Zusammenfassung der Ressource
Frage 1
Frage
In a car battery, plates of lead and lead dioxide are immersed in a liquid L. A chemical reaction occurs leading to the production of lead sulphate and water. The solution L is likely to be a/an [blank_start]Base.[blank_end]
Antworten
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Base.
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Distilled water
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Salt Solution
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Acid
Frage 2
Frage
Observe the food chain given below and choose the right option.
Frage 3
Frage
Petroleum and natural gas are found in layers deep within the surface of the earth. They are formed when layers of [blank_start]organic[blank_end] matter are subjected to intense heat and pressure. Natural gas requires [blank_start]higher[blank_end] amounts of heat and pressure to form than petroleum.
Antworten
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higher
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lower
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average
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chemical
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inorganic
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organic
Frage 4
Frage
After a harvest ,the fields are sometimes burned to clear them in preparation for the next season.
Choose any two statements which show the importance of doing this.
Antworten
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helping in the removal of plant matter
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making the soil softer and aerating it
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reducing the carry-over of certain pests
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preventing loss of soil by the action of wind
Frage 5
Frage
If we dip one end of a pencil or some other object into water at an angle to the surface, the submerged part looks [blank_start]bent[blank_end]. Its image is displaced because the light coming from the underwater portion of the object changes [blank_start]direction[blank_end] at it leaves the water. This bending of light as it passed from one transparent medium into another is called [blank_start]refraction[blank_end].
Refraction of light is caused by the difference in [blank_start]speed[blank_end] of light in different media.
Antworten
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bent
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direction
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refraction
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speed