Why rayon is call artificial silk?

Harshita Jain answered  •  30 minutes ago
Rayon is called artificial silk because this fibre resembles silk in properties. It is obtained by chemical treatment of wood pulp of cotton.

Can you explain the answer of this question below:
What did weavers in Silesia, in 1845, revolt against? 
  • A:
    Bad quality raw material
  • B:
    Insufficient supply of raw material
  • C:
    Contractors who didn't pay them enough
  • D:
    None of these
The answer is c.

Harshita Jain answered  •  32 minutes ago
The purpose of the ‘Silesian Weavers’ revolution was due to the dishonesty of the weavers by the constructors. In 1845, the weavers fostered a revolution upon the entrepreneurs as the contractors drastically decreased their payments.

Consider the following with reference to Archean rock system in India belonging to certain geologic periods.
1. The Archean rock system in India can be found in Aravali Mountains.
2. This rock system contains non-metallic minerals only.
3. It contains mainly metamorphic sedimentary rocks.
4. It is the oldest rock system in India. 
  • a)
    1, 3 and 4 only
  • b)
    2 and 3 only
  • c)
    1 and 4 only
  • d)
    1, 2, 3 and 4
Correct answer is option 'C'. Can you explain this answer?

Yashvanti answered  •  3 hours ago
justification: Statement 1: It is found in Aravali Mountains, two-thirds of the Deccan peninsula and some parts of north east.
Statement 2: These rocks have abundant metallic and non-metallic minerals such as iron, copper, manganese, bauxite, lead, zinc, gold, silver, tin, tungsten, mica, asbestos, graphite, etc.
Statement 3: It is the “Dharwar” Rock System which is the first metamorphic sedimentary rocks in India.
Statement 4: These are the oldest followed by Dharwar rocks. Tertiary rocks are the youngest.

Energy is harnessed from Tides using 
  • a)
    Temperature difference between high and low tides
  • b)
    The potential energy of high tides
  • c)
    Flow of Ocean currents during low tides
  • d)
    All of the above
Correct answer is option 'B'. Can you explain this answer?

Prem Lata answered  •  3 hours ago
Justification: Tidal energy can be harnessed by building dams at narrow openings of the sea. During high tide the energy of the tides is used to turn the turbine installed in the dam to produce electricity.
Russia, France and the Gulf of Kachchh in India have huge tidal mill farms. 
Q Source: Chapter 3: Class 8th NCERT: Resource and Development

ECOLEX is a/an
  • a)
    Biodiversity-related legal resource
  • b)
    Protocol under UNFCCC to reduce global warming
  • c)
    Initiative towards restoring forests in Least Developed Countries (LDCs)
  • d)
    Compendium of regions of high ecological richness and diversity
Correct answer is option 'A'. Can you explain this answer?

Roshani Devi answered  •  3 hours ago
Learning: ECOLEX is a web-based information service operated jointly by the Food and Agriculture Organization of the UN (FAO), the International Union for the Conservation of Nature (IUCN) and the UN
Environmental Program (UNEP).
Effective international and domestic laws and policies are a cornerstone to biodiversity conservation.
ECOLEX is the most comprehensive global source of national and international environmental and natural
resources law and policy.
The ECOLEX user can access legal and policy instruments - international agreements, legislation, judicial  decisions, law and policy literature - relating to ecosystems, species and genetic resources as well as other sectors affecting biodiversity such as agriculture, fisheries, forestry, mining and water.

LISA Pathfinder, a mission led by the European Space Agency (ESA), was recently in news. Why?  
  • a)
    It successfully tested a key technology needed to build a space-based observatory for detecting gravitational waves.
  • b)
    It decoded the pattern of Andromeda galaxy.
  • c)
    It made the first landing on a rocky comet, collected sample and is travelling back to Earth.
  • d)
    It reached a Sun-synchronous orbit in the least amount of time.
Correct answer is option 'A'. Can you explain this answer?

Attro answered  •  3 hours ago
Learning: It is a space-based observatory.
■  LISA pathfinder would help LIGO’s (a ground based gravitational waves observatory) work.
■  Seismic, thermal and other noise sources limit LIGO to higher-frequency gravitational waves.
■  But finding signals from more exotic events, such as mergers of supermassive black holes in colliding galaxies, requires the ability to see subtle frequencies, a sensitivity level only possible from space.
■  So, LISA Pathfinder was intended as a stepping stone to the level of performance needed for a full-scale gravitational wave observatory.

Two trains, travelling at 15 and 30 kms per hour, head directly towards each other. They begin at a distance of 60 kms from each other. How far apart are they (in kms) one minute before they collide?
  • a)
    100 m
  • b)
    145 m
  • c)
     750 m
  • d)
    1075 m 
Correct answer is option 'C'. Can you explain this answer?

Jaspal Kaur answered  •  3 hours ago
The trains will be colliding after a time which is given by:
After this time of 80 minutes, train (1) has covered:

whereas, train (2) has covered

After 79 minutes, distance covered by the first train (Dl)

After 79 minutes, distance covered by the second train (D2)

So, the separation between the two trains:
= 60 - (D1 + D2)


Consider the following statements about the RBI’s Dollar-Rupee (USD/INR) swap auction:
1. This is being done in order to increase rupee liquidity in the market.
2. The tenor for swap is five years.
Which of the above statements is/are correct?
  • a)
    1 only
  • b)
    2 only
  • c)
    Both 1 and 2
  • d)
    Neither 1 nor 2 
Correct answer is option 'A'. Can you explain this answer?

Mamta Devi answered  •  3 hours ago
• Statements 2 is incorrect: The size of this auction is $5 billion and the tenor for swap is three years.
Dollar-Rupee (USD/INR) swap auction 
• The RBI has different tools through which it injects liquidity into financial markets. Adjusting repo rates and purchasing bonds by conducting open market operations (OMO) is a couple of tools which the RBI uses regularly either to increase or decrease the currency supply in the market.
• The recently announced ‘swap auction’ is one such tool. This is being done to increase the supply of rupees in the market. Technically, this activity is being termed as a USD/INR Buy/Sell Swap Auction.
• Through this auction, the RBI will buy US dollars from banks totaling to $5 billion. In turn the RBI will pay rupees to the participating banks at the current spot rate. At an average spot rate of 70 per dollar, the RBI will able to infuse about Rs 35,000 crore into the system through this auction process.
• Simultaneously, the banks will agree to buy-back the same amount of dollars from the RBI after three years — the tenor of this auction.
• The participating banks have to bid in the auction by quoting a forward premium in terms of paisa that they will pay to buy back the dollars.
• For example, if the spot exchange rate is 70 to a dollar, say Bank A quotes a premium of 150 paisa and bids for $25 million.
• So, the bank will get Rs 175 crore ($25 million multiplied by the exchange rate of 70). 
• After three years, the bank has to pay back approximately Rs179 crore ($25 million multiplied by the exchange rate of 71.5) to the RBI to buy back $25 million.
Why is it important?
• Indian financial markets have been undergoing liquidity problems since the IL&FS crisis emerged last year. The market is likely to see even tighter liquidity from a rush to pay advance tax as the financial year-end is less than a week away.
• For the RBI, the auction will help boost its forex reserves by another $5 billion. 
... more

Which region constituted the bone of contention between the Vijayanagar and Bahmani rulers?
  • a)
    Raichur doab
  • b)
    Tungabhadra doab
  • c)
    Krishna doab
  • d)
    Kaveri doab
Correct answer is option 'A'. Can you explain this answer?

Marvan answered  •  3 hours ago
The Raichur Doab was the bone of contention between the kingdoms of Vijaynagar and Bahmani. The Raichur Doab is a triangular region of land in the southern Indian states of Telangana and Karnataka lying between the Krishna River and its tributary, the Tungabhadra River.

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