Physical and Chemical Changes (CBSE (Central Board of Secondary Education- Board Exam) Class-7 Science): Questions 8 - 13 of 15

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Question number: 8

» Physical and Chemical Changes » Physical Changes » Introduction to Physical Changes

MCQ▾

Question

A change whereby only the physical properties of a substance undergo a change is called as:

Choices

Choice (4) Response

a.

Endothermic reaction

b.

Physical change

c.

Chemical change

d.

Exothermic reaction

Question number: 9

» Physical and Chemical Changes » Physical Changes » Introduction to Physical Changes

MCQ▾

Question

Examples of physical changes are:

Choices

Choice (4) Response

a.

Dissolution of sodium chloride

AND

Electric current on the filament of electric bulb and heater

b.

Stretching of rubber band

c.

Interchanging of three states of matter

d.

All a. , b. and c. are correct

Question number: 10

» Physical and Chemical Changes » Chemical Changes » Chemical Reactions and Its Examples

MCQ▾

Question

During a chemical change in addition to products following may be:

Choices

Choice (4) Response

a.

A change in smell and colour may takes place

AND

Heat, light or any other radiation may be given off or absorbed

b.

A gas is formed

c.

Sound may be produced

d.

All a. , b. and c. are correct

Question number: 11

» Physical and Chemical Changes » Chemical Changes » Chemical Reactions and Its Examples

MCQ▾

Question

Why cut fruits or vegetables turns drown when exposed to air:

Choices

Choice (4) Response

a.

Due to release of phenolic compounds

b.

Due to release of enzymes

c.

Both a. and b. are correct

d.

Question does not provide sufficient data or is vague

Question number: 12

» Physical and Chemical Changes » Chemical Changes » Rusting

MCQ▾

Question

The process of slowly eating away of a metal on exposure to air and moisture is called as:

Choices

Choice (4) Response

a.

Rusting

b.

Rust

c.

Crystallization

d.

None of the above

Question number: 13

» 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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