Physics
A tank filled partially with a liquid is subjected to a uniform horizontal acceleration. Which of the following is true for the surface of liquid in the tank?

The surface of the liquid remains horizontal
None
The liquid surface falls down on the direction of motion and rises up on the back side of the tank
The liquid surface falls down only at the center of the tank

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Physics
Purpose of an optical filter is to

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

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Physics
What is a compound microscope?

A microscope whose lenses are concave.
A microscope that has two sets of lenses : an occular lens and an eyepiece.
A microscope whose lenses are convex.
A microscope that has one lens.

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