Introductory Electronics - Jamb Physics Past Questions and Answers

Question 16:

• JAMB 2006

A certain manufacturer wishes to make an n-type semiconductor. Which materials would he select for doping?

A. Boron and antimony
B. Boron and antimony
C. Aluminium and indium
D. Arsenic and antimony

Question 17:

• JAMB 2006

A p-n junction diode is used as?

A. A rectifier in a d.c circuit
B. An amplifier in d.c circuit
C. An anplifier in an a.c circuit
D. A rectifier in an a.c circuit

Question 18:

• JAMB 2007

Silicon doped with aluminum and germanium doped with arsenic become?

A. P- and n- types respectively
B. N- en p- type respectively
C. P- type semiconductor
D. N- type semiconductors

Question 19:

• JAMB 2008

When a pure semiconductor is heated, its resistance

A. Increases
B. Decreases
C. Remains the same
D. Increases and then decreases

Question 20:

• JAMB 2009

When a pentavalent impurity is added to a pure semiconductor, it becomes

A. A p-type semiconductor
B. An n-type semiconductor
C. An insulator
D. An intrinsic semi-conductor