Tag: study of kerala
Questions Related to study of kerala
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True
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False
Silver is found in nature both in native and combined state. Silver is less reactive than other metals. Native silver occurs as elongated dendritic coatings or irregular masses. It may occur alloyed with gold as electrum. It often occurs with silver sulfide and sulfosalt minerals.
The most abundant metal in the earth crust is:
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Copper
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Silver
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Aluminium
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Silicon
Aluminum is the most abundant metal in the earth's crust but it is never found free in nature. Silicon is not a metal.
Which statement is correct?
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Gangues are carefully chosen to combine with the slag present in the ore to produce easily fusible flux to carry away the impurities
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Slags are carefully chosen to combine with the flux present in the ore to produce easily fusible gangue to carry away the impurities
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Gangues are carefully chosen to combine with the flux present in the ore to produce easily fusible slag to carry away the impurities
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Fluxes are carefully chosen to combine with the gangue present in the ore to produce easily fusible slag to carry away the impurities
Silicon is the main constituent of _______.
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alloys
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rocks
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animals
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vegetables
Silicon is the most abundant element in the earth crust. It is found in rocks .
Removal of impurities from ore is known as:
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Crushing
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Concentration of ore
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Washing
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Grinding
The impurities present in the ore is known as gangue. The removal of impurities from the ore is known as concentartion of ore.
During the process of smelting, an additional substance is added which combines with impurities to form a fusible product in metal extraction. It is known as:
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Slag
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Mud
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Gangue
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Flux
Metallurgy is the process of:
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extracting metals from the ore
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roasting the ore
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extracting minerals from the ore
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adding carbon to the ore in blast furnace
The process of extraction, purification and refining of metals from ore is called metallurgy.
RCC is:
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the concrete having an iron framework inside it as a support
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the crushed cement in which more gravel is added
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prepared by adding calcium chloride to the limestone and calcium silicate
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none of the above
RCC is Reinforced concrete cement. It is a combination of concrete and steel to build a structure instead of using only concrete. Concrete is good in resisting compression and to gain resisting tension steel is added which has high tensile strength. To overcome the drawback of concrete, reinforced steel bars are used along with concrete.
The most abundant metal on the earth is:
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iron
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gold
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aluminium
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copper
Aluminium is the most abundant element in the earth's crust. It is most abundant in terms of quantity.
___________ metals occur free in nature.
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Alkali
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Noble
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Iron
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Aluminum
A noble metal is any metal that is found in its metallic form, either pure or alloyed, in nature. Over geological time scales, very few metals can resist natural weathering processes like oxidation, which is why generally only the less reactive metals such as gold and platinum are found as noble metals.