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Generally the ionic compounds have high melting points.

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Lemon or tamarind is used for cleaning copper vessels turned greenish.

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Explain the term Gangue

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Explain the term Minerals

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Explain the term Ores

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Metallurgy Explain the terms.

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Identify the pairs of metals and their ores from the following.

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Make pairs of substances and their properties Substance. Property A. Potassium bromide. 1.Combustible

asked Oct 9, 2021 in Chapter 8: Metallurgy by Doubtly (98.9k points)

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Write names. a. Alloy of sodium with mercury. b. Molecular formula of the common ore of aluminum.

asked Oct 9, 2021 in Chapter 8: Metallurgy by Doubtly (98.9k points)

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Make a Power point presentation about the construction and use of binoculars.

asked Oct 9, 2021 in study by Doubtly (98.9k points)

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An object kept 60 cm from a lens gives a virtual image 20 cm in front of the lens.

asked Oct 9, 2021 in Chapter 7: Lenses by Doubtly (98.9k points)

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Three lenses having power 2, 2.5 and 1.7 D are kept touching in a row. What is the total power of the lens combination?

asked Oct 9, 2021 in Chapter 7: Lenses by Doubtly (98.9k points)

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5 cm high object is placed at a distance of 25 cm from a converging lens of focal length of 10 cm.

asked Oct 9, 2021 in Chapter 7: Lenses by Doubtly (98.9k points)

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Doctor has prescribed a lens having power +1.5 D. What will be the focal length of the lens? What is the type of the lens and what must be the defect of vision?

asked Oct 9, 2021 in Chapter 7: Lenses by Doubtly (98.9k points)

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What is the function of iris and the muscles connected to the lens in human eye?

asked Oct 9, 2021 in Chapter 7: Lenses by Doubtly (98.9k points)

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Distinguish between b. Concave lens and Convex Lens

asked Oct 9, 2021 in Chapter 7: Lenses by Doubtly (98.9k points)

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Distinguish between: a. Farsightedness and Nearsightedness

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Explain the working of an astronomical telescope using refraction of light.

asked Oct 9, 2021 in Chapter 7: Lenses by Doubtly (98.9k points)

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We can not clearly see an object kept at a distance less than 25 cm from the eye.

asked Oct 9, 2021 in Chapter 7: Lenses by Doubtly (98.9k points)

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One can sense colours only in bright light.

asked Oct 9, 2021 in Chapter 7: Lenses by Doubtly (98.9k points)

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