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Physics

Physics
Which resource is both renewable and inexpensive?

Minerals
Sunlight
Coal
Gold

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Physics
The force exerted by a magnet is an example of ________

Muscular force
Non-contact force
Electrostatic force
Contact force

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Physics
A potentiometer wire is 100 cm long and a constant potential difference is maintained across it. Two cells are connected in series first to support one another and then in opposite direction. The balance points are obtained at 50 cm and 10 cm from the positive end of the wire in the two cases. The ratio of the emf's is :

0.12777777777778
0.20902777777778
0.12638888888889
0.21111111111111

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Physics
Red is used as an emergency or danger signal as

It is a striking colour
It has very high energy
Its wavelength is the longest
It is scattered

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Physics
In mirrors the back surface is coated with a thin layer of :

Red oxide
Silver
Silver nitrate
Mercury

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Physics
The atmospheric layer reflecting radio waves is called

Stratosphere
Ozonosphere
Mesosphere
Ionosphere

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