electric current and magnetism - Category wise Question and Answer Practice Test with Solutions
electric current and magnetism PRACTICE TEST [9 - EXERCISES]
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set 4
set 5
set 6
set 7
set 8
set 9
Question : 27
In an unbiased p-n junction, holes diffuse from the p-region to n-region because
a) they move across the junction by the potential difference.
b) hole concentration in p-region is more as compared to n-region.
c) free electrons in the n-region attract them.
d) all the above
Answer »Answer: (b)
Question : 30
An n-p-n transistor conducts when
a) both collector and emitter are positive with respect to the base
b) collector is positive and emitter is negative with respect to the base
c) both collector and emitter are negative with respect to the base
d) collector is positive and emitter is at same potential as the base
Answer »Answer: (b)
When the collector is positive and emitter is negative w.r.t. base, it causes the forward biasing for each junction, which causes conduction of current.
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