Polymers

Q.

Give two examples of thermoplastics and thermosetting plastics?

Q.

Give some examples of thermoplastic and thermosetting plastics.

Q. The word 'polymer' is derived from a greek word which means 'many units'.

1. True
2. False

Q. Which of the following soils is the best suitable for the cultivation of wheat?

1. Clayey soil
2. Loamy soil
3. Silt soil
4. Sandy soil

Q.

When a little soil is mixed in water, some foamy things float on the surface of the water while others sink. What floats on the water?

1. Gravel

2. Loam

3. Clay

4. Humus

Q. A man digging a pit found that he could dig with ease initially but digging became difficult as he went deeper. He could not dig beyond a depth of 5 feet. Provide a suitable scientific explanation.

Q. Match the following layers of soil with their respective properties.

1. Hardest layer
2. Soft and porous
3. Lumps of rocks
4. Retains less water

Q. In which of the following processes is the land surface removed by water, wind or ice?

1. Soil sewage
2. Soil erosion
3. Soil weathering
4. Soil seepage

Q. Which among the following organisms help to loosen the soil and makes it porous?

1. Centipedes
2. Millipedes
3. Snails
4. Earthworms

Q. Match the following types of soil based on percolation rate of water. (Consider the time taken is same for all the soils)

1. Sandy soil
2. Clayey soil
3. Loamy soil

Q. Small molecules like water, ammonia, etc. are released during polymerisation.

1. addition
2. condensation
3. homo

Q. Sort the layers of Soil from top to bottom.

1. Top soil
2. Subsoil
3. Parent rock
4. Bedrock

Q. The monomer unit of cellulose is .

1. glucose
2. amino acid
3. isoprene

Q. While analyzing a piece of plastic, John observed that it softened on heating and hardened on cooling. He was also able to mould it into different shapes after heating. Which amongst the following might be that material?

1. Melamine
2. PVC
3. Terylene
4. Bakelite

Q. The plastic that is used to make pipes is popularly known as PVC. What does PVC stand for?

1. Phosphovinyl chloride
2. Phosphovanadium chloride
3. Polyvanadium chloride
4. Polyvinyl chloride

Q. Which amongst the following is used to make the pipes used to supply water?

1. Bakelite
2. Melamine
3. Polyvinyl chloride
4. Polystyrene