Question 5

Boojho took an empty plastic bottle, turned it upside down and dipped its open mouth into a bucket filled with water. He then tilted the bottle slightly and made the following observations.

(i) Bubbles of air came out from the bottle.
(ii) Some water entered the bottle.
(iii) Nitrogen gas came out in the form of bubbles and oxygen got dissolved in water
(iv) No bubbles formed, only water entered the bottle.

Which observations is /are correct?

a) (i) and (ii) only

b) (iv) only

c) (iii) and (iv)

d) (i) only

Open in App

Solution

(a) is the correct option.
When the bottle is turned upside down and dipped in the bucket with the mouth opened, the air is present in the bottle, and water enters the bottle. Since air is lighter than water, it rises high and comes out in the form of bubbles when we tilted the bottle slightly.

Suggest Corrections

Similar questions

John and Sam were playing with empty bottles, John took an empty plastic bottle, turned it upside down and dipped its open mouth into a bucket filled with water. He then tilted the bottle slightly and made the following observations.

(i)Water did not enter the bottle when it was in inverted position.
(ii)Bubbles of air came out from the bottle as soon as it was tilted.
(iii)Some water entered the bottle
(iv)No bubbles formed, only water entered the bottle.

Which observations is/are correct?

Q. Raghav dipped an empty bottle vertically in a trough of water as shown in picture 1. He found that water did not enter the bottle. However, when he tilted the bottle slightly, he found bubbles coming out as shown in picture 2.
Figure
(a) Why did water not enter the bottle at first?
(b) Explain what Raghav observed when he tilted the bottle.

Q. An empty glass bottle is fitted with a narrow tube at its mouth. The open end of the tube is kept in a beaker containing water. When the bottle is heated, bubbles of air are seen escaping into the water. Explain the reason.

Paheli kept some water in a beaker for heating. She observed that tiny bubbles appeared before the water started to boil. She boiled the water for about 5 minutes and filled it in a bottle up to the brim and kept the bottle airtight till it cooled down to room temperature.

(a) Why did the tiny bubbles appeared?

(b) Do you think tiny bubbles will appear on heating the water taken out from the bottle? Justify your answer

Question 9

During summer, Boojho carries water in a transparent plastic bottle to his school. One day he left his bottle in the school. The bottle still had some water left in it. The following day, he observed some water droplets on the inner surface of the empty portion of the bottle. These droplets of water were formed due to

(a) Boiling and condensation.

(b) Evaporation and saturation.

(d) Condensation and saturation.

Join BYJU'S Learning Program

(a) is the correct option.When the bottle is turned upside down and dipped in the bucket with the mouth opened, the air is present in the bottle, and water enters the bottle. Since air is lighter than water, it rises high and comes out in the form of bubbles when we tilted the bottle slightly.

(a) is the correct option.
When the bottle is turned upside down and dipped in the bucket with the mouth opened, the air is present in the bottle, and water enters the bottle. Since air is lighter than water, it rises high and comes out in the form of bubbles when we tilted the bottle slightly.