Rohit blows air with a straw near the opening of another straw which has its other end in a soft drink bottle as shown in the figure. Which of the following best explains the reason for the rise in the level of the drink?

Blowing of air warms up the air inside the straw.

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Blowing of air decreases the pressure over the open end of the straw.

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Blowing of air increases the pressure on the surface of the drink in the bottle.

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Blowing of air increases pressure over theopen end of the straw.

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Solution

The correct option is B Blowing of air decreases the pressure over the open end of the straw.

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Question 3

Figure 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 rise in level of the drink?

(a) Blowing of air decreases pressure over the opening of the straw.

(b) The straw of the soft drink bottle collapses when air is blown over its open end

(d) Blowing of air increases the pressure on the surface of soft drink in the bottle.

State whether the following statements are true or false :

(a) The pressure exerted by a liquid depends on the area of base of its container ?

(b) A drinking straw works on the pressure exerted by the liquid filled in a soft in a soft drink bottle in which it is placed.!

Q. Rohan blows air with a straw near the opening of another straw which has its other end in a soft drink bottle. The level of the soft drink in the straw rises up as air is blown over its open end. What will be the best reason for rise in level of the drink?

Q. While drinking a soft drink with the help of a straw the pressure in the straw is ______ and the pressure in the bottle is_______

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