Vacuum tubes have been replaced by: (CSS 2013)
(a) Conductors
(b) Diodes
(c) Transistors
(d) None of these
Answer: (c)
Arthur C Clark the famous science fiction author while working as a radio operator in the World War –II (CSS 2012)
(a) Proposed building a space elevator from carbon mono filaments
(b) Postulated the existence of extra terrestrial artifacts on the moon
(c) 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
(d) None of these
Answer: (c)
Photography works by (CSS 2012)
(a) Capturing the souls of the objects being photographed
(b) Capturing light reflected from the object being photographed
(c) Both A &B
(d) None of these
Answer: (c)
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The Sino Pakistan JF Thunder Aircraft (CSS 2012)
(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
Answer: (c)
Communication satellite are in (CSS 2012)
(a) Geostationary orbit
(b) Geosynchronous orbit
(c) Semi synchronous orbit
(d) None of these
Answer: (a)
The usual raw material for ceramics, generally found beneath the top soil is? (CSS 2011)
(a) Sand
(b) Slit
(c) Clay
(d) Plaster of Paris
(e) Melamine
Answer: (c)
Polyamides are synthetic polymers commonly known as: (CSS 2011)
(a) Synthetic rubber
(b) Nylon
(c) Cellulose
(d) Protein
(e) None of these.
Answer: (b)
Telephone was invented in 1876 in America by: (CSS 2011)
(a) Marconi
(b) Galileo
(c) John Beard
(d) Edison
(e) Graham Bell.
Answer: (e)
Information can be sent over long distances in the form of: (CSS 2011)
(a) Electrical signals through wires
(b) Light signals through optical fibers
(c) Radio waves through air
(d) Any combination of these three.
(e) None of these
Answer: (d)
Which of the following layers make radio transmission possible? (CSS 2009)
(a) Troposphere(b) Ionosphere
(c) Mesosphere(d) Stratosphere
(e) None of these
Answer: (b)
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Television signals are converted into light signals by: (CSS 2009)
(a) Optical fiber(b) Transistor
(c) Decoder(d) Photo diode
(e) None of these
Answer: (d)
Telephone was invented by? (CSS 2008)
Alexander Graham Bell
Bakelite, Polyester is which type of plastics – (CSS 2008)
Thermosetting plastics
Generators convert mechanical energy into electricity. (CSS 1997)
True
We can receive TV sound signal on our FM radio sets. (CSS 1996)
True
Sound can travel through vacuum. (CSS 1996)
False
The function of the thermostat in a refrigerator is: (CSS 1992)
(a) To increase the freezing point
(b) To lower the temperature
(c) To maintain the temperature
(d)None of these
Answer: (c)
The removal of top soil by water or wind is called (CSS 1991)
(a) Soil wash(b) Soil erosion
(c) Soil creep(d) Silting of soil
Answer: (b)
The mercury in set amalgam is mainly in the form of:
(a) mercury salts
(b) methyl mercury
(c) intermetallic compounds
(d) elemental mercury
(e) none of the above
Answer: (b)
In the diagram, the missing factor is:
(a) temperature
(b) material function
(c) environment
(d) surface morphology
(e) none of the above
Answer: (b)
In the usage of acrylic resins for denture construction, biocompatibility is improved by minimizing the quantity of which constituent?
(a) benzoyl peroxide
(b) tertiary amine
(c) methyl methacrylate
(d) PMMA
(e) camphor quinon
Answer: (c)
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Which of the following combinations of cements sets by an acid-base reaction only?
(a) adhesive resn cement and zinc polycarboxylate cement
(b) calcium hydroxide and glass-ionomer
(c) resin-modified glassionomer and zinc phosphate
(d) glass-ionomer and resin-modified glass-ionomer
(e) resin cement and zinc oxide eugenol
Answer: (b)
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
(e) aluminum and fluoride
Answer: (b)
In terms of flexural strength, the strongest ceramic is:
(a) glass-infiltrated alumina
(b) zirconia
(c) castable ceramics
(d) feldspathic porcelain
(e) aluminous porcela
Answer: (b)
The typical volumetric firing shrinkage of a conventional powder-slurry ceramic is:
(a) l%
(b) 5%
(c) 10%
(d) 20%
(e) 30-40%
Answer: (e)
Feldspars are:
(a) naturally occurring anhydrous aluminosilicates
(b) synthetic anhydrous aluminosilicates
(c) naturally occurri ng hydrous aluminosilicates
(d) synthetic hydrous aluminosilicates
(e) none of the above
Answer: (a)
A common mechanism of failure of ceramics is:
(a) movement of dislocations
(b) propagation of cracks
(c) ductile failure
(d) creep
(e) none of the above
Answer: (b)
In general terms, in contrasting metallic and ceramic materials:
(a) ceramics are less durable chemically than metals
(b) most metals are more brittle than most ceramics
(c) most ceramics are more brittle than most metals
(d) none of the above
Answer: (c)
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