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Thermocol - class-VI

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Electrical wires have a coating of an insulated material. The material generally used is :

  1. sulphur

  2. graphite

  3. PVC

  4. None of the above


Correct Option: C
Explanation:

PVC is an abbreviated form of polyvinyl chloride. The electrical characteristics of PVC such as electrical insulating properties or dielectric constant are excellent and hence, are used as insulating materials.

Which of the following is thermoresistant polymer ?

  1. Orlon

  2. Polythene

  3. Teflon

  4. Bakelite


Correct Option: C
Explanation:

Teflon is thermoresistant polymer.


It is also called polytetrafluoroethylene. It is chain growth homopolymer of tetrafluoroethylene $(CF _2=CF _2)$.

$nCF _2=CF _2 \xrightarrow [Polymeriation]{\Delta} (-F _2C-CF _2-) _n$  

State true or false.


Like synthetic fibres, plastic is also a polymer.

  1. True

  2. False


Correct Option: A
Explanation:

Plastics are made of very large molecules and hence plastic is a polymer.

The plastics which soften upon being heated but regains all its original properties on cooling are known as:

  1. thermoplastics

  2. thermosetting plastics

  3. thermoelastic

  4. cellulose


Correct Option: A
Explanation:

The plastics which soften upon being heated but remain an original properties on cooking are known thermoplastics.

Example: Polythelene, PVC, Acrylic, Nylon and Teflon

Plastic can be used for:

  1. polythene bags

  2. food packaging

  3. electrical appliances

  4. All of the above


Correct Option: D
Explanation:

Plastic in today's world plays a very important role in day to day life. They are most commonly used as polythene bags (carry bags). Also they are used in food industry for packaging as wrappers, tetra packs for milk etc. Plastics can be good thermal insulator. Hence, can be used to coat all the electrical appliances.

______ are the substances are capable of molding and casting into various shapes and sizes.

  1. Thermosettig plastic

  2. Thermoplastic

  3. Polyamide

  4. Polyesters


Correct Option: B
Explanation:

Thermoplastics are materials which become soft on heating and gets hardened when cooled. This process of heating and cooling can be performed several times on thermoplastic without significant change in its characteristics. Due to these properties, thermoplastics can be molded and cast into various shapes and sizes

Which of the following is used in automobile battery casings?

  1. HDPE

  2. PP

  3. PVC

  4. Polyester


Correct Option: B
Explanation:

 The purpose of a battery casing is for enclosing and hermetically sealing a battery body which converts chemical energy into electrical energy in order to generate current to power an electronic device. 

Battery casing is manufactured in layers. The casing layers are developed from various raw materials and can include one or two, for example, polyethylene terephthalate layers, a polymer layer, and a polypropylene layer. 


Among the given option the correct answer is B.

These are generally the bad conductors of heat :

  1. Synthetic fibres

  2. Natural fibres

  3. Cranes

  4. Plastics


Correct Option: D
Explanation:

Plastic is a poor conductor of heat and electricity. This makes it suitable to make the covering of electric wires, handles of electrical appliances, handles of utensils, kitchenware etc.

Which out of the following is used for making disposable cups?

  1. LDPE

  2. PS

  3. PP

  4. PVC


Correct Option: B
Explanation:
A paper cup is a disposable cup made out of paper and often lined or coated with plastic or wax to prevent liquid from leaking out or soaking through the paper. Disposable cups are made up of Polystyrene (PS).

The main advantages of polystyrene cups are-

They use fewer raw materials and their manufacturing process consumes less energy and produces less waste than that of paper cups.
 Polystyrene cups are also lighter than paper ones, which leads to lower transport costs.
Option B is correct.

These processes can be used to prevent health hazards of plastics

  1. Reduce

  2. Reuse

  3. Recover

  4. Recycle


Correct Option: A,B,C,D

Plastics are mainly used by everyone because :

  1. They are cheap

  2. Easy to handle

  3. Do not break

  4. Light weight


Correct Option: A,B,C,D
Explanation:

Plastics are mainly used by everyone because it is light weight, cheap, easy to handle and does not break easily.

Which of the following are examples of transparent material?

  1. Glass

  2. Water

  3. Plastic

  4. All of these


Correct Option: D
Explanation:

Glass, water, plastic(some types) are examples of transparent material as the light can pass through them.  

 Which of the following object(s) is/are made of plastics?

  1. Buckets

  2. Lunch boxes

  3. Toys

  4. Water containers


Correct Option: A,B,C,D
Explanation:

All of them are made of plastics because plastic is durable, non- corrosive, light in weight and inexpensive. Thus buckets, lunch boxes, toys, water containers, pipes, etc. are made up of plastic.

Which of the following material is not used in making plate?

  1. Steel

  2. Glass

  3. Plastics

  4. Leather


Correct Option: D
Explanation:

Steel, glass, plastics are used in making plates.

The leather is used for making clothes and shoes.

Polymeric organic materials are called:

  1. elastics

  2. plastics

  3. polythenes

  4. None of these


Correct Option: B
Explanation:

Polymeric organic materials are called plastics.

Most plastics are synthetic solids composed of petroleum in long chain of polymer bonds.

The use of plastic material polyesters is in:

  1. toys

  2. combs

  3. recording tapes

  4. All of the above


Correct Option: C
Explanation:

Plastic material polyester used in Recording tapes. 

Toys and combs are made up of PVC and bakelite.

Polyblend is ___________________.

  1. A mixture of two different types of plastics

  2. A fine powder of recycled modified plastic

  3. A blend of plastic and bitumen

  4. None of these


Correct Option: B
Explanation:

Ahmed khan, a plastic sack manufacturer of Bangalore in 1998, developed polyblend, a fine powder of recycled modified plastic in collaboration with R. V. Collage of Engineering and Bangalore city Corporation. He proved that the mixture of polyblend and bitumen was better for road carpeting as it had better water repellent property. It increased road life by a factor of three.

The materials like plastics are not acted upon by physical process.

  1. True

  2. False

  3. Either

  4. Neither


Correct Option: B
Explanation:
Materials like plastics are non-biodegradable which are not broken down into simpler substances by the action of microbes. Such materials can only be broken down by physical processes under the conditions of high temperature and pressure. The non-biodegradable items persist in nature for a long period of time and hence, for their elimination, they are acted upon physical processes because they are made up of cross linked polymers which can be broken down under extreme physical conditions.
Hence, the statement given in the question is not correct.
So, the correct answer is 'False'.

Give are the sets of terms. Identify the odd term. Write the category of the other.

  1. Plastic

  2. Nylon

  3. Cotton

  4. Rubber

  5. Foam


Correct Option: A

Ecological imbalance in the biosphere is created by 

  1. Cutting of forests

  2. Conservation of forest

  3. Production of more plastics

  4. Both A and C


Correct Option: D
Explanation:

Deforestation means the felling and clearing of forest cover or tree plantations in order to accommodate agricultural, industrial or urban use. It involves permanent end of forest cover to make that land available for residential, commercial or industrial purpose. Deforestation can also be seen as removal of forests leading to several imbalances ecologically and environmentally. Synthetic products are materials that are made by chemical processes that are formed artificially by chemical synthesis such as plastic bags, chairs, toys, etc. These synthetic materials can last for years and cannot be decomposed by decomposers. These synthetic products like different plastic products are made up of plastic; this creation of man hinders the flow of materials in the biosphere. Improper disposal is one of the reasons why synthetic products become of the problems and causes of ecological imbalance. It destroys ecosystem that can kill the organism and at the same time it causes various problems in the living world such as pollution.

Therefore, the correct answer is option D.

What is the best method to avoid pollution by using plastic bags?

  1. Bury the plastic bags in the soil

  2. Use biodegradable plastic bags

  3. Throw the plastic bags into the river

  4. Burn the plastic bags in a rubbish dump


Correct Option: B
Explanation:

The plastics are the non-biodegradable wastes because they are synthetic polymers which cannot be acted upon by the microbes. The plastics should not be dumped in the soil, river or rubbish dump. The biodegradable plastics should be used which will reduce the pollution and the problems created by the use of plastics. 

Thus, the correct answer is option B. 

Who proved that blends of polyblend (plastic waste) and bitumen, when used to lay roads, enhanced the bitumen's water repellent properties and helped to increase road life?

  1. Amrita Devi

  2. Ramdeo Misra

  3. WH Pearsall

  4. Ahmed Khan

  5. Ramesh Chander Dagar


Correct Option: D
Explanation:

K. Ahmed Khan is an Indian scientist and businessman who made success in using plastic for road construction. He is the founder of KK Plastic Waste Management Pvt.Ltd.He along with his brother Rasool Khan, stung by protests to ban plastic, hit upon the idea of recycling plastic and mixing it with bitumen to lay roads. Ahmed Khan proved that blends of Polyblend and Bitumen, when used to lay roads enhanced the bitumen's water repellant properties and helped to increase road life by a factor of three.

So the correct answer is 'Ahmed Khan'.

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