# Solved papers for AMU Medical AMU Solved Paper-1999

### done AMU Solved Paper-1999

• question_answer1) Four particles of masses m, 2m, 3m and 4m are arranged at the corners of a parallelogram with each side equal to a and one of the angle between two adjacent sides as$60{}^\circ$. The parallelogram lies in the $x-y$ plane with mass m at the origin and 4m on the $x-$axis. The centre of mass of the arrangement will be located at

A) $\left( \frac{\sqrt{3}}{2}a,0.95a \right)$

B) $\left( 0.95a,\frac{\sqrt{3}}{4}a \right)$

C) $\left( \frac{3a}{4},\frac{a}{2} \right)$

D) $\left( \frac{a}{2},\frac{3a}{4} \right)$

• question_answer2) A 20 kg block is initially at rest on a rough horizontal surface. A horizontal force of 75 N is required to set the block in motion. After it is in motion, a horizontal force of 60 N is required to keep the block moving with constant speed. The coefficient of static friction is

A) 0.38

B) 0.44

C) 0.52

D) 0.60

• question_answer3) The total kinetic energy of a rolling sphere having translational velocity V is

A) $\frac{7}{10}M{{V}^{2}}$

B) $\frac{1}{2}M{{V}^{2}}$

C) $\frac{2}{5}M{{V}^{2}}$

D) $\frac{10}{7}M{{V}^{2}}$

• question_answer4) An elastic string has length$\beta$when subjected to 5 N tension. Its length is a when tension 4 N. When subjected to a tension of 9 N, its length will become

A) $9(\beta -\alpha )$

B) $5\alpha -4\beta$

C) $5\beta -4\alpha$

D) $\beta -\alpha$

• question_answer5) During a journey from earth to moon and back, the greatest energy required from the rocket of the space ship is to overcome

A) the moons gravity at lunar landing

B) the moons gravity at lunar take off

C) the earths gravity at re-entry into earths atmosphere

D) the earths gravity at take off

• question_answer6) A ball is rolled off the edge of a horizontal table at a speed of 4 m/second. It hits the ground after 0.4 second. Which statement given below is not true?

A) it hits the ground at a horizontal distance 1.6 m from the edge of the table

B) the speed with which it hits the ground is 0.4m/second

C) height of the table is 0.8 m

D) it hits the ground at an angle of$45{}^\circ$to the horizontal

• question_answer7) A body of mass M kg initially at rest explodes into three fragments having masses in the ratio$3:1:1$. The two equal mass fragments fly off at right angles to each other with equal speed of 60 m/s. The speed of the heavier fragment is

A) $30\sqrt{2}\,m/s$

B) $10\sqrt{2}\,m/s$

C) $20\sqrt{2}\,m/s$

D) $20\,m/s$

• question_answer8) Three masses are connected (as Shown) on a horizontal frictionless surface and pulled by a force of 60 N. The tensions${{T}_{1}}$and${{T}_{2}}$are in the ratio

A) $1:1$

B) $1:5$

C) $1:4$

D) $4:5$

• question_answer9) A body is moved along a straight line by a machine which delivers constant power. The distance moved by the body in time$t$is proportional to

A) $t$

B) ${{t}^{1/2}}$

C) ${{t}^{5/2}}$

D) ${{t}^{3/2}}$

• question_answer10) If the speed of light [c], acceleration due to gravity [g] and pressure [P] are taken as the fundamental quantities, then the dimension of gravitational constant is

A) ${{c}^{2}}{{g}^{0}}{{p}^{-2}}$

B) ${{c}^{0}}{{g}^{2}}{{p}^{-1}}$

C) $c{{g}^{3}}{{p}^{-2}}$

D) $c{{g}^{0}}{{p}^{-1}}$

• question_answer11) If the kinetic energy of one mole of an ideal gas is given as$E=\frac{3}{2}RT$ (where 7? is the universal gas constant and T is the absolute temperature of the gas), the molar specific heat at constant pressure will be given as

A) $2.5\text{ }R$

B) $1.5\text{ }R$

C) $0.5\text{ }R$

D) $0.1\text{ }R$

• question_answer12) Which one of the following statement is true?

A) for monoatomic gases $\gamma =1.40$

B) for diatomic gases ${{C}_{p}}-{{C}_{V}}=2\text{ }cal$

C) for polyatomic gases $\gamma =1.67$

D) for all the gases ${{C}_{p}}=4R$

• question_answer13) A Carnot engine working between 300 K and 600 K has a work output of 800 joules per cycle. The amount of heat energy supplied from the source to the engine in each cycle is

A) 6400 joule

B) 1600 joule

C) 3200 joule

D) 800 joule

• question_answer14) Oxygen and hydrogen gases are at the same temperature and pressure. The oxygen molecule has 16 times the mass of hydrogen molecule. The ratio of the root mean square velocity of oxygen molecule to that of hydrogen molecule will be

A) 16

B) 4

C) 2

D) 1/4

• question_answer15) A thin metal disc of radius r floats on water surface and bends the surface downwards along the perimeter making an angle$\theta$with verticle edge of the disc. If the disc displaces a weight of water W and surface tension of water is T, then the weight of metal disc is

A) $2\pi rT+W$

B) $2\pi rT\cos \theta -W$

C) $2\pi rT\cos \theta +W$

D) $W-2\pi rT\cos \theta$

• question_answer16) A block of mass is suspended from a spring balance. When the block is in air the balance reads 120 N. When it is immersed in water the reading changes to 80 N. The relative density of the material of the block is

A) 6

B) $\frac{6}{2}$

C) $\frac{6}{3}$

D) $\frac{6}{4}$

• question_answer17) A 10 cm long wire is placed horizontally on the surface of water and is gently pulled up with a force of $2\times {{10}^{-2}}N$to keep the wire in equilibrium. The surface tension, in$N{{m}^{-1}}$of water is

A) 0.1

B) 0.2

C) 0.001

D) 0.002

• question_answer18) Radius of gyration of uniform thin rod of length about an axis passing normally through its centre of mass is

A) $\frac{L}{\sqrt{12}}$

B) $\frac{L}{12}$

C) $\sqrt{12}L$

D) $12L$

• question_answer19) An artificial satellite is placed into a circular orbit around earth at such a height that it always remains about a definite place on the surface of earth. Its height from the surface of earth is

A) 6400 km

B) 4800 km

C) 32000km

D) 36000km

• question_answer20) A pendulum bob of mass 50 gm is suspended from the ceiling of an elevator. The tension in the string if the elevator goes up with uniform velocity is approximately

A) 0.30 N

B) 0.40 N

C) 0.42 N

D) 0.50 N

• question_answer21) An infinite ladder network is arranged with resistances$R$and$2R$as shown. The effective resistance between terminals A and B is

A) $\infty$

B) $R$

C) $2R$

D) $3R$

• question_answer22) A wire of resistance$1\,\Omega$is stretched to double its length. The resistance of the wire will become

A) $1\,\Omega$

B) $\frac{1}{4}\,\Omega$

C) $2\,\Omega$

D) $4\,\Omega$

• question_answer23) The electric field in a region is radially outward with magnitude$E=Ar$. The charge contained in a sphere of radius${{r}_{0}}$centered at the origin is

A) $\frac{1}{4\pi {{\varepsilon }_{0}}}Ar_{0}^{3}$

B) $4\pi {{\varepsilon }_{0}}\,Ar_{0}^{3}$

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

D) $\frac{1}{4\pi {{\varepsilon }_{0}}}.\frac{A}{r_{0}^{3}}$

• question_answer24) If a slab of insulating material$4\times {{10}^{-3}}$m thick is introduced between the plates of a parallel plate capacitor, the separation between plates has to be increased by$3.5\times {{10}^{-3}}$m to restore the capacity to original value. The dielectric constant of the material will be

A) 6

B) 8

C) 10

D) 12

• question_answer25) What is the potential energy of the equal positive point charges of$1\,\mu C$each held 1 m apart in air?

A) $9\times {{10}^{-3}}J$

B) $9\times {{10}^{-3}}eV$

C) $1J$

D) zero

• question_answer26) A whistle of frequency 500 Hz tied to the end of a string of length 1.2 m revolves at 400 revolutions per minute. If the velocity of sound is 340 m/sec, a listener standing some distance away in the plane of rotation of the whistle hears the frequencies in the range

A) 436 to 586 Hz

B) 426 to 574 Hz

C) 436 to 574 Hz

D) 426 to 586 Hz

• question_answer27) A stationary wave is expressed as $y=4\sin \left( \frac{\pi x}{3} \right)\cos (40\pi t)$ where$x$ and y are measured in cm and time t in second. The separation between consecutive nodes is

A) 1.5 cm

B) 6 cm

C) 12 cm

D) 3 cm

• question_answer28) A$1.00\times {{10}^{-20}}kg$particle is vibrating with simple harmonic motion with a period of$1.00\times {{10}^{-5}}$s and a maximum speed of$1.00\times {{10}^{3}}m/s$. The maximum displacement of the particle is

A) 1.59mm

B) 1.00m

C) 10 m

D) none of the above

• question_answer29) A Simple harmonic wave is represented by the relation$y=a\sin 2\pi \left( pt-\frac{x}{\lambda } \right)$where a and y are measured in cm and time$t$in seconds. The maximum particle velocity is five times the wave velocity. The wavelength of the wave is

A) $\frac{2\pi a}{\sqrt{5}}cm$

B) $\frac{2\pi a}{5}cm$

C) $\frac{\pi a}{5}cm$

D) $2\sqrt{5}\pi a\,cm$

• question_answer30) A slab of thickness${{d}_{1}}$and coefficient of thermal conductivity${{K}_{1}}$. is placed in contact with another slab of thickness${{d}_{2}}$and coefficient of thermal conductivity${{K}_{2}}$. In steady state, the conductivity of composite slab will be

A) $\frac{{{d}_{1}}+{{d}_{2}}}{{{K}_{1}}+{{K}_{2}}}$

B) $\frac{{{K}_{1}}{{K}_{2}}}{{{K}_{1}}{{d}_{2}}+{{K}_{2}}{{d}_{1}}}$

C) $\frac{{{K}_{1}}{{d}_{1}}+{{K}_{2}}{{d}_{2}}}{{{d}_{1}}+{{d}_{2}}}$

D) $\frac{{{d}_{1}}+{{d}_{2}}}{\left( \frac{{{d}_{1}}}{{{K}_{1}}}+\frac{{{d}_{2}}}{{{K}_{2}}} \right)}$

• question_answer31) What is the frequency of radio waves corresponding to 10 m wavelength?

A) $3\times {{10}^{9}}Hz$

B) $3.3\times {{10}^{-8}}Hz$

C) $3\times {{10}^{7}}Hz$

D) $3.4\times {{10}^{-7}}Hz$

• question_answer32) A monochromatic light beam of wavelength 2537 A is falling normally on a metal plate. If the maximum velocity of emitted photoelectron is $1.6\times {{10}^{5}}m/sec$ and a constant magnetic field of strength ${{10}^{-4}}$ $weber/{{m}^{2}}$is applied parallel to metal surface, the radius of the largest circular path of photoelectrons is

A) 0.61 m

B) 0.61 cm

C) $6.1\times {{10}^{-4}}m$

D) $6.1\times {{10}^{-5}}m$

• question_answer33) Suppose electromagnetic waves having speed $2.5\times {{10}^{8}}$m/sec are travelling in a medium of relative permeability 0.8. The relative permitivity is

A) 1.0

B) 1.8

C) 2.5

D) none of these

• question_answer34) The effective value of A.C. in a circuit is 10 A. The peak value of current is

A) 5 A

B) 0.707 A

C) 10 A

D) 14.14 A

• question_answer35) An LC circuit contains a 40 mH inductor and a $25\,\mu F$capacitor. The resistance of the circuit is negligible. The energy stored in the circuit is completely magnetic at times (in milliseconds). The time is measured from the instant the circuit is closed

A) 0, 3.14, 6.28

B) 0, 1.57, 4.71

C) 1.57, 4.71, 7.85

D) none of the above

• question_answer36) A cyclotron is accelerating proton, where the applied magnetic field is 2 T, the potential gap is 100 kV then how much turn the proton has to move between the dees to acquire a kinetic energy of 20 MeV

A) 100

B) 150

C) 200

D) 300

• question_answer37) The magnetic induction in the region between the pole faces of an electromagnet is 0.7 weber/${{m}^{2}}$. The induced e.m.f. in a straight conductor 10 cm long, perpendicular to B and moving perpendicular both to magnetic induction and its own length with a velocity 2 m/sec is

A) 0.08 V

B) 0.14V

C) 0.35 V

D) 0.07 V

• question_answer38) A circular coil of diameter 7cm has 24 turns of wire carrying current of 0.75A. The magnetic moment of the coil is

A) $6.9\times {{10}^{-2}}A{{m}^{2}}$

B) $2.3\times {{10}^{-2}}A{{m}^{2}}$

C) ${{10}^{-2}}A{{m}^{2}}$

D) ${{10}^{-3}}A{{m}^{2}}$

• question_answer39) A certain current passing through a copper voltameter deposits 0.002 kg of copper on cathode plate in 100 minutes. If there are${{10}^{25}}$ copper atoms in 1kg of copper, the electric charge delivered to cathode by copper ions$(C{{u}^{2+}})$per second will be

A) 1.06 C

B) 2.13 C

C) 0.53 C

D) 0.71 C

• question_answer40) A current$i$passes through a wire of length$l$, radius of cross-section r, and resistivity $\rho$. The rate of heat generation is

A) $\frac{{{i}^{2}}l\rho }{\pi {{r}^{2}}}$

B) ${{i}^{2}}{{\left( \frac{l\rho }{\pi {{r}^{2}}} \right)}^{2}}$

C) ${{i}^{2}}l\rho /r$

D) $il\rho /r$

• question_answer41) The star Sirius is emitting radiation with the radiant intensity (energy emitted per unit area per second) of$1.2\times {{10}^{7}}W/{{m}^{2}}$the colour of this star will be

A) blue

B) yellow

C) green

D) red

• question_answer42) Transistors provide good power amplification when they are used in

A) common emitter configuration

B) common base configuration

C) common collector configuration

D) none of the above

• question_answer43) The following combination of gates is equivalent to which of the following gate

A) XOR

B) OR

C) NAND

D) none of the above

• question_answer44) When a hydrogen atom is raised from the ground state to an excited state

A) both kinetic energy and potential energy increase

B) both kinetic energy and potential energy decrease

C) potential energy increases, kinetic energy decreases

D) potential energy decreases, kinetic energy increases

• question_answer45) A freshly prepared radioactive substance of half-life half an hour emits radiation of intensity thirty two times the permissible safe limit. The minimum time after which it would be safe to work with the substance is

A) 3 hours

B) 6 hours

C) 2 hours

D) 8 hours

• question_answer46) Consider the following two statements [A] Energy spectrum of a particles emitted in radioactive decay is discrete [B] Energy spectrum of P particles emitted in radioactive decay is continuous

A) only A is correct

B) only B is correct

C) A is correct but B is wrong

D) both A and B are correct

• question_answer47) An oil drop having charge 2e is kept stationary between two parallel horizontal plates 2.0 cm apart when a potential difference of 12000 volts is applied between them. If the density of oil is$900\text{ }kg/{{m}^{3}}$, the radius of the drop will be

A) $2.0\times {{10}^{-6}}m$

B) $1.7\times {{10}^{-6}}m$

C) $1.4\times {{10}^{-6}}m$

D) $1.1\times {{10}^{-6}}m$

• question_answer48) Energy required to remove an electron from aluminium surface is 4.2 eV. If light of wavelength 2000 A falls on the surface, the velocity of the fastest electron ejected from the surface will be

A) $8.4\times {{10}^{5}}$m/second

B) $7.4\times {{10}^{5}}$m/second

C) $6.4\times {{10}^{5}}$m/second

D) $8.4\times {{10}^{6}}$m/second

• question_answer49) A convex lens is used to form real image of an object on a screen. It is observed that even when the positions of the object and the screen are fixed there are two positions of the lens to form real images. If the heights of the images are 4 cm and 9cm respectively, the height of the objective is;

A) 2.25 cm

B) 6.00 cm

C) 6.50 cm

D) 36.00 cm

• question_answer50) A compound microscope is 20 cm long and the power of its eye-piece is 20 D. If the objective is bi-convex (radius of curvature of either surface 2 cm) and made of a material of = 1.5, the magnifying power of the microscope is

A) 54

B) 60

C) 13.5

D) 41.5

• question_answer51) The internal energy of a system is the sum of

A) vibrational energy and electronic energy

B) vibrational energy and rotational energy

C) vibrational energy, rotational energy, electronic energy and translational energy

D) rotational energy and electronic energy

• question_answer52) The maximum number of permissible rotational orientations of the Is electron of lithium atom in ground state is

A) 1

B) 2

C) 3

D) 4

• question_answer53) Which of the following is the correct bond order for$N_{2}^{2-}$ion?

A) 2.5

B) 2.0

C) 3.0

D) 1.5

• question_answer54) Of the following iso-electronic ions, the one which has the lowest ionization potential is

A) $N{{a}^{+}}$

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

C) ${{F}^{-}}$

D) ${{O}^{--}}$

• question_answer55) What is the effect of more electronegative atom on the strength of ionic bond?

A) decreases

B) increases

C) remains same

D) any one of these

• question_answer56) If we consider the ammonia molecule to be $s{{p}^{3}}$ hybridized, the lone pair will occupy

A) an s-orbital

B) a p-orbital

C) a$s{{p}^{2}}-$hybridized orbital

D) a$s{{p}^{3}}-$hybridized orbital

• question_answer57) Rate constants of some reactions are given below. Predict which one indicates third order of reaction?

A) $k=8.7\times {{10}^{-3}}mo{{l}^{-1}}L{{s}^{-1}}$

B) $k=6.5\times {{10}^{-4}}mol{{L}^{-1}}{{s}^{-1}}$

C) $k=5.3\times {{10}^{-5}}{{s}^{-1}}$

D) $k=2.52\times {{10}^{-32}}mo{{l}^{-2}}{{L}^{2}}{{s}^{-1}}$

• question_answer58) A zinc rod is placed in 0.095 M solution of zinc sulphate at 298 K, the potential of the electrode at this temperature is[$E_{Zn}^{o}=-0.76$volts]

A) $-0.79$volts

B) $-0.69$volts

C) $-0.59$volts

D) $-0.49$volts

• question_answer59) Which of the following hydrogen bonds are strongest in vapour phase?

A) $HF---HF$

B) $HF---HCl$

C) $HCl---HCl$

D) $HF---HI$

• question_answer60) A primary alcohol,${{C}_{3}}{{H}_{8}}O$ on heating with sulphuric acid undergo dehydration to give an alkene, B.B when reacted with$HCl$gave C, which on treatment with aqueous KOH gives compound $D,{{C}_{3}}{{H}_{8}}O.A$and D are

A) functional isomers

B) position isomers

C) chain isomers

D) stereo isomers

• question_answer61) In the series of bivalent hydrides of sixteenth group elements

A) volatility increases from${{H}_{2}}O$to${{H}_{2}}S$and then decreases

B) volatility increases from${{H}_{2}}O$to ${{H}_{2}}Se$

C) volatility decreases from${{H}_{2}}O$to${{H}_{2}}Se$

D) none of the above

• question_answer62) Of the aliphatic compound carrying the following functional groups the one which cannot exhibit position isomerism is

A) carbon-carbon double bond

B) carbon-carbon triple bond

C) keto group

D) carboxylic acid group

• question_answer63) When ethanol is subjected to dehydration in presence of${{H}_{2}}S{{O}_{4}},$the intermediate formed is a

A) carbonium ion

B) carbanion

D) carbine

• question_answer64) Which of the following can act as an acid and as a base?

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

B) ${{H}_{2}}PO_{4}^{-}$

C) Both (a) and (b)

D) None of these

• question_answer65) $200\text{ }c{{m}^{3}}$of an aqueous solution of a protein contains 1.26 g. of protein. The O.P. of such a solution at 300 K is found to be$2.57\times {{10}^{-3}}$atm. Molar mass of protein is

A) $60287\text{ }g.mo{{l}^{-1}}$

B) $30242.\text{ }g.mo{{l}^{-1}}$

C) $40404\text{ }g.\text{ }mo{{l}^{-1}}$

D) $50404\text{ }g.\text{ }mo{{l}^{-1}}$

• question_answer66) What is the magnetic moment for$M{{n}^{2+}}$ion in low spin state?

A) 5.90 BM

B) 8.90 BM

C) 2.8 BM

D) 1.73 BM

• question_answer67) On mole of a gas absorbs 300 J of heat at constant volume and its temperature is raised from 30 to$35{}^\circ C$. The value of$\Delta E$is

A) 300 joules

B) 0.1 joules

C) 150 joules

D) 200 joules

• question_answer68) In which of the following conditions a chemical reaction can not occur?

A) $\Delta H$ and$\Delta S$increase and$T\Delta S>\Delta H$

B) $\Delta H$and$\Delta S$decrease and $\Delta H>T\Delta S$

C) $\Delta H$increases and$\Delta S$increases

D) $\Delta H$decreases and$\Delta S$increases

• question_answer69) If the melting point of ice is$0{}^\circ C$and latent heat of fusion is$5.46\text{ }kJ\text{ }mo{{l}^{-1}}$, the entropy change for the conversion of 18 g of ice to water at one atmosphere is

A) $5.46\text{ }J{{K}^{-1}}$

B) $20\text{ }J{{K}^{-1}}$

C) $50\text{ }J{{K}^{-1}}$

D) $\text{360 }J{{K}^{-1}}$

• question_answer70) Calculate the uncertainty in the velocity of a cricket ball of 100 g if the uncertainty in its position is$1.65\text{ }\overset{o}{\mathop{\text{A}}}\,$.

A) $1.657\pi \times {{10}^{-43}}m/s$

B) $\frac{6.6}{\pi }\times {{10}^{-45}}m/s$

C) $\frac{{{10}^{-23}}}{\pi }m/s$

D) $\frac{{{10}^{-26}}}{\pi }m/s$

• question_answer71) The correct order of basicity of amines in water is

A) $C{{H}_{3}}N{{H}_{2}}>{{(C{{H}_{3}})}_{2}}NH>{{(C{{H}_{3}})}_{3}}N$

B) ${{(C{{H}_{3}})}_{3}}N>{{(C{{H}_{3}})}_{2}}NH>C{{H}_{3}}N{{H}_{2}}$

C) ${{(C{{H}_{3}})}_{2}}NH>{{(C{{H}_{3}})}_{3}}N>C{{H}_{3}}N{{H}_{2}}$

D) none of the above

• question_answer72) Solubility of lead chloride is K. Then the number of moles of $C{{l}^{-}}$ionsin 1000 ml of saturated lead chloride solution will be

A) ${{\left( \frac{K}{4} \right)}^{1/3}}$

B) ${{(2K)}^{1/3}}$

C) ${{K}^{1/2}}$

D) $\frac{K}{2}$

• question_answer73) The compounds that will undergo Cannizzaro reaction are 1. $C{{H}_{3}}CHO$ 2. ${{(C{{H}_{3}})}_{3}}CCHO$ 3. $PhCHO$ 4. $C{{H}_{3}}COC{{H}_{3}}$

A) 1 and 2

B) 1 and 3

C) 2 and 3

D) 2 and 4

• question_answer74) The freezing point of a 0.01 m aqueous glucose solution at 1 atmosphere is$-0.18{}^\circ C$. To it, an addition of equal volume of 0.002 m glucose solution will produce a solution with freezing point of nearly

A) $-0.036{}^\circ C$

B) $-0.108{}^\circ C$

C) $-0.216{}^\circ C$

D) $-0.422{}^\circ C$

• question_answer75) 60 J of heat flows out from 600 g. of${{H}_{2}}O$at $30{}^\circ C$into the surroundings at$25{}^\circ C$. The total entropy change in the universe due to this process is

A) $0.1\text{ }J{{K}^{-1}}$

B) $0.5\text{ }J{{K}^{-1}}$

C) $0.9J{{K}^{-1}}$

D) $1.0\text{ }J{{K}^{-1}}$

• question_answer76) Which of the following is a better electron pair donor?

A) $P{{(C{{H}_{3}})}_{3}}$

B) $P{{H}_{3}}$

C) $N{{(C{{H}_{3}})}_{3}}$

D) $N{{H}_{3}}$

• question_answer77) The compounds that will give an isomer of 2,2- dimethylpropane on catalytic hydrogenation are (1) $C{{H}_{3}}CH=\underset{\begin{smallmatrix} | \\ C{{H}_{3}} \end{smallmatrix}}{\mathop{C}}\,-C{{H}_{3}}$ (2) $C{{H}_{3}}CH=CHC{{H}_{3}}$ (3) $C{{H}_{3}}CH=CHC{{H}_{2}}C{{H}_{3}}$ (4) $C{{H}_{3}}\underset{\begin{smallmatrix} | \\ C{{H}_{3}} \end{smallmatrix}}{\mathop{C}}\,=\underset{\begin{smallmatrix} | \\ C{{H}_{3}} \end{smallmatrix}}{\mathop{C}}\,-C{{H}_{3}}$

A) 1 and 4

B) 2 and 4

C) 1 and 3

D) 1 and 2

• question_answer78) What is the correct mode of hybridization of the central atom in the following compounds?

A) $NO_{2}^{+}$ - $s{{p}^{2}}$ $S{{F}_{4}}$ - $s{{p}^{3}}$ $PF_{6}^{-}$ - ${{d}^{2}}s{{p}^{3}}$

B) $NO_{2}^{+}$ - $s{{p}^{3}}$ $S{{F}_{4}}$ - $s{{p}^{3}}{{d}^{2}}$ $PF_{6}^{-}$ - $s{{p}^{3}}{{d}^{2}}$

C) $NO_{2}^{+}$ - $sp$ $S{{F}_{4}}$ - $s{{p}^{3}}d$ $PF_{6}^{-}$ - $s{{p}^{3}}{{d}^{2}}$

D) $NO_{2}^{+}$ - $sp$ $S{{F}_{4}}$ - $s{{p}^{2}}$ $PF_{6}^{-}$ - $s{{p}^{3}}$

• question_answer79) Which of the following statements is correct?

A) $S{{F}_{4}}$is polar and nonreactive

B) $S{{F}_{6}}$is nonpolar and very reactive

C) $S{{F}_{6}}$is a strong fluorinating agent

D) $S{{F}_{4}}$is prepared by fluorinating$SC{{l}_{2}}$with$NaF$

• question_answer80) An ionic compound$XY$has a structure of ZnS type. If the radius of${{X}^{+}}$is 22.5 pm. The ideal radius of$Y-$will be

A) 100 pm

B) 50 pm

C) 20 pm

D) 30 pm

• question_answer81) The pH of a soft drink is 3.82. The hydrogen ion concentration of the drink is (Antilog 0.18=1.5)

A) $1.96\times {{10}^{-2}}mole\text{ }li{{t}^{-1}}$

B) $1.96\times {{10}^{-3}}mole\text{ }li{{t}^{-1}}$

C) $1.5\times {{10}^{-4}}mole\text{ }li{{t}^{-1}}$

D) $1.5\times {{10}^{-3}}mole\text{ }li{{t}^{-1}}$

• question_answer82) If an amide is treated with${{P}_{2}}{{O}_{5}}$the likely product is an

A) acid

B) alkyl cyanide

C) amine

D) acid anhydride

• question_answer83) The polymer used for making contact lenses for eyes is

A) poly methyl methacrylate

B) polyethylene

C) polyethyl acrylate

D) nylon 6

• question_answer84) Silver sulphide dissolves in a solution of sodium cyanide to form the complex

A) $Na[Ag{{(CN)}_{2}}]$

B) $N{{a}_{3}}[Ag{{(CN)}_{4}}]$

C) $N{{a}_{5}}[Ag{{(CN)}_{6}}]$

D) $N{{a}_{2}}[Ag{{(CN)}_{2}}]$

• question_answer85) The compound that can be formed by aldol condensation of acetaldehyde is

A) $C{{H}_{3}}-\underset{\begin{smallmatrix} || \\ O \end{smallmatrix}}{\mathop{C}}\,-C{{H}_{2}}-\underset{\begin{smallmatrix} || \\ O \end{smallmatrix}}{\mathop{C}}\,-H$

B) $C{{H}_{3}}-\underset{\begin{smallmatrix} || \\ O \end{smallmatrix}}{\mathop{C}}\,-C{{H}_{2}}-COOH$

C) $C{{H}_{3}}-C{{H}_{2}}-\underset{\begin{smallmatrix} | \\ OH \end{smallmatrix}}{\mathop{CH}}\,-\underset{\begin{smallmatrix} || \\ O \end{smallmatrix}}{\mathop{C}}\,-H$

D) $C{{H}_{3}}-\underset{\begin{smallmatrix} | \\ OH \end{smallmatrix}}{\mathop{CH}}\,-C{{H}_{2}}-\underset{\begin{smallmatrix} || \\ O \end{smallmatrix}}{\mathop{C}}\,-H$

• question_answer86) Phenol is less acidic than

A) acetylene

B) para methoxy phenol

C) ethanol

D) para nitro phenol

• question_answer87) In a${{H}_{2}}{{O}_{2}}$fuel cell, 67.2 litre of${{H}_{2}}$at STP react in 10 minutes as per following reaction- Anode ${{H}_{2}}+2O{{H}^{-}}\to 2{{H}_{2}}O+2{{e}^{-}}$ Cathode ${{O}_{2}}+2{{H}_{2}}O+2{{e}^{-}}\to 4O{{H}^{-}}$ The average current produced by the fuel cell will be

A) 5 milliampere

B) 10 milliampere

C) 482.7 ampere

D) 965.4 ampere

• question_answer88) The element of atomic number 11 is highly reactive, which of the following elements will be most likely to be reactive metal?

A) Elementwithat.no. 17

B) Element with at. no. 24

C) Element with at. no. 37

D) Element with at. no. 54

• question_answer89) What type of hybridization is involved in ${{[Fe{{(CN)}_{6}}]}^{3-}}$

A) ${{d}^{2}}s{{p}^{3}}$

B) $ds{{p}^{2}}$

C) $s{{p}^{3}}{{d}^{3}}$

D) $ds{{p}^{3}}$

• question_answer90) Molar conductivity of a solution of an electrolyte$A{{B}_{2}}$is$160\text{ }oh{{m}^{-1}}c{{m}^{2}}mo{{l}^{-1}}$. If it ionizes as$A{{B}_{2}}\to {{A}^{+2}}+2{{B}^{-1}}$. Its equivalent conductivity will be

A) $150\text{ }oh{{m}^{-1}}c{{m}^{-1}}mo{{l}^{-1}}$

B) $\text{75 }oh{{m}^{-1}}c{{m}^{-1}}mo{{l}^{-1}}$

C) $\text{80 }oh{{m}^{-1}}c{{m}^{-1}}mo{{l}^{-1}}$

D) all of the above

• question_answer91) In${{S}_{N}}2$reactions the sequence of bond breaking and bond formation is as follows

A) bond breaking is followed by formation

B) bond formation is followed by breaking

C) bond breaking and formation are simultaneous

D) bond breaking and formation take place randomly

• question_answer92) Which of the following on nuclear bromination can yield only one monobromo derivative?

A) ortho xylene

B) meta xylene

C) para xylene

D) toluene

• question_answer93) Which of the following shows highest magnetic moment?

A) ${{V}^{3+}}$

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

C) $M{{n}^{2+}}$

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

• question_answer94) Which of the following can exhibit keto-enol tautomerism?

A) $C{{H}_{3}}-\overset{\begin{smallmatrix} O \\ || \end{smallmatrix}}{\mathop{C}}\,-H$

B) $CC{{l}_{3}}-\underset{\begin{smallmatrix} || \\ O \end{smallmatrix}}{\mathop{C}}\,-H$

C) $H-\underset{\begin{smallmatrix} || \\ O \end{smallmatrix}}{\mathop{C}}\,-H$

D) ${{(C{{H}_{3}})}_{3}}C-\underset{\begin{smallmatrix} || \\ O \end{smallmatrix}}{\mathop{C}}\,-H$

• question_answer95) CP-LCN is known as acetonitrile because

A) it contains an aceto group

B) on hydrolysis it gives acetic acid

C) acetic acid is converted to it by direct reaction with HCN

D) acetyl chloride on reaction with HCN gives the compound

• question_answer96) In the following four compounds, the one which is a functional isomer of the set of other three is

A)

B)

C)

D)

• question_answer97) Diethyl ether is isomeric with

A) primary alcohol

B) secondary alcohol

C) tert. alcohol

D) all of these

• question_answer98) The same quantity of electricity was passed through salt solutions of silver (at. wt. = 107.9) and gold (at. wt. = 197). If 1.439 g of Ag and 0.876 g of Au were deposited, the oxidation state of Au in the salt is

A) zero

B) +2

C) +3

D) +1

• question_answer99) ${{H}_{2}}S$acts only as a reducing agent while$S{{O}_{2}},$can act both as a reducing and oxidizing agent because

A) S in${{H}_{2}}S$has -2 oxidation state

B) S in$S{{O}_{2}}$has oxidation state$+4$

C) hydrogen in${{H}_{2}}S$is more +ve than oxygen in$S{{O}_{2}}$

D) oxygen is more -ve in$S{{O}_{2}}$

• question_answer100) In the equilibrium ${{A}^{-}}+{{H}_{2}}O\rightleftharpoons HA+O{{H}^{-}}$ $({{K}_{a}}=1.0\times {{10}^{-5}})$ The degree of hydrolysis of 0.001 M solution of the salt is

A) ${{10}^{-3}}$

B) ${{10}^{-4}}$

C) ${{10}^{-5}}$

D) ${{10}^{-6}}$

• question_answer101) A situation where one population is benefitted while the other unaffected is referred as

A) commensalism

B) parasitism

C) amensalism

D) symphily.

• question_answer102) Which of the following is incorrect?

A) iodine is needed for thyroxine formation

B) calcium regulates the excitibility of nerve fibres ag

C) potassium plays an important role in the regulation of acid-base balance in cell

D) phosphorous helps to maintain the osmotic pressure of the body fluids.

• question_answer103) The first antibody which gets formed in response to an antigen is

A) $IgM$

B) $IgG$

C) $IgA$

D) none of these.

• question_answer104) Megakaryocytes are the

A) cells found between the spaces in the lamellae of compact bone tissues

B) cells of bone marrow which give rise to thrombocytes

C) phagocytes found in the lymph

D) another name for thrombocytes.

• question_answer105) The hepatic cells which act as phagocytes are

A) Hansens cells

B) acinar cells

C) Kupffer cells

D) none of these.

• question_answer106) Which of the following is incorrect sequence in classification?

A) amphibia-anura-frog

B) reptilia-squamata-ophidia-shake

C) aves-neognathae-passeriformes-sparrow

D) mammalia-eutheria-artiodactyla-horse.

• question_answer107) Sea lilies are

A) echinoderms

B) coelenterates

C) rotifers

D) aquatic plants.

• question_answer108) Enterogastrone secretion is induced by

A) bile

B) fatty acids.

C) $HCl$

D) pancreatic juice

• question_answer109) Binding of ATP to myosin required the cofactor

A) Mg

B) Na

C) K

D) Ca.

• question_answer110) Cumulus cells are generally found around

A) corpus luteum

B) ovulated eggs

C) ovary

D) uterus.

• question_answer111) Which of the following chambers of ruminant stomach contains the gastric juice?

A) abomasum

B) omasum

C) rumen

D) reticulum.

• question_answer112) The embryonic skeleton is formed by

A) white fibrous cartilage

B) elastic cartilage

C) hyaline cartilage

D) none of the above.

• question_answer113) Reticular tissue forms the supporting frame work of

A) bone marrow

B) lymph gland

C) spleen

D) all of these.

• question_answer114) Which of the following organisms causes the sexual disease syphilis?

A) Neisseria gonorrhoae

B) Treponema pallidum

C) Pasteurella pestis

D) Clostrldium botulinum.

• question_answer115) The process by which new alleles of a gene are produced is termed as

A) point mutation

B) gene manipulation

C) para mutation

D) forward mutation.

• question_answer116) Deposition of uric acid crystals within the synovial joint causes as

A) osteoarthritis

B) rheumatoid arthritis

C) gout

D) paralysis.

• question_answer117) Aromatic amines used in the manufacture of synthetic dyes cause cancer of the

A) skin

B) lung

C) liver

• question_answer118) Allergic reaction can be controlled by

A) antibiotics

B) histamines

C) antihistamines

D) none of the above.

• question_answer119) Hepatitis B is transmitted through

A) blood transfusion

B) intimate physical contact

C) sexually

D) all of the above.

• question_answer120) The hereditary disease in which the urine of a person turns black on exposure to air due to the presence of homogentisic acid is known as

A) ketonuria

B) phenylketonuria

C) haematuria

D) alkaptonuria.

• question_answer121) Centre for thermoregulation is located in

A) anterior pituitary

B) hypothalamus

C) kidney

D) heart.

• question_answer122) In prokaryotes, DNA replication occurs

A) at the time of cytokinesis

B) soon after cytokinesis

C) well before cytokinesis

D) long after cytokinesis.

• question_answer123) Which of the following is the abundant protein in human body?

A) haemoglobin

B) myoglobin

C) $\alpha -$keratin

D) collagen.

• question_answer124) In zoological nomenclature the sub-species is represented by

A) trinomen

B) binomen

C) uninomen

D) none of these.

• question_answer125) Miller and Ureys experiment in its created atmosphere employed

A) oxygen, ammonia, methane and water

B) hydrogen, ammonia, methane and water

C) hydrogen, ammonia, ethane and water

D) hydrogen, oxygen, nitrogen and water.

• question_answer126) Most fossils have been found in

A) black soil

B) lava flows

C) granite

D) sedimentary rocks.

• question_answer127) The Nobel Prize for medicine in 1998 was won by

B) Jon Watson

C) V.M. Ingram

D) Southerland.

• question_answer128) Coelomoducts are the excretory organs in

A) earthworm

B) Hydra

C) Planaria

D) none of these.

• question_answer129) Athletes generally suffer from

A) tachycardia

C) dyspnoea

D) cardiac arrythmias.

• question_answer130) Which of the following vitamins serves as a coenzyme in transamination and decarboxylation of amino acid?

A) pantothenic acid

B) folic acid

C) pyridoxine

D) niacin.

• question_answer131) Cholecystectomy (removal of gall bladder) results in

A) gastric cramps

B) impaired fat digestion

C) perpetual indigestion

D) no appreciable change.

• question_answer132) The protein most extensively studied in age-related changes is

A) myosin

B) actin

C) collagen

D) tubulin.

• question_answer133) In saltatory conduction of impulse

A) time is conserved

B) energy is conserved

C) both time and energy are conserved

D) neither time nor energy is conserved.

• question_answer134) Podocytes are associated with

A) muscle fibres

B) auditory canal

C) neuron

D) nephron.

• question_answer135) Excretion of potassium is governed primarily by

A) potassium reabsorption in proximal convoluted tubule

B) potassium secretion in proximal convoluted tubule

C) potassium secretion in distal convoluted tubule

D) potassium reabsorption in distal convoluted tubule.

• question_answer136) Ribosomes are made up of

A) $tRNA$ and protein

B) $rRNA$and protein

C) $mRNA$and protein

D) $mRNA$ and DNA.

• question_answer137) Duchenne muscular dystrophy, a sex-linked inheritance, is characterized by

A) sex ratio disorder

B) wasting away of muscles

C) inevitable death

D) all of the above.

• question_answer138) In transcription, anticodon is seen in

A) $tRNA$

B) $rRNA$

C) $mRNA$

D) DNA.

• question_answer139) In ECG, P-R interval corresponds to

A) time delay in$A-V$node

B) $S-A$nodal conduction time

C) increased ventricular contraction

D) time interval between onset of ventricular contraction.

• question_answer140) During oogenesis the second meiotic division occurs

A) before ovulation

B) after fertilization

C) just before fertilization

D) immediately after fertilization.

• question_answer141) Human eye is sensitive to wavelength in the range of

A) 300-390 nanometer

B) 380-760 nanometer a

C) 790-800 nanometer

D) 300-360 nanometer.

• question_answer142) Which of the hormones is a polypeptide

A) LH

B) FSH

C) insulin

D) thyroxine.

• question_answer143) Thyroid hormone has regulatory effect on

A) protein metabolism

B) carbohydrate metabolism

C) fat metabolism

D) all of the above.

• question_answer144) Which of the following is glycoprotein?

A) haemoglobin

B) casein

C) egg albumin

D) gelatin

• question_answer145) A complete catalytically active enzyme together with its coenzyme is termed as

A) apoenzyme

B) holoenzyme

C) isozyme

D) lysozyme.

• question_answer146) Excessive nutrient load in a water body leads to its

A) nitrification

B) eutrophication

C) glaciation

D) purification.

• question_answer147) The stable community structure of an ecosystem is termed as

A) dominant community

B) biocommunity

C) domicile factor

D) climax community.

• question_answer148) The Periyar sanctuary is famous for

A) elephants

B) wild bears

C) swamp deers

D) antelopes.

• question_answer149) The movement of oxygen from alveoli into the blood in pulmonary capillaries is through

A) active transport

B) facilitated transport

C) passive transport

D) none of these.

• question_answer150) Which of the following are osmoconformers?

A) bony fishes

B) elasmobranche

C) hagflshes

D) Lampreys.

• question_answer151) Specific proteins responsible for the flow of materials and information into the cell are called

A) membrane receptors

B) carrier proteins

C) integral proteins

D) none of these.

• question_answer152) Proteins that are embedded in the liqid layer of biomembranes are called

A) intrinsic

B) extrinsic

C) peripheral

D) none of these

• question_answer153) The fluid-mosaic model of biomembrane was proposed by

A) Waston and Crick

B) Singer and Nicholson

C) Danielli and Davson

D) none of the above

• question_answer154) The thickness of cell membranes varies between 6-9

A) millimeters

B) micrometers

C) nanometers

D) picometers

• question_answer155) The percentage of proteins in the mitochondrial membrane is

A) 20

B) 50

C) 80

D) 100.

• question_answer156) The$N{{a}^{+}}/{{K}^{+}}$pump transports

A) $3N{{a}^{+}}$into and$2{{K}^{+}}$out of cell

B) $2N{{a}^{+}}$into and$2{{K}^{+}}$out of cell

C) $3N{{a}^{+}}$out of and$3{{K}^{+}}$into cell

D) $3N{{a}^{+}}$ out and$2{{K}^{+}}$into cell.

• question_answer157) The bounding layer of protoplasm is called

A) ectoplasm

B) ectoderm

C) endoplasm

D) none of these.

• question_answer158) The maintenance of a steady and stable internal environment in an organism is called

A) equilibrium

C) homeostasis

D) all of these.

• question_answer159) One of the sciences for which training in biology is essential namely the science of treating diseases with drugs or curative substances, is called

A) pest control

B) physiotherapy

C) medicine

D) pharmacy.

• question_answer160) Roughly speaking, the ratio of present day species of plants to animals is

A) $\begin{matrix} 1.0 & 0.04 \\ \end{matrix}$

B) $\begin{matrix} 1.0 & 0.4 \\ \end{matrix}$

C) $\begin{matrix} 1.0 & 1.4 \\ \end{matrix}$

D) $\begin{matrix} 1.0 & 2.4 \\ \end{matrix}$

• question_answer161) As they release hydrolases that digest old and damaged cells, the term suicide bags is aptly used by cell biologists for

A) golgi bodies

B) lysosomes

C) glyoxisomes

D) peroxisomes.

• question_answer162) The conspicuous protein-storing layer of endosperm in cereal grains Contains

A) ribosomes

B) microbodies

C) aleurone grains

D) starch grains.

• question_answer163) Thread like protoplasmic projections on the free surface of absorptive cells (such as intestinal cells) are called

A) plasmodesmata

B) microfilaments

C) cilia

D) none of these.

• question_answer164) The space separating the two membranes around the nucleus is called

A) endonuclear space

B) exonuclear space

C) matric space

D) perinuclear space.

• question_answer165) The total number of cells in the human body is at least

A) ${{10}^{3}}$

B) ${{10}^{6}}$

C) ${{10}^{9}}$

D) none of these.

• question_answer166) The catalase-containing vesicles present in liver and leaf cells are called

A) glyoxisomes

B) lysosomes

C) peroxisomes

D) polyribosomes.

• question_answer167) Dictyosomes were discovered in 1989 by

A) Robert Brown

B) Rudolf Virchow

C) Robert Hooke

D) none of these.

• question_answer168) The two cell organelles not enclosed by a membrane are

A) chloroplast and mitochondrion

B) nucleus and nucleolus

C) golgi apparatus and microbodies

D) none of the above.

• question_answer169) The primary cells wall of plant consist of

A) cellulose

B) hemicellulose

C) pectin

D) all of these.

• question_answer170) The layer of cell wall common to two adjacent cell wall in plants is called

A) middle lamella

B) middle layer

C) common lamella

D) common layer.

• question_answer171) The symbiotic association of an algae and a fungus is called

A) mycorrhiza

B) fairy ring

C) lichen

D) none of these.

• question_answer172) Early and late blight of potato are caused respectively by

A) Fusarium and Claviceps

B) Gibberella and Penicillium

C) Aspergillus and Ustilago

D) none of the above.

• question_answer173) Fairy Rings in lawns result from outward- spreading circles of mycelia of mushrooms producing, at their periphery, fruiting bodies called

A) ascocarps

B) basidiocarps

C) sorocarps

D) pseudocarps.

• question_answer174) The phenomenon of sexual reproduction in zygomycetes, dependent upon the successful mating between$+$and$-$strains, is called

A) heterothallism

B) heterosis

C) heterospory

D) heterogamy.

• question_answer175) The number of known species of fungi is about

A) 1,000

B) 10,000

C) 1,00,000

D) 10,00,000.

• question_answer176) The rumen of cattle is the site of fermentation of cellulose fibres through the action of

A) archaebacteria

B) cyanobacteria

C) mycoplasmas

D) spirochaetes.

• question_answer177) An antibiotic not produced by one of the monera (Streptomyces) is

A) erythromycin

B) penicillin

C) streptomycin

D) tetracycline

• question_answer178) Gram negative heterotrophic bacteria that can biodegrade a variety of natural as well as man- made organic compounds, such as petroleum products, include

A) cyanobacteria

B) Clostridia

C) archaebacteria

D) none of these.

• question_answer179) Mycoplasmas are also called PPLO, which is an abbreviation of

A) pentose phosphate-led oxidation

B) parasitic prokaryote-like organisms

C) pleuropneumonia and plant-like organisms

D) pleuropneumonia-like organisms

• question_answer180) The most numerous and ancient, smallest and simplest microscopic organisms belong to which of the following kingdom?

A) bacteria

B) fungi

C) monera

D) plantae.

• question_answer181) Dodder (Cuscutta sp.) is an exceptional dicotyledon as it

A) is a parasite

B) is without leaves

C) lacks cotyledons

D) does not produce flowers.

• question_answer182) Chilghoza, a gymnosperm seed, that is eaten as a dry fruit is produced by

A) Pinus roxburgii

B) Pinus gerardiana

C) Ginkgo biloba

D) Cedrus deofara.

• question_answer183) The seed coat in both gymnosperms and angiosperms is derived from the

A) megaspore

B) microspore

C) megasporangium

D) microsporangium.

• question_answer184) Conifers have a definite advantage over other plants of the colder regions, due to their sustained photosynthetic activity, being

A) perennial

B) tall

C) evergreen

D) xerophytic.

A) Chlamydomonos

B) Spirogyra

C) Ulothrix

D) Volvox.

• question_answer186) The present day higher green plants are believed to have evolved from

A) ferns

B) green algae

C) liverworts

D) mosses.

• question_answer187) A few exceptional algae are parasitic. They include

A) Cephaleuros and Harveyella

B) Sargassum and Spirogyra

C) Ulothrix and Volvox

D) Chlamydomonas and Gelidinm.

• question_answer188) The commercially exploited algae include

A) Caulerpa, Chara and Volvox

B) Gelidium, Laminaria and Porphyra

C) Acetabularia, Spirogyra and Ulothrix

D) all of the above.

• question_answer189) The red colour of rhodophyta is due to the preponderance of

A) phycobilins

B) phycocyanin

C) phycoerythrin

D) none of these.

• question_answer190) Kingdom plantae comprises multicellular photoautotrophs that are

A) aquatic

B) epiphytic

C) terrestrial

D) all of these.

• question_answer191) The Chipko Movement for conservation of forests was started in 1972 in

A) North Kanara distric

B) Silent Valley

C) Sunderbans

D) Tehri-Garhwal.

• question_answer192) The government-sponsored programme for growing trees in towns and cities for aesthetic value is called

A) floriculture

B) agroforestry

C) social forestry

D) urban forestry.

• question_answer193) MAB of UNESCO stands for

A) man and biodiversity

B) maintenance of acquired biodiversity

C) movement for auxiliary biosphere

D) none of the above.

• question_answer194) The rate of formation of organic molecules in green plants or their populations is called

A) photosynthetic rate

B) net assimilation rate

C) gross primary productivity

D) net primary productivity.

• question_answer195) The natural cycles of carbon, oxygen, nitrogen, water, phosphorous, sulphur etc. are collectively called as

A) biochemical cycles

B) geochemical cycles

C) material cycles

D) none of the above.

• question_answer196) Recycling of matter occurs between the biotic and abiotic components of the biosphere during the formers

A) life

B) death

C) both [a] and [b]

D) neither [a] nor [b].

• question_answer197) With regard to materials, the earth and its atmosphere are a closed system. However, a little inflow of material does occur from outer space in the form of

A) UFOs

B) cosmic rays

C) meteros

D) all of these.

• question_answer198) Biosphere may be defined as

A) earths hydrosphere, lithosphere and atmosphere

B) a combination of all ecosystems of the earths environment

C) the entire inhabited part of the earth and its atmosphere, including living and non-living matter

D) all of the above

• question_answer199) Of the known flowering plants, the number of species of monocots is a partly

A) 5000

B) 50,000

C) 5,00,000

D) 555,00,000.

• question_answer200) The gymnosperms formed the dominant vegetation on the earth during the geological period called

A) carboniferous

B) permian

C) triassic

D) Jurassic.