# Solved papers for NEET NEET SOLVED PAPER 2015 (C)

### done NEET SOLVED PAPER 2015 (C)

• question_answer1) If energy (E), velocity [v] and time (T) are chosen as the fundamental quantities, the dimensional formula of surface tension will be

A) $[E{{v}^{-2}}{{T}^{-1}}]$

B) $[E{{v}^{-1}}{{T}^{-2}}]$

C) $[E{{v}^{-2}}{{T}^{-2}}]$

D) $[{{E}^{-2}}{{v}^{-1}}{{T}^{-3}}]$

• question_answer2) A ship A is moving Westwards with a speed of $10\,km\,{{h}^{-1}}$ and a ship B 100 km South of A, is moving Northwards with a speed of $10\,km\,{{h}^{-1}}$. The time after which the distance between them becomes shortest is

A) 0 h

B) 5 h

C) $5\sqrt{2}h$

D) $10\sqrt{2}h$

• question_answer3) A particle of unit mass undergoes one-dimensional motion such that its velocity varies according to $v(x)=\beta {{x}^{-2n}}$ where, $\beta$ and n are constants and $x$ is the position of the particle. The acceleration of the particle as a function of x, is given by

A) $-2n{{\beta }^{2}}\,{{x}^{-2n-1}}$

B) $-2n{{\beta }^{2}}\,{{x}^{-4n-1}}$

C) $-2{{\beta }^{2}}\,\,{{x}^{-2n+1}}$

D) $-2n{{\beta }^{2}}\,\,\,{{e}^{-4n+1}}$

• question_answer4) Three blocks A, B and C of masses 4 kg, 2 kg and 1 kg respectively, are in contact on a 1 frictionless surface, as shown. If a force of 14 N is applied on the 4 kg block, then the contact force between A and B is A) 2N

B) 6N

C) 8 N

D) 18 N

• question_answer5) A block A of mass ${{m}_{1}}$ rests on a horizontal table. A light string connected to it passes over a frictionless pulley at the edge of table and from its other end another block B of mass ${{m}_{2}}$ is suspended. The coefficient of kinetic friction between the block and the table is${{\mu }_{k}}$. When the block A is sliding on the table, the tension in the string is

A) $\frac{({{m}_{2}}+{{\mu }_{k}}{{m}_{1}})g}{({{m}_{1}}+{{m}_{2}})}$

B) $\frac{({{m}_{2}}+{{\mu }_{k}}{{m}_{1}})g}{({{m}_{1}}+{{m}_{2}})}$

C) $\frac{{{m}_{1}},{{m}_{2}}(1+{{\mu }_{k}})g}{({{m}_{1}}+{{m}_{2}})}$

D) $\frac{{{m}_{1}}{{m}_{2}}(1-{{\mu }_{k}})g}{({{m}_{1}}+{{m}_{2}})}$

• question_answer6) Two similar springs P and Q have spring constants ${{K}_{P}}$ and ${{K}_{Q}}$, such that ${{K}_{P}}>{{K}_{Q}}$. They are stretched, first by the same amount (case a), then by the same force (case b). The work done by the springs ${{W}_{P}}$ and ${{W}_{Q}}$ are related as, in case (a) and case (b), respectively

A) ${{W}_{P}}={{W}_{Q}};{{W}_{P}}>{{W}_{Q}}$

B) ${{W}_{P}}={{W}_{Q}};{{W}_{P}}={{W}_{Q}}$

C) ${{W}_{P}}>{{W}_{Q}};{{W}_{Q}}>{{W}_{P}}$

D) ${{W}_{P}}<{{W}_{Q}};{{W}_{Q}}<{{W}_{P}}$

• question_answer7) A block of mass 10 kg, moving in x-direction with a constant speed of $10\,m{{s}^{-1}},$ is subjected to a retarding force $F=0.1\,\times \,J/m$ during its travel from $x=20\,m$ m to 30 m. Its final KE will be

A) 475 J

B) 450 J

C) 275 J

D) 250 J

• question_answer8) A particle of mass m is driven by a machine that delivers a constant power k watts. If the particle starts from rest, the force on the particle at time t is

A) $\sqrt{\frac{mk}{2}}\,{{t}^{{}^{1}/{}_{2}}}$

B) $\sqrt{mk}\,{{t}^{{}^{-1}/{}_{2}}}$

C) $\sqrt{2mk}\,{{t}^{{}^{-1}/{}_{2}}}$

D) $\frac{1}{2}\sqrt{mk}\,{{t}^{{}^{-1}/{}_{2}}}$

• question_answer9) Two particles of masses ${{m}_{1}},{{m}_{2}}$ move with initial velocities ${{u}_{1}}$ and ${{u}_{2}}$. On collision, one of the particles get excited to higher level, after absorbing energy $\varepsilon$. If final velocities of particles be ${{v}_{1}}$ and ${{v}_{2}},$ then we must have

A) $m_{1}^{2}{{u}_{1}}+m_{2}^{2}{{u}_{2}}-\varepsilon =m_{1}^{2}{{v}_{1}}+m_{2}^{2}{{v}_{2}}$

B) $\frac{1}{2}{{m}_{1}}u_{1}^{2}+\frac{1}{2}{{m}_{2}}u_{2}^{2}=\frac{1}{2}{{m}_{1}}v_{1}^{2}+\frac{1}{2}{{m}_{2}}v_{2}^{2}-\varepsilon$

C) $\frac{1}{2}{{m}_{1}}u_{1}^{2}+\frac{1}{2}{{m}_{2}}u_{2}^{2}-\varepsilon =\frac{1}{2}{{m}_{1}}v_{1}^{2}+\frac{1}{2}{{m}_{2}}v_{2}^{2}$

D) $\frac{1}{2}m_{1}^{2}u_{1}^{2}+\frac{1}{2}m_{2}^{2}u_{2}^{2}+\varepsilon =\frac{1}{2}m_{1}^{2}v_{1}^{2}+\frac{1}{2}m_{2}^{2}v_{2}^{2}$

• question_answer10) A rod of weight w is supported by two parallel knife edges A and B and is in equilibrium in a horizontal position. The knives are at a distance d from each other. The centre of mass of the rod is at distance x from A. The normal reaction on A is

A) $\frac{wx}{d}$

B) $\frac{wd}{x}$

C) $\frac{w(d-x)}{x}$

D) $\frac{w(d-x)}{d}$

• question_answer11) A mass m moves in a circle on a smooth horizontal plane with velocity ${{v}_{0}}$ at a radius ${{R}_{0}}$. The mass is attached to a string which passes through a smooth hole in the plane as shown. The tension in the string is increased gradually and finally m moves in a circle of radius$\frac{{{R}_{0}}}{2}$. The final value of the kinetic energy is

A) $mv_{0}^{2}$

B) $\frac{1}{4}mv_{0}^{2}$

C) $2\,mv_{0}^{2}$

D) $\frac{1}{2}mv_{0}^{2}$

• question_answer12) Three identical spherical shells, each of mass m and radius r are placed as shown in figure. Consider an axis XX', which is touching to two shells and passing through diameter of third shell. Moment of inertia of the system consisting of these three spherical shells about XX' axis is A) $\frac{11}{5}m{{r}^{2}}$

B) $3\,m{{r}^{2}}$

C) $\frac{16}{5}m{{r}^{2}}$

D) $4\,m{{r}^{2}}$

• question_answer13) Kepler's third law states that square of period of revolution (T) of a planet around the sun, is proportional to third power of average distance r between the sun and planet i.e. ${{T}^{2}}=K{{r}^{3}},$ here K is constant. If the masses of the sun and planet are M and m respectively, then as per Newton's law of gravitation force of attraction between them is $F=\frac{GMm}{{{r}^{2}}}$, here G is gravitational constant. The relation between G and K is described as

A) $GK=4{{\pi }^{2}}$

B) $GMK=4{{\pi }^{2}}$

C) $K=G$

D) $K=\frac{l}{G}$

• question_answer14) Two spherical bodies of masses M and 5M and radii R and 2R are released in free space with initial separation between their centres equal to 12 R. If they attract each other due to gravitational force only, then the distance covered by the smaller body before collision is

A) $2.5R$

B) $4.5R$

C) $7.5R$

D) $1.5R$

• question_answer15) On observing light from three different stars P, Q and R, it was found that intensity of violet colour is maximum in the spectrum of P, the intensity of green colour is maximum in the spectrum of R and the intensity of red colour is maximum in the spectrum of Q. If ${{T}_{P}},{{T}_{Q}}$ and ${{T}_{R}}$ are the respective absolute temperatures of P, Q and R, then it can be concluded from the above observations that

A) ${{T}_{P}}>{{T}_{Q}}>{{T}_{R}}$

B) ${{T}_{P}}>{{T}_{R}}>{{T}_{Q}}$

C) ${{T}_{P}}<{{T}_{R}}<{{T}_{Q}}$

D) ${{T}_{P}}<{{T}_{Q}}<{{T}_{R}}$

• question_answer16) The approximate depth of an ocean is 2 700 m. The compressibility of water is $45.4\times {{10}^{-11}}P{{a}^{-1}}$ and density of water is${{10}^{3}}kg/{{m}^{3}}$. What fractional compression of water will be obtained at the bottom of the ocean?

A) $0.8\times {{10}^{-2}}$

B) $1.0\times {{10}^{-2}}$

C) $1.2\times {{10}^{-2}}$

D) $1.4\times {{10}^{-2}}$

• question_answer17) The two ends of a metal rod are maintained at temperatures ${{100}^{\text{o}}}C$ and ${{110}^{\text{o}}}C$. The rate of heat flow in the rod is found to be 4.0 J/s. If the ends are maintained at temperatures ${{200}^{\text{o}}}C$ and ${{210}^{\text{o}}}C,$ the rate of heat flow will be

A) 44.0 J/s

B) 16.8 J/s

C) 8.0 J/s

D) 4.0 J/s

• question_answer18) A wind with speed 40 m/s blows parallel to the roof of a house. The area of the roof is . Assuming that the pressure inside the house is atmospheric pressure, the force exerted by the wind on the roof and the direction of the force will be $({{p}_{air}}=1.2kg/{{m}^{3}})$

A) $4.8\times {{10}^{5}}N$ N, downwards

B) $4.8\times {{10}^{5}}N$, upwards

C) $2.4\times {{10}^{5}}N$, upwards

D) $2.4\times {{10}^{5}}N$, downwards

• question_answer19) Figure below shows two paths that may be taken by a gas to go from a state A to a state C. In process AB, 400 J of heat is added to the system and in process BC, 100 J of heat is added to the system. The heat absorbed by the system in the process AC will be

A) 380 J

B) 500 J

C) 460 J

D) 300 J

• question_answer20) A Carnot engine, having an efficiency of $\eta =\frac{1}{10}$as heat engine, is used as a refrigerator. If the work done on the system is 10 J, the amount of energy absorbed from the reservoir at lower temperature is

A) $100\,\text{J}$

B) $99\text{J}$

C) $90\text{J}$

D) $1\text{J}$

• question_answer21) One mole of an ideal diatomic gas undergoes a transition from A to B along a path AB as shown in the figure The change in internal energy of the gas during the transition is

A) 20 kJ

B) -20 kJ

C) 20 J

D) -12 kJ

• question_answer22) The ratio of the specific heats $\frac{{{C}_{p}}}{{{C}_{v}}}=\gamma$ in terms of degrees of freedom (n) is given by

A) $\left( 1+\frac{1}{n} \right)$

B) $\left( 1+\frac{n}{3} \right)$

C) $\left( 1+\frac{2}{n} \right)$

D) $\left( 1+\frac{2}{n} \right)$

• question_answer23) When two displacements represented by ${{y}_{1}}=a\sin (\omega t)$ and ${{y}_{2}}=b\cos \,(\omega t)$ are superimposed, the motion is

A) not a simple harmonic

B) simple harmonic with amplitude $\frac{a}{b}$

C) simple harmonic with amplitude $\sqrt{{{a}^{2}}+{{b}^{2}}}$

D) simple harmonic with amplitude $\frac{(a+b)}{2}$

• question_answer24) A particle is executing SHM along a straight line. Its velocities at distances ${{x}_{1}}$ and ${{x}_{2}}$ from the mean position are ${{v}_{1}}$ and ${{v}_{2}}$, respectively. Its time period is

A) $2\pi \sqrt{\frac{x_{1}^{2}+x_{2}^{2}}{v_{1}^{2}+v_{2}^{2}}}$

B) $2\pi \sqrt{\frac{x_{2}^{2}-x_{1}^{2}}{v_{1}^{2}-v_{2}^{2}}}$

C) $2\pi \sqrt{\frac{v_{1}^{2}+v_{2}^{2}}{x_{1}^{2}+x_{2}^{2}}}$

D) $2\pi \sqrt{\frac{v_{1}^{2}-v_{2}^{2}}{x_{1}^{2}-x_{2}^{2}}}$

• question_answer25) The fundamental frequency of a closed organ pipe of length 20 cm is equal to the second overtone of an organ pipe open at both the ends. The length of organ pipe open at both the ends is

A) 80 cm

B) 100 cm

C) 120 cm

D) 140 cm

• question_answer26) A parallel plate air capacitor of capacitance C is connected to a cell of emf V and then disconnected from it. A dielectric slab of dielectric constant K, which can just fill the air gap of the capacitor is now inserted in it. Which of the following is incorrect?

A) The potential difference between the plates decreases K times

B) The energy stored in the capacitor decreases K times

C) The change in energy stored is $\frac{1}{2}C{{V}^{2}}\left( \frac{1}{K}-1 \right)$

D) The charge on the capacitor is not conserved

• question_answer27) The electric field in a certain region is acting radially outward and is given by E = Ar. A. charge contained in a sphere of radius 'a' centred at the origin of the field' will be given by

A) $4\pi {{\varepsilon }_{0}}A{{a}^{2}}$

B) $A{{\varepsilon }_{0}}{{a}^{2}}$

C) $4\pi {{\varepsilon }_{0}}A{{a}^{3}}$

D) ${{\varepsilon }_{0}}A{{a}^{3}}$

• question_answer28) A potentiometer wire has length 4 m and resistance $8\,\Omega$. The resistance that must be connected in series with the wire and an accumulator of emf 2V, so as to get a potential gradient 1 mV per cm on the wire is

A) 32 $\Omega$

B) 40 $\Omega$

C) 44 $\Omega$

D) 48$\Omega$

• question_answer29) A, B and C are voltmeters of resistance R, 1.5R and 3R respectively as shown in the figure. When some potential difference is applied between X and Y, the voltmeter readings are ${{V}_{A}},{{V}_{B}}$ and ${{V}_{C}}$ respectively. Then, A) ${{V}_{A}}={{V}_{B}}={{V}_{C}}$

B) ${{V}_{A}}\ne {{V}_{B}}={{V}_{C}}$

C) ${{V}_{A}}={{V}_{B}}\ne {{V}_{C}}$

D) ${{V}_{A}}\ne {{V}_{B}}\ne {{V}_{C}}$

• question_answer30) Across a metallic conductor of non-uniform cross-section, a constant potential difference is applied. The quantity which remain constant along the conductor is

A) current density

B) current

C) drift velocity

D) electric field

• question_answer31) A wire carrying current $I$ has the shape as shown in adjoining figure. Linear parts of the wire are very long and parallel to X-axis while semicircular portion of radius B. is lying in Y-Z plane. Magnetic field at point O is A) $\mathbf{B}=\frac{{{\mu }_{0}}}{4\pi }\frac{l}{R}(\pi \hat{i}+2\hat{k})$

B) $\mathbf{B}=-\frac{{{\mu }_{0}}}{4\pi }\frac{l}{R}(\pi \hat{i}-2\hat{k})$

C) $\mathbf{B}=-\frac{{{\mu }_{0}}}{4\pi }\frac{l}{R}(\pi \hat{i}+2\hat{k})$

D) $\mathbf{B}=\frac{{{\mu }_{0}}}{4\pi }\frac{l}{R}(\pi \hat{i}-2\hat{k})$

• question_answer32) An electron moving in a circular orbit of radius r makes n rotations per second. The magnetic field produced at the centre has magnitude

A) $\frac{{{\mu }_{0}}ne}{2\pi r}$

B) zero

C) $\frac{{{\mu }_{0}}{{n}^{2}}e}{r}$

D) $\frac{{{\mu }_{0}}ne}{2r}$

• question_answer33) A conducting square frame of side a and a long straight wire carrying current $I$ are located in the same plane as shown in the figure. The frame moves to the right with a constant velocity V. The emf induced in the frame will be proportional to A) $\frac{1}{{{x}^{2}}}$

B) $\frac{1}{{{(2x-a)}^{2}}}$

C) $\frac{1}{{{(2x+a)}^{2}}}$

D) $\frac{1}{(2x+a)(2x+a)}$

• question_answer34) A resistance R draws power P when connected to an AC source. If an inductance such that the impedance of the circuit becomes Z the power drawn will the

A) $P{{\left( \frac{R}{Z} \right)}^{2}}$

B) $P\sqrt{\frac{R}{Z}}$

C) $P\left( \frac{R}{Z} \right)$

D) P

• question_answer35) A radiation of energy E falls normally on a perfectly reflecting surface. The momentum on a transferred to the surface is (c = velocity of light)

A) $\frac{E}{c}$

B) $\frac{2E}{c}$

C) $\frac{2E}{{{c}^{2}}}$

D) $\frac{E}{{{c}^{2}}}$

• question_answer36) Two identical thin plano-convex glass lenses (refractive index 1.5) each having radius of curvature of 20 cm are placed wait their convex surfaces in contact at the centre. The intervening space is filled with oil of refractive index 1.7 The focal length of the combination is

A) $-20\,cm$

B) $-25\,cm$

C) $-50cm$

D) $50cm$

• question_answer37) For a parallel beam of monochromatic light of wavelength '$\lambda$' diffraction is produced by a single slit whose width 'a' is of the order of the wavelength of the light. If D is the distance of the screen from the slit, the width a the of the central maxima will be

A) $\frac{2\lambda D}{a}$

B) $\frac{D\lambda }{a}$

C) $\frac{Da}{\lambda }$

D) $\frac{2Da}{\lambda }$

• question_answer38) In a double slit experiment, the two slits are 1 mm apart and the screen is placed 1 m away. A monochromatic light of wavelength 500 nm is used. What will be the width of each slit for obtaining ten maxima of double slit within the central maxima of single slit pattern.

A) 0.2 mm

B) 0.1 mm

C) 0.5 mm

D) 0.02 mm

• question_answer39) The refracting angle of a prism is A, and refractive index of the material of the prism is cot (A/2). The angle of minimum deviation is

A) ${{180}^{{}^\circ }}-3A$

B) ${{180}^{{}^\circ }}-2A$

C) ${{90}^{{}^\circ }}-A$

D) ${{180}^{{}^\circ }}+2A$

• question_answer40) A certain metallic surface is illuminated with monochromatic light of wavelength $\lambda$. The stopping potential for photoelectric current for this light is $3{{V}_{0}}$. If the same surface is illuminated with light of wavelength 2$\lambda$, the stopping potential is ${{V}_{0}}$. The threshold wavelength for this surface for photoelectric effect is

A) $6\lambda$

B) $4\lambda$

C) $\frac{\lambda }{4}$

D) $\frac{\lambda }{6}$

• question_answer41) Which of the following figures represent the variation of particle momentum and the associated de-Broglie wavelength?

A) B) C) D) • question_answer42) Consider ${{3}^{rd}}$ orbit of $H{{e}^{+}}$ (Helium), using non-relativistic approach, the speed of electron in this orbit will be (given $K=9\times {{10}^{9}}$ constant, Z = 2 and h (Planck's constant) = $6.6\times {{10}^{-34}}\text{J}-s$)

A) $2.92\times {{10}^{6}}m/s$

B) $1.46\times {{10}^{6}}m/s$

C) $0.73\times {{10}^{6}}m/s$

D) $3.0\times {{10}^{8}}m/s$

• question_answer43) If radius of the $_{13}^{27}\text{Al}$ nucleus is taken to be ${{R}_{\text{Al}}},$ then the radius of $_{53}^{125}Te$ nucleus is nearly

A) ${{\left( \frac{53}{13} \right)}^{\frac{1}{3}}}{{R}_{\text{Al}}}$

B) $\frac{5}{3}{{\text{R}}_{\text{Al}}}$

C) $\frac{3}{5}{{\text{R}}_{\text{Al}}}$

D) ${{\left( \frac{13}{53} \right)}^{\frac{1}{3}}}{{\text{R}}_{\text{Al}}}$

• question_answer44) If in a p-n junction, a square input signal of 10 V is applied as shown, then the output across ${{R}_{L}}$ will be

A) B) C) D) • question_answer45) Which logic gate is represented by the following combination of logic gates? A) OR

B) NAND

C) AND

D) NOR

• question_answer46) Which of the following species contains equal number of $\sigma$ and $\pi$-bonds?

A) $HCO_{3}^{-}$

B) $Xe{{O}_{4}}$

C) ${{(CN)}_{2}}$

D) $C{{H}_{2}}{{(CN)}_{2}}$

• question_answer47) The species $Ar,{{K}^{+}}$ and $C{{a}^{2+}}$ contain the same number of electrons. In which order do their radii increase?

A) $Ar+{{K}^{+}}<C{{a}^{2+}}$

B) $C{{a}^{2+}}<Ar<{{K}^{+}}$

C) $C{{a}^{2+}}<{{K}^{+}}<Ar$

D) ${{K}^{+}}<Ar<C{{a}^{2+}}$

• question_answer48) The function of Sodium pump is a biological process operating in each and every cell of all animals. Which of the following biologically important ions is also a constituent of this pump?

A) $C{{a}^{2+}}$

B) $M{{g}^{2+}}$

C) ${{K}^{+}}$

D) $F{{e}^{2+}}$

• question_answer49) Metals are usually not found as nitrates in their ores. Out of the following two (a and b) reasons which is/are true for the above observation?

 I. Metal nitrates are highly unstable. II. Metal nitrates are highly soluble in water.

A) I and II are true

B) I and II are false

C) I is false but II is true

D) I is true but II is false

• question_answer50) Solubility of the alkaline earth's metal sulphates in water decreases in the sequence

A) $Mg>Ca>Sr>Ba$

B) $Ca>Sr>Ba>Mg$

C) $Sr>Ca>Mg>Ba$

D) $Ba>Mg>Sr>Ca$

• question_answer51) Because of lanthanoid contraction, which of the following pairs of elements have nearly same atomic radii? (Numbers in the parenthesis are atomic numbers).

A) $Ti(22)and\,Zr(40)$

B) $Zr(40)and\,Nb(41)$

C) $Zr(40)and\,Hf\,(72)$

D) $Zr(40)and\,Ta(73)$

• question_answer52) Which of the following processes does not involve oxidation of iron?

A) Rusting of iron sheets

B) Decolourisation of blue $CuS{{O}_{4}}$ solution by iron

C) Formation of $Fe{{(CO)}_{5}}$ from Fe

D) Liberation of Hg from steam by iron a high temperature

• question_answer53) Which of the following pairs of ions are isoelectronic and isostructural?

A) $CO_{3}^{2-},SO_{3}^{2-}$

B) $ClO_{3}^{-},\,CO_{3}^{2-}$

C) $SO_{3}^{2-},NO_{3}^{-}$

D) $ClO_{3}^{-},SO_{3}^{2-}$

• question_answer54) Which of the following options represents the correct bond order?

A) $O_{2}^{-}>{{O}_{2}}>O_{2}^{+}$

B) $O_{2}^{-}<{{O}_{2}}<O_{2}^{+}$

C) $O_{2}^{-}>{{O}_{2}}<O_{2}^{+}$

D) $O_{2}^{-}<{{O}_{2}}>O_{2}^{+}$

• question_answer55) Nitrogen dioxide and sulphur dioxide have some properties in common. Which property is shown by one of these compounds, but not by the other?

A) Forms' acid-rain

B) Is a reducing agent

C) Is soluble in water

D) Is used as a food-preservative

• question_answer56) Maximum bond angle at nitrogen is present in which of the following?

A) $N{{O}_{2}}$

B) $NO_{2}^{-}$

C) $NO_{2}^{+}$

D) $NO_{3}^{-}$

• question_answer57) Magnetic moment 2.84 BM is given by (At. no. $Ni=28,\,Ti=22,\,Cr=24,\,Co=27$)

A) $N{{i}^{2+}}$

B) $T{{i}^{3+}}$

C) $C{{r}^{3+}}$

D) $C{{O}^{2+}}$

• question_answer58) Cobalt (III) chloride forms several octahedral complexes with ammonia. Which of the following will not give test for chloride ions with silver nitrate at ${{25}^{\text{o}}}C$?

A) $CoC{{l}_{3}}.3N{{H}_{3}}$

B) $CoC{{l}_{3}}.\,4N{{H}_{3}}$

C) $CoC{{l}_{3}}.5N{{H}_{3}}$

D) $CoC{{l}_{3}}.6N{{H}_{3}}$

• question_answer59) Which of these statements about ${{[Co{{(CN)}_{6}}]}^{3-}}$ is true?

A) ${{[Co{{(CN)}_{6}}]}^{3-}}$has no unpaired electrons and will be in a low-spin configuration.

B) ${{[Co{{(CN)}_{6}}]}^{3-}}$ has four unpaired electrons and will be in a low-spin configuration.

C) ${{[Co{{(CN)}_{6}}]}^{3-}}$ has four unpaired electrons and will be in a high-spin configuration.

D) ${{[Co{{(CN)}_{6}}]}^{3-}}$ has no unpaired electrons and will be in a high-spin configuration.

• question_answer60) The activation energy of a reaction can be determined from the slope of which of the following graphs?

A) In $K\,vsT$

B) $\frac{\text{ln}K}{T}vsT$

C) In $Kvs\frac{l}{t}$

D) $\frac{T}{\ln \,k}vs\frac{l}{T}$

• question_answer61) Which one is not equal to zero for an ideal solution?

A) $\Delta {{H}_{mix}}$

B) $\Delta {{S}_{mix}}$

C) $\Delta {{V}_{mix}}$

D) $\Delta P={{P}_{observed}}-\,{{P}_{Raoult}}$

• question_answer62) A mixture of gases contains ${{H}_{2}}$ and ${{O}_{2}}$ gases in the ratio of 1 : 4 (w/w). What is the molar ratio of the two gases in the mixture?

A) 1 : 4

B) 4 : 1

C) 16 : 1

D) 2 : 1

• question_answer63) A given metal crystallizes out with a cubic structure having edge length of 361 pm. If there are four metal atoms in one unit cell, what is the radius of one atom?

A) 40 pm

B) 127 pm

C) 80 pm

D) 108 pm

• question_answer64) When initial concentration of a reactant is doubled in a reaction, its half-life period is not affected. The order of the reaction is

A) zero

B) first

C) second

D) more than zero but less than first

• question_answer65) If the value of an equilibrium constant for a particular reaction is $1.6\times {{10}^{12}}$, then at equilibrium the system will contain

A) all reactants

B) mostly reactants

C) mostly products

D) similar amounts of reactants and products

• question_answer66) A device that converts energy of combustion of fuels like hydrogen and methane, directly into electrical energy is known as

A) fuel cell

B) electrolytic cell

C) dynamo

D) Ni-Cd cell

• question_answer67) The boiling point of $0.2\,\,mol\,\,k{{g}^{-1}}$ solution of X in water is greater than equimolal solution of Y in water. Which one of the following statements is true in this case?

A) X is undergoing dissociation in water.

B) Molecular mass of X is greater than the molecular mass of V.

C) Molecular mass of X is less than the molecular mass of V.

D) V is undergoing dissociation in water while X undergoes no change,

• question_answer68) Which one of the following electrolytes has the same value of van't Hoffs factor (2) as that of $A{{l}_{2}}{{\left( S{{O}_{4}} \right)}_{3}}$ (if all are 100% ionized)?

A) ${{K}_{2}}S{{O}_{4}}$

B) ${{K}_{3}}[Fe{{(CN)}_{6}}]$

C) $Al{{(N{{O}_{3}})}_{3}}$

D) ${{K}_{4}}[Fe{{(CN)}_{6}}]$

• question_answer69) The number of d-electrons in $F{{e}^{2+}}\,(Z=26)$ is not equal to the number of electrons in which one of the following?

A) s-electrons in $Mg(Z=12)$

B) p-electrons in $Cl(Z=17)$

C) d-electrons in $Fe(Z=26)$

D) p-electrons in $Ne(Z=10)$

• question_answer70) The correct bond order in the following species is

A) $O_{2}^{2+}>O_{2}^{+}>O_{2}^{-}$

B) $O_{2}^{2+}<O_{2}^{-}<O_{2}^{+}$

C) $O_{2}^{+}>O_{2}^{-}<O_{2}^{2+}$

D) $O_{2}^{-}<O_{2}^{+}>O_{2}^{2+}$

• question_answer71) The angular momentum of electrons in d orbital is equal to

A) $\sqrt{6}h$

B) $\sqrt{2}h$

C) $2\sqrt{3}h$

D) $0h$

• question_answer72) The ${{K}_{sp}}$ of $A{{g}_{2}}Cr{{O}_{4}},\,AgCl,\,AgBr$ and $AgI$ are respectively, $1.1\times {{10}^{-12}},1.8\times {{10}^{-10}}$ $5.0\times {{10}^{-13}},8.3\times {{10}^{-17}}$. Which one of the following salts will precipitate last if $AgN{{O}_{3}}$solution is added to the solution containing equal moles of $NaCl,NaBr,NaI$ and $N{{a}_{2}}CrC{{O}_{4}}$?

A) $Agl$

B) $AgCl$

C) $AgBr$

D) $A{{g}_{2}}Cr{{O}_{4}}$

• question_answer73) Which property of colloidal solution is independent of charge on the colloidal particles?

A) Coagulation

B) Electrophoresis

C) Electroosmosis

D) Tyndall effect

• question_answer74) Which of the following statements is correct for a reversible process in a state of equilibrium?

A) $\Delta G=-2.30RT\,\log K$

B) $\Delta G=2.30RT\,\log K$

C) $\Delta {{G}^{{}^\circ }}=-2.30RT\,\log K$

D) $\Delta {{G}^{{}^\circ }}=2.30RT\,\log K$

• question_answer75) Bithional is generally added to the soaps as an additive to function as a/an

A) softener

B) dryer

C) buffering agent

D) antiseptic

• question_answer76) The electrolytic reduction of nitrobenzene in strongly acidic medium produces

A) p-aminophenol

B) azoxybenzene

C) azobenzene

D) aniline

• question_answer77) In Duma's method for estimation of nitrogen, 0.25g of an organic compound gave 40 mL of nitrogen collected at 300 K temperature and 725 mm pressure. If the aqueous tension at 300 K is 25 mm, the percentage of nitrogen in the compound is

A) 17. 36

B) 18.20

C) 16.76

D) 15.76

• question_answer78) In which of the following compounds, the $C-Cl$ bond ionization shall give most stable carbonium ion?

A) B) C) D) • question_answer79) The reaction, $C{{H}_{3}}-\underset{\underset{C{{H}_{3}}}{\mathop{|}}\,}{\overset{\overset{C{{H}_{3}}}{\mathop{|}}\,}{\mathop{C}}}\,-O\,Na+C{{H}_{3}}C{{H}_{2}}Cl\xrightarrow[-NaCl]{}$ $C{{H}_{3}}-\underset{\underset{C{{H}_{3}}}{\mathop{|}}\,}{\overset{\overset{C{{H}_{3}}}{\mathop{|}}\,}{\mathop{C}}}\,-O+C{{H}_{2}}-C{{H}_{3}}$ is called

A) Williamson synthesis

B) Williamson continuous etherification process

C) Etard reaction

D) Gatterman-Koch reaction

• question_answer80) The reaction of ${{C}_{6}}{{H}_{5}}CH=CHC{{H}_{3}}$ with $HBr$ produces

A) ${{C}_{6}}{{H}_{5}}\underset{\underset{Br}{\mathop{|}}\,}{\mathop{C}}\,HC{{H}_{2}}C{{H}_{3}}$

B) ${{C}_{6}}{{H}_{5}}C{{H}_{2}}\underset{\underset{Br}{\mathop{|}}\,}{\mathop{C}}\,HC{{H}_{3}}$

C) ${{C}_{6}}{{H}_{5}}C{{H}_{2}}C{{H}_{2}}C{{H}_{2}}Br$

D) • question_answer81) A single compound of the structure is obtainable from ozonolysis of which of the following cyclic compounds?

A) B) C) D) • question_answer82) Treatment of cyclopentanone with methyl lithium gives which of the following species?

A) Cyclopentanonyl anion

B) Cyclopentanonyl cation

• question_answer83) Consider the following compounds

 (i) (ii) $Ph-\overset{\begin{smallmatrix} Ph \\ | \end{smallmatrix}}{\mathop{\underset{\centerdot }{\mathop{C}}\,}}\,-Ph$ (iii) hyperconjugation occurs in

A) I only

B) II only

C) III only

D) I and III

• question_answer84) Which of the following is the most correct electron displacement for a nucleophilic reaction to take place?

A) B) C) D) E) None of the above

• question_answer85) The enolic form of ethyl acetoacetate as below has A) 18 sigma bonds and 2 pi-bonds

B) 16 sigma bonds and 1 pi-bond

C) 9 sigma bonds and 2 pi-bonds

D) 9 sigma bonds and 1 pi-bond

• question_answer86) Given,   Which of the given compounds can exhibit tautomerism?

A) I and II

B) I and III

C) II and III

D) I, II and III   The enthalpy of hydrogenation of these compounds will be in the order as

A) I > II > III

B) III > II > I

C) II > III > I

D) II > I > III

• question_answer88) Biodegradable polymer which can be produced from glycine and aminocapric acid is

A) nylon 2-nylon 6

B) PHBV

C) buna-N

D) nylon-6, 6

• question_answer89) The total number of n- bond electrons in the following structure is A) 4

B) 8

C) 12

D) 16

• question_answer90) An organic compound X having molecular formula ${{C}_{5}}{{H}_{10}}O$ yields phenyl hydrazone and gives negative response to the iodoform test and Tollen's test. It produces n-pentane on reduction. X could be

A) pentanal

B) 2-pentanone

C) 3-pentanone

D) n-amyl alcohol

• question_answer91) Which one of the following matches is correct?

A)

 Phytophthora Aseptate mycelium Basidiomycetes

B)

 Altemaria Sexual reproduction absent Deuteromycetes

C)

 Mucor Reproduction by conjugation Ascomycetes

D)

 Agancus Parasitic fungus Basidiomycetes

• question_answer92) Read the following five statements (I to V) and. select the option with all correct statements.

 I. Mosses and lichens are the first organisms to colonize a bare rock. II. Selaginella is a homosporous pteridophyte. III. Coralloid roots in Cycas have VAM. IV. Main plant body in bryophytes is gametophytic, whereas in pteridophytes it is sporophytic. V. In gymnosperms, male and female gametophytes are present within sporangia located on sporophyte.

A) I, III and IV

B) II, III and IV

C) I, IV and V

D) II, III and V

• question_answer93) In which of the following gametophyte is not independent free-living?

A) Funaria

B) Marchantia

C) Pteris

D) Pinus

• question_answer94) Which one of the following statements is wrong?

A) Algin and carrageenan are products of algae

B) Agar-agar is obtained from Gelidium and Gracilaria

C) Chlorella and Spirulina are used as space food

D) Mannitol is stored food in Rhodophyceae

• question_answer95) The guts of cow and buffalo possess

A) Fucus sp

B) Chlorella sp

C) methanogens

D) cyanobacteria

• question_answer96) Male gametes are flagellated in

A) Polysiphonia

B) Anabaena

C) Ectocarpus

D) Spirogyra

• question_answer97) Vascular bundles in monocotyledons are considered closed because

A) a bundle surrounds each bundle

B) cambium is absent

C) there are no vessels with perforations

D) xylem is surrounded ail around by phloem

• question_answer98) is the floral formula of

A) Allium

B) Sesbania

C) Petunia

D) Brassica

• question_answer99) A major characteristic of the monocot root is the presence of

A) open vascular bundles

B) scattered vascular bundles

C) vasculature without cambium

D) cambium sandwiched between phloem and xylem along the radius

• question_answer100) Keel is the characteristic feature of flower of

A) tulip

B) Indigofera

C) Aloe

D) tomato

• question_answer101) Perigynous flowers are found in

A) guava

B) cucumber

C) China rose

D) rose

• question_answer102) Leaves become modified into spines in

A) Opuntia

B) pea

C) onion

D) silk cotton

• question_answer103) The structures that are formed by stacking of organized flattened membranous sacs in the chloroplasts are

A) cristae

B) grana

C) stroma lamellae

D) stroma

• question_answer104) The chromosomes in which centromere is situated close to one end are

A) metacentric

B) acrocentric

C) telocentric

D) sub-metacentric

• question_answer105) Select the correct matching in the following pairs.

A) Smooth ER-Oxidation of phospholipids

B) Smooth ER-Synthesis of lipids

C) Rough ER-Synthesis of glycogen

D) Rough ER-Oxidation of fatty acids

• question_answer106) True nucleus is absent in

A) Anabaena

B) Mucor

C) Vaucheria

D) Volvox

• question_answer107) Which one of the following is not an inclusion body found in prokaryotes?

A) Phosphate granule

B) Cyanophycean granule

C) Glycogen granule

D) Polysome

• question_answer108) Transpiration and root pressure cause water to rise in plants by

A) pulling it upward

B) pulling and pushing it, respectively

C) pushing it upward

D) pushing and pulling it, respectively

• question_answer109) Minerals known to be required in large amounts for plant growth include

A) phosphorus, potassium, sulphur, calcium

B) calcium, magnesium, manganese, copper

C) potassium, phosphorus, selenium, boron

D) magnesium, sulphur, iron, zinc

• question_answer110) What causes a green plant exposed to the light on only one side, to bend toward the source of light as it grows?

A) Green plants need light to perform photosynthesis

B) Green plants seek light because they are phototropic

C) Light stimulates plant cells on the lighted side to grow faster

D) Auxin accumulates on the shaded side, stimulating greater cell elongation there

• question_answer111) In a ring girdled plant

A) the shoot dies first

B) the root dies first

C) the shoot and root die together

D) Neither root nor shoot will die

• question_answer112) Typical growth curve in plants is

A) sigmoid

B) linear

C) stair-steps shaped

D) parabolic

• question_answer113) Which one gives the most valid and recent explanation for stomatal movements?

A) Transpiration

B) Potassium influx and efflux

C) Starch hydrolysis

D) Guard cell photosynthesis

• question_answer114) The hilum is a scar on the

A) seed, where funicle was attached

B) fruit, where it was attached to pedicel

C) fruit, where style was present

D) seed, where micropyle was present

• question_answer115) Which one of the following may require pollinators, but is genetically similar to autogamy?

A) Geitonogamy

B) Xenogamy

C) Apogamy

D) Cleistogamy

• question_answer116) Which one of the following statements is not true?

A) Pollen grains are rich in nutrients and they are used in the form of tablets and syrups

B) Pollen grains of some plants cause severe allergies and bronchial afflictions in some people

C) The flowers pollinated by flies and bats secrete foul odour to attract them

D) Honey is made by bees by digesting pollen collected from flowers

• question_answer117) Transmission tissue is characteristic feature of

A) hollow style

B) solid style

C) dry stigma

D) wet stigma

• question_answer118) In ginger vegetative propagation occurs through

A) rhizome

B) offsets

C) bulbils

D) runners

• question_answer119) Which of the following are the important floral rewards to the animal pollinators?

A) Colour and large size of flower

B) Nectar and pollen grains

C) Floral fragrance and calcium crystals

D) Protein pellicle and stigmatic exudates

• question_answer120) How many pairs of contrasting characters in pea plants were studied by Mendel in his experiments?

A) Five

B) Six

C) Eight

D) Seven

• question_answer121) Which is the most common mechanism of genetic variation in the population of a sexually reproducing organism?

A) Transduction

B) Chromosomal aberrations

C) Genetic drift

D) Recombination

• question_answer122) A technique of micropropagation is

A) somatic hybridisation

B) somatic embryogenesis

C) protoplast fusion

D) embryo rescue

• question_answer123) The movement of a gene from one linkage group to another is called

A) inversion

B) duplication

C) translocation

D) crossing over

• question_answer124) Multiple alleles are present

A) on different chromosomes

B) at different loci on the same chromosome

C) at the same locus of the chromosome

D) on non-sister chromatids

• question_answer125) Which body of the Government of India regulates GM research and safety of introducing GM organisms for public services?

A) Bio-safety committee

B) Indian Council of Agricultural Research

C) Genetic Engineering Approval Committee

D) Research Committee on Genetic Manipulation

• question_answer126) In Bt cotton, the Bt toxin present in plant tissue as pro-toxin is converted into active toxin due to

A) alkaline pH of the insect gut

B) acidic pH of the insect gut

C) action of gut microorganisms

D) presence of conversion factors in insect gut

• question_answer127) The crops engineered for glyphosate are resistant/tolerant to

A) fungi

B) bacteria

C) insects

D) herbicides

• question_answer128) DNA is not present in

A) chloroplast

B) ribosomes

C) nucleus

D) mitochondria

• question_answer129) Which of the following enhances or induces fusion of protoplasts?

A) Sodium chloride and potassium chloride

B) Polyethylene glycol and sodium nitrate

C) IAA and kinetin

D) IAA and gibberellins

• question_answer130) The UN Conference of Parties on climate change in the year 2011 was held in

A) Poland

B) South Africa

C) Peru

D) Qatar

• question_answer131) Vertical distribution of different species occupying different levels in a biotic community is known as

A) divergence

B) stratification

C) zonation

D) pyramid

• question_answer132) In which of the following both pairs have correct combination?

A) In situ conservation/National park Ex situ conservation/Botanical garden

B) In situ conservation/Cryopreservation Ex situ conservation/Wildlife sanctuary

C) In situ conservation/Seed bank Ex situ conservation/National park

D) In situ conservation/Tissue culture Ex situ conservation/Sacred groves

• question_answer133) Secondary succession takes place on/in

A) bara rock

C) newly created pond

D) newly cooled lava

• question_answer134) The mass of living material at a tropic level at a particular time is called

A) gross primary productivity

B) standing state

C) net primary productivity

D) standing crop

• question_answer135) In an ecosystem the rate of production of organic matter during photosynthesis is termed as

A) net primary productivity

B) gross primary productivity

C) secondary productivity

D) net productivity

• question_answer136) Which of the following characteristics is mainly responsible for diversification of insects on land

A) Segmentation

B) Bilateral symmetry

C) Exoskeleton

D) Eyes

• question_answer137) Which of the following endoparasites of humans does show viviparity?

A) Ancylostoma duodenale

B) Enterobius vermicularis

C) Trichinella spiralis

D) Ascaris lumbricoides

• question_answer138) Which of the following represent the correct combination without any exception?

A)

 Characteristic Class Mammary gland; hair on body; pinnae; two pairs of limbs Mammalia,

B)

 Characteristic Class Mouth ventral; gills without operculum; skin with placoid scales; persistent notochord Chondrichthyes

C)

 Characteristic Class Sucking and circular mouth; jaws absent integument without scales; paired appendages Cyclostomata

D)

 Characteristic Class Body covered with feathers; skin moist and glandular; lungs with air sacs fore limbs from wings; Aves

• question_answer139) Which of the following animals is not viviparous?

A) Flying fox (bat)

B) Elephant

C) Platypus

D) Whale

• question_answer140) Erythropoiesis starts in

A) kidney

B) liver

C) spleen

D) red bone marrow

• question_answer141) The terga sterna and pleura of cockroach body are joined by

A) cementing glue

B) muscular tissue

C) arthrodial membrane

D) cartilage

• question_answer142) Nuclear envelope is derivative of

A) smooth endoplasmic reticulum

B) membrane of Golgi complex

C) microtubules

D) rough endoplasmic reticulum

• question_answer143) Cytochromes are found in

A) matrix of mitochondria

B) outer wall of mitochondria

C) cristae of mitochondria

D) lysosomes

• question_answer144) Which one of the following statements is incorrect?

A) A competitive inhibitor reacts reversibly with the enzyme to form an enzyme-inhibitor.

B) In competitive inhibition the inhibitor molecule is not chemically changed by the enzyme.

C) The competitive inhibitor does not affect the rate of breakdown of the enzyme-substrate complex.

D) The presence of the competitive inhibitor decreases the km of the enzyme for the substrate.

• question_answer145) Match the following column I with column II.

 Column I Column II A. Synapsis aligns homologous chromosomes. 1. Anaphase-II B. Synthesis of RNA and protein 2. Zygotene C. Action of enzyme recombinase 3. ${{G}_{2}}$-phase D. Centromeres do not separate but chromatids move towards opposite poles. 4. Anaphase-I 5. Pachytene

A) A-2 B-1 C-3 D-4

B) A-2 B-3 C-5 D-4

C) A-1 B-2 C-5 D-4

D) A-2 B-3 C-4 D-5

• question_answer146) A somatic cell that has just completed the S-phase of its cell cycle, as compared to gamete of the same species has

A) twice the number of chromosomes and twice the amount of DNA

B) same number of chromosomes but twice the amount of DNA

C) twice the number of chromosomes and four times the amount of DNA

D) four times the number of chromosomes and twice the amount of DNA

• question_answer147) Which of the following statement is not correct?

A) Brunners glands are present in the submucosa of stomach and secrete pepsinogen

B) Goblet cells are present in the mucosa of intestine and secrete mucus

C) Oxyntic cells are present in the mucosa of stomach and secrete $HCl$.

D) Acini are present in the pancreas and secrete carboxypeptidase

• question_answer148) Gastric juice of infants contains

A) maltase, pepsinogen, rennin

B) nuclease, pepsinogen, lipase

C) pepsinogen, lipase, rennin

D) amylase, rennin, pepsinogen

• question_answer149) When you hold your breath which of the following gas changes in blood would first lead to the urge to breathe?

A) Falling ${{O}_{2}}$ concentration

B) Rising $C{{O}_{2}}$ concentration

C) Falling $C{{O}_{2}}$ concentration

D) Rising $C{{O}_{2}}$ and falling ${{O}_{2}}$ concentration

• question_answer150) Blood pressure in the mammalian aorta is maximum during

A) systole of the left atrium

B) diastole of the right ventricle

C) systole of the left ventricle

D) diastole of the right atrium

• question_answer151) Which one of the following is correct?

A) Plasma = Blood - Lymphocytes

B) Serum = Blood + Fibrinogen

C) Lymph = Plasma + RBC + WBC

D) Blood = Plasma + RBC + WBC + Platelets

• question_answer152) Removal of proximal convoluted tubule from the nephron will result in

A) more diluted urine

B) more concentrated urine

C) no change in quality and quantity of urine

D) no urine formation

• question_answer153) Sliding filament theory can be best explained as

A) when myofilaments slide pass each other actin filaments shorten while myosin filament do not shorten

B) actin and myosin filaments shorten and slide pass each other

C) actin and myosin filaments do not shorten but rather slide pass each other

D) when myofilament slide pass each other myosin filament shorten while actin filaments do not shorten

• question_answer154) Glenoid cavity articulates

A) clavicle with acromion

B) scapula with acromion

C) clavicle with scapula

D) humerus with scapula

• question_answer155) Which of the following regions of the brain is incorrectly paired with its function

A) Medulla oblongata-Homeostatic control

B) Cerebellum-Language comprehension

C) Corpus callosum-Communication between the left and right cerebral cortices

D) Cerebrum-Calculation and contemplation

• question_answer156) A gymnast is able to balance his body upside down even in the total darkness because of

A) cochlea

B) vestibular apparatus

C) tectorial membrane

D) organ of Corti

• question_answer157) A chemical signal that has both endocrine and neural roles is

A) melatonin

B) calcitonin

C) epinephrine

D) cortisol

• question_answer158) Which of the following does not favour the formation of large quantities of dilute urine?

A) Alcohol

B) Caffeine

C) Renin

D) Atrial-natriuretic factor

• question_answer159) Capacitation refers to changes in the

A) sperm before fertilization

B) ovum before fertilization

C) ovum after fertilization

D) sperm after fertilization

• question_answer160) Which of these is not an important component of initiation of parturition in humans?

A) Increase in oestrogen and progesterone ratio

B) Synthesis of prostaglandins

C) Release of oxytocin

D) Release of prolactin

• question_answer161) Which of the following viruses is not transferred through semen of an infected male?

A) Hepatitis-B virus

B) Human immunodeficiency virus

C) Chikungunya virus

D) Ebola virus

• question_answer162) Which of the following cells during gametogenesis is normally diploid?

A) Primary polar body

B) Spermatid

C) Spermatogonia

D) Secondary polar body

• question_answer163) Hysterectomy is surgical removal of

A) uterus

B) prostate gland

C) vas deference

D) mammary glands

• question_answer164) Which of the following is not a sexually transmitted disease?

A) Syphilis

B) Acquired Immuno Deficiency Syndrome (AIDS)

C) Trichomoniasis

D) Encephalitis

• question_answer165) An abnormal human baby with XXX sex chromosomes was born due to

A) formation of abnormal sperms in the father

B) formation of abnormal ova in the mother

C) fusion of two ova and one sperm

D) fusion of two sperms and one ovum

• question_answer166) Alleles are

A) different phenotype

B) true breeding homozygotes

C) different molecular forms of a gene

D) heterozygotes

• question_answer167) A man with blood group A marries a woman with blood group B. What are all the possible blood groups of their offsprings?

A) A and B

B) A, B and AB

C) A, B, AB and O

D) Only O

• question_answer168) Gene regulation governing lactose operon of E. coli that involves the lac I gene products is

A) positive and inducible because it can be induced by lactose

B) negative and inducible because repress or protein prevents transcription

C) negative and repressive because repress or protein prevents transcription

D) feedback inhibition because excess of $\beta$-galactosidase can switch off transcription

• question_answer169) In sea urchin DNA, which is double stranded 17% of the bases were shown to be cytosine. The percentages of the other three bases expected to be present in this DNA are

A) G/34%, A/24.5%, T/24.5%

B) G/17%, A/16.5%, T/32.5%

C) G/17%, A/33%, T/33%

D) G/8.5%, A/50%, T/24.5%

• question_answer170) Which of the following had the smallest brain capacity?

A) Homo erectus

B) Homo sapiens

C) Homo neanderthalensis

D) Homo habilis

• question_answer171) A population will not exist in Hardy-Weinberg equilibrium if

A) individuals mate selectively

B) there are no mutations

C) there is no migration

D) the population is large

• question_answer172) Match each disease with its correct type of vaccine.

 Column I Column II A. Tuberculosis 1.Harmless virus B. Whooping cough 2.Inactivated toxin C. Diphtheria 3.Killed bacteria D. Polio 4.Harmless bacteria

A) A-2 B-1 C-3 D-4

B) A-3 B-2 C-4 D-1

C) A-4 B-3 C-2 D-1

D) A-1 B-2 C-4 D-3

• question_answer173) HIV that causes AIDS, first starts destroying

A) B-lymphocytes

B) leucocytes

C) helper T-lymphocytes

D) thrombocytes

• question_answer174) The active form of Entamoeba histolytica feed upon

A) erythrocytes mucosa and submucosa of colon

B) mucosa and submucosa of colon only

C) food in intestine

D) blood only

• question_answer175) High value of BOD (Biochemical Oxygen Demand) indicates that

A) water is pure

B) water is highly polluted

C) water is less polluted

D) consumption of organic matter in the water is higher by the microbes

• question_answer176) Most animal are tree dwellers in a

A) coniferous forest

B) thorn woodland

C) temperate deciduous forest

D) tropical rain forest

• question_answer177) The following graph depicts changes in two populations (A and B) of herbivores in grassy field A possible reason for these changes is that A) both plant populations in this habitat decreased

B) population-B competed more successfully for food than population-A

C) population-A produced more offspring than population-B

D) population-A consumed the members of population-B

• question_answer178) Cryopreservation of gametes of threatened species in viable and fertile condition can be referred to as

A) in situ conservation of biodiversity

B) advanced ex situ conservation of biodiversity

C) in situ conservation by sacred groves

D) in situ cryo-conservation of biodiversity

• question_answer179) Rachel Carsons famous book Silent Spring is related to

A) pesticide pollution

B) noise pollution

C) population explosion

D) ecosystem management

• question_answer180) Which of the following is not one of prime health risks associated with greater radiation through the atmosphere due to depletion of stratospheric zone?

A) Increased skin cancer

B) Reduced immune system

C) Damage to eyes

D) Increased liver cancer

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