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12th ICSE
IMPORTANT
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 A transistor cannot be used as rectifier. Why?

Important Questions on Junction Transistors

HARD
12th ICSE
IMPORTANT
ISC Physics Class 12, Part-2>Chapter 20 - Junction Transistors>QUESTIONS>Q 7
What is common-emitter amplifier?
HARD
12th ICSE
IMPORTANT
ISC Physics Class 12, Part-2>Chapter 20 - Junction Transistors>QUESTIONS>Q 8
Under normal use of transistors, the emitter is forward- biased and the collector is reverse-biased. Can either of these biasing be changed? Explain.
HARD
12th ICSE
IMPORTANT
ISC Physics Class 12, Part-2>Chapter 20 - Junction Transistors>QUESTIONS>Q 9
Explain why the input resistance of a transistor is low while the output resistance is high.
HARD
12th ICSE
IMPORTANT
ISC Physics Class 12, Part-2>Chapter 20 - Junction Transistors>QUESTIONS>Q 10
In a transistor, forward-bias is always smaller than the reverse-bias. Why?
MEDIUM
12th ICSE
IMPORTANT
ISC Physics Class 12, Part-2>Chapter 20 - Junction Transistors>QUESTIONS>Q 11
How will you test whether a transistor is damaged or in working order?
HARD
12th ICSE
IMPORTANT
ISC Physics Class 12, Part-2>Chapter 20 - Junction Transistors>QUESTIONS>Q 1

What is an n-p-n transistor? Give its symbol and describe its working. Why is it more useful in comparison to p-n-p transistor?

HARD
12th ICSE
IMPORTANT
ISC Physics Class 12, Part-2>Chapter 20 - Junction Transistors>QUESTIONS>Q 2
Describe briefly, with the help of a diagram, an n-p-n or p-n-p transistor. Define current gain for a transistor.
HARD
12th ICSE
IMPORTANT
ISC Physics Class 12, Part-2>Chapter 20 - Junction Transistors>QUESTIONS>Q 3
Draw a neat circuit diagram to study the input and output characteristics of a common emitter transistor.