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Rules for Rechecking and Revaluation for CBSE Class 12 Result

30/5/2014

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)

The fee is Rs. 300/- per subject
The period for applying is within 07 days w.e.f. 30.5.2014 to 05.06. 2014
Payment will be received through e-challan/electronic payment gateway.
No application or fee shall be received offline.
The result of verification of marks will be uploaded on the Net. However in case a mistake is detected, a formal letter will also be sent by speed post.
The Board will not be responsible for any loss or damage or any inconvenience caused to the candidate, consequent upon the delay in communication for reasons beyond control
NO REQUEST RECEIVED UNDER RTI FOR VERIFICAITON OF MARKS WILL BE ACCEPTED.

(2) How to apply for Photocopy of Answer Sheet

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:

Only those candidates who have applied for verification of marks shall be eligible to apply for obtaining photocopy(ies) of the evaluated answer-book(s). Applications will be received only online with payment through e-challan/electronic payment gateway alongwith required documents duly scanned.
Candidate applying for obtaining photocopy of the evaluated answer book shall have to upload an undertaking on the prescribed format. The undertaking will have to be scanned and uploaded with the application
Application submitted on behalf of the candidate as also incomplete application will be summarily rejected and fees deposited shall be forfeited without any further reference.
Photocopy of the evaluated answer book would be provided after blocking all information relating to the identity of the Examiner/Evaluators/any other official associated with the examination process
Photocopy of the evaluated answer book shall be uploaded on the NET
The candidate shall have to certify that the photocopy of the evaluated answer book shall not be given to any institution or school for display, for commercial purpose or to print media by him/her or anyone on his/her behalf
Decision of the Competent Authority of the Board on the marks awarded shall be final and binding on the candidate.
The Board will not be responsible for any loss or damage or any inconvenience caused to the candidate, consequent to the delay in communication for reasons beyond control
The same shall also not be challenged by any examinee in the court of law or make any claim, on account of this in any forum. An undertaking to this effect will be obtained from the candidate in his/her application.
If a candidate finds any error in totalling of marks or finds that any answer has not been evaluated in the photocopy of the answer book, he/she will approach the Regional Office concerned immediately within seven days.
However, if he/she desires to challenge the marks awarded to any question, then he/she will have to apply online, as per the schedule and only in the subjects notified.
NO REQUEST UNDER RTI FOR PROVIDING OF PHOTOCOPY OF THE EVALUATED ANSWER BOOK WILL BE ACCEPTED.

(3) How to apply for Revaluation (Max 10 Questions)

Only those candidates who have applied for obtaining photocopy of the evaluated answer book shall be eligible to apply for revaluation or challenge the marks awarded to any question(s) in the following subjects only.
English Core, English Elective, Functional English, Hindi Core, Hindi Elective, Mathematics, Physics, Chemistry, Biology, Business Studies, Economics & Accountancy
Request for maximum 10 questions shall be entertained only for theory portion in the above subjects @Rs.100/- per question. Applications will be received only online with payment through e-challan/electronic payment gateway.
Request for revaluation/challenge for particular question(s) only in theory paper shall be received only online from 28.06.2014 to 04.7.2014.
No second request for any additional question(s) shall be accepted
The applicant will have to refer to the marking scheme in the subject concerned which would be available on the website alongwith the question paper and then submit application for revaluation in the required question(s) with reasoning
In case there is variation of marks of +5 marks or more in the subject concerned after revaluation, then the marks awarded in the first evaluation in respect of that subject shall stand annulled and the fresh marks awarded in the revaluation shall only stand valid for that particular subject(s) and a fresh marks statement will be issued incorporating the marks awarded in the revaluation. However, if after revaluation, any change is observed in questions of upto 02 marks i.e. 01 and/or 02 marks, the same shall be considered for addition.
In cases where marks are increased or decreased a fresh marks statement shall be issued to such candidates after surrendering the old Marks Statement by the candidate(s) concerned.
The status of revaluation shall be uploaded on the NET followed by a formal letter by speed post in the subject and question(s) for which applied for
In case of an upward revision of marks in the question, fee paid for revaluation shall be refunded for that particular question(s) only.
The decrease even by one mark shall be effected
In case the marks already awarded remain unchanged or decreased, then the amount of fee paid for revaluation shall not be refunded
No appeal or review against the revaluation would be entertained.
Candidate shall also have to give an undertaking to the effect that the result of Revaluation shall not be challenged in the Court of Law or make any claim on account of revision of marks in any forum.
The Board will not be responsible for any loss or damage or any inconvenience caused to the candidate, consequent to the revision of marks, if any or delay in communication for reasons beyond control
NO REQUEST FOR REVALUATION WILL BE ACCEPTED UNDER RTI.

CLASS XII/X - Central Board of Secondary Education

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PAIR OF LINEAR EQUATIONS IN TWO VARIABLES class 10

28/5/2014

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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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Result of class 10th 2014 CENTRAL PUBLIC SCHOOL TAJPUR ROAD SAMASTIPUR

20/5/2014

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Result 10th CENTRAL PUBLIC SCHOOL TAJPUR ROAD SAMASTIPUR

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Result of class 10th 2014 Sadhana Devi Vidyapith, Samastipur

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08224 - CPS Samastipur
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50315-SDV Samastipur
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CBSE 10th Result 2014

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Ch-The Fundamental Unit of Life Trend Setter Quick Revision

15/5/2014

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CBSE solved ,unsolved test papers,Notes, Assignments and Guess Papers : First Term: The Fundamental Unit of Life. Cell as a basic unit of life; prokaryotic and eukaryotic cells, multicellular organisms; cell membrane and cell wall, cell organelles; chloroplast, mitochondria, vacuoles, endoplasmic reticulum, golgi apparatus; nucleus, chromosomes - basic structure, number.
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9th Chapter : The Fundamental Unit of Life

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Synthetic Fibres and Plastics Science CBSE Class Eight

8/5/2014

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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.

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Physics Motion Numerical Solved and Worksheet for class 9

1/5/2014

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Q. 01. A ball hits a wall horizontally at 6m/s. It rebounds horizontally at 4.4m/s. The ball is in contact with the wall for 0.04s. What is the acceleration of the ball?

Solution:

Initial velocity(u) = 6.0m/s
Final velocity(v) = -4.4 m/s (because direction of ball has become opposite)
time = 0.04 s
thus, acceleration (a) = (v-u)/t
a= [-4.4 – 6.0]/ 0.04
a= (-10.4)/0.04
after multiplying -10.4/0.04 by 100/100 (to make calculations simpler), we get
a= -1040/4 = -260 m/s2

Q.02. A cheetah is the fastest land animal and it can achieve a peak velocity of 100 km per hour up to distances less than 500 metres. If the cheetah spots his prey at a distance of 100 meters what is the minimum time it will take to get its prey?

Solution:

If the cheetah spots the prey at its top speed, the cheetah will hunt down the prey with the speed of 100 km/h. = 27.7 m/s

Now, time = d/s = 100/27.7 = 3.6 sec.

So, the minimum time the cheetah will take to get the prey is 3.6 s.

Q.03. A police jeep is chasing velocity of 45 km/h. A thief in another jeep moving with a velocity of 153 km/h. police fires a bullet with muzzle velocity of 180 m/s the velocity it will strike the car of the thief is?

Solution:

Given: Velocity of police jeep = 45 m/hr = 12.5 m/s Velocity of thief’s jeep = 153 km/hr = 42.5 m/s

Velocity of bullet = 180 m/s

Now, since bullet is fired from police jeep which is going at 42.5 m/s,

Therefore, velocity of bullet is (180 + 12.5) = 192. 5 m/s.

To calculate velocity with which bullet with hit the thief we use concept of relative velocity.

Therefore, we have VBT = VB - VT

Here VB is velocity of bullet and VT is velocity of thief

VBT = 192. 5m/s - 42.5 m/s = 150m/s

Q. 05. A car is travelling at 20 m/s along a road. A child runs out into the road 50 m ahead and the car driver steps on the brake pedal. What must the car’s deceleration be if the car is to stop just before it reaches the child?

Solution:

u = 20m/s ; s = 50m and v = 0m/s

Using, V^2 = u^2 + 2as

a = (v^2 – u^2)/2s

a = (0^2   - 20^2)/(2 x 50) = - 4m/s^2

Acceleration = -4 m/s2 or, retardation  = 4 m/s2

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Rules for Rechecking and Revaluation for CBSE Class 12 Result

PAIR OF LINEAR EQUATIONS IN TWO VARIABLES class 10

Result of class 10th 2014 CENTRAL PUBLIC SCHOOL TAJPUR ROAD SAMASTIPUR

Ch-The Fundamental Unit of Life Trend Setter Quick Revision

Synthetic Fibres and Plastics Science CBSE Class Eight

Physics Motion Numerical Solved and Worksheet for class 9

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Rules for Rechecking and Revaluation for CBSE Class 12 Result

PAIR OF LINEAR EQUATIONS IN TWO VARIABLES class 10

Result of class 10th 2014 CENTRAL PUBLIC SCHOOL TAJPUR ROAD SAMASTIPUR

Ch-The Fundamental Unit of Life Trend Setter Quick Revision

Synthetic Fibres and Plastics Science CBSE Class Eight

Physics Motion Numerical Solved and Worksheet for class 9

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