The effect of increase in temperature on the number of electrons in conduction band (ne) and resistance of a semiconductor will be as:Both ne and resistance decreaseBoth ne and resistance increasene increases, resistance decreasesne decreases, resistance increases

The effect of an increase in temperature on the number of electrons in the conduction band (ne) and the resistance of a semiconductor is: ne increases, resistance decreases.

Here's why:

1. Semiconductors are materials that have properties of both conductors and insulators. They conduct electricity under certain conditions and insulate under others.

2. The conduction band in semiconductors is the energy band that is partially filled with electrons. These electrons are free to move and hence contribute to electrical conduction.

3. As the temperature increases, the energy of the semiconductor also increases. This added energy can excite electrons from the valence band (where electrons are not free to move) to the conduction band, increasing the number of free electrons (ne).

4. The resistance of a material is inversely proportional to the number of free electrons. Therefore, as ne increases, the resistance decreases.

So, the correct answer is: ne increases, resistance decreases.