Solid State Devices

211. What is another name for a pn crystal

1. Junction diode
2. PN junction
3. Diode
4. Lattice

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212. What is approximate mass of an electron at rest?

1. 9.1096 x 10∧-31 kg
2. 1.6726 x 10∧-27 kg
3. 1.6762 x 10∧-31 kg
4. 1.7588 x 10∧11 kg

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213. What is approximately the sum of the number of protons and neutrons of an atom?

1. Atomic mass
2. Atomic number
3. Atom subscript
4. Valence shell

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214. What is associated with random motion due to thermal agitation in the movement of holes and electrons in a silicon crystal?

1. Drift
2. Diffusion
3. Doping
4. Recombination

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215. What is considered as the key electrical conductivity?

1. The number of electrons in the valence orbit
2. The number of protons in the nucleus
3. The number of neutrons in the nucleus
4. The number of protons plus the number of electrons in the atom

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216. What is the approximate mass of a neutron at rest?

1. 1.6726 x 10∧-27 kg
2. 9.1096 x 10∧-31 kg
3. 1.6022 x 10∧-19 kg
4. No mass

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217. What is the approximate voltage drop of LED?

1. 0.3 V
2. 0.7 V
3. 1.5 V
4. 3.8 V

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218. What is the barrier potential of germanium at 25°C

1. 0.7 V
2. 0.3 V
3. 0.5 V
4. 0.4 V

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219. What is the charge of the hole?

1. Equal to that of a proton
2. Equal to that of an electron
3. Equal to that of a neutron
4. Equal to zero

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220. What is the dc resistance of the JFET in the ohmic region if the drain to source current at gate shorted is equal to 20 mA and the pinch off voltage is 5 \ volts?

1. 300 Ω
2. 250 Ω
3. 1 kΩ
4. 100 Ω

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