As the temperature increases, the electrical resistance:

CONCEPT:

Electrical resistance is defined as the force which counteracts the flow of the current and it is the ratio of the voltage applied to the current of the given material.

R = \(\frac {V}{I}\)

Here R is the resistance, V is the applied voltage and I is the current flows in the circuit.

The conductor is the material in which the valance band and conduction band overlap each other and semiconductors are that material in which the valance band and conduction band is having some gap but this gap is less than compared to the insulators.

EXPLANATION:

In a conductor when temperature increases the flow of the electron inside the conductor will also increase which means that the collision between the electrons increases. Due to this collision, the resistivity inside the conductor will increase.

∴ Resistance increases. Whereas in semiconductors there is the presence of the band gap which helps for less collision and decreases its resistance.

Hence, option 4) is the correct answer.