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Physics

Physics
The density of water is 1 g/cc. This is strictly valid at

25°C
100°C
0°C
4°C

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Physics
Rainbow is produced when sunlight fall on drops of rain. Which of the following physical phenomena are responsible for this? I.Diffusion II.Refraction III.Internal reflection

II and III
I, II and III
I and III
I and II

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Physics
The instrument used to see the distant objects on the Earth is

Terrestrial telescope
Compound microscope
Simple microscope
Astronomical telescope

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

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

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Physics
The threshold frequency is the frequency below which :

Photo current increases with voltage
Photo electric emission is not possible
Photo current is constant
Photo current decreases with voltage

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Physics
The reason for a swimming pool to appear less deep than the actual depth is

Interference
Light scattering
Reflection
Refraction

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