Question : The oceanic crust mainly consists of _____ and _____.
Option 1: silica, alumina
Option 2: silica, magnesium
Option 3: magnesium, alumina
Option 4: iron, alumina
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Correct Answer: silica, magnesium
Solution : The correct option is silica, magnesium.
The term "SiMa" refers to the composition of the upper layer of the Earth's mantle and the overlying oceanic crust. "Si" stands for silicon and "Ma" stands for magnesium. The SiMa layer is characterised by a higher concentration of magnesium and lower concentrations of silicon compared to the continental crust.
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Question : The main mineral constituents of the continental mass are ____ and ____.
Option 1: silica, magnesium
Option 2: silica, alumina
Option 3: oxygen, carbon
Option 4: alumina, magnesium
Question : The mineral constituent of chlorophyll is
Option 1: Iron
Option 2: Magnesium
Option 3: Calcium
Option 4: Potassium
Question : The element that is not found in the blood is:
Option 1: copper
Option 2: chromium
Option 3: magnesium
Option 4: iron
Question : Galvanisation is the
Option 1: deposition of zinc on iron
Option 2: deposition of tin on iron
Option 3: deposition of copper on iron
Option 4: deposition of aluminium on iron
Question : Find the weight of a cylindrical iron container with a base of radius 12.6 cm and height is 4 m, where the weight of 1 cm2 of iron is 2 grams.
Option 1: 299.284 kg
Option 2: 199.584 kg
Option 3: 399.168 kg
Option 4: 499.482 kg
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