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.
- Float or sink in water
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:
- Cloth piece is not hard enough to hold liquids and
- Cloth piece has very minute pores through which the liquid oozes out.
Question: What are the similarities between iron, copper and aluminium?
- They all have lustre,
- They are all metals,
- 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.