Physics
In a particular system, the units of length, mass and time are chosen to be 10 cm, 10 g and 0.1 s respectively. The unit of force in this system will be equivalent to

1 N
0.1 N
100 N
10 N

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Physics
Superconductors are those elements

Which conduct electricity only at super-high temperatures
Whose conductivity is intermediate between metals and insulators
Which turn into insulators at very low temperatures
Whose resistance falls almost to zero at very low temperatures

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