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Physics

Physics
Speed of sound is the greatest in :

Air
Glycerine
Glass
Water

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Physics
Two metallic wires made from copper have same length but the radius of wire 1 is half of that of wire 2. The resistance of wire 1 is R. If both the wires are joined together in series, the total resistance becomes

R/2
3R/4
5R/4
2R

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Physics
The energy of a photon, whose momentum is 10 MeV/c, where c is the speed of light, is given by

100 MeV
0.1 MeV
1 MeV
10 MeV

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Physics
Which of the metals has the maximum thermal conductivity?

Copper
Silver
Aluminium
Iron

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Physics
Optical fibre works on which of the following principle of light?

Diffraction
Total internal reflection
Refraction
Reflection

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Physics
When a bar magnet is cut into two equal halves, the pole strength of each piece –

Becomes double
Becomes half
Remains the same
Becomes zero

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