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1. How many electrons are there in the forth orbit of a copper atom?
A. 1
B. 2
C. 3
D. 4
2. The Maximum permissible number of electrons is the third orbit is
A. 18
B. 8
C. 32
D. 2
3. Varactor diodes are commonly used
A. AS Voltage controlled capacitance
B. As a constant current source
C. As Voltage multiplier
D. As a constant Voltage source
4. The reason why electrons are not pulled into the nucleus of an atom.
A. Because of the centrifugal or outward force created by their orbital motion.
B. Because of the force of attraction between them and nucleus is weak.
C. Because they are not being attracted by the positive nucleus.
D. Because of the strong bonding between them that resists any force pulling them towards the nucleus.
5. The electrons n the largest orbit travel ________ than the electrons in the smaller orbits.
A. More Slowly
B. Faster
C. In the same velocity
D. A little bit slower
6. A transistor configuration with the lowest current gain.
A. Common base
B. Common emitter
C. Common Collector
D. Emitter-follower
7. A semiconductor in its purest from is called
A. Pure semiconductor
B. Doped Semiconductor
C. Intrinsic semiconductor
D. Extrinsic semiconductor
8. Valence orbit is the other form for
A. Outer orbit
B. 3rd Orbit
C. 4th Orbit
D. 2nd orbit
9. K shell means
A. First orbit
B. 2nd orbit
C. 3rd orbit
D. 4th orbit
10. For either germanium or silicon diodes, the barrier potential decreases _______ for each Celsius degree rise.
A. 1 mV
B. 3 mV
C. 4 mV
D. 2 Mv
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