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

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

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Physics
Specific gravity is defined as the ratio of

Density of the substance to the density of water
Density of water at 4°C to the density of the substance
Density of the substance to the density of water at 0°C
Density of the substance to the density of water at 4°C

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Physics
Purpose of an optical filter is to

Refract light of different colours
Dispense light into component colours
Reflect lights of different colours
Transmit or absorb light of different colours

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