Physics
A soap bubble shows colours when illuminated with white light. This is due to

Diffraction
Interference
Polarisation
Reflection

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Physics
A capillary tube is partially dipped vertically in a vessel containing water. Due to capillarity water rises in the tube. The height of water rise in the tube can be increased by

Decreasing the radius of the capillary tube
Increasing the radius of the capillary tube
Increasing the height of water in the vessel
None of these

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Physics
Purpose of an optical filter is to

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

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