Introductory Electronics - Physics Jamb Past Questions and Answers

Question 1 :

• JAMB 2019

If the time of flight is 96seconds, calculate the horizontal range through the point of projection.

A. 84400m
B. 69000m
C. 61440m
D. 24000m

Question 2 :

• JAMB 1994

If light with photon energy 2eV is incident suitably on the surface of a metal with work function 3eV, then

A. No electron will be emitted
B. The few electrons emitted will have a maximum kinetic energy of 1eV
C. The few electrons emitted will have a maximum kinetic energy of 3eV
D. Many electrons will be emitted

Question 3 :

• JAMB 2000

in a pure semiconductor, the number of electrons in the conduction band is

A. Less than the number of holes in the valence band
B. Equal to the number of holes in the valence band
C. Greater than the number of holes in the valence band
D. Twice the number of holes in the valence band

Question 4 :

• JAMB 2002

Pure silicon can be converted to a p-type by adding a controlled amount of

A. Trivalent atoms
B. Tetravalent atoms
C. Pentavalent atoms
D. Hexavalent atoms

Question 5 :

• JAMB 2003

In a semi conductor junction diode, as the depletion or barrier layer is forward-biased, the layer

A. Widens
B. Narrows
C. Remains constant
D. Widens then narrows