NCERT 5th Class (CBSE) Science: Air and Water

Question: What is the atmosphere?

Answer: Air is a layer around the earth. This layer is called the earth’s atmosphere.

Question: Name the various layers of the atmosphere.

Answer: The various layers of the atmosphere are:

1. Troposhere
2. Stratosphere
3. Mesosphere
4. Thermosphere
5. Exosphere

Question: How does the atmosphere protect us from meteoroid hits?

Answer: The atmosphere protects us from meteoroid hits by burning them up in the mesosphere before they can hit the surface of the earth.

Question: What is air pressure.

Answer: The weight of air pushes everything around it in all directions is called air pressure.

Question: Name any three impurities that make unfit for use.

Answer: The three impurities that make unfit for use are:

1. Sand
2. Mud
3. Dirt

Question: The two types of impurities in water? Give examples.

Answer: The two types of impurities in water are:

1. Impurities that dissolve in water are called soluble impurities.
2. Eg: salt, sugar.
3. Impurities that do not dissolve in water are called insoluble impurities.
4. Eg: sand, mud.