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The sky appears blue when viewed from Earth because of the scattering of light particles i.e. blue light gets refracted wherever there is the atmosphere. As there is no atmosphere in space, astronauts see the actual color of the sky is black.

Today, Carnovirus has created an atmosphere of fear in the whole world, and no treatment has been discovered so far, however, all countries are trying to find a cure for this virus.

How long has this virus been on Earth and how long have it been a very important question, till now it is difficult to tell from the investigation that how long it will remain on this earth. It is believed that the virus may end at a temperature of over 25 degrees, but it is still an estimate so far, there is no scientific evidence for it.

Coronavirus Outbreak : Covid -19

Coronavirus outbreak started in the city Wuhan,Hubei,China.It is said to be caused by SARS-CoV-2.Its sympotoms started to occur from 1st December 2019.The main cause of it is said to be  from animals such as pig, dogs ,turkey etc. As it is a zonotic which means transmitted between animals and humans.The corona virus cells are large in size around 400-500 micro.The virus is spreading faster in outside the country. As the cases of the people affected with coronavirus is increasing it has became a topic of concern for WHO. The major countries which are affected with the virus other than China are South Korea, Italy,Japan,Thailand and Iran.More than 10,000 case are reported outside China according to WHO.The Chinese govt initially locked down Wuhan - the epicenter of the virus outbreak. However it was too late. The virus has spread to all continents now, except Antarctica and it has already killed over 3000 globally.

What are its symptoms?

The common sign of infection are common flu,cough,difficulties in breathing etc may occure within 2-14 days of exposure to Acute Respiratory Syndrome(SARS-CoV), pnemonia and kidney failure in serious cases.

Prevention 

As currently vaccine to prevent coronavirus is still not made. So the best way to avoide being exposed to the virus are the habits which we can change in our daily life which include:

Try your best to avoid physical contact with sick people even if its commom flu or cough.
Wash your hands after using washroom, before and after eating or after coming home from outside.Practice resporatory hygiene make sure you, and the people around you, follow good respiratory hygiene. This means covering your mouth and nose with your bent elbow or tissue when you cough or sneeze. Then dispose of the used tissue immediately.

Dont touch your face,eyes or nose as our hands contain maximum number of germs.

Use hand sanitiser etc

Wah your hands with soap or handwash atleat for 20 seconds.

Treatment of Covid-19: Coronavirus

is no specific antiviral treatment recommended for COVID-19. People with COVID-19 should receive supportive care to help relieve symptoms. For severe cases, treatment should include care to support vital organ functions.
People who think they may have been exposed to COVID-19 should contact their healthcare provider immediately.

How has it affected the economy?

Worries are mounting that prolonged quarantines, supply chain disruptions and a sharp reduction in tourism and business travel could weaken the global economy or even cause a recession. Many leading businessare facing huge losses due to outbreak of the virus. 

Coronavirus in India

Thousands of suspected cases have been tested resulting in 29 confirmed coronavirus cases in India. Italians touring in India have been tested positive for Covid-19 coronavirus. They have been quarantined at the Chawla Camp in New Delhi.The latest coronavirus cases in India are reported from the Diamond Princess cruise ship quarantined off the coast of Yokohama in Japan. A total of 16 people from India have tested positive for the virus on the ship as of 26 February. The infected persons are reported to be a stable condition. A total of 132 passengers and six crew members from India are reportedly on board the ship.The government also temporarily suspended e-Visa facility for Chinese passport holders and noted that already issued e-Visas are temporarily invalid. Online application for a physical visa from China has also been suspended.

We havwe a rational number between -3 and -4.

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A rational number between (-3) and 

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A rational number between 

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Thus, the three rational number    are between (-3) and (-4).

Here is the solution

On 7th of October 2020, the announcement of the 2020 Nobel prize in chemistry was made by the secretary-general of the Royal Swedish Academy of Sciences and it was jointly awarded to Emmanuelle Charpentier, Ph.D., Max Planck unit for the science of pathogens and Jennifer A.Doudna, Ph.D., University of California, Berkeley. The prize was awarded "for the development of a method for genome editing". This also marked the first time that two women have been awarded a nobel prize in science.

The technique that they used is called CRISPR-Cas9 genome editing often referred to as "genetic scissors". Now, in order to find out the inner workings of life, researchers often need to modify genes in cells but this was not an easy thing to do as it used to be extremely time consuming and sometimes even impossible to achieve. But thanks to these "genetic scissors", it is now possible to get this done in the course of a few weeks. So let's try and get some idea about how it works!

CRISPR stands for clustered regularly interspaced short palindromic repeats and Cas9 is the CRISPR associated protein 9. This technique has been adapted from bacteria that use it as a defence mechanism against bacteriophage viruses. When an invading virus injects its DNA into a bacteria, it defends itself by splicing the strips of the virus DNA into its own DNA. The newly formed sequences are called CRISPRs. The bacteria then make RNA copies of this CRISPRs that with the help of Cas9 protein, recognise and cleave virus DNA in the event of a future invasion. 

In 2012, Charpentier and Doudna not only succeeded in recreating the bacteria's genetic scissors in a test tube but were also able to reprogram them. In their natural form, genetic scissors could only recognise virus DNA but Charpentier and Doudna proved that they could be controlled to cut any DNA molecule at any predetermined site. This tool has contributed to many discoveries in the field of basic research and some genetically modified crops have been grown that can withstand pests and drought. This came as a revolution in the field of life sciences and offers a potential tool to cure inherited diseases and much more.

https://champu.in

Downstream flow = 15kmph

Speed of the stream = 2.5 kmph

Therefore, Speed of the boat+ speed of water = 15 kmph

Here, Speed of boat = 15-2.5 = 12.5 kmph

Therefore, time taken  to row 75 km in still water = 75/12.5 = 6 hrs.

Speed of the boat = 14 kmph

Speed of water = 5 kmph

Downstream flow = speed of the boat+speed of water

Therefore, Downstream flow = 14=5 = 19 kmph

Hence, time taken  = 76/19 = 4 hrs.

Probability of getting a tail = 1/2

Probability of getting 6 = 1/6

Therefore, required probability = 1/2*1/6 = 1/12

Area of the circular garden = 1386 sq.m

From the formula of the area of circle we get the value of r= 21

Therefore, diameter = 21*2 = 42.

Average weight of 15 balls = 70 kg

Therefore, total weight of 15 balls = 70*15 = 1050 kg

Now, weight of the new steel ball be x kg

New average = 1050-12+x/15 = 70+2

Therefore, x = 1080 - 1032 = 42 kg

Lenght = 2b

Perimeter = 2(l=b) = 90

2 (2b=b) = 90

b=15 cm

Therefore, Area of the rectangle= 30*15 = 450 sq. cm

Length= 30 cm

New length = 30-5= 25 cm

New breadth = 15=5 = 20 cm

Therefore, new area = 25*20 = 500 sq. cm 

Hence increased area = (500-450) sq. com = 50 sq. cm

Let the length of each trai be x m

Relative speed = (66-56) kmph = 10 kmph = 10*5/18 mps = 25/9 mps

Now, Time = Distance/ Speed

54 = 2x?25*9 

x = 75 m

Average marks = 40*30 + 50*40 + 60*40/40+50+60 = 37.33

Christains = 65%

Adivasis = 50%

Let x% residents belong to both the communities.

Therefore, 100+x = 65+50

x = 15%

HCF * LCM = Product of 2 numbers

16*16320 = 816*x

x = 5440/17 = 320

Let the annual payment be Rs. x

Total debt = Rs. 5334

Amount = P(1+r/100)^t

(x/1+r/100) + (x/1+r/100^2) + (x/1+r/100^3) = 5334

x = 2401

Therefore, annual payment = x = Rs. 2401

Total Letters in PLASTIC = 7

Total vowels = 2 

Now, the letters will be = P,L,S,T,C, (IA) = 6 letters

Therefore, both the vowels taken together

Required number of ways = 6! 2! = 1440

Length:Breadth = 4:7

l = 4b/7

Areaa = 252 sq.m

lb = 252

l = 4*21/7 = 12

b = 252/l = 252/12 = 21

Perimeter = 2(l+b)

Perimeter = 2 (12+21) = 66 m

Let 1 unit be the total work.

Work done by Q = 1 - (1.5*4/9) = 1-2/3

Therefore, money made by Q for his part of work = 2430 *1/3 = Rs. 810