CBSE Class-7 Science: Questions 49 - 54 of 322

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Question number: 49

» Weather, Climate and Adaptations of Animals to Climate » Weather » Rainfall

MCQ▾

Question

Why does it rain?

Choices

Choice (4) Response
a.

By lowering the temperature or bringing in more water

b.

Relative humidity must be 100 percent

c.

Air must be saturated

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

Question number: 50

» 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: 51

» Acids, Bases and Salts » Natural Indicators Around Us » Acid Rain

MCQ▾

Question

Which gases from the atmosphere combines with tiny droplets of water in clouds and leads to acid rain:

Choices

Choice (4) Response
a.

Nitrogen oxide & Sulphur dioxide

b.

Carbon dioxide

c.

Sulphur dioxide

d.

Nitrogen oxide

Question number: 52

» Nutrition in Animals » The Food Pipe & Stomach » Stomach and Its Function

MCQ▾

Question

The inner lining of the stomach secretes:

Choices

Choice (4) Response
a.

Hydrochloric acid

b.

Digestive juices

c.

Mucous

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

Question number: 53

» Acids, Bases and Salts » Acids and Bases » Indicators

MCQ▾

Question

Turmeric, litmus, China rose petals are:

Choices

Choice (4) Response
a.

Chemical indicators

b.

Natural indicators

c.

Indicators

d. Question does not provide sufficient data or is vague

Question number: 54

» Nutrition in Animals » The Food Pipe & Stomach » Small Intestine

MCQ▾

Question

A highly coiled tube in which stomach opens is called as:

Choices

Choice (4) Response
a.

Large intestine

b.

Liver

c.

Small intestine

d. All of the above

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