Madhya Pradesh CM Shivraj Singh Chouhan tests covid positive

New Delhi, Jun 25: The Supreme Court on Thursday asked the Centre and the CBSE to issue fresh notification in connection with Class 12 exams, clarifying the option between internal assessment and exams later.

The observation from the top court after it was informed that the CBSE has decided to cancel the remaining board exams for Class 10 and Class 12.

A bench comprising Justices AM Khanwilkar, Dinesh Maheshwari and Sanjiv Khanna asked the Centre to clarify the issue of taking the option between internal assessment and exams later.

"Clarify the date of results," said the bench, noting that the CBSE will have to submit a fresh draft notification cancelling class 12 Board exams and affidavit on Friday morning, before the top court continues to hear the matter again at 10.30 a.m.

The apex court also sought clarity on the beginning of the new academic year.

It told Solicitor General Tushar Mehta, representing the Centre, that the CBSE is willing to conduct exams when the situation is conducive, but this may vary from state to state. "Will the decision be taken by a central authority or will the state government take the decision? How are you going to deal with that situation?"

Mehta replied that the decision must be taken according to the situation. To this, the bench said should not the solution be pan-India?

"You have not said when you will decide on this issue, and when you will take stock of these things. Some time frame will have to be given," noted the bench.

Continuing its queries, the bench said: "What about state regional board exams... the CBSE does not hold all the exams. The state Board is also there."

Mehta replied that the instructions from the controller of examinations are that exams are controlled centrally. "State boards assist the CBSE," he replied.

The bench observed that the government should modify the draft notification and include the state board issue. "Clear the stand that decision will be taken at the central level and not at the state level... other courses will have to be delayed till CBSE exam results come out," it said.

Mehta replied the assessment results will be published now, and if a student wants to opt to give the exam, then that will be conducted later. The top court asked Mehta to bring this on record and redraft the notification.

London, May 20: The current physical distancing guidelines of 6 feet may be insufficient to prevent COVID-19 transmission, according to a study which says a mild cough in low wind speeds can propel saliva droplets by as much as 18 feet.

Researchers, including those from the University of Nicosia in Cyprus, said a good baseline for studying the airborne transmission of viruses, like the one behind the COVID-19 pandemic, is a deeper understanding of how particles travel through the air when people cough.

In the study, published in the journal Physics of Fluids, they said even with a slight breeze of about four kilometres per hour (kph), saliva travels 18 feet in 5 seconds.

"The droplet cloud will affect both adults and children of different heights," said study co-author Dimitris Drikakis from the University of Nicosia.

According to the scientists, shorter adults and children could be at higher risk if they are located within the trajectory of the saliva droplets.

They said saliva is a complex fluid, which travels suspended in a bulk of surrounding air released by a cough, adding that many factors affect how saliva droplets travel in the air.

These factors, the study noted, include the size and number of droplets, how they interact with one another and the surrounding air as they disperse and evaporate, how heat and mass are transferred, and the humidity and temperature of the surrounding air.

In the study, the scientists created a computer simulation to examine the state of every saliva droplet moving through the air in front of a coughing person.

The model considered the effects of humidity, dispersion force, interactions of molecules of saliva and air, and how the droplets change from liquid to vapour and evaporate, along with a grid representing the space in front of a coughing person.

Each grid, the scientists said, holds information about variables like pressure, fluid velocity, temperature, droplet mass, and droplet position.

The study analysed the fates of nearly 1,008 simulated saliva droplets, and solved as many as 3.7 million equations.

"The purpose of the mathematical modelling and simulation is to take into account all the real coupling or interaction mechanisms that may take place between the main bulk fluid flow and the saliva droplets, and between the saliva droplets themselves," explained Talib Dbouk, another co-author of the study.

However, the researchers added that further studies are needed to determine the effect of ground surface temperature on the behaviour of saliva in air.

They also believe that indoor environments, especially ones with air conditioning, may significantly affect the particle movement through air.

This work is important since it concerns safety distance guidelines, and advances the understanding of the transmission of airborne diseases, Drikakis said.

New Delhi, Feb 28: The months of March, April and May are "likely to be warmer than normal" over northwest, west, central and parts of south India, the India Meteorological Department said today in its summer forecast.

Above normal heat wave conditions are also likely in the core heat wave (HW) zone during the season (March-May), the weather department said.

The core heat wave zone covers the states of Punjab, Himachal Pradesh, Delhi, Uttarakhand, Haryana, Rajasthan, Uttar Pradesh Gujarat, Madhya Pradesh, Bihar, Chhattisgarh, Jharkhand, West Bengal, Odisha and Telangana and parts of Maharashtra and coastal Andhra Pradesh.