Which of the following materials does not have covalent bonds ?
A. Organic polymers
B. Silicon
C. Metals
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Super conductivity can be destroyed by_____________?
A. Adding impurities
B. Reducing temperatures
C. Application of magnetic field
D. Any of the above
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Which of the following affect greatly the resistivity of electrical conductors ?
A. Composition
B. Pressure
C. Size
D. Temperature
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__________ is a hard solder?
A. Tin-lead
B. Tin-silver-lead
C. Copper-zinc
D. None of the above
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Most of the common metals have _________ structure?
A. Linear
B. Hexagonal
C. Orthorhombic
D. Cubic
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Addition of 0.3 to 4.5% silicon to iron ________ the electrical resistivity of iron?
A. Increases
B. Decreases
C. Does not change
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Thermonic emission occurs in______________?
A. Vacuum tubes
B. Copper conductors
C. Ferrite cores
D. Transistors
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A good electric contact material should have all of the following properties except_____________?
A. High resistivity
B. High resistance to corrosion
C. Good thermal conductivity
D. High melting point
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_________ is an example of piezoelectric material?
A. Glass
B. Quartz
C. Corrundum
D. Neoprene
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Piezoelectric materials serve as a source of ____________ ?
A. Resonant waves
B. Musical waves
C. Microwaves
D. Ultrasonic waves
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Word of the Day
15 Sep
Preferential
of or involving preference or partiality; constituting a favour or privilege.
ترجیحی، رعاعیتی، ترجیح پانےوالا

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