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1. At room temperature the current in an intrinsic semiconductor is due to A. holes B. electrons C. ions D. holes and electrons Answer: D 2. Work function is the maximum energy required by the fastest electron at 0 K to escape from the metal surface. A. True B. False Answer: B 3. The most commonly used semiconductor material is A. silicon B. germanium C. mixture of silicon and germanium D. none of the above Answer: A 4. In which of these is reverse recovery time nearly zero? A. Zener diode B. Tunnel diode C. Schottky diode D. PIN diode Answer: C 5. A transistor has a current gain of 0.99 in the CB mode. Its current gain in the CC mode is A. 100 B. 99 C. 1.01 D. 0.99 Answer: A 6. The amount of photoelectric emission current depends on A. frequency of incident radiation B. intensity of incident radiation C. both frequency and intensity of incident radiation D. none of the above Answer: B 7. Assertion (A): A p-n junction has high resistance in reverse direction. Reason (R): When a reverse

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