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Question
Figure 8.2 shows a child blowing air with a straw near the opening of another straw which has its other end in a soft drink bottle. It was observed that the level of the soft drink in the straw rises up as soon as air is blown over its open end. Which one of the following best explains the reason for rising in the level of the drink?
Options
The blowing of air decreases pressure over the opening of the straw.
The straw of the soft drink bottle collapses when air is blown over its open end.
The blowing of air warms up the air inside the straw
The blowing of air increases the pressure on the surface of the soft drink in the bottle.
Solution
The blowing of air decreases pressure over the opening of the straw.
Explanation:
The blowing of air decreases pressure over the opening of the straw.
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