अमानक वर्ण

अमानक वर्ण   Hindi grammar questions  for competitive exam  part-5   1  शुद्ध वर्तनी    2 . अमानक वर्ण   (i)  - शुद्ध वर्तनी ➨ बर्तन की शुद्ध " वर्तनी " क्या है ?   बर्तन का शुद्ध वर्तनी ➨ "बर्तन " का शुद्ध वर्तनी   "बरतन " है ∣   (ii) . अमानक वर्ण - हिंदी में बहुत से ऐसे वर्ण हुआ करते थे ,जो की वर्तमान समय में चलन में नहीं है ,अथवा हिंदी के मूल वर्णो में शामिल नहीं है।  इस प्रकार के  सभी वर्ण " अमानक वर्णो " की श्रेणी में  आते हैं Ι  अर्थात वे   " वर्ण " जो पूर्व में तो मान्य रहे हो ,परन्तु वर्तमान वर्णमाला के दृस्टीकोण   से मान्य न  होते हो , अमानक वर्ण है ।     अमानक वर्ण क्या है ➨ ऐसे वर्ण जिनका कोई " मानक " न हो , तथा जो सर्वमान्य न हो " अमानक " वर्ण है , अथवा ऐसे वर्ण जिनका पहले तो मानक रहा हो परन्तु वर्तमान समय में उनका कोई " मानक " न  हो अमानक वर्ण कहलाते है ।   अमानक वर्ण किसे  कहते है ➨ जब कोई वर्ण वर्तमान परिपेक्ष्य  के मानकों  पर खरा नहीं उतरता अथवा

Notes on Synthetic Fibres and Plastics

Notes on Synthetic Fibres and Plastics

Notes on Synthetic Fibres and Plastics

Notes on Synthetic Fibres and Plastics



HELLO, friends, in this article we have given questions related to class 8 science chapter 3 extra questions of cbsc / ncert - whose topic is - Synthetic Fibres and Plastics class 8 cbse questions. Friends, I hope that you have answered this article related to class 8 science chapter 3 extra questions of cbsc / ncert - whose topic is class 8 science chapter 3 notes pdf would have liked.


1- synthetic fibre- fibre that are made by humans being are called synthetic fibres. 


2- thermoplastics- plastic that can be reheated and remodeled are called thermoplastic. 


3- thermosetting plastics- plastic that cannot be e remodeled after reheating are called thermosetting plastic.

 
4- non- bio gradable- substances that cannot be decomposed by microorganism are called non- biodegradable


Question-1- what are synthetic fibres? Give two examples? 


Ans- fibres that are made by human beings called synthetic fibres. 

Example- nylon , rayon


Question-2- give two uses each of rayon, polyester and spandex? 


Answer- rayon is used for making suits, jackets, scorves, ties, home furnishing cbed sheets, curtains, table cloths, etc. And bandages. 


Question-3- what are the properties and uses of Nylon? 


Answer- properties 

* it is elastic and does not lose strength even after repeated use. 

* it is  lustrous and easy to wash. 

* it is waterproof. 


Uses- nylon is used for making socks, stockings, tents, umbrellas, parachutes and tarpaulins. Nylon fibres are used for making toothbrush bristles. 

Question 4- plastic are poor conductors of heat. What does this property of plastic makes them suitable for ? 


Answer- thermal conductivity - plastic have low thermal conductivity C.I.E., they are poor conductors of heat. This makes them suitable for.. 


* making handles of cooking uses. 

* use in refrigerator. 

* making container used in in microwave ovens. 


Microorganisms class 8 (CLICK HERE)

class 8 science chapter 3 question answer

class 8 science chapter 3 question answer


Question-5- what do the following stand for- PP , HDPE , PS and PET? Right to use of each? 


Answer- 


1-PET(polythene )- making containers for microwave cooking, bottles of carbonated beverages, water bottles, and other food container. 


2-HDPE(high density polythene)- making containers for strong and corrosive household and industrial chemical such as breaches and acids. 


3-pp(polypropylene)- making retchup bottles, yoggust containers, medicine bottles and automobile battery casing. 


4-PS (polypropylene)- thermocol, of form of PS, is used for making disposable cubs and packing material for fragile items like computers and televisions. 


Questions-6- suggest ways of countering the the harmful effect associated with plastic disposal? 


Answer- reducing the uses of plastics and recycling plastic objects are two ways of counting .the harmful associated with plastic disposal. Recycling of plastic objects involves collecting, sorting and processing plastic waste with an aim to to reuse the material in in manufacturing other products. 

CBSE NCERT Class 8 Science

CBSE NCERT Class 8 Science



Question-7- what are the advantages and disadvantages of synthetic fibres? 


Answer- 

1-advantages of synthetic fibres. 


* most synthetic fibre have good elasticity. 

* most fibres made of synthetic fibres do not wrinkle easily. 

* most synthetic fibre can handle heavy loads without breaking. 


2- disadvantages of synthetic fibres. 


* most fibres made from synthetic fibres require ironing as they melt easily. 

* most fibres made from synthetic fibres absurd very little moisture. they become sticky when the body sweats, which make them uncomfortable to wear in hot weather. 


* Most fabrics made from synthetic fibres catch fire very easily. Therefore, it is dangerous to wear them near a source of fire(e.g., while working in the kitchen) 


Question-8- describe the general properties of plastics? 


Answer- 
1-thermal conductivity- plastic have low thermal conductivity(i-e, they are conductors of heat) 


* making handles of cooking vessels. 

* use in in refrigerator(as foam care) 

* making containers used in microwave oven. 

2- electrical conductivity- plastics are poor conductors of electricity. 

3- solubility in water- plastic are insoluble in water. 

4- effect of flame- most plastic are inflammable.

5- reactivity- plastic do not corrode or rust. 


synthetic fibres and plastics class 8 extra questions answers

synthetic fibres and plastics class 8 extra questions answers




Questions-9- explain the harmful effects associated with the disposal of plastics? 


Answer- 
1-plastic that get buried prevent rainwater form seeping into the ground. This water forms muddy puddles on the surface. this also effect the plants growing in the area as they do not get enough water from the soil. 

2- when plastic are burned, the produce tonic gases and smack. 

3- plastics dumped in water bodies pose a threat to aquatic as tonic substances present in them can cause reproductive failure in in fish and other aquatic organism. 

4- most plastic wastage and up lettering roadside and form Agali dumps that harbour many diseases causes organism. 

Question-10- list a few thing that can be done to Limit the harmful effect associated with plastic? 

answer- a few things that can be done to limit the harmful effects associated with plastic are as follows. 

* do not throw plastic waste at roadside or in water bodies. Look for proper garbage beans to disposal them. 

* reuse the plastic bags that you have at home. 

* do not accept plastic that then you go out for shopping. In street, ask for paper bags for carry a reusable cloth back with you. 

* use separate garbage bin at your home and school for or biodegradable and non biodegradable wastes.


ncert solutions for class 8 science chapter 3 extra questions

ncert solutions for class 8 science chapter 3 extra questions


Question-10- what are the main difference between thermoplastic and thermosetting plastic? give One example of each? 


Answer- Thermoplastic 


* liner and lightly cross linked polymers form class of plastics called thermoplastics. 


* thermoplastic can be melted by heating and thereafter modulate into you desired soaps. This is a reversible process. 

*PVC and LDPE are example of of thermoplastics. 


2- thermosetting plastics 


* heavy cross linking after SHAPING the plastic forms are class of plastics called thermosetting plastic. 


* unlike thermoplastic, thermosetting plastics cannot be remodeled reheating. 


* melamine are example of thermosetting plastic.



( ALL TOPIC)  Agriculture,Crops,Ploughing,Fertilizers,Irrigation,
weeding,Pesticides,Animal husbandry.







friends, in this article we have given questions related to class 8 science chapter 3 extra questions of cbsc / ncert - whose topic is - Synthetic Fibres and Plastics class 8 cbse questions. Friends, I hope that you have answered this article related to class 8 science chapter 3 extra questions of cbsc / ncert - whose topic is - class 8 science chapter 3 notes pdf would have liked.
thankyou 




इस ब्लॉग से लोकप्रिय पोस्ट

अमानक वर्ण

sanskrit varnamala mock test

प्रौढ़ावस्था किसे कहते हैं