Description : Pick out the wrong statement about coating/electroplating of metals. (A) Phosphate coating is used as an excellent base for paints & enamels (B) Phosphate coating is less corrosion resistant than ... coating metal is made the anode (D) Calorising is the process of coating steel with chromium
Last Answer : (D) Calorising is the process of coating steel with chromium
Description : Sacrificial anode method is used in the protection of pipelines which are buried underground. Sacrificial anode (A) Occurs higher in the electro-chemical series of metals (B) Is exemplified by magnesium plate (C) ... cathodic base material to be guarded against corrosion (D) All (A), (B) & (C)
Last Answer : (D) All (A), (B) & (C)
Description : __________ is the process of coating the surface of steel with aluminium oxide, thereby imparting it increased resistance to corrosion & oxidation upto a temperature of 700°C. (A) Veneering (B) Galvanising (C) Electroplating (D) Calorising
Last Answer : (D) Calorising
Description : The metals with very low melting points which melts by the temperature of palm are A) Sodium and potassium B) Lead and magnesium C) Aluminium and zinc D) Gallium and caesium
Last Answer : D) Gallium and caesium
Description : Safety rods provided in nuclear reactors to guard against accidents, in case of earthquake are made of (A) High carbon steel (B) Molybdenum (C) Zircaloy (D) Boron or cadmium
Last Answer : (D) Boron or cadmium
Description : Which one of the following metals is immune to corrosion by air, water, hydrochloric acid and nitric acid; but is soluble in aqua regia? w) gold x) silver y) magnesium z) nickel
Last Answer : ANSWER: W -- GOLD
Description : Which one of the following metals pollutes the air of a city having large number of automobiles? A. Cadmium B. Chromium C. Lead D. Copper
Last Answer : ANSWER: C
Description : Which one of the following metals pollutes the air of a city having large number of automobiles? (1) Cadmium (2) Chromium (3) Lead (4) Copper
Last Answer : (3) Lead Explanation: The history of car pollution has been one of air and water contamination followed by regulated improvement. Cars and trucks cause a lot of air the pollution in the world ... . But since leaded gasoline has been phased out, lead emissions have decreased by about 98 percent.
Last Answer : Lead
Description : Which of the following is the lightest of engineering metals? (A) Magnesium (B) Aluminium (C) Titanium (D) Tin
Last Answer : (A) Magnesium
Description : White metal is an alloy of (A) Lead, tin and cadmium (B) Copper, tin and zinc (C) Copper and lead (D) None of these
Last Answer : (D) None of these
Description : With increase in impurities in metals, their corrosion resistances (A) Increase (B) Decrease (C) Remain same (D) May increase or decrease; depending on the type of metal
Last Answer : (B) Decrease
Description : In connection with corrosion of metals, passivation is the process that (A) Intensifies deterioration (B) Changes the composition of the metal (C) Inhibits further deterioration (D) None of these
Last Answer : (C) Inhibits further deterioration
Description : The bearing material that is most susceptible to corrosion is : Q. Babbit R. Copper-lead S. Aluminium T. Aluminium-babbit
Last Answer : Q. Babbit
Description : Galvanising (i.e., zinc coating) of steel sheets is done to (A) Prevent its rusting by contact with corrosive atmosphere (B) Protect the base metal by cathodic protection (C) Both (A) & (B) (D) Neither (A) nor (B)
Last Answer : (C) Both (A) & (B)
Description : Which metal does not undergo corrosion due to the formation of oxide layer? (1) Copper (2) Iron (3) Aluminium (4) Zinc
Last Answer : Aluminium
Description : The process of coating steel sheets by zinc to improve its corrosion resistance is called (A) Calorising (B) Galvanising (C) Zincification (D) Tempering
Last Answer : (B) Galvanising
Description : Wrought iron does not have (A) Uniform strength in all directions (B) Ability to hold protective coating (C) High ductility & corrosion resistance (D) Easily weldable characteristics
Last Answer : Option A
Description : Tin base and lead base alloys are used for bearing materials. Tin compared to lead has lower (A) Price (B) Corrosion resistance (C) Thermal conductivity (D) Abundant availability
Last Answer : (D) Abundant availability
Description : Most hazardous metal pollutant of automobile exhausts is (a) mercury (b) cadmium (c) lead (d) copper.
Last Answer : (c) lead
Description : There are thirteen metals which are treated as pollutants. Which of the following metals is not a pollutant? (A) Mercury (B) Arsenic (C) Aluminium (D) Lead
Last Answer : (C) Aluminium
Description : Which of the following metals is the most prone to work hardening? (A) Brass (B) Aluminium (C) Copper (D) Lead
Description : Magnalium is an alloy of-------? A. Magnesium and Lead B. Aluminium and Zinc C. Aluminium and Magnesium (Answer) D. Aluminium and Mercury
Last Answer : C. Aluminium and Magnesium (Answer)
Description : Which of the following is a moderating material used in nuclear reactor? (A) Graphite (B) Cadmium (C) Zircaloy (an alloy of zirconium and aluminium)
Last Answer : (A) Graphite
Description : Iron is prevented from rusting by coating with zinc. This process is called as – (1) Galvanisation (2) Corrosion (3) Sublimation (4) Reduction
Last Answer : (1) Galvanisation Explanation: Galvanization is the process of applying a protective zinc coating to steel or iron, in order to prevent rusting. The term is derived from the name of Italian scientist Luigi ... is hot-dip galvanization, in which steel parts are sub-merged in a bath of molten zinc.
Description : Iron is prevented from rusting by coating with zinc. This process is called as (1) Galvanisation (2) Corrosion (3) Sublimation (4) Reduction
Last Answer : Galvanisation
Description : Name and describe the method used for coating large and irregularly shaped articles for prevention of corrosion.
Last Answer : Metal spraying is the method used for coating large and irregularly shaped articles for prevention of corrosion. Diagram: Process:- In this method ,coating metal sprayed on the surface of ... . The molten metal then sprayed on the surface of base metal with the help of compressed air.
Description : Which of the following is the most abundant metal on Earth's crust? (1) Magnesium (2) Iron (3) Copper (4) Aluminium
Last Answer : (4) Aluminium Explanation: Aluminum is the most abundant metal in the Earth's crust, and the third most abundant element therein, after oxygen and silicon. It makes up about 8% by weight of the Earth's solid ... of Earth's volume Oxygen is 46.6%, Silicon 27.77%, Aluminum is 8.09% and iron is 5%.
Description : Although thermodynamically feasible, in practice, Magnesium metal is not used for the reduction of Alumina in the metallurgy of aluminium.Why?
Last Answer : Ans. : Below the temperature(1623 K) correspoinding to the point of intersection of Al 2O3 and MgO curves in Ellingham diagram, Magnesium can reduce Alumina because the ΔfG o value of Al2O3 at ... to Al. But Magnesium is much costier metal than Aluminium and hence the process will be uneconomical.
Description : Which metal is extracted from sea water? (1) Potassium (2) Magnesium (3) Aluminium (4) Beryllium
Last Answer : Magnesium
Description : Which of the following metals does NOT react with oxygen even at a high temperature? (1) Aluminium (2) Silver (3) Lead (4) line
Last Answer : (2) Silver Explanation: Silver and gold do not react with oxygen even at high temperatures as they are less reactive and are placed below the reactivity series.
Description : Absorption of calcium decreases if there is high concentration in the diet of (A) Copper (B) Sodium (C) Magnesium (D) Cadmium
Last Answer : Answer : C
Description : Metals are generally hard, which of the following metal is an exception and can be cut with a knife? a) iron b)sodium c)gold d)magnesium
Last Answer : b)sodium
Description : Muntz metal is a/an alloys of (A) Magnesium & tin (B) Ferrous material (C) Lead & tin (D) Copper & zinc
Last Answer : (D) Copper & zinc
Description : Stainless steel contains which of the following? (a) Aluminium and Zinc (b) Chromium and Carbon (c) Zinc and Mercury (d) Copper and Cadmium
Last Answer : Ans:(b)
Description : Which of the following materials is used for overhead transmission lines ? (a) Steel cored aluminium (b) Galvanised steel (c) Cadmium copper (d) Any of the above
Last Answer : (d) Any of the above
Description : Rohan had learnt that non-metals on beating with hammer are generally broken into pieces. Which of the following is a non-metal? a) iron nail b)aluminium wire c)copper wire d)piece of coal
Last Answer : d)piece of coal
Description : Generally __________ are subjected to galvanising (i.e., zinc coating). (A) Non-ferrous metals (B) Non-metals (C) Low carbon steels (D) Stainless steel
Last Answer : (C) Low carbon steels
Description : Sherardizing process is used for (A) Surface coating (B) Heat treatment of high speed steel (C) Cold working on metals (D) None of these
Last Answer : (A) Surface coating
Description : Tin coating on metals is not done by (A) Spraying (B) Powder metallurgy (C) Hot dipping (D) Electro-deposition
Last Answer : (B) Powder metallurgy
Description : Mercury is transported in metal containers made of (A) Aluminium (B) Iron (C) Lead (D) Nicke
Last Answer : (B) Iron
Description : Babbitt metal used for bearings is a _________base alloy. (A) Tin (B) Lead (C) Aluminium (D) Copper
Last Answer : (A) Tin
Description : Babbitt metal (used for making bearings) comprises of (A) Mainly tin (85%) and lead (B) Saw dust and iron dust mixture (C) Zinc and aluminium (D) Copper and aluminium
Last Answer : (A) Mainly tin (85%) and lead
Description : Mercury is transported in metal containers made of (A) Aluminium (B) Iron (C) Lead (D) Nickel
Description : Which one of the following metals does not react with water to produce Hydrogen? (1) Cadmium (2) Lithium (3) Potassium (4) Sodium
Last Answer : (1) Cadmium Explanation: A cadmium metal does not react with water to produce Hydrogen.
Description : Which one of the following metals does not react with water to produce Hydrogen ? (1) Potassium (2) Cadmium (3) Sodium (4) Lithium
Last Answer : (2) Cadmium Explanation: Cadmium is a soft, malleable, ductile, bluish-white divalent metal. It is similar in many respects to zinc but forms complex compounds. Unlike other metals, cadmium is ... occurs as a minor component in most zinc ores and therefore is a byproduct of zinc production.
Description : Which of the following metals causes Itai-Itai disease? (1) Cadmium (2) Chromium (3) Cobalt (4) Copper
Last Answer : (1) Cadmium Explanation: Itai-itai disease was the documented case of mass cadmium poisoning in Toyama Prefecture, Japan, starting around 1912. The cadmium poisoning caused softening of the bones and kidney ... damage. Itai-itai disease is known as one of the Four Big Pollution Diseases of Japan.
Description : Which of the following metals causes Itai-Itai disease ? (1) Cadmium (2) Chromium (3) Cobalt (4) Copper
Last Answer : Cadmium