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Physics
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1) Name two materials whose resistance doesn't change with the rise or fall in temperature. 2) Name two materials whose temperature increases with the rise in temperature. 3) Name two materials whose temperature decreases with the fall in the temperature.‚Äč

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ans-1 The metalloids such as Silicon, Germanium (and others) are semiconductors, in these elements, electrical conduction occurs due to overlapping conduction bands of electrons.

ans-2 The resistivity of metals (like copper, aluminum) increases with increase in temperature. Resistance of semiconductors( like silicon, germanium) decreases with increase in temperature.

ans-3 Resistivity of semiconductors decreases with rise in temperature. So, the three substances whose resistivity decreases with the rise in temperature are Graphite,Silicon and Germanium.

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