Question papers
free download ,
The Question paper of ,
The Question paper of ,
Higher secondary first year examination
March 2016
Download link
* Physics
* chemistry
* zoology
* botany
* mathematics
☺☺
☺☺
Sunday, 3 April 2016
Higher secondary question paper march , 2016
Download link
* Physics
* chemistry
* zoology
* botany
* mathematics
Tuesday, 12 January 2016
Tuesday, 15 December 2015
Phylum porifera
PORIFERA
- 1, Water canal system_ body wall encloses a cavity (spongocoel).water enters through pores (ostia) and goes out through an osculam , by the action of flagellated cells (collar cells / choanocytes)
Monday, 14 December 2015
Why Bf3 's dipolemoment is zero?
The dipolemoment of
Bf3 become zero . why?
Because B-f bonds are oriented at an angle of 120° to each_other , the three moment gives a net sum of zero . As a resultant of any two is equal and opposite to the third
Bf3 become zero . why?
Because B-f bonds are oriented at an angle of 120° to each_other , the three moment gives a net sum of zero . As a resultant of any two is equal and opposite to the third
Sunday, 13 December 2015
Theorem of parallel axis
Parallel_axis theorem
The theorem states that,
the moment of inertia of a body about any axis is equal to the sum of moment of inertia
of a body about parallel axis ,passing through centre of mass.
And product of mass of the body and the square of the distance between the two axis
The theorem states that,
the moment of inertia of a body about any axis is equal to the sum of moment of inertia
of a body about parallel axis ,passing through centre of mass.
And product of mass of the body and the square of the distance between the two axis
in this figure ,
According to parallelaxis theorem
Moment of inertia about
AB= MI of CD + Ma*2
ie, I= Icm + Ma*2
Monday, 17 August 2015
sample question , for competitive exams
A 60km foot_race was won with a time of about 4h and 40mins. Assuming constant speed,
What was the speed of the winner? ?..
Ans: 3.57 m/s
What was the speed of the winner? ?..
Ans: 3.57 m/s
Wednesday, 1 July 2015
Animals, we can classify 11 Phyla
The kingdom Animalia we can classified into
11 phyla (singular phylum)
* phylum- Porifera ( sponges)
* phylum- Coelenterata( gastro vascular cavitiad animals)
* phylum- Ctenophora( sea walnuts)
* phylum- Platyhelminthes( flat worms)
* phylum- Ashelminthes(round worms)
* phylum- Annelida(segmented worms)
* phylum- Arthropoda(jointed leg animals)
* phylum- Molusca( soft boied animals)
* phylum- Echinodermata
* phylum- Hemichordata
* phylum- Chordata(modern)
11 phyla (singular phylum)
* phylum- Porifera ( sponges)
* phylum- Coelenterata( gastro vascular cavitiad animals)
* phylum- Ctenophora( sea walnuts)
* phylum- Platyhelminthes( flat worms)
* phylum- Ashelminthes(round worms)
* phylum- Annelida(segmented worms)
* phylum- Arthropoda(jointed leg animals)
* phylum- Molusca( soft boied animals)
* phylum- Echinodermata
* phylum- Hemichordata
* phylum- Chordata(modern)
Saturday, 13 June 2015
Tuesday, 9 June 2015
Man's taxonomical categories
Man 's taxonomical categories
Common name : Man
Scientific name : Homo sapiens
Species name : sapiens
Genus : Homo
Family : Hominidae
Order : primata
Class : Mamalia
Phylum : chordata
Kindom: Animal kingdom(animalia)
Common name : Man
Scientific name : Homo sapiens
Species name : sapiens
Genus : Homo
Family : Hominidae
Order : primata
Class : Mamalia
Phylum : chordata
Kindom: Animal kingdom(animalia)
Carl linnaeus's hierarchial system
Structure and some examples of caroul linnaeus's hierarchiel system
There are 7 obligate taxa
Species,genus,family, order, class
Phylum/ division , kingdom
There are 7 obligate taxa
Species,genus,family, order, class
Phylum/ division , kingdom
Friday, 5 June 2015
Thursday, 4 June 2015
Classification of Animals, Kingdom Animalia
Broad classification of kingdom animalia
Based on common fundamental features
Based on common fundamental features
Wednesday, 3 June 2015
law of conservation of mass, lavoisier
Law of conservation of mass was introduced by Antoine Lavoisier
The matter can neither be created , nor distroyed. But one form of the matter can be convert to another form
The law of conservation of mass, or principle of mass conservation, states that for any system closed to all transfers of matter andenergy(both of which have mass),themassof the system must remain constant over time, as system mass cannot change quantity if it is not added or removed. Hence, the quantity of mass is "conserved" over time. The law implies that mass can neither be created nor destroyed, although it may be rearranged in space, or the entities associated with it may be changed in form, asfor example when light orphysicalworkis transformed into particles that contribute the same mass to the system as the light or work had contributed. The law implies (requires) that during anychemical reaction,nuclear reaction, orradioactive decayin an isolated system, the total massof the reactants or starting materials must be equal to the mass of the products.
The matter can neither be created , nor distroyed. But one form of the matter can be convert to another form
The law of conservation of mass, or principle of mass conservation, states that for any system closed to all transfers of matter andenergy(both of which have mass),themassof the system must remain constant over time, as system mass cannot change quantity if it is not added or removed. Hence, the quantity of mass is "conserved" over time. The law implies that mass can neither be created nor destroyed, although it may be rearranged in space, or the entities associated with it may be changed in form, asfor example when light orphysicalworkis transformed into particles that contribute the same mass to the system as the light or work had contributed. The law implies (requires) that during anychemical reaction,nuclear reaction, orradioactive decayin an isolated system, the total massof the reactants or starting materials must be equal to the mass of the products.
law of multiple proportion, john dalton
Law of multiple proportion introduced by, JOHN DALTON
In chemistry, thelaw of multiple proportionsis one of the basiclawsofstoichiometryused to establish theatomic theory, alongside thelaw of conservation of mass(matter) and thelaw of definite proportions. It is sometimes calledDalton's Lawafter its discoverer, theBritishchemistJohn Dalton,who published it in the first part of the first volume of his "New System ofChemical Philosophy" (1808).The statement of the law is:
If twoelementsform more than onecompoundbetween them, then the ratios of the masses of the second element which combine with a fixed mass of the first element will be ratios of smallwhole numbers.
In chemistry, thelaw of multiple proportionsis one of the basiclawsofstoichiometryused to establish theatomic theory, alongside thelaw of conservation of mass(matter) and thelaw of definite proportions. It is sometimes calledDalton's Lawafter its discoverer, theBritishchemistJohn Dalton,who published it in the first part of the first volume of his "New System ofChemical Philosophy" (1808).The statement of the law is:
If twoelementsform more than onecompoundbetween them, then the ratios of the masses of the second element which combine with a fixed mass of the first element will be ratios of smallwhole numbers.
law of definite proportion,joseph proust
Introduced by,joseph proust
Law of definite proportions
Inchemistry, thelaw of definite proportions, sometimes calledProust's LaworThe Law of Definite Composition, states that achemical compoundalways contains exactly the same proportion ofelementsby mass. An equivalent statement is thelawof constant composition, which states that all samples of a given chemical compound have the same elemental composition by mass. For example,oxygenmakesup about8/9of the mass of any sample of purewater, whilehydrogenmakes up the remaining1/9of the mass. Along with thelaw of multiple proportions, the law of definite proportions forms the basis ofstoichiometry.
History
This observation was first made by theFrenchchemistJoseph Proust, based on several experiments conducted between 1798 and 1804.[2]Based on such observations, Proust made statements like this one, in 1806:
Law of definite proportions
Inchemistry, thelaw of definite proportions, sometimes calledProust's LaworThe Law of Definite Composition, states that achemical compoundalways contains exactly the same proportion ofelementsby mass. An equivalent statement is thelawof constant composition, which states that all samples of a given chemical compound have the same elemental composition by mass. For example,oxygenmakesup about8/9of the mass of any sample of purewater, whilehydrogenmakes up the remaining1/9of the mass. Along with thelaw of multiple proportions, the law of definite proportions forms the basis ofstoichiometry.
History
This observation was first made by theFrenchchemistJoseph Proust, based on several experiments conducted between 1798 and 1804.[2]Based on such observations, Proust made statements like this one, in 1806:
Tuesday, 2 June 2015
Time is a measurement , time is also a length
The Time is Also a length
(In the 3dimentional world,the distance between two points we messured in distance)
O' is a source of light.
t=o
The wave font ,was scattering around O'
(As the same speed of light)
After t' second , the wave font reaching the point p(xyz)
The distance between o' and p' is
Ct*2(s*2) =x*2 + y*2 +z*2
ie,
C*2 t*2 - x*2 -y*2 - z*2 = c*2 t*2- x*2-y*2-z*2
Or
X*2 + y*2+z*2- c*2 t*2= x*2+y*2+z*2- c*2 t*2
Substitute>>>
C*2 t*2= w*2
-c*2 t*2= +w*12
That is w= ict
i= √-1
In the minkowski's 4th dimentional world........
Every points , is called or known as
WORLD POINT and the path of rays is called
World Line
Two world line are
P(x1,y1,z1,w1), Q(x2,y2,z2,w2)
The distance between, PQ = S
then.....,
S*2= ( x2-x1)*2 + (y2-y1)*2+(z2-z1)*2+
(W2-w1)*2
Consider an element of world line
Then,
ds*2 =dx*2+dy*2+dz*2+dw*2
= dx*2+dy*2+dz*2- C*2 dt*2
There for .. " The TIME is also a Measurement "
(In the 3dimentional world,the distance between two points we messured in distance)
O' is a source of light.
t=o
The wave font ,was scattering around O'
(As the same speed of light)
After t' second , the wave font reaching the point p(xyz)
The distance between o' and p' is
Ct*2(s*2) =x*2 + y*2 +z*2
ie,
C*2 t*2 - x*2 -y*2 - z*2 = c*2 t*2- x*2-y*2-z*2
Or
X*2 + y*2+z*2- c*2 t*2= x*2+y*2+z*2- c*2 t*2
Substitute>>>
C*2 t*2= w*2
-c*2 t*2= +w*12
That is w= ict
i= √-1
In the minkowski's 4th dimentional world........
Every points , is called or known as
WORLD POINT and the path of rays is called
World Line
Two world line are
P(x1,y1,z1,w1), Q(x2,y2,z2,w2)
The distance between, PQ = S
then.....,
S*2= ( x2-x1)*2 + (y2-y1)*2+(z2-z1)*2+
(W2-w1)*2
Consider an element of world line
Then,
ds*2 =dx*2+dy*2+dz*2+dw*2
= dx*2+dy*2+dz*2- C*2 dt*2
There for .. " The TIME is also a Measurement "
kingdom protista _ Slime Moulds
Slime moulds are saprophytic protists.the body moves along decaying twings and leaves engulfing organic_meterial . under suitable conditions , they from an aggregation called plasmodium which may grow and spread over several feet. During unfavorable conditions ,the plasmodium differentiates and form fruiting bodies . bearing spores at their tips.
The spores possess true walls.they are extremely resistance and survive for many years. Even under adverse conditions.the spores are dispersed by air currents
The spores possess true walls.they are extremely resistance and survive for many years. Even under adverse conditions.the spores are dispersed by air currents
Subscribe to:
Posts (Atom)