Lakhmir Singh & Manjit Kaur Solutions: Air and Water | Lakhmir Singh & Manjit Kaur Solutions: Class 5 Science PDF Download

Q.1. Lowest Layer of earth’s atmosphere ______

Troposphere

Q.2. Water fit for drinking _____

Potable

Q.3. Method used by residential colonies to clean water in overhead tanks ______

Chlorination.

Q.4. Gas essential for burning _______

Oxygen

Q.5. Simplest way of purifying water _______

Boiling

Q.6. The process of settling down of impurities

Sedimentation

Q.7. Water collected by this process is the purest form of water

Distillation

Q.8. Gas which does not support burning

Nitrogen

Q.9. Space shuttle orbits in this region

Thermosphere

Q.10. The process in which we slowly pour clean water in another container after sedimentation 

Decantation

Subjective Type Questions

Q.11. Write down the composition of air. Also mention the two important properties of oxygen.

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.

Q.12. What is atmosphere? What does it comprises of?

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

Q.13. Mention the three ways in which we can purify water.

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

Q.14. What are soluble impurities? Mention the ways in which we can remove soluble impurities from water.

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.

Q.15. How would you prove that air exerts pressure?

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.

Q.16. What are the different ways in which we can remove insoluble impurities from water?

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