Physics
Which of the following is arranged in order of decreasing conductivity?

Aluminium, Silver, Copper, Steel
Copper, Silver, Aluminium, Steel
Copper, Aluminium, Steel, Silver
Silver, Copper, Aluminium, Steel

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Physics
A drop of liquid assumes spherical shape because:

A sphere has the least surface area for a given volume
Intermolecular forces are strong in liquids
A sphere has the largest surface area for a given volume
Inter molecular forces are weak in liquids

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Physics
To resolve an object in an electron microscope,

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

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