|
|
Q.1 Define the term denaturation in relation of protein.
Ans1. Disruption of native conformation of a protein due to change in pH, temperature, salts and the likes, is called denaturation.
Q.2 What are the properties of
(i) Ferromagnetics and
(ii) ferroelectrics? Give an example of each type.
Ans2. Ferromagnetic substance are those which show attraction towards external magnetic field and show a permanent magnetism even when the magnetic field is removed. In such substance large number of unpaired electrons aligned in same direction are present.
Example : Fe
Ferroelectric solids are those piezoelectric solids in which permanent dipole present are spontaneously polarised even in the absence of electric field and the direction of polarisation can be changed by applying an electric field.
Example : Barium Titanate (BaTiO3), Rochelle salt.
Q.3 (a) How and where is carbon-14 produced in nature and how it is incorporated into living plant?
(b) Write the principle of radiocarbon dating.
Ans3. (i) Radioactive isotopes carbon-14 is formed by the bombardment of nitrogen in the upper atmosphere by cosmic rays :
147 N + 10 n ——-> 146 C + 11H
The C-14 produced is eventually incorporated into the carbondioxide of air which in turn is incorporated into living plants by the process of photosynthesis and then finds its way into the animal which eats plant.
(ii) The principle of the radiocarbon dating is based on the fact that living matter contains a definite proportion of the radioactive C-14. Once the plant or animal dies, the process of incorporation of carbon stops. And already present ready to decay.
146 C —-> 147 N + O-1e; t1/2 = 5770 years
By knowing the equilibrium concentration of C-14 in a living plant and the concentration of C-14 in a dead piece of organic matter at a particular time, the age of the material can be determined.
Pages: 1 2
|
|
Related pages
Q.1 Write the name and molecular structures of the monomers of the following polymers :
(i) Natural Rubber
(ii) Nylon-66
Ans1. (i) Natural rubber monomer is :
CH3 = CH - CH = CH2
|
CH3 2-methyle-1,3-butadiene (Isoprene)
(ii) Monomers of nylon - 66 are :
H2N-(CH2)6 - NH2 (HexamethyleneDiamine) and HOOC-(CH2)4- COOH(adipic acid)
Q.2 (a) Write a .....
Q 2 In the rock salt structure how many Na+ ions occupy second-nearest neighbour location of a Na+ ion?
Ans. 1 12
Q 3 Which type of hybridisation explains the trigonal bipyramidal shape of SF4 ?
Ans. 2 sp3d
Q 11 Calculate the uncertainity in te velocity of a wagon of mass 3000 kg .....
Q3) Write the IUPAC name of [Ni(CN)4]2- ion. (Marks 1)
Ans3) IUPAC name of [Ni(CN)4]2- ion is tetracyanonickelate (II) ion.
Q4) Write the IUPAC name of : (Marks 1)
O
CH3CCHCH3
.....
Q 1 Write the number of unpaired electron(s) in an atom of an element with the atomic number 21.
Ans. 1 1
Q 3 How many atoms are there in a unit cell of a metal crystallising in fcc structure?
Ans. 2 4
Q 9 In the formula Fe(h5 - (C5H5)2 what does .....
Q 1 What values are permitted for the magnatic quantum number, m for for an electron with angular momentum number, l=2 ?
Ans. 1 When l=2 m=-2 , -1 , 0 , +1 , +2.
Q 3 Name the metal ion with tripositive charge represented by the configuration 1s(2) 2s(2) 2p(6) .....
Q 2 Which one out of O+2 and O-2 is more stable.
Ans. 1 O+2 is more stable because its bond order is higher than O-2.
Q 5 How is the unit of molar conductivity arrived at?
Ans. 2 Molar conductivity (m) = K x 1000 / cm
(m) = ohm-1 cm-1 / moles/cm3
Q .....
Q 1 Mention any two factors which give rise to goodwill of a firm. (Marks 2)
Ans 1 Factors that give rise to goodwill :
(i) Location of the business :
The business which is centrally located in a prominent locality will attract more customers and hence have heavy sale resulting in .....
Q.1 What is the physical significance of the lines in the following depiction of atomic orbitals?
Ans1. Lines encloses the regions in the space around the nucleus where there is maximum probability of finding the electron.
Q.2 An ionic compound AB2 possesses CaF2 type crystal structure.
Write the co-ordination numbers of A2+ .....
Q 1 Define an atomic orbital. What does angular momentum quantum number tell about an orbital ?
Ans. 1 Orbital is three dimensional region in space around the nucleus where probability of finding electron is maximum. Angular memento determine the shape of the orbital.
Q 2 Which one of the two, .....
Q2) Find a matrix X such that A + 2B + X = 0, where
A= 2 -1
3 5
B=-1 1
0 .....
Recently Visited Pages
- History-2000-Set II
Q1. Explain one significant feature of the Pitts India Act.(2marks)
Ans.The Pitts India Act was passed by the British Prime Minister ,William Pitt.in 1784 (.....) - Political Science : 2000 : Set I
Q1. What do you understand by Fascism?
Ans. 1 Fascism is derived from the word 'Fascio' which means an organised political group or a club. (.....) - Geography-2000-Set II
Q1) "India is a sub continent" support this statement by giving three important reasons.
Ans1) Any area which could be distinguished from the rest on the (.....) - Political Science-1999-[ Set- II ]
Q 1. Define Justice. (2 marks)
Ans 1. The word 'Justice' comes from the Latin word 'Jus' which means 'bondage' or 'to bind'. Justice lies (.....) - Chemistry-1997-Set II
Q 1 What values are permitted for the magnatic quantum number, m for for an electron with angular momentum number, l=2 ?
Ans. 1 When (.....) - History-1999-Set III
Q.1. Give any two reasons for the failure of the Marathas in the third battle of Panipat. ( 2 marks)
Ans. The Marathas were defeated in (.....) - Computer Science-1998
Q. 1 (a) Define the following terms : (i) Inheritance (ii) Encapsulation
Ans.1 (a) Inheritance : Inheritance is the process by which one object can acquire (.....) - Physics-1998-Set-III
(Only those questions have been given, which are different from Set I)
Q2) Draw the energy band diagram for a p-type extrinsic semi-conductor. (Marks (.....) - Physic-2000-Set-II
Q1) Draw an equipotential surface for a point charge Q > 0.
(Marks 1)
Ans1) Equipotential surface are the surface of concentric spheres with the (.....) - Maths-1996 -Set I
Q1) Using elementary row transformations, find the inverse of the matrix
A = 4 5
3 (.....) - Accounts -2000-Set II
Q9) X, Y and Z were partners in a firm sharing profits in the proportions of 1/2, 1/3 and 1/6 respectively. The Balance Sheet of (.....) - History-1996-Set III
Q.2. Explain one major step taken by the East India Company to drain the wealth from Bengal after the Battle of Plassey. (2 marks)
Ans. (.....) - Chemistry-1996-Set I
Q1) Write the state of hybridisation of Boron in BCI3. (Marks 1)
Ans1)In BCl3 , Boron is sp2 hybridized.
Q2) What are the coordination numbers of (.....) - Social Science-1999-Set II
Q 3. When and by whom was the Munich Pact Signed? (2)
Ans. 3 Munich Pact was signed in September 1938 by Hitler, Mussolini, Chamberlain & (.....) - Physics-1996-Set II
[Only those questions and answers which are different from set 1 have been given here.]
Q.1.If a rate of change of current of 4 A/s induces (.....)
