Physics
Why does water tank appear shallower when viewed from the top?

Due to diffraction
Due to refraction
Due to reflection
Due to total internal reflection

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Physics
The earth is a

Good reflector of heat
Bad absorber and bad radiator of heat
Non-absorber of heat
Good absorber and good radiator of heat

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Physics
Isotopes of an element contain

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

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