Basic Science Objective Questions

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Air Pollution

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<h1><strong>AIR POLLUTION</strong></h1> CONTENT <ol> <li>Definition of Air Pollution</li> <li>Air Polluntants</li> <li>Sources of Air Pollution</li> <li>Consequences of Air Pollution</li> <li>Control Measures of Air Pollution</li> </ol>   <h2><strong>Definition of Air Pollution </strong></h2> Air pollution is the discharge of harmful waste substances which contaminate the atmosphere. Air pollutants can be solids, liquids or gases. <p style="text-align: center;"><img class="size-full wp-image-19620 aligncenter" src="https://classhall.com/wp-content/uploads/2018/06/air-pollution.jpg" alt="air pollution" width="252" height="181" /><strong>Air Pollution</strong></p> Air pollution is a serious problem in many parts of the world. Smokestacks pump pollution into the air, harming the environment and making it harder to breathe.

Space Travel

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<h1><strong>SPACE TRAVEL </strong></h1> CONTENT <ol> <li>Meaning of Space Travel</li> <li>Purpose/Advantages of Space Travel</li> <li>Dangers of Space Travel</li> </ol> <p style="text-align: center;"><img class="size-full wp-image-36596 aligncenter" src="https://classhall.com/wp-content/uploads/2018/06/space-travel-Yuri-Gagarin.jpg" alt="Space Travel - Yuri Gagarin" width="218" height="194" /><strong>Yuri Gagarin</strong></p> <span style="color: #008000;">On April 12, 1961, the Russian cosmonaut Yuri Gagarin blasted into orbit. He was the first person in space and completed an orbit of the Earth before landing. This photograph was taken just before lift-off.</span> <h2><strong>Meaning of Space Travel</strong></h2> Space travel is traveling from the earth to outer space. Space is the environment surrounding the earth, moon and other planets. Human beings are able to go to space and spend days and months using a space rocket called space shuttle. Space travels are expensive to run. <p style="text-align: left;">On 21st July, 1969 Neil Armstrong an American was the first person to step on the moon. He was followed by Edwin Aldrin, also 2 other Americans, Eugene Cernan and Harrison Schmitt who stayed for about 74 hours and 59 minutes on the moon surface. <img class="size-full wp-image-36597 aligncenter" src="https://classhall.com/wp-content/uploads/2018/06/space-travel.jpg" alt="Space travel" width="303" height="215" /><strong>Space Travel</strong></p> <span style="color: #008000;">For hundreds of years, people dreamed about traveling to outer space. The invention of huge rockets made space travel a reality. An astronaut first went into space in 1961 (A Russian, Major Yuri Gagarin). Only eight years later, astronauts landed on the Moon. Since then, people have continued to explore space.</span> <p style="text-align: center;"><img class="size-full wp-image-36598 aligncenter" src="https://classhall.com/wp-content/uploads/2018/06/rocketing-to-space.jpg" alt="Space travel - Rocketing to space" width="297" height="306" /><strong>Rocketing to Space</strong></p>

Land or Soil Pollution

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<h1><strong>LAND/SOIL POLLUTION</strong></h1> CONTENT <ol> <li>Definition of Land or Soil Pollution</li> <li>Causes of Land/Soil pollution</li> <li>Effects of Land or Soil Pollution</li> <li>Control of Land/Soil Pollution</li> </ol>   <h2>Definition of Land or Soil Pollution<strong> </strong></h2> Land/soil pollution is the release of refuse and untreated wastes from agricultural and domestic activities and are exposed or dumped on the soil. <h2><strong>Causes of Land/Soil pollution</strong></h2> Causes of land/soil pollution are human activities that can release land/soil pollutants such as: (i) Agricultural activities which releases fertilizers, pesticides, herbicides and animal dung. (ii) Oil spills from refineries and industries. (iii) Illegal dumping of waste refuse and chemicals. (iv) Indiscriminate disposal of domestic waste products on the soil. <h2><strong>Effects of Land or Soil Pollution </strong></h2> Effects of land or soil pollution include the following:

Satellites

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<h1><strong>SATELLITES</strong></h1> CONTENT <ol> <li>Meaning of Satellite</li> <li>Types of Satellites</li> <li>Uses of Satellites</li> </ol>   <h2><strong>Meaning of Satellite </strong></h2> A satellite is a natural body that revolves round the earth or another planet. As we have learned earlier, the earth has one satellite which is the moon. Scientist have launched artificial satellites (like space shuttle, rockets etc) into space to carry out experiments, collect information and learn more about other space. <h2><strong>Types of Satellites</strong></h2> The types of satellites include the following: <ol> <li>Communications satellites</li> <li>Weather satellites</li> <li>Navigation satellites</li> <li>Surveillance satellites</li> <li>Scientific satellites</li> </ol> <img class="size-full wp-image-36602 aligncenter" src="https://classhall.com/wp-content/uploads/2018/06/communications-satellite.jpg" alt="Satellites - Types of Satellites - Communications Satellites" width="320" height="195" /> <h3><strong>Communications Satellites</strong></h3>

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