Physics
When a vibrating tuning fork is placed on a table, a loud sound is heard. This is due to :

Damped vibrations
Reflection
Forced vibrations
Refraction

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Physics
Which of the following is not a property of heavy water ?

Boiling point of heavy water is lower than that or ordinary water
It produces corrosion
Density of heavy water is higher than that of ordinary water
Freezing point of heavy water is higher than that of ordinary water

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Physics
What is refractive index ?

It is defined as the product of speed of light in medium and in vacuum.
None of above
It is defined as the ratio of speed of light in the medium to the speed of light in vacuum.
It is defined as the ratio of speed of light in vacuum to the speed of light in the medium.

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