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Physics

Physics
Which of the following cannot be used for making lenses?

Plastic
Water
Soil
Glass

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Physics
In the atmosphere ultraviolet rays are absorbed by

Ozone
Helium
Nitrogen
Oxygen

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Physics
A parallel-plate capacitor,with air in between the plates, has capacitance C. Now the space between the two plates of the capacitor is filled with a dielectric of dielectric constant 7. Then the value of the capacitance will become

14C
C
C/7
7C

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Physics
Formation of shadows can be explained by

Total internal reflection
Refraction
Reflection
Rectilinear propagation of light

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Physics
The resistance of the human body (dry condition) is of the order of

102 Ohm
None of these
101 Ohm
103 Ohm

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Physics
According to the quantum theory of light, the energy of light is carried in discrete units are called

Photons
Protons
Electrons
Photoelectrons

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