Consider a child playing with a soft straw. As he tries to suck air into his mouth, the pipe automatically deforms and the flow of air gets choked. This phenomena can be explained by Bernoulli's Principle.

True

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False

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Solution

The correct option is A
True

According to Bernoulli's Principle, pressure decreases with the increase in velocity. As the boy sucks air into his mouth, the velocity of air inside the straw increases and consequently the pressure decreases. So, the atmospheric pressure present outside the straw dominates and causes it to deform. Thus, the flow of air is choked.

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Similar questions

Q. According to Bernoulli principle, air pressure decreases with increase in ________ of air.

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 statement is true or false.

"Carbonate ores get changed into oxides by heating strongly in limited air. This process is known as calcination."

Q. Venu blows air into the straw as shown above. What will he observe?

Q. The fact that, increased wind speed results in reduced air pressure is known as

(a) Galileo principle
(b) Bernoulli principle
(c) Newton principle
(d) Einstein principle

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