Physics
A NOT gate can be implemented by:

A single transistor
A single diode
Two diodes
A single resistor

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Physics
It is easier for a man to swim in sea water, than in river water because

The density of sea water is more than the density of river water
The sea is wider than the river
The density of sea water is lesser than the density of river water
The sea is-deeper than the river

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

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

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