B.Sc. DEGREE EXAMINATION, APRIL 2018
Fourth Semester
Computer Science
APPLIED PHYSICS II
(2016 onwards)
Time 3 Hours Maximum 75 Marks
Part A (10 x 2 20)
Answer all questions.
1. Define energy band.
2. Draw the symbol of a tunnel diode.
3. What are hybrid parameters?
4. What is a pnp transistor?
5. What is meant by Laser?
6. Give any two advantages of He-Ne laser.
7. Define luminent efficiency.
8. What is meant by photoconductions?
9. Give the block diagram of an operational amplifier.
10. What is meant by comparator?
Sub. Code
46
CP-8766
2
Wk 10
Part B x 5 25)
Answer all questions.
11. Distinguish between conductors, insulators and
semi conductors.
Or
Explain avalanche break down.
12. Sketch the V-I characteristics of an NPN transistors
in CE configuration and explain.
Or
With a neat circuit diagram, explain the working of
FET amplifier.
13. Explain population inversion and meta stable state.
Or
Discuss the principle and working of a Ruby laser.
14. Write a note on the following
Method of excitation in LED.
Electronic watches.
Or
What is a photo diode? Explain, how does a photo
diode work.
15. Explain CMRR and give the importance of CMRR.
Or
Discuss the A/c successive approximation with a
neat circuit diagram.
CP-8766
3
Wk 10
Part C X 10 30)
Answer all questions.
16. Explain n-type semi conductor and discuss its
energy band.
Or
Discuss in detail the function of a transistor as
Amplifier
Oscillator.
17. Briefly explain stimulated emission with a neat
energy level diagram. And give the advantages of
laser.
Or
Discuss the LED configuration and its performance
in detail.
18. With a neat circuit diagram explain
D/C binary weighted method
R-2R ladder method.
Or
Explain
Inverting amplifier
Non-inverting amplifier.
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