Physical and Chemical Changes-Rusting of Iron (CBSE Class-7 Science): Questions 1 - 6 of 6

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Question number: 1

» Physical and Chemical Changes » Rusting of Iron » Prevention of Rusting

MCQ▾

Question

Alloying is defined as:

Choices

Choice (4) Response
a.

Corrosion

b.

Transformation

c.

Way to prevent rusting

d. All of the above

Question number: 2

» Physical and Chemical Changes » Rusting of Iron » Rust Formation

MCQ▾

Question

The process of formation of rust is called as:

Choices

Choice (4) Response
a.

Rusting

b.

Crystallization

c.

Rust

d. None of the above

Question number: 3

» Physical and Chemical Changes » Rusting of Iron » Rust Formation

MCQ▾

Question

Rusting of iron requires:

Choices

Choice (4) Response
a.

Heat

b.

Air

c.

Moisture

d.

Moisture & Air

Question number: 4

» Physical and Chemical Changes » Rusting of Iron » Prevention of Rusting

MCQ▾

Question

The simplest way to prevent rusting is:

Choices

Choice (4) Response
a.

To apply coat of paint

b.

To apply a coat of grease

c. Both a. and b. are correct
d. Question does not provide sufficient data or is vague

Question number: 5

» Physical and Chemical Changes » Rusting of Iron » Crystallization

MCQ▾

Question

Crystallisation is defined as:

Choices

Choice (4) Response
a.

Crystallisation is better than evaporation

b.

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

c.

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

d. All a. , b. and c. are correct

Question number: 6

» Physical and Chemical Changes » Rusting of Iron » Galvanisation

MCQ▾

Question

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

Choices

Choice (4) Response
a.

Alloying

b.

Crystallization

c.

Galvanization

d. Question does not provide sufficient data or is vague

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