Physics
At what temperature do the Fahrenheit and Celsius scales give the same reading?

0 degreees
-40 degreees
212 degrees
32 degreees

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Physics
Purpose of an optical filter is to

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

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Physics
A drop of liquid assumes spherical shape because:

Inter molecular forces are weak in liquids
A sphere has the least surface area for a given volume
A sphere has the largest surface area for a given volume
Intermolecular forces are strong in liquids

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