Physics
On which of the following techniques photostate machine works ?

Electrostatic Image—Making
Electromagnetic Image— Making
Magnetic Image—Making
Thermal Image—Making

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Physics
A hydrogen balloon floats up because of

Weight of the balloon is less than the weight of air displaced by it.
The pressure inside the balloon is more than the pressure outside it
Air pressure decreases with decrease in height
Air pressure decreases with decrease in weight

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