Physics Past Questions

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1236

The p-n junction diodes can act as rectifiers because they

A. conduct current when forward-biased
B. conduct current when reverse-biased
C. block current when forward-biased
D. conduct current in both directions

View Answer & Discuss (11) JAMB 2012

1237

If a reverse-biased voltage is applied across a p-n junction, the depletion layer width is

A. increased
B. decreased
C. constant
D. halved

View Answer & Discuss (12) JAMB 2012

1238

I. Small size.
II. Low power requirement
III. Not easily damaged by high temperature
IV. Highly durable.

Which of the above are the advantages of semiconductors?

A. I,II and lll only
B. ll,lll and lV only
C. l, II and lV only
D. l, ll, lll and lV

View Answer & Discuss (7) JAMB 2012

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1239

A bullet fired at a wooden block of thickness 0.15m manages to penetrate the block. If the mass of the bullet is 0.025kg and the average resisting force of the wood is 7.5 x 10³N, calculate the speed of the bullet just before it hits the wooden block.