On increasing temperature, the resistance of semiconductors:

The Correct Answer is Option 2 i.e decreases.

CONCEPT:

• Conductor: The material that allows the electric current to flow through them is called the conductor.
  • The resistance of a conductor increases by increasing the temperature.
• Semiconductor: It is a substance or material that is neither a good conductor of electricity nor a good insulator, but has properties of electrical conductivity somewhere between the two.
  • The two most frequently used semiconductors are (i) germanium (Ge) and (ii) silicon (Si).

​EXPLANATION:

• In a semiconductor, as the temperature increases, the electrons get excited and jump from the valance band into the conduction band and thereby increases conductance resulting in the decrease of resistance. 
• Hence on increasing temperature, the resistance of semiconductors decreases. So option 2 is correct.