Q.1 Consider the statements relating to plasma polymerisation technology that is in news:
1)This innovation is helpful to purify water through the rapid removal of oily pollutants
2) It develops surface engineered silica particles for oil removal
Codes:
A) Only 1
B) Only 2
C) Both are correct
D) both are incorrect
Ans. C
Q.2 Consider the statements relating to new technology “new lighting solution” :
1) New lighting solution is at least twice as efficient as compact fluorescent (CFL) bulbs and on par with LEDs
2) These bulbs won’t shatter and contaminate a home like CFLs or emit a bluish light like LED counterparts.
3) They get to full brightness when they’re switched on comparing to CFL in which Slow warm-up is one of the big irritants.
Options:
A) 1 &3
B) 2 & 3
C) 1,2,3
D) Only 2
Ans. C
Q.3 Consider the statements relating to Aakash 2 tablet:
1) This tablet has better & advanced features including webcam & bluetooth
2) Internet dongle like TATA, Reliance and Other services to browse net are not available.
3) One can easily connect You Ubislate 7 via GPRS or WiFi.
Codes:
A) 1 & 2
B) Only 2
C) only 3
D) 2 & 3
Ans. D
Q. 4 Consider the differences between Plasma TV & LCD TV :
1) LCD (Liquid Crystal Display) televisions are primarily composed of a liquid crystal solution divided into individual pixels, which is sandwiched between two glass plates while in Plasma TV the panels house thousands of gas in which electrical current is used to turn the gas into plasma, which generates an ultraviolet light that causes the phosphors to glow, creating the desired image.
2) LCDs have better resolution,longer life span & viewing distance comparative to Plasma TV.
3) plasma TV has greater contrast ratio, screen size & viewing angle comparative to LCD.
Codes:
A) Only 1
B) 1 & 3
C) 2 & 3
D) 1,2,3
Ans. D
How does LCD technology work?
LCD (Liquid Crystal Display) televisions are primarily composed of a liquid crystal solution divided into individual pixels, which is sandwiched between two glass plates. A backlight is used to beam light through the first plate, and an electrical current is passed through the crystals. The amount of charge applied to each crystal causes it to allow a certain degree of light to pass through. The resulting crystal formation is what forms the displayed image.
How does Plasma technology work?
Like LCDs, Plasma screens are composed of two glass panels. The difference between the two technologies lies in the substance between these two panels. Instead of filtering light, the panels house thousands of gas chambers, each behind red, blue, and green phosphors. An electrical current is used to turn the gas into plasma, which generates an ultraviolet light that causes the phosphors to glow, creating the desired image.
What are the advantages of LCD?
Better resolution
LCDs generally have higher native resolutions in comparison to their Plasma alternatives. It is much more common to find an LCD TV outputting 1080p HDTV resolution than a Plasma TV.
Longer lifespan
LCD displays are generally regarded as longer-lasting than Plasmas, although both these time frames are quite large. For example, the 60,000 hour life span of an LCD TV would mean that even if you watched TV for 24 hours a day, 365 days a year, you would still get more than 6 years of usage.
Viewing distance
The pixel structure and panel measurements of LCDs allow these television to output a smoother picture than their Plasma equivalents. As a result, at closer distances the pixel structure of LCD screens is less visible.
What are the disadvantages of LCD?
Dead pixel susceptibility
Over their lifespan, individual pixels on an LCD television can burn out which stops them functioning correctly. As a result a small black or white dot can permanently appear on an LCD screen. While this is often unnoticeable, large clusters of dead pixels can become an annoyance.
Blurring
Due to higher pixel response times, during high motion scenes such as in action films or sporting events LCD televisions can experience blurred images. However, newer LCD models have lowered the pixel response time, making blurring less of an issue during fast moving scenes.
Viewing angle
As LCDs were initially designed as single-user computer monitors there is a gradual degradation in picture quality as you view LCD televisions from wider angles.
What are the advantages of Plasma?
Greater contrast ratio
A television’s contrast ratio is a measure between the darkest and lightest colours outputted. Plasma televisions frequently boast far higher contrast ratios than LCDs and so are able to display deeper blacks.
Screen size
As Plasma technology is widely believed to more suitable for larger size televisions there is a wider range of large, 40 inch plus Plasma televisions available in comparison to LCD offerings.
Viewing angle
As the pixels on Plasma televisions produce their own individual light, Plasma televisions boast higher viewing angles. This is ideal if you will not always be viewing the television from directly in front of it.
What are the disadvantages of Plasma?
Burn in
Plasmas, unlike LCD screens, are susceptible to screen burn in. This occurs if the same image is displayed for a prolonged amount of time, causing an outline of the image to be permanently burnt into the screen.
Power consumption
Plasma televisions typically require much more electricity than an LCD television since instead of a using a fluorescent backlight like in an LCD, Plasma TVs require than each individual pixel is illuminated.
Resolution output
Plasma televisions tend to output in resolutions of 1024×728 and then use internal scalars to display high definition resolutions of 720p or 1080p. LCD televisions often use these HDTV resolutions natively.
Q. 5 Scientists have innovated new technique to improve quality control of lithium-ion batteries, consider the statements;
1) Lithium ions travel from the anode to the cathode while the battery is being charged and in the reverse direction when discharging energy.
2) This method uses a flashing xenon bulb to heat the copper side of the electrode, and an infrared camera reads the heat signature on the black side, producing a thermal image.
Options:
A) Only 1
B) Only 2
C) Both are correct
D) Both are incorrect
Ans. C
Researchers have created a new tool to detect flaws in lithium-ion batteries as they are being manufactured, a step toward reducing defects and inconsistencies in the thickness of electrodes that affect battery life and reliability.
The electrodes, called anodes and cathodes, are the building blocks of powerful battery arrays like those used in electric and hybrid vehicles. They are copper on one side and coated with a black compound to store lithium on the other. Lithium ions travel from the anode to the cathode while the battery is being charged and in the reverse direction when discharging energy.
The coating is a complex mixture of carbon, particulates that store lithium, chemical binders and carbon black. The quality of the electrodes depends on this “battery paint” being applied with uniform composition and thickness.
Q. 6 In world of technology there is a new term LIFI, consider the statements:
1) In LIFI modulated signal is light whereas in WIFI modulated signal is radiowave.
2) LIFI has higher bandwidth than WIFI
3) Direct line of sight is essential in LIFI but it is not in WIFI
Codes:
A) 1 & 3
B) 2 & 3
C) 1 & 2
D) 1,2,3
Ans. D
Li-Fi is a label for wireless-communication systems using light as a carrier instead of traditional radio frequencies, as in Wi-Fi.
In October 2011 a number of companies and industry groups formed the Li-Fi Consortium, to promote high-speed optical wireless systems and to overcome the limited amount of radio-based wireless spectrum available by exploiting a completely different part of the electromagnetic spectrum. The consortium believes it is possible to achieve more than 10 Gbps, theoretically allowing a high-definition film to be downloaded in 30 seconds.
Li-Fi has the advantage of being able to be used in sensitive areas such as in aircraft without causing interference. However, the light waves used cannot penetrate walls.
