Physics
A piece of wood is held under water. The upthrust on it will be:

Zero
Equal to the weight of the wood
Less than weight of the wood
More than weight of the wood

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Physics
Which one of the following is the correct sequence of passage of light in a compound microscope?

Eyepiece -Objective lens -Body tube -Mirror
Condenser -Objective lens -Body tube -Eyepiece
Condenser -Objective lens -Eye -piece -Body tube
Objective lens -Condenser -Body tube -Eye piece

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Physics
Light houses are places with powerful lights to :

Guide and warn the ships coming from different directions in the ocean
Guide and resolve traffic jams in crowded metro-cities during nights
Guide and help large crowds at religious gathering during nights
Indicate to the incoming warships, the location of a harbour during night

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