Science and Technology MCQ Set 52
Showing question 256 to 260 of total 301 MCQs
MCQ Set: 52
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Question No: 256
How many launches per year is ISRO trying to achieve?
- 12
- 10
- 8
- 5
Answer and Explanation
Answer: A
Explanation
The Indian Space Research Organisation is trying to increase its capacity to deliver by scaling up the frequency of launches to 12 per year from the seven at present.
This is building more satellites and lowering the cost of access to space.
ISRO is trying to go up to 8-9 PSLV per year, two GSLV-Mk II and one GSLV-Mk III. Total about 12 per year,.
ISRO is trying to increase its capacity to deliver by scaling up the frequency of launches by building more satellites, lowering the cost of access to space and also to do heavier satellite launches.
The space agency is in the process of constructing a second vehicle assembly building to improve the turnaround time and throughput for the PSLV so that with the same launch pad ISRO can do more launches, he said.
ISRO plans to undertake the Chandrayaan-2 mission in the first quarter of the next calendar year.
ISRO has identified its next steps in terms of air-breathing propulsion system.
Question No: 257
Which ISS commander surpassed the record of 534 days, 2 hours and 48 min for most time in space by an American?
- Peggy Whitson
- Kalpana Chawla
- Sunita Williams
- None of the above
Answer and Explanation
Answer: A
Explanation
The International Space Station's commander Peggy Whitson surpassed the record of 534 days, two hours and 48 minutes for most accumulated time in space by an American.
Whitson already was the world's most experienced spacewoman and female spacewalker and, at 57, the oldest woman in space.
By the time she returns to Earth in September, she'll have logged 666 days in orbit over three flights.
The world record, 879 days, is held by Russian Gennady Padalka.
Whitson broke the NASA cumulative record set last year by astronaut Jeffrey Williams; Scott Kelly holds the US record for consecutive days in space, 340.
Whitson is also the first woman to command the space station twice and the only woman to have led NASA's astronaut corps.
NASA astronaut Jack Fischer, who arrived at the space station last week and took part in Monday's call, said the space station is "by far the best example of international cooperation.''
Whitson told the president that spaceflight takes a lot of time and money, so getting to Mars will require collaboration from other countries to succeed.
NASA is building the hardware right now to test a new rocket that will carry astronauts farther from Earth than ever before, she said.
Question No: 258
ISRO has launched an Android app for computing _____ energy potential of a place.
- solar
- wind
- thermal
- coal
Answer and Explanation
Answer: A
Explanation
The Indian Space Research Organisation (ISRO) today said its Ahmedabad-based Space Applications Centre has developed an android app for computing the solar energy potential of a place.
Developed at the behest of the Union Ministry of New and Renewable Energy, the app is considered to be a "very useful" tool for installation of photovoltaic (PV) solar panels that is used for tapping solar energy.
The ISRO said the app provides monthly and yearly solar potential and the minimum and the maximum temperatures at any location.
It also displays the location of a place on the satellite image as well as the day's length there during different periods in a year.
According to ISRO, features of the app include providing of solar energy potential at any given location, the required location can be keyed in or can be obtained through GPS.
It said it also gives monthly and yearly solar potential processed using Indian Geostationary Satellite data (Kalpana- 1, INSAT-3D and INSAT-3DR), and also offers monthly minimum and maximum temperature to calculate the realistic solar potential.
The obstruction of sunlight due to terrain is also calculated using Digital Elevation Model (DEM) with the help of the app which also suggests optimum tilt angle for the solar PV installation
Question No: 259
Which new mega app incorporates railway apps and is set for release in June 2017?
- HindRail
- MeriRail
- Erail
- MyRail
Answer and Explanation
Answer: A
Explanation
In June, train travel- related queries will be answered through one mega application, likely to be named HindRail, which incorporates in it most of the existing railways' apps.
The Indian Railways is developing the new app to work as a full-fledged inquiry system providing information on arrivals, departures, delays, cancellations, platform number, running status and berth availability.
Besides, it will also offer booking of taxis, porter services, retiring rooms, hotels, tour packages, e-catering and other travel-related needs.
IR will offer all these services on a revenue- sharing model with the service providers.
Thus, the app will serve as a revenue-earning platform for the public transporter and is slated to have a business potential INR 100 crore every year.
The new app will be launched in June and it will not only give you information, you can also track trains through it.
Currently, there are several apps operated by the Indian Railways which provide various kinds of services. These include the CMS App for complaint management system.
The National Train Enquiry System (NTES) app provides inquiry facility. There are apps for booking reserved and unreserved tickets. There is another app managed by the IRCTC for the e-catering services.
All these will be integrated in the proposed app.
Other suggested names were MeriRail, ERail, MyRail and Rail Anubhuti.
Question No: 260
Which material is now being used to print 3D objects that can be used to make small computer optical components?
- Glass
- Steel
- Graphene
- Polymers
Answer and Explanation
Answer: A
Explanation
Scientists have developed a novel way to 3D-print objects using glass, an advance that could be used to make very small optical components for complex computers.
Researchers mixed nanoparticles of high-purity quartz glass and a small quantity of liquid polymer and allowed the mixture to be cured by light at specific points — by means of stereolithography.
The 3D-printed glass can be used for many applications, including data technology.
The next plus one generation of computers will use light, which requires complicated processor structures, 3D technology could be used, for instance, to make small, complex structures out of a large number of very small optical components of different orientations.
What Is Stereolithography?
Stereolithography is a form of 3D-printing technology.
It is used for creating models, prototypes, patterns and production parts in a layer by layer fashion
It uses photo-polymerisation, a process by which light causes chains of molecules to link, forming polymers.
The material, which remains a liquid, is washed out in a solvent bath, leaving only the desired cured structure.
The polymer still mixed in this glass structure is subsequently removed by heating.
A variety of 3D-printing techniques available so far have been used on polymers or metals, but rarely on glass.
Where glass was processed into structures, for instance by melting and application by means of a nozzle, the surface turned out to be very rough, the material was porous and contained voids.
Researchers presented a new method, an innovation in materials processing, in which the material of the piece manufactured is high-purity quartz glass with the respective chemical and physical properties.
The glass structures show resolutions in the range of a few micrometres — one micrometre corresponding to one thousandth of a millimetre.
However, the structures may have dimensions in the range of a few centimetres, researchers said.