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ALAGAPPA
UNIVERSITY
KARAIKUDI – 630 003
UNIT BASED ONLINE EXTERNAL EXAMINATION - NOVEMBER – 2020
FIFTH
SEMESTER SLOT – III
SOLID STATE PHYSICS - 7BPHE2C
Total Marks: 25 Time: 1.0 Hr
SECTION A – SHORT ANSWER - 5 x 2 = 10 Marks
ANSWER ALL THE QUESTIONS
1. Give
any two applications of photo diode.
2. Draw neat
diagram of a solar cell.
3. Distinguish
between photo conductivity and electrical conductivity.
4. Define the
unit of photo conductivity.
5. Give few
applications of semiconductors.
SECTION B - DESCRIPTIVE - 3 x 5 = 15 Marks
ANSWER ANY THREE
6. Describe the
applications of solar cells.
7. Briefly
discuss Josephson effect.
8. Explain
photo conductivity and discuss its’ applications.
9. What is
meant by Meissner effect?
10. Distinguish
between metals, insulators and semiconductors.