A piece of copper and another piece of Germanium are cooled from 30Â°C to 80 K. The resistance of

Electronics and Communication Engineering (ECE) : Materials and Components - Quiz(MCQ)

both increases

both decreases

copper increases and germanium decreases

copper decreases and germanium increases

Correct Answer : Option (D) : copper decreases and germanium increases

Explanation : As temperature is decreased, resistance of conductors decreases and resistance of semiconductors increases.

Recently Updated in Materials and Components Questions

Magnetic hysteresis phenomenon is explained by

domain rotation

motion of domain walls

motion of domain walls and domain rotation

None of the above

Correct Answer : motion of domain walls and domain rotation

A circular sphere mile is the area of cross-section of a wire

having a radius equal to 1 miles

having a circumference equal to 1 miles

having a circumference equal to 0 miles

having a diameter equal to 1 miles

Correct Answer : having a diameter equal to 1 miles

For small size high frequency coils, the most common core material is

steel

ferrite

air

powdered iron

Correct Answer : air