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

Air bubbles escape into the beaker

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The pressure in the basin increases

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The water level in the beaker increases

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The water level in the basin increases

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Solution

The correct options are
A Air bubbles escape into the beaker
B The pressure in the basin increases
C The water level in the beaker increases
When Venu blows the straw, he applies pressure by pushing air into which form air bubbles in water, the pressure in the basin increases and the water level in the beaker increases. The air bubbles formed in the water escape into the beaker.

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Similar questions

Q. Meena conducted an experiment as shown above. When she pushed the bottle into the basin of water, she could see bubbles escaping from the rubber tube into the beaker of water. What can she infer from her experiment?

Venu blows into the straw as shown above. What will be observe?

Q. Prabhu pushes an empty glass into a basin of water. The water is unable to enter the glass because air is occupying the space in the glass.
What can Prabhu do to allow the air to escape and the water to enter and take its place?

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.

Q. An experimental set-up is given here to demonstrate that CO₂ is given out during respiration. Four students made the following observations marked as I, II, III and IV.

I. Level of water remained the same in both the beaker and the delivery tube
II. Level of water increased in the delivery tube
III. Level of water reduced in both the beaker and the delivery tube
IV. Water ascends into the delivery tube and back flows into the beaker.
Which one of the above is the correct observation?
(1) I
(2) II
(3) III
(4) IV

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