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प्रश्न
Draw a diagram to explain the idea of Internet.
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उत्तर
Glossary to understand the diagram:
- Satellite: A satellite is a wireless receiver or transmitter that is launched by a rocket and placed in orbit around the earth.
- Downlink: The communication going from a satellite to the ground is called a downlink.
- Uplink: The communication going from the ground to a satellite is called uplink.
संबंधित प्रश्न
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Bassanio borrowed money from Shylock in Antonio’s name.
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Tom lay thinking. Presently it occurred to him that he wished he was sick; then he could stay home from school. He examined himself. He found no symptoms or sickness, and he investigated again. This time he felt he had a stomach ache, but it soon grew feeble, and presently died wholly away. He reflected further.
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Read the following passage carefully and answer the following questions.
Pollution is the introduction of contaminants into the environment that cause harm to the ecosystem. The different kinds of pollution are air pollution, water pollution and land pollution. The release of various gases, finely divided solid particles, or liquid droplets that escape into the atmosphere to disperse and dilute in the environment is called air pollution. Modern society is also concerned about specific types of pollutants, such as noise pollution, light pollution, and plastic pollution.
Particulate Matter (PM), also known as particle pollution, is a complex mixture of extremely small particles and liquid droplets that get into the air. These particles if inhaled can affect health. The impact of PM 2.5 is particularly high in South Asia. Outdoor pollution is caused by a variety of pollutants like public and private vehicles, waste burning in the open, power production industries and construction and even cigarette smoking in public places.
Presently, air pollution is a major and growing risk factor for ill health in India. Delhi is one of the most air polluted cities in India. The air in the city as well as areas surrounding it has worsened to extremely hazardous levels in the recent years. This year’s pollution level is the worst in four years. Several studies have shown that poor air quality is a cause for many health issues among people with lower respiratory disorders with symptoms like dry cough, breathlessness, wheezing, chest discomfort, serious lung infections and cardio vascular diseases. Some studies throw light on the fact that about 16 per cent of the deaths worldwide in 2015 were due to pollution.
Air Masks are an option to protect oneself outdoor. Air masks can be used while commuting or while one is exposed to a polluted area. Some of these masks also include a layer of Activated carbon to filter the air. They protect us from suspended air particles and particulate matter up to the size of 2.5 microns and above. Their usage is limited to some days and should be disposed off after their prescribed duration of usage. The price for air masks starts from Rs 100 and can go up to Rs 500 and more.
We have to take active measures to control pollution and protect ourselves to lead a healthy and pollution free life.
- What is meant by pollution? Mention the different kinds of pollution.
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- Identify three major causes of pollution in air
- Name the types of pollution we encounter now.
- What sort of health issues do people face due to air pollution?
- How can we protect ourselves outdoor from air pollution?
- Suggest a suitable title to the passage.
- Identify the meaning of the word similar to the one used in the fourth para:
- emerging
- filtering
- floating
- falling
