Rohan was sitting in the front seat of the car with his father while they were going to the grocery store. It was the noon time and the roads were quite jammed with vehicles. Rohan noticed that to cope with the traffic his father used to look at the rearview mirrors to check the vehicles which are on either side of his car and to check out the vehicles at the back he looked into the rearview mirror. He did not turn back to look at the rear windshield.
What discomfort would Rohan's father be facing if the car would be having an opaque material in the place of the rear windshield?
Important Questions on Sorting Materials into Groups
The Han dynasty, Chinese court official, Cai Lun is renowned as the inventor of a method of papermaking using rags and other plant fibers in . Since then, paper is not only limited to writing purposes but their usage is extended to various purposes.
Nowadays paper is widely used for making carry bags instead of plastics as plastics are an environmental threat.
Although burning of paper cause smoke, carbon monoxide and other pollutants, these are termed as eco-friendly. Could you explain why?
Ravi added some salt into water and found that salt got vanished after sometimes and forms a clear solution. But he found some solids floating over the surface of the water.
Help Ravi to learn about the property of the salt that helped it in getting vanished but some particles remained floating.
Rahul's house is getting painted. The painters asked for some turpentine oil to wipe the paint off their hands and from the floor after finishing their work. Rahul gave them water to clean the paint from their hands and from the floor. The painters said that they needed turpentine oil or kerosene oil for this purpose.
Rahul was surprised to hear it because he has seen that water only is trypically used for washing and cleaning purposes.
Why didn't the painters washed their hands with water instead of turpentine oil?
As the rainy season is around the corner, Ramya went shopping with her father. Her father bought an umbrella for himself, Ramya also asked for an umbrella from her father. Her father advised her to purchase a raincoat instead of umbrella. She liked one woollen coat that was displayed on the mannequin. Her father smiled and said that it is not a raincoat and her father helped her in choosing a raincoat for her.
a) Why Ramya's father said that the woollen coat displayed on the mannequin was not a raincoat?
b) Which material is used to make raincoat?
Ravi was assisting his mother in preparing the dinner. Ravi's mother asked him to bring the vegetables from the refrigerator and wash them properly. Ravi washed the veggetables properly and gave it to her mother. She then cut, sliced and chopped the vegetables with a set of sharp knives. Ravi was fascinated by how quickly she did all this. Now, Ravi want some information regarding knives. Can you help him in answering them?
a) The knife is usually made from which material?
b) What will happen if a knife is completely made of wood? Explain giving reasons.
Rahul's father is building a new house for them. Rahul's father was requested by the carpenter to get nails from the store. Rahul went with his father to the hardware store and purchased some nails. Rahul's father made him hold the carry bag containing nails on the bike. Rahul felt that the nails were very heavy and wished that the nails need to be lightweight to make it easier to carry and transport.
a) Which material is used to make nails?
b) What will happen if nails are made of plastic?
