Description : In cheese manufacture, the microorganisms are important for (a) the ripening only (b) the souring of milk only (c) the development of resistance to spoilage only (d) both the souring and the ripening processes
Last Answer : (d) both the souring and the ripening processes.
Description : Which of the following causes the rusting of iron? a. Oxidation b. Reduction c. Chemical reaction with oxygen d. Chemical reaction with CO2 (1) a and b (2) b and c (3) c and d (4) a and c
Last Answer : a and c
Description : The rusting of iron is a/an - (1) physical change (2) electrochemical change (3) electrical change (4) None of the above
Last Answer : (2) electrochemical change Explanation: When iron is exposed to air and moisture, its surface gradually corroded and converted into a brown mass. The rusting of iron is due to the formation of hydrated ion. Rusting is an electro-chemical process.
Description : The rusting of iron is a/an (1) physical change (2) electrochemical change (3) electrical change (4) None of the above
Last Answer : electrochemical change
Description : Is A car fender rusting a physical or chemical change?
Last Answer : Uhh definitely a chemical
Description : Is a rusting paper clip a physical or chemical change?
Last Answer : yes
Description : What is the operating point in the Magnetising characteristic of protection CT & measuring CT?
Last Answer : Protection CT – Operation at ankle point only. Measuring CT – Operation from ankle to knee point
Description : Magnetising steel is normals difficult because (a) it corrodes easily (6) it has high permeability (c) it has high specific gravity (d) it has low permeability
Last Answer : (d) it has low permeability
Description : 40 No load test on a transformer is carried out to find A. Copper loss B. magnetising current C. Magnetising current and loss D. Efficiency of the transformer
Last Answer : C. Magnetising current and loss
Description : 22 No load test on a transformer is carried out to find A. copper loss B. magnetising current C. Magnetising current and no load loss D. Efficiency of the transformer
Last Answer : C. Magnetising current and no load loss
Last Answer : Magnetising steel is normals difficult because it has low permeability.
Last Answer : The magnetising current of a transformer is usually small because it has small air gap.
Description : Alloy steel containing chromium to resist rusting is known as (a) wrought iron (b) cast iron (c) hard steel (d) stainless steel
Last Answer : Ans:(d)
Description : Alloy steel containing chromium, to resist rusting, is known as (a) Wrought iron (b) Cast iron (c) Hard steel (d) Stainless steel
Description : What are the methods of preventing rusting of iron?
Last Answer : Iron articles can be coated with zinc or chromium. By painting the iron articles. By heating and dipping in molten coal tar.
Description : Rusting of Iron involves--------? A. Reduction B. Oxidation (Answer) C. Decomposition D. Displacement
Last Answer : B. Oxidation (Answer)
Description : Rusting of iron and respiration: (a) both are exothermic processes (b) both are endothermic processed (c) rusting is exothermic, respiration is endothermic (d) rusting is endothermic, respiration is exothermic
Last Answer : (a) both are exothermic processes
Description : What is meant by ‘rusting’? With labelled diagrams, describe an activity to find out the conditions under which iron rusts. -Chemistry
Last Answer : When iron is exposed to air and moisture for a very long time, it gets covered with a brown flaky substance. This brown flaky substance is called rust and the process is called rusting. The ... when only oxygen was available, it shows that rusting cannot take place if only oxygen is available.
Description : Explain why rusting of iron objects is faster in coastal areas than in deserts. -Science-7
Last Answer : As content of moisture in the air in coastal areas is higher than in the air in deserts. So, the process of rusting is faster in coastal areas.
Description : Explain how painting of an iron gate prevents it from rusting? -Science-7
Last Answer : The presence of oxygen and moisture is essential for rusting to occur. Painting prevents the iron gate from coming in contact with oxygen and moisture, hence prevents rusting.
Description : Two methods by which rusting of iron can be prevented are __________ and __________ -Science-7
Last Answer : painting or greasing, galvanisation
Description : What does the rusting of iron nail? -Do You Know?
Last Answer : answer:
Description : Wrought iron is resistant to rusting and corrosion due to the presence of
Last Answer : Wrought iron is resistant to rusting and corrosion due to the presence of A. Cementite `(Fe_(3)C)` B. ... 4)` Slages D. `MnSiO_(3)& FePO_(4)`slages
Description : How rusting of iron is quicker in saline water?
Last Answer : Need answer
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 : Rusting of iron takes place due to – (1) oxidation (2) carbonation (3) exfoliation (4) corrosion
Last Answer : (1) oxidation Explanation: The rusting of iron is an electrochemical process that begins with the transfer of electrons from iron to oxygen. The rate of corrosion is affected by water and accelerated by ... iron is in contact with water, oxygen, or other strong oxidants, or acids, it rusts.
Description : The metal, used to galvanise iron to protect it from rusting is - (1) Zine (2) Chromium (3) Lead (4) Antimony
Last Answer : (1) Zine Explanation: Galvanization is the process of applying a protective zinc coating to steel or iron, in order to prevent rusting. Although galvanization can be done with electrochemical and electro- ... is hot-dip galvanization, in which steel parts are submerged in a bath of molten zinc.
Description : Due to rusting the weight of iron - (1) Decreases (2) Increases (3) Remains the same (4) Uncertain
Last Answer : (2) Increases Explanation: Corrosion of a block of metal - Iron to Iron Oxide (rust), Aluminum to Bauxite, Cooper to Cupric-oxide, or otherwise - does not change the weight of the metal in the system.
Description : The method of protecting iron from rusting, by coating a thin layer of Zinc is called - (1) Galvanizing (2) rancidity (3) Alloy (4) Pulverizing
Last Answer : (1) Galvanizing Explanation: Galvanisation or galvanization (or galvanizing as it is most commonly called) is the process of applying a protective zinc coating to iron or steel, to prevent rusting.
Description : Which of the following is not favourable to prevent iron from rusting?
Last Answer : Annealing
Description : The rusting of iron
Last Answer : Increases its weight
Description : Which of the following is required for the rusting of iron?
Last Answer : oxygen and water
Description : The rusting of iron metal in air needs both–
Last Answer : Oxygen and Moisture
Description : Rusting of Iron is –
Last Answer : Due to oxidation
Description : Rusting of iron is an example of which thing?
Last Answer : Slow oxidation
Description : What does the rusting of iron nail?
Description : Galvanised iron is (A) Harder (B) Protected from rusting (C) Alumina coated iron (D) None of these
Last Answer : (B) Protected from rusting
Description : Pick out the correct statement. (A) Stainless steel is nothing but chromium coated steel (B) Hardening of a soft metal can be done by alloying it with another metal or non-metal (C) ... its temporary distortion under the action of applied stress (D) Rusting of iron is not electrochemical in nature
Last Answer : (B) Hardening of a soft metal can be done by alloying it with another metal or non-metal
Description : Rusting of iron is quicker in saline water than in ordinary water. Why is it so ?
Last Answer : Ans. In saline water, NaCl helps water to dissociate into H+ and OH– . Greater the number of H+ , quicker will be rusting of Iron.
Description : Wrought iron is not (A) Ductile & resistant to corrosion/rusting (B) Weldable easily (C) Having uniform strength in all directions (D) Having maximum tensile strength along the lines of slag distribution
Last Answer : Option C
Description : The rusting of iron metal in air needs both
Description : Assertion A : Paints with white lead base are not recommended for painting of iron works. Reason R : Paints with white lead base do not check rusting of iron. Select your answer according to the coding system given below: ... of A (C) A is true but R is false (D) A is false but R is true
Last Answer : Answer: Option A
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 : The metal, used to galvanise iron to protect it from rusting is (1) Zinc (2) Chromium (3) Lead (4) Antimony
Last Answer : Zinc
Description : Rusting of iron takes place due to (1) oxidation (2) carbonation (3) exfoliation (4) corrosion
Last Answer : oxidation
Description : The saliva pH is approximately 6.8. It is thus a slightly acid pH. Saliva lubricates the food bolus and initiates the enzymatic extracellular digestion of food. It also works as a buffer for the ... 's milk and in the mucosae of the intestine and airways) that protect the organism against pathogens.
Last Answer : What is the salivary digestive enzyme? Which type of food does it digest and into which smaller molecules does it transform the food?
Description : Is clipping your finger nails a chemical change?
Description : Is a rusting bicycle a chemical or physical?
Last Answer : Rust (oxidation of metal) is a chemical change but it is also aphysical change in the strength of the material.
Description : Which one of the following is an example of chemical weathering? w) the splitting of a boulder x) the grinding of pebbles into sand y) the cleavage of a feldspar crystal z) the rusting of hornblende
Last Answer : ANSWER: Z -- THE RUSTING OF HORNBLENDE