NCERT Class 7 Science-Physical and Chemical Changes[Rusting of Iron] [NCERT Based General Studies (GS)]: Questions 1 - 6 of 6

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Question 1

Question MCQ▾

Alloying is defined as:

Choices

Choice (4)Response

a.

Transformation

b.

Way to prevent rusting

c.

Corrosion

d.

Question does not provide sufficient data or is vague

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Question 2

Question MCQ▾

The process of formation of rust is called as:

Choices

Choice (4)Response

a.

Rust

b.

Rusting

c.

Crystallization

d.

All of the above

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Question 3

Question MCQ▾

Rusting of iron requires:

Choices

Choice (4)Response

a.

Air

b.

Heat

c.

Moisture

d.

Moisture & Air

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Question 4

Question MCQ▾

The simplest way to prevent rusting is:

Choices

Choice (4)Response

a.

To apply a coat of grease

b.

To apply coat of paint

c.

Both a. and b. are correct

d.

Question does not provide sufficient data or is vague

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Question 5

Question MCQ▾

Crystallisation is defined as:

Choices

Choice (4)Response

a.

Crystallisation separates a pure solid in the form of its crystals from a solution

b.

Crystallisation is better than evaporation

c.

Process of obtaining large crystals of pure substance from a concentrated solution

d.

All a., b. and c. are correct

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Question 6

Question MCQ▾

The process in which a layer of zinc or chromium is deposited over the iron sheets is called as:

Choices

Choice (4)Response

a.

Crystallization

b.

Galvanization

c.

Alloying

d.

None of the above

Edit