Archive for the ‘Class XII Sample Question Papers’ Category

Accounts -2000-Set III

PART ‘A’ (Accounting III)

Q2) What are the alternatives available to a company for the allotment of debentures when there is over-subscription of debentures? (Marks 3)
Ans2) In case of over-subscription of shares :
(i) The company may reject same applications, i.e the application money received is returned back.
(ii) It may not allot any share to some applicants, whereas it may make pro-rata allotment to other applicants.
(iii) It may not allot any share to some applicants, full allotment may be made to some other applicants and pro-rata allotment may be made to the rest.

Q3) P and Q are partners in a firm sharing profits in the ratio 5 : 3. They admitted R and S as a new partner. P surrendered 1/2 of his share in favour of R and Q surrendered 1/4th of his share in favour of S. Calculate the new profit sharing ratio of P, Q, R and S. (Marks 3)
Ans3) P’s sacrifice = 1/2 x 5/8 = 5/16 (R’s gain)
Q’s sacrifice = 1/4 x 3/8 = 3/32 (S’s gain)
P’s new share = Old share – sacrifice
= 5/8 – 5/16 = 5/16
Q’s new share = Old share – sacrifice
= 3/8 – 3/32 = 9/32
… New Profit sharing ratio :
P : Q : R : S
=5/16 : 9/32 : 5/16 : 3/32
= 10 : 9 : 10 : 3


Q.1 Which of the movable joint makes the hip joint ?
Ans1. Ball and socket joint.

Q.2 Write the full form of tRNA.
Ans2. Transfer Ribosenucleic Acid.

Q.3 Mention any two factors by which the environment or the nature checks the pollution size.
Ans3. (i) Competition and struggle.
(ii) Drought and flood.

Q.4 Give two examples of analogous organs from animals.
Ans4. Wings of :
(i) an insect,
(ii) a bird, and
(iii)a bat are analogous organs.

Q.5 Mention one difference in the structure of chlorophyll-a and chlorophyll-b.
Ans5. Chlorophyll-a has a methyl (-CH3) group whereas chlorophyll-b has an aldehyde (-CHO) group.

Q.6 Name the source glands of glucagon and parathormone.
Ans6. Glucagon : Islets of Langerhans in Pancreas
Parathormone: Parathyroid gland

Q.7 Mention one difference between benign tumour and malignant tumour.
Ans7. A malignant tumour is different from a benign tumour in the formers capacity to undergo metastasis.

Q.8 Name any two structures in our body, which bear ciliated epithilium.
Ans8. (i) Kidney tubules, and
(ii) Fallopian tubes


Q1. At what stage the embryo is implanted in the uterus of the mother in case of a test tube baby?
Ans1. 32-celled Morula.

Q2. Human heart is Myogenic yet a parasympathetic nerve can reduce the heart rate. Name the nerve.
Ans2. Vagus Nerve.

Q3. Which of the following diseases could be avoided by analysing the pedegree of parents – Klinefelter’s syndrome, Haemophilia, Amoebiasis.
Ans3. Haemophilia.

Q4. Name the functional contractile unit of the muscle.
Ans4. Sarcomere.

Q5. Name any two synthetic auxins used in agriculture.
Ans5. (i) NAA (naphthaleneacetic acid)

(ii) 2,4 D (2,4-dichlorophenoxyacetic acid)

Q6. What is pulvinus?
Ans6. Pulvinus is the swollen base of the leaf in many members of the bean family. It is responsible for sleep movements.

Q7. Name the fluid in which membranous labyrinth of the inner ear floats.
Ans7. Perilymph.


Q1. What induces parthenocarpy in grapes?
Ans1. Auxins.

Q2. What is the term used for the regions of a gene which become part of mRNA and code for the different regions of the proteins?
Ans2. Exons.

Q3. The venous blood in the lung has a PCO2 of 46 mm Hg. Should the alveolar PCO2 exceed or be less than 46 mm Hg to result in diffusion of CO2 from the blood into the alveolus?
Ans3. It should be less than 46 mm Hg.

Q4. Which part of the plant leaf is modified to form spines of Acacia and the sheath covering the leaf of Ficus elastica.
Ans4. Stipules.

Q5. Name the enzyme that can break and reseal one strand of DNA.
Ans5. Topoisomerase.

Q6. What does J-shaped growth curve of a population indicate?
Ans6. The J-shaped curve indicates that the factors of environmental
resistance do not produce zero growth to contain the exponential growth.

Q7. What forms the cambial ring in a dicot stem during the secondary growth?
Ans7. The cambial rings are formed by alternately forming secondary xylem.

Q8. Name the principal mineral anion in the extracellular fluid.
Ans8. Ca2+.

Biology -1999

Q1. Name the process in which bacteriophage picks-up a piece of DNA from one bacterial cell and transfers the same to another bacterial cell on infection.
Ans1. Transduction.

Q2. Which fraction of soil water is readily available to plants for absorption.
Ans2. Capillary water fraction .

Q3. What protects nitrogenase?
Ans3. ‘Leghemoglobin’ combines with oxygen and maintains anaerobic environment to protect nitrogenase.

Q4. Name two plants that produce rhizomes.
Ans4. Ginger, Turmeric.

Q5. Why is oxytocin called as ‘Birth Hormone’?
Ans5. Oxytocin helps in uterine contraction and the onset of labour at the time of child-birth.

Q6. From which germ layers do the following organs differentiate :
(i) Kidney
(ii) Urinary bladder

Ans6. Kidney and the urinary bladder differentiate from mesoderm.

Q7. What provided energy for abiotic synthesis on the primitive earth?
Ans7. ‘Lightning and solar radiation’ provided energy for abiotic synthesis on the primitive earth.

Q8. Name the two curable sexually transmitted diseases.
(i) Syphilis, and
(ii) gonorrhoea are curable sexually transmitted diseases.


Q 1. What is meant by trisomic condition? (1 mark)
Ans1. Trisomy is the presence of an extra chromosome i.e., so that a particular chromosome is present in three copies.

Q 2. State the presence or absence of sinus venous in a fish and a mammal. (1 mark)
Ans2. Fish and mammals do not have sinus venosus because a sufficiently high blood pressure cannot be maintained in the open spaces.

Q 3. Which type of cartilage is present between vertebrae to allow limited movement? (1 mark)
Ans3. White fibrocartilage

Q 4. Name any two breeds of wild rock pigeon that have been developed through artificial selection. (1 mark)
Ans4. (i) Pouter, and
(ii) Jacobin.

Q 5. Which chromosomes are called autosomes? (1 mark)
Ans5. Autosome is any chromosome other than a sex chromosome. In humans they are 22 pairs.

Q 6. When is a tumour referred to as malignant? (1 mark)
Ans6. A tumour is called malignant, if it has the capacity to undergo metastasis.

Q 7. What are the two factors that contribute for the dissociation of oxyhaemoglobin in the arterial blood to release molecular oxygen in an active tissue? (1 mark)
Ans7. PO2 in the tissues lower than arterial blood, and PCO2 in the tissues higher than arterial blood.

Q 8. Which one of the following is fatal unless oral rehydration therapy is administered :
(i) Whooping cough (ii) Cholera (iii) Tetanus (1 mark)

Ans8. Cholera

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 each of the ions present in the cubic close packed structure of CaF2 at ordinary temperature and pressure? (Marks 1)
Ans2) Coordination Number for Ca2+ is 8 and for F- is 4.

Q3) The rate constant of a reaction is 2 x 10-2 L mol-1 s-1. What is the order of the reaction?
(Marks 1)

Ans3) Order of the reaction is two.

Q4) Give the IUPAC name of the following compound:


CH3 CH3 (Marks 1)
Ans4) The name of the compound is



Q5) Which alkali metal carbonate decomposes on heating to liberate CO2? (Marks 1)
Ans5) Li2CO3

Q6) Name the first element of the 3-d transition metal series.
(Marks 1)

Ans6) Scandium.

Q7) Give the IUPAC name of the linkage isomer of [ (NH3)3 Pt-NO2 ]Cl. (Marks 1)
Ans7) The linkage isomer of [ (NH3)3 Pt-NO2 ]Cl will be [(NH3)3 Pt (ONO)]Cl. It’s IUPAC name is triamminenitritoplatinum(11) chloride.

Chemistry-1997-Set I

Q 1 State the physical significance of 2.
Ans. 1 2 is the measure of probability of finding an electron in the region around the nucleus.

Q.2 Write which one out of O+2 and O–2 is more stable?
Ans. 2 O+2 is more stable as compared to O-2 because bond order of O+2 is 2.5 while that of O-2 is 1.5.

Q 3 Write an expression in the form of a chemical equation for standard enthalpy of formation of for CO?
Ans. 3 C + 1/2 O2(g) —-> CO(g)

Q 4 Write an expression to relate molar conductivity of an electrotype to its degree of dissociation?

Q 5 What is the ‘ambident group’ ? Give an example.
Ans. 5 Ambident group is one which has more than one attacking site for example -C[-]N- is an ambident nuclleophile.

Q 6 Indicate a chemical reaction involving a homogeneous catalyst ?
Ans. 6 SO2(g) + 1/2 O2(g) —————–> SO3(g)

Q 7 Mention two main function of carbohydrates in plants ?
Ans. 7 Two main function of carbohydrates are :
(1) Cellulose is the chief structural material of plants.
(2) Carbohydrates act as energy storing devices of plants.

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 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) 3s(2) 3p(6) 3d(6).
Ans. 2 Chromium (Cr)

Q 4 How is the unit of molar conductivity arrived at ?
Ans. Molar conductivity (m) = K x 1000 / Cm (m) = ohm-1cm-1 / moles/cm3

Q 5 Which one among the following is strongest oxidising agent : ClO4-, BrO4-, IO4-.
Ans. BrO4-

Q 11 Calculate the kinetic energy of moving electron which have wavelength of 4.8 pm. (Mass of electron = 9.11 x 10-31 kg, h = 6.63 x 10-34Js)
Ans. 5 = 4.8 pm = 4.8 x 10-12 m
= h / mv
v = 6.6 x 10-34 Js / 9.1 x 10-31 Kg x 4.8 x 10-12m
= 6.6 x 109 / 9.1 x 4.8
= 0.151 x 109 m/s
= 1.151 x 108 m/s
K.E. = 1/2 mv2
= 1/2 x 9.1 x 10-31 x (1.51 x 108)2
= 1/2 x 20.74 x 1015
= 10.37 x 1015 J

Chemistry-1997-Set III

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 6 Which one among the following is strongest oxidising agent : ClO4-, BrO4-, IO4-
Ans. 3 BrO4-

Q 12 The solubility of Ba(OH)2.8H2O in water at 288k is 5.6 g per 100 g of water. What is the molality of the hydroxide ions in the saturated solution of barium hydroxide at 288k? (Atomic mass : Ba=137, O=16, h=1)
Ans. 4 WB = 5.6 g , WB = 100 gm = WB. 100 / MB.WB
= 5.6 x 1000 / 315 x 100 = 0.17
Molarity of Ba(OH) 2.8 H2O = 0.17
Since, one mole Ba(OH) 2.8 H2O will finish two moles of OH- ions.
Molarity of OH- ion = 2 x 0.17 = 0.34 m

Q 16 Consider the following data for the reaction : A + B —–> Products.
Run Initial Conc Initial Conc Initial rate(mols-1)
1 0.10M 1.0M 2.1×10-3
2 0.20M 1.0M 8.4×10-3
3 0.20M 2.0M 8.4×10-3

Determine the order of reaction with respect to A and with respect to B, and the over all order of the reaction.
Ans. Divide Expt. No. (i) and (ii) K [A] [B] = rate of reaction
K[0.20] [1.0] /K[0.10] [1.0] = 8.4 x 10-3/2.1 x 10-3
2 =4 or 2=22 or = 2
So order w.r.t A=2
From Expt.No.(ii) and (iii) it is clear that rate of reaction does not change
in concentration of B, So order W.r.t. B is 1, i.e Rate = k[A]2 [B]o
over all order of reaction = 2

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