Save Environment and Save Earth.

The environment is an ultimate important treasure we own. And we human beings have ended up treating it recklessly. According to the World Health Organization, 9 out of 10 people worldwide are exposed to levels of air pollutants that exceed safe levels. We all are well aware of the impact of air pollution on our health, but we give a blind eye to the coming trouble. Remember the days, especially around Diwali, when the Air index increases to ~500 – we suffocate and carve for a single breath of fresh air. We need to understand if the quality of air will keep on decreasing the way it has been decreasing, fresh air will become a luxury which will not be available to more than 90% of the living and coming generations. To create awareness about our environment, every year on 5th June, The World Environment Day is celebrated and this year’s theme is “Beat Air Pollution”. We, humans, have lasted a devastating impact on the world’s air, which has started taking its toll on us. Now that media and social experts have started highlighting our tragic impact on air and with people dying from toxic air pollution, people have actually started noticing the importance and are trying to make changes in their lifestyle to minimize the adverse effects on air and environment. Types of Air Pollution Household air pollution which occurs due to the burning of cow dung, wood, and other biomass-based fuels, leads to around 3.8 million premature deaths, mostly in developing countries like India. Industrial and transport pollution is responsible for thousands of premature deaths worldwide annually. Around 24 percent of greenhouse gas emission worldwide comes from agriculture, forestry, and other land-use. Waste burning and dumping also release harmful dioxins, methane, and black carbon into the atmosphere while volcanic outbreaks, dust storms, and other natural processes also contribute to global air pollution. 7 Tips to protect yourself from Unhealthy Air Here are some simple yet effective tips for protecting your family and you from the dangers of air pollution. While stepping out, check air pollution forecasts in your area. Avoid exercising outdoors when air pollution levels are high. Limit the amount of time you or your child spends playing outdoors if the air quality is bad. Always carry face mask which is also known as Anti-Pollution Mask with you. Try to use less electrical energy at home as generating electricity and various sources of energy creates air pollution. Avoid burning of wood and trash as it is one of the leading factors which cause air pollution. Avoid using personal vehicles for commuting. Use more of public transports or opt for carpool! Avoid the usage of air conditioners as they emit CFCs- Chlorofluorocarbons, which are the major reason for global warming and air pollution. We all as living beings have to understand that the environment is the most prominent thing; if we want to ensure better health and life to our coming generations. We all are not expected to do great things, but small changes in our lifestyle are enough to do our part. If we understand this and contribute our bit to the nature and environment, pollution and danger to the environment will become a thing of the past, and we will offer a better world to live in to our children.

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Communication Skills-

INTRODUCTION Communication: Communication is the concept of sharing/exchanging of information/idea by writing, speaking or any other medium. It is a two-way process. Communication skills are often used in organization/business, home or at workspace by using soft skills. It is a way to represent yourself in front of other parties efficiently and effectively. For example, After completion of your educational qualification, when you apply for a job, you need to communicate for sending an email. Communication is performed from Birth to Death in everyone's life. TYPES OF COMMUNICATION Communication can be categorised in three ways: (1) Verbal Communication (2) Non-Verbal Communication (3) Visual Communication 1. Verbal Communication: It is a method to communicate by using speech or words. It is a basic type of medium which is used in family, friends and relatives. Verbal communication has the requirement to learn a specific language which is understood by both parties. It ...

Question-About Frustum

Question=A metallic right circular cone 20 cm high and whose vertical angle is 60° is cut into two parts at the middle of its height by a plane, parallel to its base. If the frustum so obtained, be drawn into a wire of diameter1/16 cm, find the length of the wire. Solution=Let VAB be the solid metallic right circular cone of height 20 cm. Suppose, this cone is cut by a plane parallel to its base at a point O' such that V O^ prime =0^ prime 0,i i.e. O' is the mid-point of VO. Let r1and r2 be the radii of circular ends of the frustum ABB'A'. In right triangles VOA and VO'A', we have tan 30 deg = (OA)/(VO) and tan 30 deg = O^ prime A^ prime VO^ prime 1(sqrt(3)) = r 1 20 : and 1/(sqrt(3)) = r_{2}/10 r_{1} = 20/(sqrt(3)) * cmi and r_{2} = 10/(sqrt(3)) cm Volume of the frustum = 1/3 * pi(r_{1} ^ 2 + r_{2} ^ 2 + r_{1}*r_{2}) * h Volume of the frustum = pi/3 * (400/3 + 100/3 + 200/3) * 10c * m ^ 3 = 7000/9 * pi*c * m ^ 3 Let the length of the wire of 1/16cm di...

Reflection of Light-

REFLECTION OF LIGHT The phenomenon of bouncing off the light in the same medium, when it falls on a polished or shiny surface, is called reflection of light. Example: A mirror, polished surface of metal, etc., reflects (or bounces off) most of the light falling or incident on it, as shown in figure 1.2. Where, i = Incident angle, PO = Incident ray, MN= Plane mirror, ON = Normal, r = Angle of reflection, 0Q= Reflected ray, o = Incident point. Laws of Reflection of Light (a) Angle of incidence (i) is always equal to angle of reflection (r). angle i = angle r, and (b) Incident ray, reflected ray and normal to the mirror at the point of incidence all the three lie in the same plane. These two laws of reflection of light are applicable for all kind of mirrors such as spherical mirror, plane mirror, curved mirror.

CNG and Nano Carbon

1. The natural gas (CNG)-run buses are harmful for humans as they emit 'nano carbon' particles which can cause cancer, according to a study conducted by council of scientific and industrial research (CSIR). 2.Through the study was conducted on a very limited sample size in Delhi,CSIR took the findings seriously owing to the health hazard,it poses to humans and alerted the central government for further follow up,CSIR's Director General Dr MO Garg said. 3. According to him,the study can change the perception that natural gas is a clean fuel as it does not emit any visible smoke,which is in contrast to smoke emitted by diesel-run vehicles and perceived as harmful for humans. 4. "Natural gas is supposed to be a clean fuel when used in internal combustion engines,right? But,I don't think people realise that what you see (smoke) is perhaps better than what you don't see (no smoke from CNG vehicles)," said Garg during his address at the Global Green Energy Conc...

Light-

LIGHT Light is a kind of energy, which travels in the form of electromagnetic waves and produces sensation in our eyes. An object reflects light incident on it and this reflected light received by our eyes, makes us able to see the things around us. "In this way things are classified in two ways on the basis of reflection of light." (i) Luminous bodies: Those bodies which produce light, are called luminous bodies, e.g., electric bulb, sun, etc. (ii) Non-luminous bodies: Those bodies which cannot produce light, are called non-luminous bodies, e.g., book, chair, moon, etc. Non-luminous bodies when comes in contact of luminous bodies, becomes visible due to radiations incident on them. "On the basis of medium of propagation of light bodies are classified as follows:" (i) Opaque bodies: Those bodies which do not allow light to pass through them are called opaque bodies, e.g., wall, wood, book,...

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