Prevention of Corrosion

Q.

A dividend of 9% was declared on Rs 100 shares selling at a certain price. If the rate of return is 7 ½ %, calculate

i) The market value of the share.

ii) The amount to be invested to obtain an annual dividend of Rs 630.

1. Rs 120; Rs 8400

2. Rs 125; Rs 8500

3. Rs 122; Rs 8600

4. Rs 124; Rs 8200

Q. Statement 1: Rusting of iron can be prevented by forming a layer of a substance on it.
Statement 2: The layer prevents the metal from interacting with the atmosphere.

1. Both statements are true.
2. Both statements are false.
3. Only statement 1 is true.
4. Only statement 2 is true.

Q.

Rusting of iron can be prevented by which of the following methods?

1. Reacting with non-metal
2. Chrome plating
3. Galvanizing
4. All of the above

Q. Galvanisation refers to the process of __________ on a metal surface.

1. an alloy
2. a metal oxide
3. zinc
4. paint

Q.

Galvanizing works because __________.

1. Metal becomes inert.

2. Coating becomes inert.

3. The coating acts as a sacrifice coating, protecting the metal inside.

4. Galvanizing prevents rusting.

Q.

Sodium can be used for galvanizing.

1. True

2. False

Q.

Which of the following methods can be used for preventing corrosion?

1. Painting

2. Galvanising

3. Chrome plating

4. All of the given options are correct.

Q. Which of the following methods is not used in prevention of rusting of iron?

1. Galvanization
2. Greasing
3. Water wash
4. Painting

Q. Which of the following methods is not used for preventing iron from rusting?

1. Applying a coating of zinc
2. Applying grease
3. Applying water
4. Applying oil

Q. Molten is used for coating iron in galvanisation.

1. lead
2. zinc
3. copper
4. iron