Modern Materials
Feldspars are:
naturally occurring anhydrous aluminosilicates
synthetic anhydrous aluminosilicates
naturally occurri ng hydrous aluminosilicates
synthetic hydrous aluminosilicates
naturally occurring anhydrous aluminosilicates
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In a glass ionomer cement, the ions that cause the material to set are:A. zinc and calcium
B. aluminum and calcium
C. aluminum and zinc
D. calcium and fluoride
Which of the following layers make radio transmission possible?
A. Troposphere
B. Ionosphere
C. Mesosphere
D. Stratosphere
The function of the thermostat in a refrigerator is:
A. To increase the freezing point
B. To lower the temperature
C. To maintain the temperature
D. None of these
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A. Is a commercial transport aircraft
B. Is neither built nor assembled in Pakistan
C. Has no stealth features in its engine inlets or elsewhere
D. None of these
A common mechanism of failure of ceramics is:
A. movement of dislocations
B. propagation of cracks
C. ductile failure
D. creep
The mercury in set amalgam is mainly in the form of:
A. mercury salts
B. methyl mercury
C. intermetallic compounds
D. elemental mercury
Polyamides are synthetic polymers commonly known as:
A. Synthetic rubber
B. Nylon
C. Cellulose
D. Protein
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