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GeographyMediumAsked in: NDA · NDA-II 2017, GAT

Which of the following statements about magnetite ore of iron is/are correct? 1. It is known as black ore. 2. It contains 60% to 70% of pure iron. 3. It possesses magnetic properties. Select the correct answer using the codes given below :

  1. A.1 only
  2. B.2 and 3 only
  3. C.1 and 3 only
  4. D.1, 2 and 3

Correct answer

D. 1, 2 and 3

Explanation

The correct answer is D, 1, 2 and 3. Magnetite is the black ore of iron, it is very rich in iron, and it is naturally magnetic.

Magnetite is an iron oxide (Fe₃O₄) and the finest iron ore, with an iron content of about 60 to 70 per cent, the highest among the common ores. Its dark colour gives it the name black ore, and its strong magnetic quality makes it especially valuable in the electrical industry. In India large deposits occur in Karnataka, including the Kudremukh area of the Western Ghats, and in parts of Andhra Pradesh, Tamil Nadu and Goa. Haematite, the red ore, is the most widely used ore in Indian industry; limonite (yellow or brown) and siderite are poorer ores.

A is wrong because statements 2 and 3 are also correct. B is wrong because it leaves out statement 1; magnetite is indeed called black ore. C is wrong because it leaves out statement 2; magnetite does contain about 60–70 per cent iron.

Exam tip: magnetite = black ore, magnetic, up to 70% iron; haematite = red ore, the most used in India.

Practice Questions

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Q2.GeographyAsked in: CDS · CDS-II 2017, GKMedium

Which of the following statements is/are correct? 1. Himalayan rivers have their origin in the snow-covered areas, hence are dry in winter season. 2. Rivers of the Peninsular Plateau have reached maturity. 3. Himalayan rivers depict all the three stages of normal cycle of erosion. Select the correct answer using the code given below.

  1. A.2 only
  2. B.1 and 3 only
  3. C.2 and 3 only
  4. D.1, 2 and 3
Show answer
Correct answer: C. 2 and 3 only

Himalayan rivers are perennial, so statement 1 is wrong, while statements 2 and 3 are correct. Himalayan rivers such as the Ganga, Indus and Brahmaputra rise from glaciers and snowfields and also get monsoon rain, so they flow all year round, including in winter.

Q3.GeographyAsked in: CDS · CDS-II 2017, GKMedium

Which of the following statements related to latitude are true? 1. Rainfall, temperature and vegetation vary with latitude. 2. The difference between the longest day and the shortest day increases with latitude. 3. Indira Point is located approximately at 6°45' N latitude. Select the correct answer using the code given below.

  1. A.1 and 2 only
  2. B.1 and 3 only
  3. C.2 and 3 only
  4. D.1, 2 and 3
Show answer
Correct answer: D. 1, 2 and 3

All three statements about latitude are true. Latitude decides how directly the Sun's rays strike a place, so temperature, rainfall and the type of vegetation change from the equator towards the poles, from hot, wet rainforests to cold tundra.

Q4.GeographyAsked in: CDS · CDS-II 2017, GKMedium

Which of the following lakes is/are situated in Ladakh? 1. Tso Kar 2. Pangong Tso 3. Tsomgo 4. Tso Moriri Select the correct answer using the code given below.

  1. A.1 only
  2. B.2 and 3
  3. C.1, 2 and 4
  4. D.2 and 4 only
Show answer
Correct answer: C. 1, 2 and 4

Tso Kar, Pangong Tso and Tso Moriri are high-altitude lakes of Ladakh, while Tsomgo lies in Sikkim. Pangong Tso, at about 4,350 metres, is a long, narrow lake that stretches from Ladakh into Tibet, and most of its length lies on the Chinese side.