CBSE Class-7 Science: Questions 90 - 95 of 322

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Question number: 90

» 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: 91

» Nutrition in Animals » Digestion in Human Beings » Human Digestive System and Its Organs

MCQ▾

Question

Digestive system consists of:

Choices

Choice (4) Response

a.

Digestive tract and associated glands

b.

Digestive glands

c.

Digestive tract

d.

Alimentary canal

Question number: 92

» Heat » Transfer of Heat » Convection

MCQ▾

Question

On which principle sea breeze and land breeze are formed:

Choices

Choice (4) Response

a.

Convection

b.

Radiations

c.

Conduction

d.

None of the above

Question number: 93

» 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: 94

» 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: 95

» Heat » Transfer of Heat » Convection

MCQ▾

Question

Houses in older times had very high roofs with ventilators provided high up based on the principle of:

Choices

Choice (4) Response

a.

Convection

b.

Conduction

c.

Radiations

d.

All of the above

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