Lakhmir Singh Manjit Kaur Class 5 Science 8th Chapter “Air And Water” solution

Lakhmir Singh and Manjit Kaur Science solution: “Air And Water” Chapter 08. Here you get easy solutions of Lakhmir Singh and Manjit Kaur Science solution Chapter 08 . Here we give Chapter 08 all solution of Class 5. Its help you to complete your homework.

Board – CBSE

Text Book – SCIENCE

Class – 5

Chapter – 08

Objective Type Questions

(1) Give one word for the following.

(a) Lowest Layer of earth’s atmosphere ______

(b) Gas essential for burning _______

(c) Water fit for drinking _____

(d) Simplest way of purifying water _______

(e) Method used by residential colonies to clean water in overhead tanks ______

Ans. (a) Troposphere (b) Oxygen (c) Potable (d) Boiling (e) Chlorination.

(2) Match the following

Column A	Column B
(a) Aircraft fly in this region	(iv) stratosphere
(b) Temperature decreases with increasing altitude	(i) mesosphere
(c) It extends from 90 km – 500 km	(v) thermosphere
(d) It is the site where all weather takes place	(ii) troposphere
(e) It has very thin layer of air	(iii) exosphere

(3) Fill in the blanks.

(a) Argon

(b) Impurities

(c) Atmosphere

(d) Filtration

(e) Soluble impurities

(4) Choose the correct option.

(a) The process of settling down of impurities – Sedimentation.

(b) Space shuttle orbits in this region – Thermosphere.

(c) Water collected by this process is the purest form of water – Distillation.

(d) The process in which we slowly pour clean water in another container after sedimentation – Decantation.

(e) Gas which does not support burning – Nitrogen.

Subjective Type Questions

(5) Answer the following.

(a) Write down the composition of air. Also mention the two important properties of oxygen.

Ans. Air comprises of a mixture of gases. It has 78% of nitrogen which does not support burning. Oxygen is 21% which is essential for all living things.

Two important properties of oxygen:

(i) Oxygen is essential for burning.

(ii) It supports plants, animals and other organisms.

(b) What are soluble impurities? Mention the ways in which we can remove soluble impurities from water.

Ans. The impurities that dissolve in water are called soluble impurities like salt and may other chemicals.

Remove soluble impurities from Water:

In this process ,the compound is dissolved in a solvent, the solution is filtered to remove the insoluble impurities, and the solvent evaporated to produce the solid compound. The insoluble impurities are left behind in the filter paper.

(c) What is atmosphere? What does it comprises of?

Ans. The layer of air that surrounds the earth is called atmosphere.

Atmosphere comprises of five layers:-

(i) Troposphere

(ii) Stratosphere

(iii) Mesosphere

(iv) Thermosphere

(v) Exosphere

(d) How would you prove that air exerts pressure?

Ans. Hold the bowl in your hand. Put the balloon in it and blow air into it till the balloon fits into the bowl.

Take your hands away and leave the bowl.

You are able to lift the bowl with the balloon. This shows that air exerts pressure.

(e) Mention the three ways in which we can purify water.

Ans. The three ways by which we can purify water are: Boiling, Distillation and Chlorination.

(f) What are the different ways in which we can remove insoluble impurities from water?

Ans. The different ways by which we can remove insoluble impurities from water are:- Sedimentation, Decantation and Filtration.

Next Chapter Solution Link:

• Chapter 1) Plant Reproduction
• Chapter 2) Habitats and Animals
• Chapter 3) Movements and Breathing
• Chapter 4) Skeletal And Nervous System
• Chapter 5) Health And Hygiene
• Chapter 6) Safety And First Aid
• Chapter 7) Rocks, Minerals And Soil
• Chapter 9) Volcanoes, Earthquakes And Storms
• Chapter 10) Our Universe
• Chapter 11) Force, Machine And Energy
• Chapter 12) Pollution
• Chapter (13) Saving Our Resources