Monthly quiz!

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 Knowledge Unites Cultures...

Quiz!    

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Marking system:

Correct ans- +10pts            max. score :390pts

Wrong ans-  0pts                 min score : 0pts

ANSWERS! & score interpretations.

GOOD LUCK !

SET1

Grad1.  If a block of wood of 3kg is burnt , then the energy obtained is [ c=300000000m/s]

     a] 900000000m/s

b] 2700000000m/s

c]2650000000J

d] Data insufficient

e] None of these.

   Grad2. A  cell contains fluid that is so concentrated that it is hypertonic to many solutions  . If it is kept in isotonic solution, it will-

    a] burst

   b] shrink

   c] water exchange will not occur

   d] no net water exchange will  take place

   e] both c] & d]

 Grad3. In the urine of  ureotelic organisms , the % of _ _ _  is the highest.

 Choose the appropriate word to complete the sentence.

a] urea

b] ammonia

c] guanine

d] none of these

 4.Which is not a purine-

a] inosine

b] adenine

c] uric acid

d] none of these

Grad5. Flower  is a condensed shoot , because -

a] it is equivalent to condensed bunch of leaves

b] it looses water  during day

c] it has low temperature than the other parts of the plant

d] all of these

SET 2

1. Which is the graph of intensity versus distance from the centre , for a charged hollow sphere , of the following-

a]

b]

c]

d] both a and c .

2. In triangle AOB,  y-co-ordinate of A is { (1)/(3) ^1/2 } times that of  x- co-ordinate of B. Then , the inclination of line AB is-

a] 60⁰

b]30⁰

c] 120⁰

d] none of these

3. Choose the true statement-

a] Alcohols are neutral

b] all the compounds having -OH group/s are neutral

c]  phenols [ cyclic  compounds with -OH group] are neutral.

d] all of these

               Major SET 1

Question group 1

Qgr1*

1.Mr.X was given two liters of water to drink. Then some chemical was injected in his blood.

 Then the volume of urine excreted was much lesser  than the output without the injection noted previously in exactly the same conditions.

The injection probably contained-

a] Salts

b] ADH

c] Oxytocin

d] Urine reducing hormone

2. Which is a true statement-

a] NADH₂ gets oxidized in photosynthesis

b] NADH₂ gets oxidized in respiration.

c] NADH₂ gets reduced in photosynthesis

d] NADH₂ gets  reduced in respiration.

e] Both a & b

3. Charge by mass ration is approximately constant for -

a] Peptides only

b] Hormones only

c] DNA only

d] none of these

Qgr1**

1. Dolphins are _ _ _ ly aquatic.

2.  In planktonian zone _ _ _ amounts of sunlight are available

3. Biotechnology applied in the field of agriculture is _ _ _.

4. SSBP : stabilizing single strand of DNA :: Helicases : _______

5. Cranial nerves : 12 :: Spinal nerves : _______

6. Shark : Elasmobranches :: Platypus : ______

Question group 2 [ multiple answers may be present !!! ]

Qgr2*

1. Choose the false statement -

a] There is no any relation between geology and biology.

b] There is some  relation between biology and physics.

c] There is  some relation between math and biology.

d] There is some relation between chemistry and biology.

2. The secretion of  some hormone is stimulated by light. So, its secretion may differ in-

a] total blinds and normal people

b] people blind with one eye and normal people

c] people with less visible ability [but having two eyes ] and normal people

d] people living mostly in dark and normal people

e] people living under light in the night also, and normal people

f] people having one normal  and one eye with less visible ability  & normal people

Grad3.Study  of  using genetic engineering  in order to develop the ability to live in some specific conditions in space and  on other planets in algae, is included in-

a] microbiology only

b] exobiology

c] genetics only

d] genetic engineering only

e] both c and d

A} Give reason- The some molecules of DNA in commonly used electrophoretic apparatus form a band near the same mark on the ladder.

B} Probability of finding some gene in the given genome of species A is 2/5 , so find  in a population of 1000 individuals of that species , the gene frequency of that gene is ???

C} Explain , centre of mass of commonly encountered bodies coincides with their centers of gravity.

Physics

1.An electron is accelerated through the potential difference of 3V , the kinetic energy aquired by it is-[ V = P.D. ], its initial kinetic energy is K.

a] [1/2]mV² 

b] Ö (2eV/m)

c] 3eV

d] Ö (6e/m)

e] none of these

2. For a  solid  charged  sphere, which is the graph that represents variation of E [ electric field ] as a function of   r  [ radius of the solid sphere ] if other factors are constant and for the points inside the sphere -

a]

b]

c]

d] None of these

3.If two springs have same spring constant [k = 3N/m]  & have same mass m tied to their ends then if one of them  is held horizontally and stretched up to the distance x  and then allowed to perform S.H.M., and the another is held vertically and allowed to perform S.H.M. on its own, let its amplitude be y. If  the ration [y/(amplitude of first spring)] is 2:1 , find the mass attached to them in terms of x is -

 [ assume g=10m/s² ]

a] 3x/10

b] 3x/20

c] 6x/10

d] data insufficient.

Grad4.One  year on Mars consists of  different no. of days than on Earth, because -ARable

a] time is either faster or slower there

b] duration of a day is different

c] duration of one revolution around sun is different

d] It is the fault of our clocks which get disturbed due to magnetic field of Mars there.

e] both b & c

Grad5.In summer -

a] intensity of solar radiation increases

b] frequency of solar radiation increases [ 'Doppler increase' in 'n' ]

c] wavelength of solar radiation decreases

d] both 'b]' & 'c]'

e] none of these

Qgr1****    ☺ Minimum solvage is 1/4  questions.

Grad1.From the given graph-

a] Slope of curve of m versus v is always greater than 1.

b] Slope of curve of m versus v is always less than 1.

c] Slope of curve of m versus v is initially less than 1 and then approaches 1.

d] Slope of curve of m versus v initially greater than 1 and then approaches infinity.

2.Following graph shows plots of RMS velocities of molecules of H_2, He , SO₂ & H₂0 versus absolute temperature; then

a] Series 1 represents the plot for He.

b] Series 2 represents the plot for H₂0.

c] Series 3 is the plot for SO₂ .

d] Series 4 is the plot for H.

3.Following are the plots of wave number of radiation emitted by an electron of a hydrogen like species atom versus  orbit number [n]  it falls from to the respective orbit, while radiating. Then

a] A Part of Series2 corresponds Lyman series.

b]  Series4 corresponds Balmer series.

c] Series 4 & 5 are false as they have negative values too.

d] All the three series are false as they intersect X-axis.

Grad4.In the following graph CURVE b may be represented by y=K/x^c where K and c are constants.

Then...

a] The graph is an isotherm (P versus V).

b] The graph is T versus V for adiabatic conditions.

c] The graph is P versus V for adiabatic conditions.

d] both b and c.

e] The graph is field of super magnets versus distance from them.

f]  either b or c.

g] NONE OF THESE

5.Find ∫2x³/5x dm ,where  m=x²

a] x⁴/5

b] x²/5

c] 2/15 .x²

d] m²/2

e] can't be integrated for dm.

6. Following is the graph of velocity of a body as a function of time, find the expression for total displacement in terms of t.

Grad7.A rectangle with length n and breadth m can be transformed into  a square of length n and breadth n in order to ease the calculations , by shifting the origin and changing the scale.

If the co-ordinates of a point in the present system are (x,y)  then the newly defined   scales {X,Y} are

a] Y=y, X=x-[m-n]

b] X=y ,Y=y

c] Y=x , X=y

d] Y=(y+0) , X=(x)/(m)

e] Y={(y+0) -3}, X={[(x.n)/(m)]-3}

 f] All of these

g] both b & e.

h] None of these.

8.H1, H2 and H3 are three different organic acids. Taking different acids as reference , the ratio of strength of given acid and the reference acid are calculated using √K_ag/K_{ar '}Where K_ag= K_a of given acid , K_ar = K_a of reference acid.

The following graphs are  drawn taking H1, H2 and H3 respectively as reference acids. Then  the information specifically the graph reveals is-

a] strength order of acids is  H1>H3>H2

b] pH of H1 >pH of H2>pH of H3

c] pOH of H3 > pH of H2 < pOH of H1

d] strength order of acids is H2<H3<H1

e] both b and c.

9.If y=f(x)=1/x, such that y=ƒ'(x) .Observe the following graphs-

Series no.                   5                 6                  7                    8      

           1]                  ƒ(x)              ƒ'(x)             ƒ''(x)               ƒ'''(x)

           2]                 ∫ydx                y               dy/dx               d²y/dx² 

             3]          {∫[∫(y')dx]dx}      ∫y'dx               y'                 dy'/dx 

           4]                   y               dy/dx            d²y/dx²              d³y/dx³ 

              5]                    ƒ(x)                -[ƒ(x)]²         [ƒ(x)]³             -[ƒ(x)]⁴

The true matching is-

 a] 1, 2 only.

 b] 2 , 3 and 5 only.

 c] 4  only.

 d] 1,2 & 3 only.

 e] either 4 or 5.

 f]  all are true.

Grad10.Following is the graph of Force versus distance from the axis of rotation of thr point of application of force such that on every point on the curve the resultant angular acceleration is the same. The graph directly reveals that-

a] The maximum force will produce maximum angular acceleration.

b]  The maximum r will produce maximum angular acceleration.

c] In order to minimize the force to be applied we have to apply it at a distant point.

d][ all of these.

Grad12.For a body performing simple harmonic motion the expression for linear velocity is-

  v=-ωx_msinℓ ,where x and  ℓ are variables

we know that acceleration a = dv/dt  , here a= -ω²x_mcosℓ

Then the change in the power of ω in the expression of a shows-

i] ω is also a variable.

ii] the motion has become non-uniform accelerated motion as ω varies

iii] the motion is not a simple harmonic motion as ω varies.

iv]  ℓ depends on ω.

the true ones  is/are-

a] i, ii, iii, iv only

b] i, iii , iv only

c] iii, iv only

d] iv only.

Grad13.Following is the graph of resonant frequencies versus the length of air column, then-

     a] The harmonics for which this graph can be drawn are odd ones only

     b] The harmonics for which this graph  can be drawn are  even ones only

     c] Line A is for the pipe with both ends open.

     d] The graph can be drawn for both odd as well as even harmonics produced.

     e] Line B is for the pipe with both the ends closed.

     GIVE THE ADDRESS OF CORRECT STATEMENT/S

a] a, ,c , e  only                         

b] b, ,c , e only

c] c, d, e only

d] c & d only

e] a & c only

Grad14. Following graph shows the how  functions of x with  general form {nx^m+ kx^j + .... + bx + C ; n, m, j, k and C are constants.} vary with x.

a] Function S has the highest power of x

b] function P has the highest power of x

c] slope of only P is a constant

d] No function contains a constant quantity [C].

e] Slope of no function contains a constant in it.

Grad15.Followng graph shows how the number individuals of two groups of an animal species showing different  characters [Chara. E and G] changed. Then the time wise plot of the gene-frequencies of those characters...

a] should necessarily resemble  that for sub-population changes as in a given chromosome either the allele for E or that for  G  can be present.

b] may not resemble that for sub-population changes  as the gene may be inactively present in the sub-population that is naturally selected. _[as diploid,so, it may be dominns, epistasis , etc.]

c]  The graph of the gene-frequencies for E should necessarily resemble that for whole population.

d] The graph of the gene-frequencies for D should necessarily resemble that for whole population.

Grad16. Curves show the variation of logs to different bases A & B .Mark the true statement

a] (A/B)=1

b] (A/B)-1>0

c] (A/B)+1≤0

d] (A/B)²-(A/B)<0

Grad17.Graph shows the sympathetic activation by some drink  A. Observing it we can say-

i] A may be tea.

ii] A may be common cold syrup.

iii] A may be diet coke.

iv] A may be coke.

a] i, ii, iv only

b] i, iii, iv only

c] i, ii, iii only.

d] all i, ii ,iii & iv.

Grad18.Different no. of identical double stranded DNA molecules are taken in two different test tubes {Test tube Lb and Rb}. And taq polymerase soup . Following  graph shows how the population of these two disconnected systems of DNAs vary with their generation number such that no selective pressures like low enzyme or nitrogen base supply, temp., etc. are applied in equivalent magnitudes.

When the population of both of these reaches 980 strands -

a] the no. of new DNA strands produced in Lb > that of new DNA strands produced in Rb.

b] the no. of new DNA strands produced in Lb < that of new DNA strands produced in Rb.

c] the no. of new DNA strands produced in Lb = that of new DNA strands produced in Rb.

d] the no. of   new DNA strands produced in Rb < that of  DNAs produced in Lb.

e] both a &d.

f] the no. of   new DNA strands produced in Rb > that of  DNAs produced in Lb.

Grad19.At time=t₀ a polysome of 3 ribosomes [ namely RbA, RbB & RbC  with unknown order] starts translating an mRNA of length 3000Nb. At time= t₁ A has produced an AA chain of length 1000AA.B has produced that of 999AA while C has covered 994Nb. then-

a] The order in which Rbs began translating the mRNA is C, A, B.

b] the average rate of polypeptide production is  in the order C>A>B.

c] The order in which Rbs began translating the mRNA is  A, B, C.

d] the average rate of polypeptide production is  in the order A>B>C.

e] both a & b.

f] both c & d.

Grad20.Consider a double stranded DNA which duplicates in time t1. Then, in this process, the time required for one of its strands to replicate is approximately-

a] t1/3

b] t1/4

c] t1/2

d] t1

e] >t1 as it takes time to brake the strands.

Grad22. For a double stranded DNA molecule, the temperature required to separate its two strands is-

a] greater if its T+A content is greater.

b] greater if its C+A content is constant.

c] greater if its G+C content is lesser.

d] greater if it is a DNA of an organism living in desert.

e] none of these.

Grad23. A mixture of artificial AAs [amino acids] is taken and passed through a column containing natural amino acid receptors for all 20 AAs,the care is taken that all unbound AAs are removed as filtrate; the filtrate is then kept in flask F. Then we can definitely say that-

a] % of L-AAs is 100% in F.

b] % of D-AAs is 100% in F.

c] % of D-AAs is 0% in the column.

d] Both b and c. 

Grad24. A plasmid named P plasmid is purified and then treated with variety of endonuclease mixtures viz. [A+B] , [A+C] & C. [A, B & C all have non-identical sites of cut.] Then the resultant fragments are run on the gel and the following bands are obtained. Identify which is/are the endonuclease / endonucleases used in the last degradation by an unknown mixture [no other endonuclease than A , B or C is used].  Click here to see the gel sheet.

a] B only.

b] A+B+C.

c] B then C.

d] A only.

Grad25. Find out the true statement-

i] DNA sequencing can be done using DNA made up of radioactive bases {A, T, G & C} for help in detection  and endonucleases for cutting it into fragments.

ii] Endonucleases can directly help protein sequencing.

iii] Today, DNA sequencing is practically not possible due to difficulties in purification.

iv] For  DNA sequencing, the method of deducing  base-sequence from the gels for enzymatic procedure and endonuclease procedure  is  the same.

v] DNA sequencing can be an economical and more accurate alternative for DNA fingerprinting.

.

a] i, ii, v only.

b] i, iv, v only.

c] iii only

d] i, ii, iv, v only.

e] none is true.

Grad26. DNA from a specific gene locus is extracted from two sources - strain A and strain B.

Then these purified gene extracts A and B are separately treated with some chemicals and an endonuclease E which cuts out the sequence 5' AACCTTGGAACC 3'[ to give ATP, CTP, GTP, TTP etc..] Then the fragments obtained show length polymorphism. Then these are separately exposed to a probe. The polymorphism of these fragments is not detected -

a] If the probe has sequence   5' AACCTTGGAACC 3'

b] If the probe has the sequence 3' AACCTTGGAACC 5'

c] If the probe has the sequence 3' TTGGAACCTTGG 5'

d] If the probe has the sequence 5' TTGGAACCTTGG 3'

e] In any case length polymorphism can't remain hidden.

Grad27. "HARDY-WEINBERG EQUILIBRIUM EXISTS.[no bias]" -For a population of a diploid organism gene G has only three alternative alleles viz.  a, b & c. The number of each possible type of heterozygous individuals is the same.

Then the  frequency of gametes having c allele in the given population is-

a]0

b]1/2

c]o.33

d]1

e] 2/9

Grad28. Observe the graphs A and B , and choose the correct statement/s.

                                        {A}

                                      {B}

i] The area under the part of curve B that corresponds to given P and V change is equal to integration of the function in graph A w.r.t. the independent variable in graph A.

ii] Same amount of work is done for same volume change.

iii] integration of curve A + integration of curve B= area of a rectangle wich is the max. work done in the process.

iv] different lengths of curve B may have same corresponding point in graph A.

a] i , iii only.

b] ii, iii only.

c] iv only.

d] i only.

e] ii only.

Grad29. Imagine that on planet X , a species Z is evolved in such a way that the only difference between its individual and an eukaryotic diploid mammalian individual on earth is that its normal ploidy is triploidy such that each individual produces,  by some mechanism, uniploid gametes.

and gametes from 3 parents with 3 different sexes would produce a new individual.  Then if the frequency of individuals homozygous for  character 'a' is 0.027 and that of its only alternative allele 'b' is 0.343. ____________"HARDY-WEINBERG EQUILIBRIUM EXISTS. [no bias]"

Then the number of  individuals having two 'a' & one 'b' allele is.

a]0

b]0.00025

c]o.33

d]1

e] 0.189

30. solve any one.

GradI} In the above population if only the frequency of individuals showing character 'b' would have been given to be 0.027 such that allele 'a' is dominant over allele 'b', the frequency of allele 'a' would have been-

a]0.2

b]0.027

c]0.7

d]0.973

GradII} For the organism referred in Q.29  if instead of 3 sexes only two sexes would have been present such that males produce diploid while females produce uniploid gametes &

50% of the population is male and remaining is female, the population of gametes containing only one 'a' allele would have been-

{a= frequency of allele 'a'  b= frequency of allele 'b.'}

a] a²+2ab

b] a²

c] (a²/2)+ab

d](a²/2)+(3/2)ab

Conclude.

Grad1.A Scientist obtained proteins from three different organisms of three different species namely prot.A from organism A, prot.B from B, prot.C from C, prot.D from D   and prot.E from E, all of same length.

These 5 prots are suspected to be evolved from same ancestral polypeptide.

Then the scientist sequenced the proteins and obtained the following data:

What can we tell from  this data about the evolutionary relationships for  the possible 10 pairs of these organisms.

Justify

Grad2. A mutation in gene horZPX-334 is seen in a mammal wile the probable cause was exposure to cosmic radiation. This gene leads to formation of an endocrine hormone by gland G. This hormone targets the adipose tissue cells. This mutation will a definitely affect the physiology of that individual if-

a] it is in blood cells

b] it is in G-gland cells

c] it is in the adipose tissue

d] in the germa.

How many of these are correct statements? Justify.

Trick it out!!!

-

Grad1.There are 3 clones of cells given. In the medium monomers of chemical A, B and C are present which under specific set of conditions [set P] condense to form dimers. When these three clones[ k1, k2 & k3] are grown in the presence of the monomers of A , B and C  they undergo a change  T under the conditions defined by set P.  Especially the dimers are known to be essential for the change T. But which dimer/s initiate/s this process in a given clone is not known. If it is same for all clones or not is also unknown.

Design an outline of an experiment to find it out.

Grad2. In the natural environment when the condition set D is operating, a cellular activity  Ac10x is observed. Following table lists some processes to obtain diff. components. The condition sets neither positively nor negatively affect Ac10x directly. Whatever the effect of the condition sets on Ac10x is observed is only by means of the components it generates when P and Q are supplied.  It is known that some substances consisting of P, or Q or both P & Q are essential for this activity.

Give guidelines for an experiment to find out which is/are these substances.

Grad3. If we redefine magnitude of force as F=m²a  and that of Kinetic energy gained by the body  work done by this force as K.E.=(1/2)mv³= w . Now , in the light of the relationship F.S=W,

Get the expression for S in terms of m, v & a considering the new definition of K.E.

Justify your substitutions.

Grad4.For a family of functions in the form i^pv , where i= root of -1, v is a constant , p is power of i & the variable here. Design a function of the same family which will be always non-real when a function f=i^pk is real,

choose-

a] g=i^1-pk

b] g=i^p+1 [i*f]

c]g=i^2p+1 [i*f]

d]g=i^p+1 [√-1*k³ⁱ]

e] all of these.

ans. A} (i*f ) isn't const. &  (√-1*k³ⁱ)  isn't  real, but the function should belong to the same family...

Grad28