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You must have seen or read the news of d...

You must have seen or read the news of dead fishes or oily water accumulating at the sea coasts. Why does this happen ?

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(i) This happens due to oil spills.
(ii) An oil spill is the release of a liquid petroleum hydrocarbon into the environment especially the marine ecosystem , due to human activity and is a form of pollution.
(iii) Oil spills may be due to release of crude oil from tankers , offshore platforms , drilling rigs and wells , as well as spills of refined petroleum product.
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Read the paragraph and answer the following question: You must be knowing about the high and low tides that occur regularly in the sea. The level of the sea water at any given location along sea shore increase and decreases twice a day at regular intervals. High and low tides occur at different times at places. The level of water in sea changes because of the gravitational force exerted by the moon. Water directly under the moon gets pulled towards the moon and the level of water there goes up causing high tide at that place. At two places on the earth at 90^(@) from the place of high tide, the level of water is minimum and low tides occur there. How many times the sea level at the coast change?

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Gravitational waves: Waves are created on the surface of water when we drop a stone into it. Similarly you must have seen the waves generated on a string when both its ends are held in hand and it is shaken. Light is also a type of wave called the electromagnetic wave. Gamma rays, X-rays, ultraviolet rays, infrared rays, microwave and radio waves are all different types of electromagnetic waves. Astronomical objects emit these waves and we receive them using our instruments. All our knowledge about the universe has been obtained through these waves. Gravitational waves are a very different type of waves. They have been called the waves on the fabric of space-time. Insteine predicted their existence in 1916. These waves are very weak and it is very difficult to detect them. Scientists have constructed extremely sensitive instruments to detect the gravitational waves emitted by astronomical sources. Among these, LIGO (Laser Interferometrc Gravitational Wave Observatory) is the prominent one. Exactly after hundred years of their prediction, scientists detected these waves coming from an astronomical source. Indian scientist have contributed significantly in this discovery. This discovery has opened a new path to obtain information about the Universe. What are the different types of electro magnetic waves?

Gravitational waves: Waves are created on the surface of water when we drop a stone into it. Similarly you must have seen the waves generated on a strintg when both its ends are held in hand and it is shaken. Light is also a type of wave called the electromagnetic wave. Gamma rays, X-rays, ultraviolet rays, infrared rays, microwave and radio waves are all different types of electromagnetic waves. Astronomical objects emit these waves and we receive them using our instruments. All our knowledge about the universe has been obtained through these waves. Gravitational waves are a very different type of waves. They have been called the waves on the fabric of space-time. Insteine predicted their existence in 1916. These waves are very weak and it is very difficult to detect them. Scientists have constructed extremely sensitive instruments to detect the gravitational waves emitted by astronomical sources. Among these, LIGO (Laser Interferometrc Gravitational Wave Observatory) is the prominent one. Exactly after hundred years of their prediction, scientists detected these waves coming from an astronomical source. Indian scientist have contributed significantly in this discovery. This discovery has opened a new path to obtain information about the Universe. What are the waves on the fabric of space time called?

Gravitational waves: Waves are created on the surface of water when we drop a stone into it. Similarly you must have seen the waves generated on a strintg when both its ends are held in hand and it is shaken. Light is also a type of wave called the electromagnetic wave. Gamma rays, X-rays, ultraviolet rays, infrared rays, microwave and radio waves are all different types of electromagnetic waves. Astronomical objects emit these waves and we receive them using our instruments. All our knowledge about the universe has been obtained through these waves. Gravitational waves are a very different type of waves. They have been called the waves on the fabric of space-time. Insteine predicted their existence in 1916. These waves are very weak and it is very difficult to detect them. Scientists have constructed extremely sensitive instruments to detect the gravitational waves emitted by astronomical sources. Among these, LIGO (Laser Interferometrc Gravitational Wave Observatory) is the prominent one. Exactly after hundred years of their prediction, scientists detected these waves coming from an astronomical source. Indian scientist have contributed significantly in this discovery. This discovery has opened a new path to obtain information about the Universe. Is it easy to detect Gravitational waves?

CHETAN PUBLICATION-INTRODUCTION TO MICROBIOLOGY -Answer the following :
  1. Which type of cheese is used in western food like pizza , burger , san...

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  2. What do you mean by antibiotic ?

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  3. Which precautions should be taken about their consumption ?

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  4. Observe the garbage vans of grampanchayat and municipality . Nowaday, ...

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  5. You must have seen or read the news of dead fishes or oily water accum...

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  6. Explain the importance of biopesticides in organic farming.

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  7. Which are the reasons for increasing the popularity of probiotic produ...

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  8. How the bread and other products produced using baker's yeast are nutr...

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  9. Which different microbes are useful to us ?

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  10. Which different products can be produced with the help of microbes ?

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  11. We use the fermentation process while conversion of milk into Yoghurt ...

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  12. How does the bread become spongy ? OR How is bread produced ?

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  13. Explain the production of cheese .

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  14. Explain the role of microbes in farming .

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  15. Which precaution are necessary for proper decomposition of domestic wa...

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  16. What are the benefits of mixing ethanol with petrol and diesel ?

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  17. How can the oil spills of rivers and oceans be cleaned ?

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  18. What are the different types of cheese ?

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  19. Why it is necessary to ban the use of plastic bags ?

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  20. How can the soil polluted by acid rain be made fertile again ?

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