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Physics

Physics
Red light has a wavelength of 70 A°. In "nm" it is

0.07 nm
7 nm
700 nm
70 nm

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Physics
Safety fuse wire used in domestic electrical appliances is made of metal of low

Melting point
Resistance
Conductance
Specific gravity

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Physics
In order to make an electromagnet you need a

Iron nail
Dry cell batteries
Thin coated copper wire
All of these

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Physics
Copper wires are generally used for electrical power transmission instead of iron wire because :

Copper is cheaper than iron
Copper is a better conductor of electricity than iron
Copper is lighter than iron
Copper can take higher power than iron

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Physics
Which is a common first indicator of an approaching thunderstorm?

Heavy wind
A buildup of dark clouds
Lightning
Too hot

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Physics
At what temperature do the Fahrenheit and Celsius scales give the same reading?

32 degreees
0 degreees
-40 degreees
212 degrees

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