Physics
The group of solar cells joined together in a definite pattern is called a

Solar heater
Solar cell panel
Battery
Solar cooker

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Physics
To resolve an object in an electron microscope,

The wavelength of the electrons must be close to the diameter of the object
None of these
Both A & B
The wavelength of the electrons must be greater than the diameter of the object.

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Physics
Hydro-electric power is a:

A mixture of renewable and non-renewable natural resource
non-renewable natural resource
Renewable natural resource
Neither renewable nor non renewable resource

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