Question: List all the items known to you that float on water. Check and see if they will float on an oil or kerosene.
Answer: (A) List of some items that float on water:
- Paper
- Wood
- Thin plastic sheets
- Wax
- Ice
- Thermocol
- Oil
(B) List of items that float on an oil:
- Paper
- Plastic sheet
- Wax
- Thermocol
- Wood
(C) List of items that float on kerosene:
- Paper
- Thermocol
- Thin plastic sheet
Question: Why do we need to group materials? Give one reason.
Answer: We often group materials for our convenience. It helps to describe their properties.
Question: Suggest two bases on which we can group objects.
Answer:
- Material used in making the object, e.g. wood or metal/plastic.
- Material of the object is soft or hard, or substance is soluble or insoluble in water.
Question: Is a substance which can be compressed soft or hard?
Answer: Soft.
Question: Select a lustrous material out of the following substances:
Answer: Aluminium.
Question: Which material is generally used for making pens?Wood, aluminium, plastic, cotton
Answer: Plastic or metal.
Question: Is oil soluble in water?
Answer: Oil does not dissolve in water so it is insoluble in water but floats on the surface of water.
Question: Name two objects which are made from opaque materials.
Answer: Wooden doors, blackboard/steel plate.
Thanks for this all of the experiments.
This helped me a lot. So thank you.??