ANswers...
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SET 1
1.d] As E=mc2 represents energy released when the mass m is converted in to energy ; but the principal source of energy obtained in burning is energy released in a chemical reaction and not the energy released due to conversion of mass into energy. Thus, E=mc2 is not useful here.
2.d] The solution is very concentrated, but what matter here is the difference between the concentrations of solute present on the either sides of the semi-permeable membrane. It is kept in isotonic solution means that it has same osmotic pressure as the other solution. Although the osmotic pressure is same on both sides the water exchange may or may not occur, it may occur in such a way that there is no net exchange. So the constraint we get is - initial concs=final conc.s
SET 2
1.d] Because both by wt. & by volume % of water is highest. And for ureotelic organisms, % of urea is highest of those of nitrogenous wastes .
2.d]Each one is a purine.
3.a] Flowers are thought to have evolved from bunches of leaves arranged on the axis. The axis is reduced to form a base like structure- thalamus , so it is a condensed structure.
SET 3
1.d]For charged hollow sphere of radius R ,
-for r<R , E=0 , as there is no charge enclosed inside the sphere so no net electrical flux according to the Gauss' theorem;
- for r=R and r>R , E is not equal to zero, and goes on decreasing as r increases in the manner shown in the graph a] . In graph c] E=o when r<R is not shown .
2.d] inclination= angle made by the line with +ve X-axis.
Let, angle OBA = h , thus tan h = OA/OB = (1)/(3) 1/2 _ _ _ _ _ _ _ _ _ _ _ _ _[ given ration]
thus, h=300 . This is the angle made with -ve X-axis , thus inclination = [180-30]0 = 1500
3.a] Alcohols are neutral, but phenols are slightly acidic and organic acids also contain '-OH' group so, 'b]' is false. The point note is the part other than -OH being the point of difference, may induce difference in the pH properties of the compound.
Major Set 1
BIOLOGY,
Qgr1*
1. b] ADH [ Anti Diuretic Hormone ] , it makes DCT impermeable for water and avoids so called 'doubling'[=diuresis] of urine-volume. Oxytocin helps contraction of uterine wall [ myometrium] and facilitates the birth of baby. Salts can also decrease urine -volume but not to that extent. ADH is a urine reducing hormone , and thus better option be b].
2.b] NADH2 is a reducing agent and thus gets oxidised . Also, NADPH2 is used in photosynthesis, while NADH2 is used in respiration.
3]d] Charge by mass ration is approximately constant for DNA and RNA, thus only DNA cannot be the answer, it is not constant for proteins or hormones naturally. This is due to the major charge contributor is same along the DNA & RNA chains & that too with the same linear density.
Qgr1**
1. Dolphins are secondarily aquatic.
2. In planktonian zone large amounts of sunlight are available
3. Biotechnology applied in the field of agriculture is agrobiotechnology.
Qgr1***
1. SSBP : stabilizing single strand of DNA :: Helicases : uncoiling the DNA helix
2. Cranial nerves : 12 :: Spinal nerves : 33
3. Shark : Elasmobranches :: Platypus : prototheria
Question group 2 [ multiple answers ]
Qgr2*
2. ALL. Different degrees of optic stimulation may lead to different amounts of secretion.
3.b] Only microbiology or only genetics or only gene-engineering or even only exobiology cannot be the answer.
Qgr2**
Maths, Physics & Chemistry.
Question group 1
Qgr1*
1.e] because , K.E. acquired due to P.D. = e [V] = 3eV,
Thus, total K.E.= K [initial K.E.] + 3eV
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
Answer: D}
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 on a table 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.
Answer: C}
2. One year on Mars consists of different no. of days than on Earth, because -
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
3.Answer one of the following-
ii] In summer -
a] intensity of solar radiation increases
b] frequency of solar radiation increases
c] wavelength of solar radiation decreases
d] both 'b]' & 'c]'
e] none of these
LQ 1: Answer one of the following-
1.Give formulae for one dimensional, uniform accelerated motion [ formulae for v, s, and v2]
2. Using equation torque= I [ alpha] prove that ' if external torque is zero then angular momentum is constant ' for a rotating body.
3.Explain , centre of mass of commonly encountered bodies coincides with their centers of gravity.
Qgr1**** ﷲ☺ Minimum solvage is 3 questions.
1.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.
Answer: B}
2.Following graph shows plots of RMS velocities of molecules of H2, 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.
Answer: C}
3.Following are the plots of wave number of radiation emitted by an electron of a hydrogen 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.
Answer: A}
4.In the following graph CURVE b may be represented by y=K/xc 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.
Answer: F}
5.Find ∫2x3/5x dm ,where m=x2
a] x4/5
b] x2/5
c] 2/15 .x2
d] m2/2
Answer: A}
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.
Answer:
a∫b ƒ(t)dt
7.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] All of these
f] both b & d.
g] None of these
Answer: G}
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 √Kag/Kar 'Where Kag= Ka of given acid , Kar = Ka 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.
Answer: A}
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.
Answer: D}
10.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.
Answer: C}
11. For maximum angular acceleration to be produced for a given r and F the angle of application of F is to be-
a]500
b]450
c]00
d] none of these.
Answer: D}
12.For a body performing simple harmonic motion the expression for linear velocity is-
v=-ωxmsinℓ ,where x and ℓ are variables
we know that acceleration a = dv/dt , here a= -ω2xmcosℓ
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.
Answer: D}
13.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 STATEMENTS
a] a, ,c , e only.
b] b, ,c , e only.
c] c, d, e only.
d] c & d only.
e] a & c only.
Answer: E}
14. Following graph shows the how functions of x with general form f(x)={nxm+ kxj + .... + 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.
Answer: A}
15.Followng graph shows how the number individuals of two groups of a animal species showing different characters [Chara. E and G] changed. Then the graphs 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.
Answer: B}
16. 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
Answer: D}
17.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/cough syrup.!-sugr syrp=yrp of sugr:cough syrp:>!!!
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.
Answer: D}
18.Different no. of same double stranded DNA molecules are taken in two different test tubes {Test tube Lb and Rb}. And taq polymerase is added. 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 conc., temp., etc. are applied.
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.
Answer: A}
19.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 2994Nb. 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.
b] the average rate of polypeptide production is in the order A>B>C.
e] both a & b.
f] both c & d.
Answer: D}
20.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.
Answer: D}
21.
In the above graph -
a] Curves A, B are logs to different bases and C is antilog to another base.
b] Curve A, B and C all are logs to different bases.
c] The curves C and B form +ve and -ve side of a parabola respectively.
d] Curve A is log and C is antilog to same base.
e] Curves C & B form half of an ellipse.
Answer: B}
22. 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 tropical area.
e] none of these.
Answer: E}
23.A mixture of artificial AAs [amino acids] is taken and passed through a column containing natural amino acid receptors for all 20 AAs, and 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.
Answer: C}
24. A plasmid named P plasmid is purified and then treated with variety of endonuclease mixtures viz. [A+B] , [A+C] & C. Then the resultant fragments are run on the gel and the following bands are obtained. Identify which is/are the endonuclease / endonucleases used. Click here to see the gel sheet.
a] B only.
b] C then A.
c] B then C.
d] A only.
Answer: C}
25. Find out the true statement-
a] 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.
b] Endonucleases can directly help protein sequencing.
c] Today, DNA sequencing is practically not possible due to difficulties in purification.
d] For DNA sequencing, the method of deducing base-sequence from the gels for enzymatic procedure and endonuclease procedure is the same.
e] both a and d.
f] none of these.
Answer: F}
26. 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'. 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'
Answer: C}
27. 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
Answer: E}
28. Observe the graphs A and B ,
{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 in changing the volume by xml.
iii] integration of curve A + integration of curve B= area of a rectangle with length 25 and breadth 7500.
iv] different lengths of curve B may have same corresponding point in graph A.
the true statement/s is/are-
a] i , iii only.
b] ii, iii only.
c] iv only.
d] i only.
e] ii only.
Answer: C}
29. 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. / males produce diploid and females uniploid gametes. Then if the frequency of individuals
homozygous for character 'a' is 0.027 and that of its only alternative allele 'b' is 0.343.
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
Answer: E}
30. solve any one.
I} 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
Answer: C}
II} 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 by some mechanism
&
50% of the population is male and remaining is female, the population of gametes containing only one 'a' would have been-
a] a2+2ab
b] a2
c] (a2/2)+ab
d](a2/2)+(3/2)ab
Answer: D}
