Read the following statements carefully :
Y : The resistivity of a semiconductor decreases with increase of temperature.
Z : In a conducing solid, the rate of collisions between free electrons and ions increase with increase of temperature.
Select the correct statement (s) from the followin :

Options

A. Y is true but Z is false
B. Y is false but Z is true.
C. Both Y and Z are true
D. Both Y and Z are false

Answer

C

Explanation

(c ) The conductivity of a semiconductor increases with increases in temperature i.e. the resistivity decreases with increases in temperature.
In a conducting solid, the collisions become more frequent with increase of temperature.