Question

wlWhich is not true
1. resistence of metals increases with increasing temperature
2. resistence of semi-conductors decreases with rise of temperature.
3. resistence of an electrolyte decreases with rise of temperature
4. none of the above​

Answer 1

resistance is directly proportional to length and inversely proportional to area in case of metals

for metals on increasing temperature length increases and so does the resistance

so 1 is right

for semiconductors its just the opposite

so it makes 2 also correct

now for an electrolyte as temperature increases ionic mobility increases so resistance gradually decreases

hence 3 is also correct

therefore answer is 4

thank you

#ckc