Which one of the following types of current is particularly dangerous because if

Question

Which one of the following types of current is particularly dangerous because if affects our nerves so as to prevent us from letting go of the source? When using pressurized water lo flush away water-soluble penetrate, the spray nozzle should be AC magnetization Reactive chemicals found in exhaust gases often cause corrosion. A piezoelectric material produces an electrical potential when it's The process of galvanizing entails coating surfaces with a layer of If a container label has four colour-coded diamonds with alphanumeric ratings, a 2 in the blue box indicates

Explanation / Answer

12) 110/120 volt AC(B)

13)Pointed directly on surface(A)

15) Oxygen concentration cells(D)-The solution in contact with the metal surface will normally contain dissolved oxygen. An oxygen cell can develop at any point where the oxygen in the air is not allowed to diffuse into the solution, thereby creating a difference in oxygen concentration between two points. Typical locations of oxygen concentration cells are under either metallic or nonmetallic deposits on the metal surface and under faying surfaces such as riveted lap joints. Oxygen cells can also develop under gaskets, wood, rubber, and other materials in contact with the metal surface. Corrosion will occur at the area of low oxygen concentration (anode). Alloys, such as stainless steel, which owe their corrosion resistance to surface passivity, are particularly susceptible to this type of crevice corrosion.

16) Distorted (c)-Piezoelectric Effect is the ability of certain materials to generate an electric charge in response to applied mechanical stress.

When piezoelectric material is placed under mechanical stress, a shifting of the positive and negative charge centers in the material takes place, which then results in an external electrical field. When reversed, an outer electrical field either stretches or compresses the piezoelectric material.

17) Galvanization, or galvanisation, is the process of applying a protective zinc coating to steel or iron, to prevent rusting. The most common method is hot-dip galvanization, in which parts are submerged in a bath of molten zinc. Galvanizing protects in two ways:

18) Moderete hazard(A)

Blue colour is for Health hzard

Types of Causes with different rating is given below-

Very short exposure could cause death or major residual injury (e.g. hydrogen cyanide, phosgene, methyl isocyanate, hydrofluoric acid)

Note- I do not have any idea about question 14....sorry for that

0 Poses no health hazard, no precautions necessary and would offer no hazard beyond that of ordinary combustible materials (e.g. wood, paper) 1 Exposure would cause irritation with only minor residual injury (e.g. acetone, sodium bromate) 2 Intense or continued but not chronic exposure could cause temporary incapacitation or possible residual injury (e.g. diethyl ether, ammonium phosphate) 3 Short exposure could cause serious, temporary or moderate residual injury (e.g. chlorine, liquid hydrogen, carbon monoxide) 4

Very short exposure could cause death or major residual injury (e.g. hydrogen cyanide, phosgene, methyl isocyanate, hydrofluoric acid)

Note- I do not have any idea about question 14....sorry for that

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