Physics
Bubbles of air rise up through liquids due to

Up thrust and surface tension
Surface tension and adherence
Viscosity and buoyancy
Air current over the liquid and buoyancy

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Physics
Circuit breaker usually operate under

Steady state of short-circuit current
Sub-transient state of short-circuit current
Transient state of short-circuit current
After D. C. component has ceased

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Physics
For an ideal gas, which one of the following statements does not hold true?

The speed of all gas molecules is same
The kinetic energies of all gas molecules are not same
The potential energy of the gas molecules is zero
There is no interactive force between the molecules.

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