done AIIMS Solved Paper-2007 Total Questions - 200
question_answer1) If the cold junction of a thermocouple is kept at \[{{0}^{\text{o}}}C\] and the hot junction is kept at \[{{T}^{o}}C,\] then the relation between neutral temperature \[({{T}_{n}})\] and temperature of inversion \[({{T}_{i}})\] is
question_answer3) A particle starting from the origin (0, 0) moves in a straight line in the (x, y) plane. Its coordinates at a later time are \[(\sqrt{3},\,3)\]. The path of the panicle makes with the x-axis an angle of
question_answer4) The resistance of an ammeter is 13\[{{i}_{2}}>{{i}_{3}}>{{i}_{1}}\]. and its scale is graduated for a current upto 100 A. After an additional shunt has been connected to this ammeter it becomes possible to measure currents upto 750 A by this meter. The value of shunt resistance is
question_answer5) The primary and secondary coils of a transformer have 50 and 1500 turns respectively. If the magnetic flux \[\beta \] linked with the primary coil is given by \[\beta \], where \[k\Omega \] is in weber, t is time in second and \[\mu F\] is a constant, the output voltage across the secondary coil is
question_answer6) A particle executes simple harmonic oscillation with an amplitude a. The period of oscillation is T. The minimum time taken by the particle to travel half of the amplitude from the equilibrium position is
question_answer7) In the energy band diagram of a material shown below, the open circles and filled circles denote holes and electrons respectively. The material is a/an
question_answer8) Two radioactive substances A and B have decay constants 5\[\mu k\] and \[\mu k\] respectively. At t = 0 they have the same number of nuclei. The ratio of number of nuclei of A to those of B will be \[{{\left( \frac{1}{e} \right)}^{2}}\] after a time interval
question_answer10) A particle of mass m moves in the XY plane with a velocity v along the straight line AB. If the angular momentum of the particle with respect to origin o is \[\rho \] when it is at A and \[\lambda \] when it is at B, then
A)
\[\frac{\sigma }{\rho \lambda }\]
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B)
\[\frac{\rho }{\sigma \lambda }\]
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C)
the relationship between \[\frac{\lambda }{\sigma \rho }\] and \[\rho \lambda \sigma \] depends upon the slope of the line AS
question_answer11) A mass of 2.0 kg is put on a flat pan attached to a vertical spring fixed on the ground as shown in the figure. The mass of the spring and the pan is negligible. When pressed slightly and released the mass executes a simple harmonic motion. The spring constant is 200 N/m. What should be the minimum amplitude of the motion, so that the mass gets detached from the pan?(Take \[g=10\,m/{{s}^{2}}\])
question_answer12) A beam of electrons passes undeflected through mutually perpendicular electric and magnetic fields. If the electric field ii switched off, and the same magnetic field is maintained, the electrons move
question_answer13) A common emitter amplifier has a voltage gain of 50, an input impedance of 100\[({{T}_{n}})\] and an output impedance of 200\[{{T}_{i}}-{{T}_{n}}={{T}_{n}}-T\]. The power gain of the amplifier is
question_answer15) Dimensions of resistance in an electrical circuit, in terms of dimension of mass M, of length L, of time T and of current I, would be
question_answer16) Specific rotation of sugar solution is 0.01 Sl units. \[200\,kg\,-{{m}^{-3}}\] of impure sugar solution is taken in a polarimeter tube of length 0.25 m and an optical rotation of 0.4 rad is observed, The percentage of purity of sugar in the sample is
question_answer17) When a body falls in air, the resistance of air depends to a great extent on the shape of the body. Three different shapes are given. Identify the combination of air resistances which truly represents the physical situation? (The cross-sectional areas are the same).
question_answer18) A beam of parallel rays is brought to focus by a plano-convex lens. A thin concave lens of the same focal length is joined to the first lens. The effect of this is
A)
the focus shifts to infinity
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B)
the focal point shirts towards the lens by a small distance
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C)
the focal point shifts away from the lens by a small distance
question_answer20) The figure below shows the plot of \[\Omega \] versus p for oxygen gas at two different temperatures. Read the following statements concerning the above curves (i) The dotted line corresponds to the ideal gas behavior (ii) \[\Omega \] (iii) The value of\[\Omega \]at the point where the curves meet on the y-axis is the same for all gases. Which of the above statements is true?
question_answer21) A ray of light is incident on the surface of a glass plate of thickness f. If the angle of incidence Q is small, the emerging ray would be displaced side ways by an amount [Take n = refractive index of glass)
question_answer22) An asteroid of mass m is approaching earth, initially at a distance of 10 \[\phi \] with speed \[{{\phi }_{0}}\]. It hits the earth with a speed \[\frac{T}{4}\] and \[\frac{T}{8}\], are radius and mass of earth), then
question_answer23) The figure shows three situations when an electron with velocity \[{{\left( \frac{1}{2} \right)}^{2}}\]travels through a uniform magnetic field \[\frac{1}{4\lambda }\]. In each case, what is the direction of magnetic force on the electron?
question_answer24) In the figure, a proton moves a distance d in a uniform electric E as shown in the figure. Does the electric field do a positive or negative work on the proton? Does the electric potential energy of the proton increase or decrease?
question_answer25) The figure shows three circuits with identical batteries, inductors and resistance. Rank the circuits according to the currents through the battery just after the switch is closed, greatest first.
question_answer26) The figure shows the path of a positively charged particle 1 through a rectangular region of uniform electric field as shown in the figure. What is the direction of electric field and the direction of deflection of particles 2, 3 and 4?
question_answer27) A spherical ball of mass 20 kg is stationary at the top of a hill of height 100 m. It roils down a smooth surface to the ground, then climbs up another hill of height 30 m and finally rolls down to a horizontal base at a height of 20 m above the ground. The velocity attained by the ball is
question_answer28) The energy spectrum of \[\frac{qv{{R}^{2}}}{2}\]-panicles [number N(E) as a function of \[qvR\]-energy E] emitted from a radioactive source is
question_answer30) A parallel plate capacitor is made by stacking n equally spaced plates connected alternatively. If the capacitance between any two adjacent plates is C, then the resultant capacitance is
question_answer31) In a detector, output circuit consists of R = 10\[{{L}_{A}}\] and C = 100\[{{L}_{B}}\]. The frequency of carrier signal it can detect is
question_answer33) A six pole generator with fixed field excitation developes an emf of 100 V, when operating at 1500 rpm. At what speed must it rotate to develop 120 V?
question_answer34) Energy from the sun is received on earth at the rate of \[2\,\,cal\,per\,c{{m}^{2}}\] per min. If average wavelength of solar light be taken at 5500 A then how many photons are received on the earth per cm2 per min? \[{{L}_{A}}>{{L}_{B}}\]
question_answer35) An X-ray pulse of wavelength 4.9 \[{{L}_{A}}={{L}_{B}}\] is sent through a section of Wilson cloud chamber containing a super saturated gas, and tracks of photoelectron ejected from the gaseous atoms are observed. Two groups of tracks of lengths 1.40 cm and 2.02 cm are noted. If the range-energy relation for cloud chamber is given by \[R=\alpha \,E\] with \[{{L}_{B}}\] = 1 cm/keV, obtain the binding energies of the two levels from which electrons are emitted. Given\[h=6.63\,\times {{10}^{-34}}\,J-s,\,\,e=1.6\times {{10}^{-19}}J\].
question_answer37) We have seen that a gamma-ray dose of 3 Gy is lethal to half the people exposed to it. If the equivalent energy were absorbed as heat, what rise in body temperature would result?
question_answer38) Mass spectrometric analysis of potassium and argon atoms in a Moon rock sample shows that the ratio of the number of (stable) \[\pi \] atoms present to the number of (radioactive) \[\pi \] atoms is 10.3. Assume that all the argon atoms were produced by the decay of potassium atoms, with a half-life of \[1.25\times {{10}^{9}}\,yr\]. How old is the rock?
question_answer40) The speed (v) of ripples on the surface of water depends on surface tension (\[\frac{pV}{nT}\]), density (\[{{T}_{1}}>{{T}_{2}}\]) and wavelength (\[\frac{pV}{nT}\]). The square of speed (v) is proportional to
question_answer41) Assertion: A ladder is more apt to slip, when you are high up on it than when you just begin to climb. Reason: At the high up on a ladder, the torque is large and on climbing up the torque is small.
A)
If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion
doneclear
B)
If both Assertion and Reason are true but the Reason is not the correct explanation of the Assertion
question_answer42) Assertion: Water in a U-tube executes SHM, the time period for mercury filled up to the same height in the U-tube be greater than that in case of water. Reason: The amplitude of an oscillating pendulum goes on increasing.
A)
If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion
doneclear
B)
If both Assertion and Reason are true but the Reason is not the correct explanation of the Assertion
question_answer43) Assertion: in taking into account the fact that any object which floats must have an average density less than that of water, during world war I, a number of cargo vessels are made of concrete. Reason: Concrete cargo vessels were filled with air.
A)
If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion
doneclear
B)
If both Assertion and Reason are true but the Reason is not the correct explanation of the Assertion
question_answer44) Assertion: A portable AM radio set must be kept horizontal to receive the signals properly. Reason: Radio waves are polarized electromagnetic waves
A)
If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion
doneclear
B)
If both Assertion and Reason are true but the Reason is not the correct explanation of the Assertion
question_answer45) Assertion: If earth did not have atmosphere, its average surface temperature would be lower than what is now. Reason: Green house effect of the atmosphere would be absent if earth did not have atmosphere.
A)
If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion
doneclear
B)
If both Assertion and Reason are true but the Reason is not the correct explanation of the Assertion
question_answer48) Assertion: The knowledge of Albedo helps us to estimate the atmosphere of a planet. Reason: The clouds are not good reflectors of light.
A)
If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion
doneclear
B)
If both Assertion and Reason are true but the Reason is not the correct explanation of the Assertion
question_answer49) Assertion: The energy gap between the valence band and conduction band is greater in silicon than in germanium. Reason: Thermal energy produces fewer minority carriers in silicon than in germanium.
A)
If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion
doneclear
B)
If both Assertion and Reason are true but the Reason is not the correct explanation of the Assertion
question_answer50) Assertion: The pattern and position of fringes always remain same even after the introduction of transparent medium in a path of one of the slits. Reason: The central fringe is bright or dark does not depend upon the initial phase difference between the two coherence sources.
A)
If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion
doneclear
B)
If both Assertion and Reason are true but the Reason is not the correct explanation of the Assertion
question_answer51) Assertion: A biconvex lens of focal length 10 cm is split into two equal parts by a plane parallel to its principal axis. The focal length of the each part will be 20 cm. Reason: Focal length does not depend on the radii of curvature of two surfaces.
A)
If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion
doneclear
B)
If both Assertion and Reason are true but the Reason is not the correct explanation of the Assertion
question_answer52) Assertion: The acceleration of a body down a rough inclined plane is greater than the acceleration due to gravity. Reason: The body is able to slide on a inclined plane only when its acceleration is greater than acceleration due to gravity.
A)
If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion
doneclear
B)
If both Assertion and Reason are true but the Reason is not the correct explanation of the Assertion
question_answer53) Assertion: Transmission Electron Microscope (TEMJ provides two dimensional images. Reason: Scanning Electron Microscope (SEM) provides three dimensional images.
A)
If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion
doneclear
B)
If both Assertion and Reason are true but the Reason is not the correct explanation of the Assertion
question_answer54) Assertion: While measuring the thermal conductivity of liquid experimentally, the upper layer is kept hot and the lower layer is kept cold. Reason: This avoids heating of liquid by convection.
A)
If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion
doneclear
B)
If both Assertion and Reason are true but the Reason is not the correct explanation of the Assertion
question_answer55) Assertion: The temperature of the surface of the sun is approximately 6000 K. If we take a big tens and focus the sun rays, we can produce a temperature of 8000 K. Reason: This highest temperature can be produced according to second law of thermodynamics.
A)
If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion
doneclear
B)
If both Assertion and Reason are true but the Reason is not the correct explanation of the Assertion
question_answer57) Assertion: Ocean waves hitting a beach are always found to be nearly normal to the shore. Reason: Ocean waves hitting a beach are assumed as plane waves.
A)
If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion
doneclear
B)
If both Assertion and Reason are true but the Reason is not the correct explanation of the Assertion
question_answer58) Assertion: The lightning conductor at the top of high building has sharp pointed ends. Reason: The surface density of charge at sharp points is very high resulting in setting up of electric wind.
A)
If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion
doneclear
B)
If both Assertion and Reason are true but the Reason is not the correct explanation of the Assertion
question_answer59) Assertion: Two short magnets are placed on a cork which floats on water. The magnets are placed such that the axis of one produced bisects the axis of other at right angles. Then the cork has neither translational nor rotational motion. Reason: Net force on the cork is zero.
A)
If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion
doneclear
B)
If both Assertion and Reason are true but the Reason is not the correct explanation of the Assertion
question_answer60) Assertion: The speed of whirlwind in a tornado is alarmingly high. Reason: If no external torque acts on a body, its angular velocity remains conserved.
A)
If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion
doneclear
B)
If both Assertion and Reason are true but the Reason is not the correct explanation of the Assertion
question_answer62) The decreasing order of the stability of the ions \[C{{H}_{3}}-\underset{(I)}{\mathop{\overset{+}{\mathop{CH}}\,}}\,-C{{H}_{3}}\] \[C{{H}_{3}}-\underset{(II)}{\mathop{\overset{+}{\mathop{CH}}\,}}\,-OC{{H}_{3}}\] \[C{{H}_{3}}-\underset{(III)}{\mathop{\overset{+}{\mathop{CH}}\,}}\,-COC{{H}_{3}}\]
question_answer63) The IUPAC name of \[C{{H}_{3}}-\overset{C{{H}_{3}}}{\mathop{\overset{|}{\mathop{C}}\,}}\,-\overset{O}{\mathop{\overset{||}{\mathop{C}}\,}}\,-C{{H}_{2}}-C{{H}_{2}}OH\]
question_answer65) The half-life for the reaction \[{{N}_{2}}{{O}_{5}}\xrightarrow{{}}2N{{O}_{2}}+\frac{1}{2}{{O}_{2}}\] is \[2.4h\] at STP. Starting with 10.8 g of \[{{N}_{2}}{{O}_{5}}\] how much oxygen will be obtained after a period of \[9.6h\]?
question_answer68) If \[AgI\] crystallizes in zinc blende structure with \[{{I}^{-}}\] ions at lattice points. What fraction of tetrahedral voids is occupied by \[A{{g}^{+}}\] ions?
question_answer70) The solubility product of \[A{{s}_{2}}{{O}_{3}}\] is \[10.8\times {{10}^{-9}}.\] It is 50% dissociated in saturated solution. The solubility of salt is
question_answer71) The temperature dependence of rate constant (k) of a chemical reaction is written in terms of Arrhenius equation \[k=A{{e}^{-{{E}_{a}}/RT}}\]. Activation energy \[({{E}_{a}})\] of the reaction can be calculated by ploting
question_answer73) When \[{{H}_{2}}S\] gas is passed through the \[HCl\] containing aqueous solution of \[CuC{{l}_{2}},HgC{{l}_{2}},\]\[BiC{{l}_{3}}\]and \[CoC{{l}_{2}},\], it does not precipitate out
question_answer77) The hydrocarbon which does decolourise alkaline \[KMn{{O}_{4}}\] solution and also does not give any precipitate with ammoniacal silver nitrate is
question_answer79) One mole of methanol when burnt in \[{{O}_{2}}\], gives out \[723\text{ }kJ\text{ }mo{{l}^{-1}}\]heat. If one mole of \[{{O}_{2}}\] is used, what will be the amount of heat evolved?
question_answer80) The enthalpy of hydrogenation of cyclohexene is \[-119.5kJ\,mo{{l}^{-1}}.\]If resonance energy of benzene is \[-150.4\text{ }kJ\,mo{{l}^{-1}},\]its enthalpy of hydrogenation would be
question_answer81) A current of 96.5 A is passed for 18 min between nickel electrodes in 500 mL solution of \[2M\,\,Ni{{(N{{O}_{3}})}_{2}}.\]The molarity of solution after electrolysis would be
question_answer84) The standard emf of a galvanic cell involving cell reaction with n = 2 found to be 0.295 V at \[{{25}^{o}}C\]. The equilibrium constant of the reaction would be
question_answer88) The major product of the following reaction is \[C{{H}_{3}}-\overset{C{{H}_{3}}}{\mathop{\overset{|}{\mathop{\underset{OH}{\mathop{\underset{|}{\mathop{C}}\,}}\,}}\,}}\,-C{{H}_{2}}-OH\xrightarrow{{{H}_{2}}S{{O}_{4}}}\]
question_answer90) An aliphatic amine on treatment with alcoholic carbon disulphide and mercuric chloride forms ethyl isothiocyanate, the reaction is known as
question_answer97) A solution containing \[10g\] per \[d{{m}^{3}}\] of urea(molecular mass \[=60g\,mo{{l}^{-1}}\]) is isotonic with a 5% solution of a non volatile solute. The molecular mass of this non volatile solute is
question_answer101) Assertion: \[H-S-H\] bond angle in \[{{H}_{2}}S\] is closer to \[{{90}^{o}}\] but \[H-O-H\] bond angle in \[{{H}_{2}}O\] is \[{{104.5}^{o}}\]. Reason: \[lP-lP\] repulsion is stronger in \[{{H}_{2}}S\] than in \[{{H}_{2}}O\].
A)
If both Assertion and Reason are true and Reason is the correct explanation of Assertion.
doneclear
B)
If both Assertion and Reason are true but Reason is not the correct explanation of Assertion.
question_answer102) Assertion: Average life of a radioactive element is that period in which 63% of it is decayed. Reason: Average life \[\tau =1.44{{t}_{1/2}}\].
A)
If both Assertion and Reason are true and Reason is the correct explanation of Assertion.
doneclear
B)
If both Assertion and Reason are true but Reason is not the correct explanation of Assertion.
question_answer103) Assertion: At high pressure, the compression factor Z is \[\left( 1+\frac{Pb}{RT} \right)\]. Reason: At high pressure van der Waals equation is modified as \[P(V-b)=RT\].
A)
If both Assertion and Reason are true and Reason is the correct explanation of Assertion.
doneclear
B)
If both Assertion and Reason are true but Reason is not the correct explanation of Assertion.
question_answer104) Assertion: Viscocity of a liquid decreases on increasing the temperature. Reason: Evaporation of liquid increases with rise in temperature.
A)
If both Assertion and Reason are true and Reason is the correct explanation of Assertion.
doneclear
B)
If both Assertion and Reason are true but Reason is not the correct explanation of Assertion.
question_answer105) Assertion: On mixing \[500\text{ }mL\] of \[{{10}^{-6}}M\,C{{a}^{2+}}\] ion and \[500\text{ }mL\] of \[{{10}^{-6}}M\,{{F}^{-1}}\] ion, the precipitate of \[Ca{{F}_{2}}\] will be obtained. \[{{K}_{sp}}(Ca{{F}_{2}}={{10}^{-18}})\] Reason: If \[{{K}_{sp}}\] is greater than ionic product, a precipitate will develop.
A)
If both Assertion and Reason are true and Reason is the correct explanation of Assertion.
doneclear
B)
If both Assertion and Reason are true but Reason is not the correct explanation of Assertion.
question_answer106) Assertion: The conversion of fresh precipitate to colloidal state is called peptization. Reason: It is caused by addition of common ions.
A)
If both Assertion and Reason are true and Reason is the correct explanation of Assertion.
doneclear
B)
If both Assertion and Reason are true but Reason is not the correct explanation of Assertion.
question_answer107) Assertion: For the combustion of methane, \[\Delta E>\Delta H\] Reason: \[\Delta H\] is related by \[\Delta E\] by the expression. \[\Delta H=\Delta E+\Delta nRT\]
A)
If both Assertion and Reason are true and Reason is the correct explanation of Assertion.
doneclear
B)
If both Assertion and Reason are true but Reason is not the correct explanation of Assertion.
question_answer108) Assertion: According to Kohlrausch law the molar conductivity of a strong electrolyte at infinite dilution is sum of molar conductivities of its ions. Reason: The current carried by cation and anion is always equal.
A)
If both Assertion and Reason are true and Reason is the correct explanation of Assertion.
doneclear
B)
If both Assertion and Reason are true but Reason is not the correct explanation of Assertion.
question_answer109) Assertion: \[C-H\] bond in ethyne is shorter than \[C-H\] bonds in ethene. Reason: Carbon atom in ethene is sp hybridised while it is \[s{{p}^{2}}\] in ethyne.
A)
If both Assertion and Reason are true and Reason is the correct explanation of Assertion.
doneclear
B)
If both Assertion and Reason are true but Reason is not the correct explanation of Assertion.
question_answer113) Assertion: In the electrolysis of aqueous \[NaCl\], \[Na\] is preferentially discharged at mercury cathode forming sodium amalgam. Reason: It is due to the fact that hydrogen has a high over voltage at mercury cathode.
A)
If both Assertion and Reason are true and Reason is the correct explanation of Assertion.
doneclear
B)
If both Assertion and Reason are true but Reason is not the correct explanation of Assertion.
question_answer114) Assertion: \[C{{u}^{2+}}\] and \[C{{d}^{2+}}\] are separated by first adding \[KCN\] solution and then passing \[{{H}_{2}}S\] gas. Reason: \[KCN\] reduces \[C{{u}^{2+}}\] to \[C{{u}^{+}}\] and form a complex with it.
A)
If both Assertion and Reason are true and Reason is the correct explanation of Assertion.
doneclear
B)
If both Assertion and Reason are true but Reason is not the correct explanation of Assertion.
question_answer115) Assertion: Amines are more basic than esters and ethers. Reason: Nitrogen is less electronegative than oxygen. It is in better position to accommodate the positive charge on the proton.
A)
If both Assertion and Reason are true and Reason is the correct explanation of Assertion.
doneclear
B)
If both Assertion and Reason are true but Reason is not the correct explanation of Assertion.
question_answer116) Assertion: Alcohols have higher boiling points than ethers of comparable molecular masses. Reason: Alcohols and ethers are isomeric in nature.
A)
If both Assertion and Reason are true and Reason is the correct explanation of Assertion.
doneclear
B)
If both Assertion and Reason are true but Reason is not the correct explanation of Assertion.
question_answer117) Assertion: During test for nitrogen with Lassaigne extract on adding \[FeC{{l}_{3}}\] solution sometimes a red precipitate is obtained. Reason: Sulphur is also present.
A)
If both Assertion and Reason are true and Reason is the correct explanation of Assertion.
doneclear
B)
If both Assertion and Reason are true but Reason is not the correct explanation of Assertion.
question_answer118) Assertion: \[NaCl\] is precipitated when \[HCl\] gas is passed in a saturated solution of \[NaCl\]. Reason: \[HCl\] is strong acid.
A)
If both Assertion and Reason are true and Reason is the correct explanation of Assertion.
doneclear
B)
If both Assertion and Reason are true but Reason is not the correct explanation of Assertion.
question_answer120) Assertion: The hydrolysis of methyl acetate by dil. \[HCl\] is a pseudo first order reaction. Reason: \[HCl\] acts as a catalyst for the hydrolysis.
A)
If both Assertion and Reason are true and Reason is the correct explanation of Assertion.
doneclear
B)
If both Assertion and Reason are true but Reason is not the correct explanation of Assertion.
question_answer122) E. coli about to replicate was placed in a medium containing radioactive thynidine for five minutes. Then it was made to replicate in a normal medium. Which of the following observation will be correct?
question_answer124) In a given plant, red colour (R) of fruits is dominant over white fruit (r): and tallness (T) is dominant over dwarfness (t). If a plant with genotype RRTt is crossed with a plant of genotype rrtt, what will be the percentage of tall plants with red fruits in the next generation?
question_answer125) An action potential in the nerve fibre is produced when positive and negative charges on the outside and the inside of the axon membrane are reversed, because
A)
More potassium ions enter the axon as compared to sodium ions leaving it
doneclear
B)
more sodium ions enter the axon as compared to potassium ions leaving it
question_answer130) Downs syndrome is caused by an extra copy of chromosome number 21. What percentage of offspring produced by an affected mother and a normal father would be affected by this disorder?
question_answer131) Nicotiana sylvestris flowers only during long days and N. tobacum flowers only during short days. If raised in the laboratory under different photoperiods, they can be induced to flower at the same time and can be cross fertilized to produce self-fertile offspring. What is the best reason for considering N. sylvestris and N. tobacum to be separate species?
A species which makes up only a small proportion of the total biomass of a community, yet has a huge impact on the communitys organization and survival
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B)
A common species that has plenty of biomass, yet has a fairly low impact on the communitys organization
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C)
A rare species that has minimal impact on the biomass and on other species in the community
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D)
A dominant species that constitutes a large proportion of the biomass and which affect many other species
question_answer133) Age of fossils in the past was generally determined by radio-carbon method and other methods involving radioactive elements found in the rocks. More precise methods, which were used recently and led to the revision of the evolutionary period for different groups of organisms, includes
question_answer138) Farmers in a particular region were concerned that pre-mature yellowing of leaves of a pulse crop might cause decrease in the yield. Which treatment could be most beneficial to obtain maximum seed yield?
A)
Frequent irrigation of the crop
doneclear
B)
Treatment of the plants with cytokinins along with a small dose of nitrogenous fertilizer
doneclear
C)
Removal of all yellow leaves and spraying the remaining green leaves with 2, 4, 5-trichlorophenoxy acetic acid
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D)
Application of iron and magnesium to promote synthesis of chlorophyll
question_answer143) Arrange the following in the order of increasing volume (1) Tidal volume (2) Residual volume (3) Expiratory reserve volume (4) Vital capacity
question_answer144) On the basis of symptoms of chlorosis in leaves a student inferred that this was due to deficiency of nitrogen. The inference could be correct only if we assume that yellowing of leaves appeared first in
question_answer147) In the developmental history of mammalian heart, it is observed that it passes through a two-chambered fish-like heart, three chambered frog-like heart and finally four-chambered stage. To which hypothesis can this above cited statement by approximated?
question_answer148) A sewage treatment process in which a portion of the decomposer bacteria present in the waste is recycled into the beginning of the process, is called
question_answer149) Cellulose, the most important constituent of plant cell wall is made up of
A)
branched chain of glucose molecules linked by \[\alpha \], 1, 6 glycosidic bond at the site of branching
doneclear
B)
unbranched chain of glucose molecules linked by \[\alpha \], 1, 4, glycosidic bond
doneclear
C)
branched chain of glucose molecules linked by \[\beta \], 1, 4 glycosidic bond in straight chain and \[\alpha \],1, 6 glycosidic bond at the site of branching
doneclear
D)
unbranched chain of glucose molecules linked by (\[\beta \], 1, 4 glycosidic bond
question_answer158) Grain colour in wheat is determined by three pairs of polygene. Following the cross AABBCC (dark colour) x aabbcc (light colour), in \[{{F}_{2}}\] generation what proportion of the progeny is likely to resemble either parent?
question_answer161) Assertion: Euglena is a plant due it presence of chlorophyll. Reason: Euglena cannot be classified a the basis of two kingdom system
A)
If both Assertion and Reason are true and Reason is the correct explanation of the Assertion.
doneclear
B)
If both Assertion and Reason are true but the Reason is not the correct explanations of Assertion.
question_answer162) Assertion: In fungi sexual apparatus decrease in complexity from lower to higher froms Reason: In algae sexual apparatus increases in complexity from simple to the higher forms
A)
If both Assertion and Reason are true and Reason is the correct explanation of the Assertion.
doneclear
B)
If both Assertion and Reason are true but the Reason is not the correct explanations of Assertion.
question_answer163) Assertion: The true nucleus is generaly absent in E. coli and other prokaryotes Reason: An undifferentiated, unorganized fibrillar nucleus without any limiting membrane is observed in prokaryotic cells
A)
If both Assertion and Reason are true and Reason is the correct explanation of the Assertion.
doneclear
B)
If both Assertion and Reason are true but the Reason is not the correct explanations of Assertion.
question_answer164) Assertion: The imbalance in concentration of \[N{{a}^{+}},\,{{K}^{+}}\] and proteins generates resting potential Reason: To maintain the unequal distribution of \[N{{a}^{+}}\] and \[{{K}^{+}}\], the neurons use electrical energy.
A)
If both Assertion and Reason are true and Reason is the correct explanation of the Assertion.
doneclear
B)
If both Assertion and Reason are true but the Reason is not the correct explanations of Assertion.
question_answer165) Assertion: Arachidic acid is an unsaniratei fatty acid. Reason: There are present one or more double bonds between carbon atoms E unsaturated fatty acids.
A)
If both Assertion and Reason are true and Reason is the correct explanation of the Assertion.
doneclear
B)
If both Assertion and Reason are true but the Reason is not the correct explanations of Assertion.
question_answer166) Assertion: A coenzymes or metal ions that is very tightly bound to enzyme protein is called prosthetic group. Reason: A complete, catalytically active enzyme together with its bound prosthetic group is called apoenzyme.
A)
If both Assertion and Reason are true and Reason is the correct explanation of the Assertion.
doneclear
B)
If both Assertion and Reason are true but the Reason is not the correct explanations of Assertion.
question_answer167) Assertion: Amber codon is a terminal codon. Reason: If in a mRNA, a termination coda is present, the protein synthesis stops abruptly whether the protein synthesis is complete or not.
A)
If both Assertion and Reason are true and Reason is the correct explanation of the Assertion.
doneclear
B)
If both Assertion and Reason are true but the Reason is not the correct explanations of Assertion.
question_answer168) Assertion: In cymose tap root system oldest branch lies very near the growing point of the root while the youngest branch is farthest away from it. Reason: In cymose tap root system, tie primary root itself stops growing after some time; but secondary roots carry on further growth of the root system.
A)
If both Assertion and Reason are true and Reason is the correct explanation of the Assertion.
doneclear
B)
If both Assertion and Reason are true but the Reason is not the correct explanations of Assertion.
question_answer169) Assertion: 7-celled, 8 nucleate and monosporic embryosac is called Polygonum type of embryo sac. Reason: It was discovered by Hofmeister for the first time in Polygonum.
A)
If both Assertion and Reason are true and Reason is the correct explanation of the Assertion.
doneclear
B)
If both Assertion and Reason are true but the Reason is not the correct explanations of Assertion.
question_answer170) Assertion: The quiescent centre acts as a reservoir of relatively resistant cells which constitute a permanent source of active initials Reason: The cells of the inactive region of quiescent centre become active when the previous active initials get damaged.
A)
If both Assertion and Reason are true and Reason is the correct explanation of the Assertion.
doneclear
B)
If both Assertion and Reason are true but the Reason is not the correct explanations of Assertion.
question_answer171) Assertion: Phase of cell division is also known as formative phase Reason: In formative phase new cells are produced from pre-existing cells through meiosis division.
A)
If both Assertion and Reason are true and Reason is the correct explanation of the Assertion.
doneclear
B)
If both Assertion and Reason are true but the Reason is not the correct explanations of Assertion.
question_answer173) Assertion: When dried seeds of pea are placed in a tin and water added up to their upper level and then a lid is putted lightly over it. Within an hour, the lid will be blown off. Reason: Due to rapid cell division in pea seeds.
A)
If both Assertion and Reason are true and Reason is the correct explanation of the Assertion.
doneclear
B)
If both Assertion and Reason are true but the Reason is not the correct explanations of Assertion.
question_answer174) Assertion: Cyclic pathway of photosynthesis first appeared in some eubacterial species. Reason: Oxygen started accumulating in the atmosphere after the non-cyclic pathway of photosynthesis evolved.
A)
If both Assertion and Reason are true and Reason is the correct explanation of the Assertion.
doneclear
B)
If both Assertion and Reason are true but the Reason is not the correct explanations of Assertion.
question_answer175) Assertion: Organochlorine pesticides are organic compounds that have been chlorinated. Reason: Fenitrothion is one of the organochlorine pesticides.
A)
If both Assertion and Reason are true and Reason is the correct explanation of the Assertion.
doneclear
B)
If both Assertion and Reason are true but the Reason is not the correct explanations of Assertion.
question_answer176) Assertion: Tropical rain forests are disappearing fast from developing countries such as India. Reason: No value is attached to these forests because these are poor in biodiversity.
A)
If both Assertion and Reason are true and Reason is the correct explanation of the Assertion.
doneclear
B)
If both Assertion and Reason are true but the Reason is not the correct explanations of Assertion.
question_answer177) Assertion: Gene flow increase genetic variations. Reason: The random introduction of new alleles into recipient population and their removal from the donor population affects allele frequency.
A)
If both Assertion and Reason are true and Reason is the correct explanation of the Assertion.
doneclear
B)
If both Assertion and Reason are true but the Reason is not the correct explanations of Assertion.
question_answer178) Assertion: Mast cells in the human body release excessive amount of inflammatory chemicals which cause allergic reactions. Reason: Allergens in the environment on reacting human body stimulate mast cells in certain individuals.
A)
If both Assertion and Reason are true and Reason is the correct explanation of the Assertion.
doneclear
B)
If both Assertion and Reason are true but the Reason is not the correct explanations of Assertion.
question_answer179) Assertion: Thick layers of muscles are present in the wall of alimentary canal. Reason: These muscles help in the mixing of food materials with the enzymes coming from different glands in the alimentary canal.
A)
If both Assertion and Reason are true and Reason is the correct explanation of the Assertion.
doneclear
B)
If both Assertion and Reason are true but the Reason is not the correct explanations of Assertion.
question_answer180) Assertion: Phenylketonuria is a recessive hereditary disease caused by bodys failure to oxidize an amino acid phenylalanine to tyrosine, because of defective enzyme. Reason: It results the presence of phenylalanine acid in urine.
A)
If both Assertion and Reason are true and Reason is the correct explanation of the Assertion.
doneclear
B)
If both Assertion and Reason are true but the Reason is not the correct explanations of Assertion.