Physics
In superconductors, the energy gap is due to

Electron-photon intercation
Phonon-phonon interaction
Electron-electron interaction
Electron-phonon interaction

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Physics
When a pail of water is swung in a vertical circle, the water does not fall out at the top of the loop when the speed is

Above a certain minimum value irrespective of amount of water in the pail
Above a certain minimum value depending on amount of water in the pail
Below a certain minimum value irrespective of amount of water in the pail
Below a certain minimum value depending on amount of water in the pail

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Physics
The sky appears blue because

The atmosphere scatters blue colour more than the others
In white light, the blue component dominates
All colours interfere to produce blue
It is actually blue

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