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Physics

Physics
At the center of the sun, fusion converts hydrogen into

Carbon
Helium
Plutonium
Water

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Physics
Bubbles of air rise up through liquids due to

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

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Physics
Solar cells work on the principle of

Photoconductive effect
Photovoltaic effect
Photoelectric effect
Photosynthesis

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Physics
Which one of the following physical quantities has the same dimensions as that of Planck's constant?

Angular momentum
Linear momentum
Force
Potential energy

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Physics
The energy emitted by the Sun is due to

Nuclear fission
All of these
Nuclear fusion
Chemical reaction

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Physics
A nuclear reactor is said to have become 'critical' when

It stops due to malfunctioning
It is ready to produce controlled energy
It is shut down to avoid explosion
It starts emitting dangerous radioactive radiations

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