Water Vapour

Q. How can we show that air is dissolved in water ?

Q. The amount of water vapour in air is greater in:

1. dry
2. summer
3. autumn
4. rainy

Q.

Question 15

Garima observed that when she left her tightly capped bottle
full of water in the open sunlight, tiny bubbles were formed all
around inside the bottle. Help Garima to know why it so
happened?

Q.

How will you show that air is dissolved in water?

Q. What is fog? How is it formed?

Q.

How water vapour is formed?

Q.

The burning of fuels uses carbon dioxide and releases oxygen

1. True
2. False

Q. Transpiration refers to:

1. Conversion of water to water vapor in water cycle.
2. Release of moisture by plants into the atmosphere.
3. Evaporation of sweat from animals.
4. Water released into amosphere during respiration.

Q.

When we heat water, we see bubbles coming out from it. This shows that

1. air contains water

2. water itself converts into bubbles

3. water contains dissolved minerals

4. water contains air

Q.

Question 4

How will you show that air is dissolved in water?

Q. Does evaporation or condensation keeps us cool?

Q.

38 Garima observed that when she left her tightly capped bottle full of water in open sunlight, tiny bubbles were formed all around inside the bottle. Help Garima to know why it happened?

Q. what is meant by triple point of water?

Q. The amount of water vapour present in air is calculated in terms of ___.

1. density
2. humidity
3. mass
4. volume

Q. Water in its gaseous form is known as .

1. dew
2. water vapour
3. fog

Q. Water in its gaseous form is known as .

1. dew
2. water vapour
3. fog

Q. The gaseous form of water is present as:

1. Ground water
2. Vapour
3. Ice
4. Drinking water

Q. Which of the following activities do not help in increasing the content of water vapour in air?

1. Transpiration
2. Respiration
3. Evaporation
4. Condensation

Q. The source of water droplets on grass in the morning is .

1. soil
2. grass
3. air

Q.

24 (b) State whether the following statements are true or false.

When water is poured into a glass, the air is pushed out of the glass.

1. True
2. False

Q. Mists are produced by:

1. condensation of vapours during chemical reactions
2. particles of spray liquids and by condensation of vapours in air
3. smoke formed during combustion of organic matter
4. fine solid particles produced during crushing and grinding

Q.

how is water cycle related to inter conversion of states of water ?

Q. Garima observed when she left her tightly capped bottle full of water in the open sunlight, tiny bubbles were formed all around inside the bottle. Help Garima to know why it so happened?

Q. Garima observed when she left her tightly capped bottle full of water in the open sunlight, tiny bubbles were formed all around inside the bottle. Help Garima to know why it so happened?

Q. Garima observed when she left her tightly capped bottle full of water in the open sunlight, tiny bubbles were formed all around inside the bottle. Help Garima to know why it so happened?

Q. How is the cyclic movement of rein brought out in the poem?

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.