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Physics

Physics
The focal length of a concave mirror with a radius of curvature of 20.0 cm is :

5 cm
10 cm
15 cm
20 cm

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Physics
Name the process of production of energy in the Sun

Radioactivity
Ionization
Nuclear fusion
Nuclear fission

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Physics
What apparatus is used to locate a submerged object?

Sonar
Radar
Quasar
Pulsar

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Physics
Forged documents are detected by

Gamma rays
Beta rays
Infra-red rays
Ultraviolet rays

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Physics
Super cooling stands for cooling of a liquid :

Above melting point
At freezing point
At melting point
Below freezing point

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Physics
The mercury and sodium street lamps light up because of :

Electron emission
Atomic emission
Electron absorption
Atomic absorption

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