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Physics

Physics
Period of oscillation of 3 cm microwaves in seconds is

0.001
0.01
1 × 10–10
1 × 1010

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Physics
Wollen clothes keep the body warm because

Wool absorbs radiant heat from outer objects
Wool is a bad conductor
Wool increases the temperature of the body
Wool rejects heat from the outer objects

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Physics
Lux is the SI unit of

luminous intensity
luminous efficiency
intensity of illumination
luminous flux

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Physics
Which of the following has got more heat capacity ?

Benzene
Iron piece
Water
Gold piece

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Physics
The height of a geo-stationary satellite from the Earth's surface is approximately :

36,000 km
30,000 km
42,000 km
None of these

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Physics
In superconductors, the energy gap is due to

Electron-electron interaction
Electron-photon intercation
Electron-phonon interaction
Phonon-phonon interaction

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