both the mass number and the atomic number of the nucleus change
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

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