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Correct Answer: D) Mixing Copper with Zinc.
Correct Answer: A) Phosphate.
Correct Answer: A) Cottage industry.
Correct Answer: A) The Ruhr Valley.
Correct Answer: D) Assam.
Correct Answer: C) Texture.
Correct Answer: B) Kalpakkam.
Correct Answer: A) Jewellery.
Correct Answer: A) Mumbai-high.
Correct Answer: D) 1000 years.
Correct Answer: C) Manganese.
Correct Answer: B) Jharia.
Correct Answer: D) All of the above.
Correct Answer: D) Mixing Copper with Tin.
Correct Answer: A) Petrol.
Correct Answer: C) Placer deposits.
Correct Answer: A) Minerals that contain Iron.
Correct Answer: C) 3.
Correct Answer: A) Black Gold.
Correct Answer: D) Aluminum.
Correct Answer: A) Mixing Copper with Iron and Nickel.
Correct Answer: C) PETROLEUM.
Correct Answer: A) NOCIL.
Correct Answer: D) Hajira-Vijaypur-Jagdishpur.
Correct Answer: A) Geologists.