A list of words is given in box. Use appropriate words to fill up the blanks in the following statements

Air, oxygen, wind, water vapour, mixture, combination, direction, road, bottles, cylinders.

(a) The makes the windmill rotate.
(b) Air is a of some gases.
(c) A weather cock shows the in which the air is moving at that place.
(d) Mountaineers carry oxygen with them, while climbing high mountains.

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Solution

(a) The wind makes the windmill rotate.
(b) Air is a mixture of some gases.
(c) A weather cock shows the direction in which the air is moving at that place.
(d) Mountaineers carry oxygen cylinders with them, while climbing high mountains.

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Question 13.4

A list of words is given in a box. Use appropriate words to fill up the blanks in the following statements.

Air, oxygen, wind, water vapour, mixture, combination,
direction, road, bottles, cylinders.

Mountaineers carry oxygen ___ with them, while climbing high mountains.

Question 13.2

A list of words is given in a box. Use appropriate words to fill up the blanks in the following statements.

Air, oxygen, wind, water vapour, mixture, combination,
direction, road, bottles, cylinders.

Air is a ___ of some gases

Statement I: Mountaineers carry oxygen cylinders with them while climbing high mountains.

Statement II: The percentage of oxygen in air decrease with increasing altitude.

Statement I: Mountaineers carry oxygen cylinders with them when they climb high mountains.

Statement II: Layer of air gets thinner at higher altitudes and breathing becomes difficult.

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