MCQs
Total Questions : 254
| Page 5 of 26 pages
Question 41. Recently, there has been a concern over the short supply of a group of elements called ‘rare Earth metals’. Why?
- China, which is the largest producer of these elements, has imposed some restrictions on their export.
- Other than China, Australia, Canada and Chile, these elements are not found in any country.
- Rare Earth metals are essential for the manufacture of various kinds of electronic items and these is a growing demand for these elements.
Answer: Option A. -> 1 and 3
Answer: (a)
Answer: (a)
Answer: Option A. -> Greenland
Answer: (a)
Answer: (a)
Answer: Option C. -> Armenia
Answer: (c)
Answer: (c)
Answer: Option B. -> China
Answer: (b)
Answer: (b)
Answer: Option D. -> 1, 2 and 3
Answer: (d)
Answer: (d)
Answer: Option A. -> Nitrate
Answer: (a)
Answer: (a)
Answer: Option D. -> Canada
Answer: (d)
Answer: (d)
Answer: Option D. -> Terrace cultivation
Answer: (d)
Terrace farming is a type of farming that was developed first by the Inca people. This method of farming uses “steps”, called Andenes that are built into the side of a mountain or hill.
On each anden, various crops are planted, and when it rains, instead of washing away all of the nutrients in the soil, the nutrients are carried down to the next level.
Additionally, these “steps” prevent a free-flowing avalanche of water that would take plants with it and destroy all of the crops on the hillside.
Answer: (d)
Terrace farming is a type of farming that was developed first by the Inca people. This method of farming uses “steps”, called Andenes that are built into the side of a mountain or hill.
On each anden, various crops are planted, and when it rains, instead of washing away all of the nutrients in the soil, the nutrients are carried down to the next level.
Additionally, these “steps” prevent a free-flowing avalanche of water that would take plants with it and destroy all of the crops on the hillside.
Answer: Option B. -> Second
Answer: (b)
Answer: (b)
Answer: Option B. -> potash
Answer: (b)
Tobacco is a crop that needs significant amounts of potassium. It is a fast-growing plant, between 80 and 150 days, with a high daily potassium requirement. Potash is the common name for various mined and manufactured salts that contain potassium in water-soluble form.
In some rare cases, potash can be formed with traces of organic materials such as plant remains, and this was the major historical source for it before the industrial era.
Answer: (b)
Tobacco is a crop that needs significant amounts of potassium. It is a fast-growing plant, between 80 and 150 days, with a high daily potassium requirement. Potash is the common name for various mined and manufactured salts that contain potassium in water-soluble form.
In some rare cases, potash can be formed with traces of organic materials such as plant remains, and this was the major historical source for it before the industrial era.
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