Sciencedoze: Science, Education and Technology

The  Global Positioning System  (GPS) is a satellite navigation system that provides precise location and time data in all weather conditions, anywhere on earth. For  GPS  to work there should be an unobstructed line of sight to 4 or more GPS satellites.  GPS  provides capabilities to military, civil, and commercial users around the globe. Components of a GPS   A GPS has three segments i.e space, control, and user segments as given below:   Space Segment (GPS Satellites):   This segment has 24 satellites deployed on six orbits around the earth at an altitude of 20,000 Km. These satellites revolve around the earth at intervals of 12 hours.   Control Segment (Ground Control Stations):   Ground control stations have 5 unmanned monitor stations and 1 Master control station which constantly monitor, control and maintain satellite orbits. Their work is to make sure that deviations of satellites from or...

Sun is a big power station that provides clean, non-stop energy for free. Sun is a ball of nuclear energy that has enough fuel onboard to run our solar system for another five billion years and solar panels can convert this energy into the infinite supply of electricity . Solar power may seem an advance technology, but it's already in use. Solar-powered quartz watch, calculator, car, aircraft, etc are already used in daily life. Also, NASA has developed a solar-powered plane whose upper wing surface is covered by solar panels that power the plane's engine. Topics covered in this article: How much energy Sun can provide us? What are Solar Cells ? How solar cells are manufactured and its working?  The efficiency of Solar Cells   Different types of photovoltaic solar cells How much power a solar cell can create? Why Solar cells are not popular in use? How much energy Sun can provide us? The amount of energy received from the sun is minimum at s...

What is a Nuclear Reactor A Nuclear reactor (also known as atomic pile), is a device used to initiate, terminate and control a nuclear chain reaction. It is based on the principle of controlled chain reaction and provides energy at a constant rate. Nuclear reactors are mainly used at the nuclear power plant for electricity generation . Energy (Heat) from nuclear fission is passed to a fluid, which turns into steam and runs a turbine to generate alternating current. Some nuclear reactors are also used for producing isotopes for medical and research purposes. Main Parts of Nuclear Reactor 1. Nuclear Fuel It is a material that can be fissioned by neutrons. The isotopes such as U-235 , Th-232 , and Pu-239 can be used in a reactor as a fuel. A certain amount of the fuel is taken in the form of rods, kept in aluminum containers. The rods which are separated by the moderator are placed in the core of the reactor. 2. Moderator During the fission of Uranium, fast...

Here are 10 Science riddles that will make you scratch your head. We bet you can't answer more than 5 Science riddles. So here we go!! Match your answers from below!! Questions  # Question 1 You have to pour Milk and Water in a barrel in such way that they should not mix. How will you do that?? # Question 2 You are given two identical metal balls in terms of diameter and mass. However, One is solid ball and another ball is hollow from inside. Can you distinguish between solid and hollow ball without knocking them?? # Question 3 If John killed Density X Volume then Who is John?? # Question 4 John was going to bleach his socks as they got muddy. He poured bleach in the washing machine and some spilled on the floor. He got a cleaning fluid and mopped the bleach on the floor. After some time, John was dead. Why?? # Question 5 Two man went into a bar. One man orders H2O and the other says, I will have H2O too. The second man dies. Why?? # Qu...

Global Times in a tweet reported that a person from the Yunnan Province in Southwest China died while on his way back to Shandong Province for work on a bus on Monday (March 23, 2020). He was reportedly tested positive for Hantavirus . The tweet further informed that the remaining 32 people on the bus were tested and the results are not immediately revealed. Don't Panic People are worrying that Hantavirus is like Coronavirus which is not true. Hantavirus is spread through rodent urine,feces or saliva. It is not airborne i.e it can't be transmitted through human to human contact. Centre for Disease Control and Prevention's website states, 'Rodent infestation in and around the home remains the primary risk for Hantavirus exposure. Even healthy individuals are at risk for HPS infection if exposed to the virus'. Symptoms of Hantavirus Symptoms of Hantavirus includes: Fever Headache Abdominal pain Dizziness Chills Muscle ache Naus...

On 20 march, 2020, WHO launched a messaging service with its partners WhatsApp and Facebook to keep people safe from COVID-19 virus. This easy-to-use chat service can to reach 2 to 3 billion people and enables WHO to provide information directly into the hands of the people that need it most. From government leaders to health workers and family and friends, this chat service will provide the latest news and information updates on COVID-19 virus, including details on symptoms and how people can protect themselves and others. It will also provide the latest situation reports and numbers in real time to help government decision-makers protect the health of their populations. The service can be accessed by a link [Given below] that opens a chat on WhatsApp. Users can simply type “hi” to activate the chat, prompting a menu of options that can help answer their questions about COVID-19 virus. Click here to join chat with WHO Demo screen

Lets all be alert as we will enter stage 3 of COVID-19 soon which is an outbreak of infection in community. COVID-19 Precautions for House-holds: 1. Wash milk bags the moment we take it & wash your hands while you are at it. 2. Consider cancelling newspapers and read e-newspaper. 3. Keep a separate tray for couriers. Courier person can place the envelope/package in the tray and courier may be left untouched for at least 24 hours. 4. Instruct maids not to touch main door. On entering the home, she has to immediately wash hands thoroughly, before touching other things . After that, wipe the calling-bell switch with a cleaning fluid. 3. Avoid getting Swiggy, Amazon, etc as far as possible. 4. Wash all fruits and vegetables with warm water once we bring them home. 5. Remote, phone and keyboards are the most highly contaminated elements in our house. Clean them at least once a day using cleaning fluid. 6. Wash hands frequently when in house or in office. Once e...

Disclaimer - This is written by taking reference from WHO official website . We appeal you not to believe in rumors and fake news, always verify facts from WHO official website. 1. COVID-19 virus can't survive in hot and humid climate From the evidence so far, COVID-19 can be transmitted in all areas including hot and humid areas. The best way to protect yourself is by cleaning hands frequently with soap or alcohol based hand wash.   2. Cold weather and snow can kill COVID-19 virus From the evidence so far, COVID-19 can survive in cold weather. Moreover, Virus can live freely in human body having temperature 36.5°C to 37°C irrespective of external temperature. The best way to protect yourself is by cleaning hands frequently with soap or alcohol based hand wash.   3. The COVID-19 virus can be transmitted by mosquito bites Till now no case is reported, COVID-19 virus primarily spread through droplets generated by infected person through sneezing or coug...

Globally 80,980 people are infected and 3,000 have died due to new coronavirus and some myths are traveling on the Internet which are fake. So, here are some myth busters: 1. Receiving packages from china is not safe This is false. Receiving packages from china is 100% safe as coronavirus cannot survive long on objects like letters, boxes, toys, etc. 2. Pets can spread coronavirus As of now, there is no such case reported but it is advisable to wash your hands after contact with animals/pets as bacteria like E. coli and Salmonella can pass between pets and humans. 3. Eating Garlic can prevent you from coronavirus Garlic is healthy food but there is no evidence till now that Garlic can protect you from new coronavirus. 4. Putting sesame oil will block coronavirus entering in the body This is not true. Sesame oil has little or no impact on coronavirus and it is very dangerous to put such things on skin. Some disinfectants can kill the COVID-19 only on the surface. T...

Qualifying in one of the most challenging and toughest engineering and medical entrance exams such as JEE and NEET is a dream cherished by millions of aspirants that aim to become an engineer or a doctor. And with a huge surge in the number of applicants every year, the competition has increased manifold making it a lot harder for applicants to reach their goal. Given below are some valuable tips that can help students to prepare well and in a limited time. All they need to do is adopt a focused and prepare in the right way. 1. Focus on Exam Pattern It is imperative for students to know the exam pattern to understand the specifies of the exam paper such as number of questions, type of questions, weightage, segregation of questions as per marks,important questions, etc. Knowledge of the exam formats helps understand the structure of the exam as they can begin by attempting the questions they are familiar with, thereby saving a lot of time for difficult ones. 2. Avoid...