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Why the sky appears blue? 29, Jan-2020

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.

How long does the coronavirus last on Earth? 18, Mar-2020

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.


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.

Find three rational numbers between -6 and -5 02, Oct-2020

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

                                =  space space space space fraction numerator left parenthesis negative 3 right parenthesis plus left parenthesis negative 4 right parenthesis over denominator 2 end fraction space equals space fraction numerator negative 7 over denominator 2 end fraction

A rational number between (-3) and space space fraction numerator negative 7 over denominator 2 end fraction

                                 = space space space open square brackets open parentheses negative 3 close parentheses plus open parentheses fraction numerator negative 7 over denominator 2 end fraction close parentheses close square brackets plus 2

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                                 =  space space space space space space fraction numerator negative 13 over denominator 2 end fraction cross times 1 half space equals space fraction numerator negative 13 over denominator 4 end fraction

A rational number between space space open parentheses fraction numerator negative 7 over denominator 2 end fraction close parentheses space and space left parenthesis negative 4 right parenthesis

                                     = space space space open square brackets fraction numerator negative 7 over denominator 2 end fraction plus left parenthesis negative 4 right parenthesis close square brackets space plus 2

                                     =  space space space space open square brackets fraction numerator negative 7 plus open parentheses negative 8 close parentheses over denominator 2 end fraction close square brackets plus 2

                                     =     space space space fraction numerator negative 15 over denominator 2 end fraction cross times 1 half space equals space fraction numerator negative 15 over denominator 4 end fraction

Thus, the three rational number  space space open parentheses fraction numerator negative 72 minus over denominator 2 end fraction close parentheses comma space open parentheses fraction numerator negative 13 over denominator 4 end fraction close parentheses space and space open parentheses fraction numerator negative 15 over denominator 4 end fraction close parentheses  are between (-3) and (-4).


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.

A man can row along the flow at 15 kmph and the speed of the flow is 2.5 kmph. How long would it take him to row 75 km in still water? 24, Dec-2020

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.

The speed of the boat is 14 kmph in still water. If the speed of the stream is 5 kmph, then how long does it take for the boat to go 76 km downstream? 24, Dec-2020

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.


A coin is tossed and 6 sided dire is rolled. Find the probability of getting a tail of coin and a 6 on dice? 24, Dec-2020

Probability of getting a tail = 1/2

Probability of getting 6 = 1/6

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

The area of a circular garden is 1386 sq.m. How much distance will have to be covered if we need to cross the garden along its diameter? 24, Dec-2020

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.

The average weight of 15 steel balls is 70 kg. The average weight is increased by 2 kg when a steel ball weighing 12 kg is replaced by another, what is the weight of the new steel ball? 24, Dec-2020

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

The length of a rectangle is twice that of its breadth. The perimeter of a given rectangle is 90 cm. If the length decreased by 5 cm and breadth increased by 5 cm, then the area of the rectangle increased by how much (in sq. cm)? 25, Dec-2020

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

If 2 trains of equal length are running on parallel lines in the same directions at 66 km/hr and 56 km/hr. The faster train passes the slower train in 54 sec, then what will be the length (in m) of each train? 25, Dec-2020

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


For 2 numbers the LCM and HCF are 16320 and 16 respectively. If one of them is 816, then find the other one. 25, Dec-2020

HCF * LCM = Product of 2 numbers

16*16320 = 816*x

x = 5440/17 = 320


What annual payment will discharge a debt of Rs. 5334 due in 3 years at 16 2/3 pa compound interest? 26, Dec-2020

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

In how many different ways can the letters of the word PLASTIC be arranged in such a way that the vowel always come together? 26, Dec-2020

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

The length and breadth of a rectangle are in the ratio 4:7. The area of the rectangle is 252 sq.m. Find the perimeter of the rectangle. 26, Dec-2020

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


P,Q,R enters into a contract fo a piece of work for Rs. 2430. P & R together are supposed to do 1.5 times of the 4/9th of the total work. How much does Q get? 26, Dec-2020

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


Apple $US 1 trillion Company - Apple reaches $1 trillion value

On thursday 2, August 2018 Apple just become the first American public company to cross $ 1 trillion in value.

The founder of apple Steve Jobs who died in Palo Alto on October 5, 2011 had a vision to be the world richest company.


A thin line between Success and Failure

Ouccess in broader terms is doing difficult task frequently. You cannot be an achiever in the first attempt. Anything easily achieved cannot be a success in real terms because it may or may not be perennial.

Success is achieved on the basis of piles of milestones, sweat, efforts and with self-discipline of an individual. And this is built partially in a daunting professional atmosphere. We live in the world where our work is judged in the blink of eyes to be a success or a failure.

Blogs on Education and Facts

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