 As per the new rule applicable from 2014 onwards the rechecking (verification of marks), getting photocopy of answer book and applying revaluation is now three step process. No one is allowed to jump steps or skip any step. All the steps have to be completed online. No offline application will be accepted.
First Step : Apply for rechecking (Verification of Marks i.e. re-totaling only) within a weeks from the date of declaration of result (this year 30.5.2014 to 05.06. 2014). If not satisfied with marks go to step two else exit process. Second Step : Apply for Photocopy of answer sheet within 21 days (this year from 20.6. 2014 to 23.06.2014). If not satisfied go to step three else exit process. Third Step : Apply for Revaluation of Marks (max 10 questions) within five weeks of declaration of result (this year 28.06.2014 to 04.7.2014). NOTE : No one can apply for revaluation directly or can get photocopy of answer sheet without applying for verification of marks. >>Click Here to Apply online<<Now understand the process for each step : (1) How to apply for Verification of Marks (Rechecking)
Only those candidates who have applied for verification of marks will be eligible to apply for obtaining photocopy of the evaluated answer book(s)on remitting the requisite fee of Rs.700/- per subject and the schedule for receipt of forms will be from 20.6. 2014 to 23.06.2014. The procedure is as under:
CLASS XII/X - Central Board of Secondary Education
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1. EQUATION: The statement of equality is called an equation. 2. Linear equation in one variable: An equation of the form ax+b=0,where a,b are real numbers,(a≠0) is called a linear equation in one variable. 3. Linear equation in two variables: An equation of the form ax+by+c=0, where a,b,c are real numbers(a≠0,b≠0)is called a linear equation in two variables x and y. 4. Consistent system of linear equations: A system of two linear equations in two unknowns is said to be consistent if it has at least one solution. 5.Inconsistent system of linear equations: if a system has no solution, then it is called inconsistent. The system of a pair of linear equations a1 x+b1 y+c1 =0 a2 x +b2y+c2 =0 (i) has no solution. If a1/a2 = b1/b2 ≠ c1/c2 (ii) has an infinite number of solutions If a1/a2 = b1/b2 = c1/c2 (iii) has exactly one solution. If a1/a2 ≠ b1/b2 6. Algebraic methods: (i)Method of substitution (ii)Method of elimination by addition or subtraction (iii) Method of cross multiplication for: a1 x+b1 y+c1 =0 a2 x +b2y+c2 =0 X= (b1c2 – b2c1) /(a1b2 – a2b1) , y = (c1a2 – c2a1) / a1b2 - a2b1 More........ 
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 8th synthetic materials
Þ Synthetic materials are kinds of materials obtained from the synthesis of chemicals. Þ The chemicals used for synthetic materials are obtained from petroleum and natural gas(methane) Þ Petroleum and natural gas is compound of hydrogen and oxygen called hydrocarbon. Þ Monomers are simple chemical molecules of hydrocarbon. Þ When monomers join end to end form a long chain of monomers called polymers. The process of the formation of polymers is called polymerization. Þ Cellulose [beet root] is polymers of glucose while Hemoglobin is polymers of amino acid. Þ Fibres are thin thread like materials used to prepared cloths. Þ Fibres obtained on mixing natural and synthetic fiber are called semi synthetic fibre. e.g. rayon Rayon Þ Rayon is synthetic fibres obtained from cellulose. Þ Rayon are of three types: Viscose Cupreammonium (cupro) and acetate rayons. Viscose Rayon Þ In industry cellulose dissolved in mixture of sodium hydroxide (NaOH) and CS2 (carbon disulphide) to get Viscous liquid [semi solid] called viscose. Þ Viscose is forced to spinnerets [an apparatus having small holes like shower] into an acid bath [through solution of acid like H2SO4] . Thus filaments of rayon are obtained which is spun into thread. Cupro Rayon Þ Cupro Rayon are obtained on dissolving cellulose into solution of CuSO4 and NH4 . The dissolve solutions forced to spinnerets into an acid bath to get filaments of cuprammonium rayon are obtained which is spun into thread. Acetate Rayon Þ Acetate Rayon is obtained on dissolving cellulose into solution of Acetate and H2SO4. Rayon in our daily life Þ Rayon mixed with cotton or silk to make smooth and silky cloth in textile industry. Þ Rayon mixed with wool to make carpet. Þ Rayon are also used for making reinforced tyre, bangles and surgical dressing Þ The name Nylon derived from the New York [NY] and London[LON] as Nylon was first produce in both places at same time. NYLON Þ Nylon (polyamides) was first prepared in 1935 chemically. Þ Nylon are prepared using cyclic hydrocarbon Benzene(C6H6) Þ Nylon has silk like texture and high tensile strength[Drawn into long thin straps] Nylon in our daily life Þ Nylon is mainly used for making ropes, woman’s wear, fishing net, sari socks and tie Polyster Þ Polyster is obtained from polymer of ethene. It has maximum stretchable strength. Þ Terylene, Dacron are kinds of Polyster used for dress, cloth and curtain. Þ Terylene mixed with cotton and wood to produce terycot and terry wool respectively. Þ Polysters are also used for making sail for sail boat and conveyor belts. Acrylics Þ Acrylics fibres are obtained on dissolving acetylene[C2H2] into suitable solvent like HCN and then forced to spinneret because acetylene decompose without melting. Acrylics in our daily life Þ They are light and soft like wool. The y are crimpy (wavy) and straight like Polyster thus appear to be bulky and look like wool. Þ They are resistant to weather as they are not easily acted upon by moisture. Advantages of synthetic fibres Þ Having long lasting luster and do not turn yellow with age Þ Easy to clean and dry up quickly Þ Durable and do not shrink on washing Þ They are less expensive than cotton Þ They do not depend on plants or animal like cotton Advantages of synthetic fibres Þ The get electrically charged in dry weather and cause skin irritation Þ The melt and form sticky beads on heating. There is always a risk of getting burn in kitchen Þ They are hydrophilic as do not absorb sweat and moisture thus uncomfortable to wear. Þ They are non bio degradable and cause pollution. Þ They are good absorber of radiant heat and not fit in summer. Good to more good To make make wide spread use of synthetic material it is mixed with natural fibre .There are called blend fibre. PLASTIC Þ Plastic : Any material which can be molded into any desirable shape on heating is called plastic Þ Petroleum product such that Ethane, propane, benzene ,toluene etc are used for manufacturing plastic. Plastic Thermoplastic Thermosetting Thermosetting Plastic Þ Thermosetting plastics are kind of plastic which once moulded cannot moulded again by heating. Þ Thermosetting plastics are kind of plastic whose polymers form highly cross linked chain on heating. Þ Bakellite , melanin, Formaldehyde are some of the examples of Thermosetting Plastic Thermoplastic Plastic Þ Thermoplastic are kind of plastic which can be moulded again and again by heating and easily reused. Þ PVS, Polysterine , nylon , polythine are some of the examples of Thermoplastic Plastic Þ Polymers of thermoplastic Plastic have long chain without cross linked to each other. Characteristics of plastic Þ Plastic has much less toughness as compared to metal Þ having light weight Þ It is not affected by acids and bases. Þ Plastic are non bio degradable as it is weather resistant Þ Plastic are bad conductor of heat and electricity Þ Plastic melts on heating Some of the common plastics are a. Polythene Þ it is obtained from polymerization of ethene. it is non bio degradable . Þ it is a kind of thermosetting plastic Þ it is insoluble in any solvent Þ it is light weight Þ it is anti corrosion and insulator Þ it is used for making bag ,adhesive tap, electric wire cover and can b. Polyvinyl chloride (PVC) Þ it is use for making sole of shoe Þ it is use for making covering of electric wire Þ it is use for making sanitary fittings c. Polysterine Þ It is a polymer of polythene . Þ it is a kind of thermosetting plastic Þ it is highly transparent Þ it is use for making cups of hot drink , toy etc. Þ it is use for safe packaging of expensive items Þ it is use for making Styrofoam[themocole] Þ it is use as insulating material in refrigerator d. Teflon Þ It is prepared by using tera- fluroethene. Þ Heat and chemical are not effective on Teflon Þ it is use for making non stick cooking were Þ it is use for making corrosive proof coating in industry e. Bakelite Þ it is a kind of thermosetting plastic Þ it is use for making electrical switches and plug Þ it is use for making gear wheel Þ it is use for making table top Þ it is use for making comb, pen bodies and photograph records f. Melanin Þ It is hard and highly polished polymers used for making unbreakable kitchen were. Study in Depth Trend Setter Synthetic Fibres and Plastics[CBSE 8th Science] Read and Download III Synthetic fiber and Plastic Read and download VIII Synthetic fiber and Plastic Read and download VIII Synthetic fiber and Plastic view video 8th Synthetic fiber and Plastic [Solved Questions] Download File Searches related to synthetic fibres synthetic fibres examples synthetic fibres list names of synthetic fibres synthetic fibres ppt synthetic fibres and plastics synthetic fibres and plastics class 8 properties of synthetic fibres advantages of synthetic fibres |
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