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Physics

Physics
When water freezes its density

Becomes Zero
Increases
Remains constant
Decreases

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Physics
A bird sitting on a high tension electric wire does not get electrocuted because

It has high resistance
The body is earthed
Its feet are good insulators
It does not form a closed path for the flow of current

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Physics
Radioactive elements can be traced out in living cell through a technique called

Chromatography
All listed here
Centrifugation
Auto radiography

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Physics
Which of the following criterion is used for any metal to be used as a cooking material ?

Less thermal conductivity
More thermal conductivity
Less electrical conductivity
More specific heat

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Physics
A solid needle placed horizontally on the surface of the water floats due to

Viscosity of water
Water pressure
Capillary action
Surface tension of water

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Physics
Lens is made up of

Flint glass
Ordinary glass
Pyrex glass
Cobalt glass

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