Assertion and reason: semiconductors

Exercise and reference answers

Questions

1. Reason

   They are the basic materials of diodes, transistors and integrated circuits.

   Verdict

   Both are true; the reason explains the assertion.

   Assertion

   Semiconductors underpin modern electronics.

2. Reason

   Thermal excitation frees more electrons and creates more holes.

   Verdict

   Both are true; the reason explains the assertion.

   Assertion

   Heating a pure semiconductor increases its conduction.

3. Reason

   Gallium arsenide is a compound semiconductor.

   Verdict

   The assertion is false and the reason is true.

   Assertion

   All semiconductors are compounds.

Explanation