Modern Materials
Arthur C Clark the famous science fiction author while working as a radio operator in the World War –II
Proposed building a space elevator from carbon mono filaments
Postulated the existence of extra terrestrial artifacts on the moon
Proposed that a network of satellite in stationary orbit at very high altitudes around the earth be used to bounce communication signals all over the world
None of these
Proposed that a network of satellite in stationary orbit at very high altitudes around the earth be used to bounce communication signals all over the world
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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
The Sino Pakistan JF Thunder Aircraft
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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