Physics
Bubbles of air rise up through liquids due to

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

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Physics
Mica is used in electrical appliances such as electric iron because mica is

a good conductor of heat but a bad conductor of electricity
a bad conductor of heat but a good conductor of electricity
a good conductor of heat as well as electricity
a bad conductor of heat as well as electricity

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Physics
The sensation of weightlessness in a spacecraft in an orbit is due to the

Absence of gravity outside
Fact that spacecraft in the orbit has no energy
Presence of gravity outside but not inside the spacecraft
Acceleration in the orbit which is equal to the acceleration due to gravity outside

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