CHEMISTRY Questions & Answer

CHEMISTRY
MIDDLE SCHOOL
CHEMISTRY
MIDDLE SCHOOL
1Which is a dopant for a p-type semiconductor? arsenic
indium
phosphorus
antimony

2Which statement is true for both types of transistors?

Current flows from the collector to the emitter.
Current flows from the base to the emitter.
The base is between the collector and the emitter.
The base is a p-type semiconductor.

3 Which explains whether boron or arsenic is the dopant most likely used in the semiconductor layer marked with +?

This layer is the controller of an NPN transistor, so it could include boron.
This layer is the emitter of an NPN transistor, so it could include arsenic.
This layer is the controller of a PNP transistor, so it could include arsenic.
This layer is the emitter of a PNP transistor, so it could include boron.

4 What can a transistor do in order to fulfill its function in a circuit? Check all that apply.

control which layer is the emitter
control its own semiconductance
change the dopants in the transistor
act like an insulator
act like a conductor

5Which lists the layers in a PNP transistor from the least negative to the most negative?

emitter, base, collector
base, emitter, collector
collector, base, emitter
collector, emitter, base

6Roland writes a story in which boaters become stranded on a sandy island. In the story, they set about collecting materials to create semiconductors to repair computer components in their radio.

Which problem is likely to be the most difficult for Roland’s characters to overcome?

There are no semiconductor elements on the island.
Any substances they find are too impure.
They lack materials to make a p-type semiconductor.
No conductors are available to connect the components.