NCERT 6th Class (CBSE) Science: Sorting Materials into Groups

Question: What is common between salt and sand?

Answer: Both have mass and are in solid state.

Question: List three liquids which are transparent.

Answer: Water, alcohol and Acetone/Benzene.

Question: Write two substances which are made from leather.

Answer: Belt and shoes.

Question: Name some substances which are made from plastics.

Answer: Toys, plates, cups, buckets, baskets.

Question: Which is more hard, sponge or iron?

Answer: Iron is harder than sponge.

Question: Write two gases which are soluble in water.

Answer: Oxygen, Carbon dioxide.

Question: Name two gases which are insoluble in water.

Answer: Hydrogen and Nitrogen.

Question: Write any four properties of materials.

Answer:

1. Appearance
2. Hardness
3. Solubility
4. Float or sink in water
5. Transparency

Question: Why is a tumbler not made with a piece of cloth?

Answer: We use tumblers made of glass, plastic and metal to keep a liquid. These substances can hold a liquid.
A tumbler made of cloth cannot hold a liquid because:

1.  Cloth piece is not hard enough to hold liquids and
2.  Cloth piece has very minute pores through which the liquid oozes out.

Question: What are the similarities between iron, copper and aluminium?

Answer:

1.  They all have lustre,
2.  They are all metals,
3.  They are hard.

Question: Mention some materials which are made up of paper.

Answer: Books, notebooks, newspapers, toys, calendars, etc.

Question: Why is water important for our body?

Answer:  Water can dissolve a large number of substances, so it is needed by the body. It is also major part of our body cells.