Test 1: Semiconductors, PN Junction, Diode and LED

Question 1

A diode allows current to flow in:

• Aboth directions
• Bneither direction
• Cone direction only
• Drandom directions

Question 2

What is the primary function of a light-emitting diode?

• ATo block current in both directions
• BTo emit light when current passes in one direction
• CTo amplify electrical signals
• DTo convert light into electrical energy

Question 3

Electronics is a branch of science that deals with the study and control of the flow of:

• Aprotons in nuclei
• Belectrons in devices and circuits
• Cneutrons in reactors
• Dphotons in space only

Question 4

Semiconductors are materials whose electrical conductivity lies between that of:

• Ametals and alloys
• Bconductors and insulators
• Cgases and liquids
• Dmagnets and conductors

Question 5

The most common semiconductors are:

• Acopper and iron
• Bsilicon (Si) and germanium (Ge)
• Ccarbon and sulphur
• Dgold and silver