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PHYSICS m2

Q.1 A jet of water whose cross- section is a, strikes a wall making an angle with normal and elasticallyrebounds. The velocity of water of density d is v. force exerted on the wall is-

a! " av"d cos b! av"d cos c! "avd cos d! avd cosQ." A force exerts as im#ulses j on a body which is changing it s#eed from u to $. The force and themotion of the body are along the same line. The work done by the force is-

a! %v"-u"!&" b! %v'u!&" c! %v-u!&" d! %v"'u"!&"

Q.( A bullet is fired from a gun. The force on the bullet is given by- )*+-"x1 there ) is in newton and t in second. The force on the bullet becomes ero as soon as it leaves thebarrel. The average im#ulse im#arted to the bullet in /ew - ton- second is- a! 1.0 b! ero c! d! .Q.2 3ix identical steel balls are lined u# in a straight frictionless groove made on a horiontal surface.Two similar balls moving with s#eed $ collide elastically with the row of six balls from the lift. Then

a! one ball from the row moves with a s#eed "$ other balls remaining at rest.b! Two balls from the row moves with a s#eed $ each other balls remaining at rest.c! all the six balls in the row will move with a s#eed $&+ each and the two incident ball will come

to rest. d! all the 0 balls move with a s#eed $&0 each.Q.4 A force of 2x'(x! newton acts on a #artical which dis#laces it from x* "m to x*(m. The workdone by the force will be- a! (".0 joule b! (."0 joule c! .("0 joule d! ero

Q.+ A ball is dro##ed from a height on a stationary floor and rebounds several times until is sto#s. 5fthe coefficent of restitution is e, then total distance covered by the ball the before it sto#s, would be-

a! e"h b! 1'e&1-e h c! 61'e" 7& 61-e"h7 d! 1'e!"hQ.8 A truck and a car having same kinetic energy are sto##ed by a##lying e9ual retarding

forces. Then - a! both will sto# at the same distance. b! truck will sto# at greater distance c! car will sto# at lesser distance

d! car will sto# a greater distance and truck will sto# at lesser distanceQ.0 A moving ball of mass m suffers a #erfectly elastic collision not head on! with a e9ually

massive ball initially at rest. After collision, the two balls fly of at an angle between them,then is , :efore ;ollision a! b! &2 c! &" d!

Q. A #artical of mass m is made to move with uniform s#eed $ along the #erimeter of a regular#olygon of n sides, inscribed in a circle of radius a. The magnitude of im#ulse a##lied at each corner ofthe #olygon is < a! "m$ sin &n b! m$ sin =&n c! m$ sin n& d! "m$sin n&Q.1 A ball of mass m moving with a s#eed u undergoes a head on elastic collision with a ball of massnm initially at rest. The fraction of the incident energy transferred to the heavier ball is -

a! n&n'1 b! n&n'1!" c! "n &n'1! d! 2n & n'1!"

Q.11 A chain is #laced on a frictionless table such that its 1&4#art is hanging down over the edge of thetable. if the lenght of the chain be l and the mass be m, then how much work will be done in #ulling u#hanging #art of the chain- a! mgl&4 b! mgl & "4 c! mgl&"4 c! mgl & 8.4Q.1" A neutron traveling with a velocity v and >.? @? collides #erfectly elastically head on with thenucleus of an atom of mass number A at rest . The fraction of total energy retained by neutron is-

a! 6A-1& A'17 "b! 6A'1& A-17 " c! 6A-1& A7" d! 6A'1& A7 "Q.1( The #otential energy between two atoms in a molecule is given by Bx!*a&x-b& x,where a and b

are #ositibve constants and x is the distance between the atoms. The atom is in stable e9uilibrium whena! x * +C11a & 4b b! x * +Ca & "b c! x* d! x * +C"a & b

Q.12 A rifle bullet loses 1&" of its velocity in #assing through a #lank. The least number of such#lanks re9uiied just to sto# the bullet is - a! 4 b! 1 c!11 d! "

Q.14 A cord is used to lower vertically a block of mass D by a distance d with constant downward acceleration g&2 work done by the cord block is . The s#ring is cut intwo #ieces of unstressed lengths l1* nl"being an interger. hat are the corres#onding

force constant >1and >"in terms of n and > P

a! > n'1&n!, >n'1! b! >n&n'1!, > n c! >n, >n'1! d! ln'1!, > n!Q.22 A sim#le #endlum set u# to swing in front of a second #endulum of a clock is seen to gain

so that the two swing in #hase at intervals of "1 seconds. The time of vibration of thesim#le #endulum isa! 1.4 3econds b! 1.0( 3econds c! 1.18 3econdsd! ?ither1.0( 3econds or 1.18 seconds

Q.24 Two linear sim#le harmonic motions of e9ual am#litude and fre9uencies and " are im#ressed on a #article along the axes of x and y res#ectively. 5f the inital #hase difference between them is &", find the resultant #ath followed by #articles.

a! y"* x" 61-x" & A"7 b! y"* "x" 61-x" & A"7

c! y"* x" 61'x" & A"7 d! y"* 2x" 61-x" & A"7Q.2+ A body of mass D and charge 9 is sus#ended from a s#ring when sightly dis#laced, it

oscillates with #eriod T. 5f a uniform electric fields acts vertically downwards then the newtime #eriod will be -a! T L T b! T M T c! T * T d! /othing can be said

Q.28 A body of mass D is situadted in a #oetntial field Bx! * BN1 - cos x!, where BN and

are constants. The time #eriod of small oscillations will be

a! " D& "B!1&"b! "BN & D"!1&" c! "DBN

"! d! "BN"&D!1&"

Q.20 5n the adjoining figure the velocity i! and acceleration ii! of a #article executing 3ODare shown. The time #eriod of the #article is -

a! 1"4& b! & 1"4 c! ".4 d! 1 & 1."4Q.2 A uniform rod of length l1#ivoted at N is de#icted in the following figure. The moment of

interia of the rod about the axis #er#endicular to the rod and #assing through #oint N is 5,A mass m sus#ended from one end of the s#ring is connected with one end or rod as theshown figure. The s#ring constant of the s#ring is >. Eod in balanced #osition is horiontal. 5f rod is set in to small oscillations, then its fre9uency

a! 1&" 25 ' ml" & kl"!1&" b! 1&" kl" & 25 ' ml"!1&"

c! 1&"25 ' ml& kl"!1&" d! 1&"kl" & 5 ' ml" !1&"Q.4 5n arrangement given in figure, if the block o#f mass m is dis#laced, the fre9uency is

given by < a! n * R >1- >"& m!

1&" b! n * 1&">1' >"& m!1&"

c! n * 1&"m & >1' >"!1&" d! n * 1&"m & >1- >"!1&"Q.41 A uniform ro#e of length l lies on a table . 5f the coefficient of friction is , then the

maximum length l1of the #art of this ro#e which can overhang from the edge of the

table without sliding down is -a! l & '1 b! l & -1 c! l & '1 d! '1& l

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Q.4" Fulling force making an angle to the horiontal is a##lied on a block of weight #laced on a horiontal table. 5f the angle of friction is , the magnitude of force re9uired tomove the body is e9ual to -a! sin& ;os S- ! b! cos & cos S- c! tan & sin S- ! d! sin & tan - !

Q.4( Two blocks A and : each of mass m are connected by a massless s#ring of natural lengthG and s#ring constant >. The blocks are initally resting on a smooth horiontal floor withthe s#ring at its natural length, as shown figure. A third indentical block ;, also of mass m,moves on the floor with a s#eed v along the line joining A and :, and collides with A. Then

a! The kinetic energy of the A-: system, at maximumcom#ression of the s#ring, is mv" & 2b! The maximum com#ression of the string is vm & "k!1&" c! both A U : d! /either A nor :

Q.42 A car running at "4km&h can be brought to rest by a##lying brakes in a distance of .4 m.if a car is running at at 84km&h , how far will it go before it coming to rest , if the brakingforce remaining the sameP

a! 1 m b! " m c! (m d! 2.4 mQ.44 A car accelerates from rest to a s#eed of 1 m&s. Get energy s#ent be ?. if we accelerate the carfrom 1 m&s , the energy s#ent will be-

a! ? b! " ? c! ( ? d! 2 ?

Q.4+ A vehicle is moving on a horiontal road at a constant s#eed of 1 m&s. The engine needsto s#end 4 kj energy #er second. what is the force of the #er vehicle.a! 4 k / b! 4 k / c! .4 k / d! .4 k /

Q.48 A s#ring is held com#ressed. its stored eergy is ".2 joule. its ends are in contact with massesof 1 gm and 20 gm #laced on a smooth horiontal surface. when the s#ring is released , themass of 20 gm will ac9uire a velocity of-

a! ".2&12 m&s b! "2 x 2 & 20 m&s c! 1 & 8 m&s d! 12&8 m&sQ.40. A moving mass of 0 kg collides elastically with a stationary mass of " kg. if >.? will of the

moving mass , the kinetic energy left with it after the collision will be-a! .0 ? b! .+2 ? c! .(+ ? d! .0 ?

Q.4 A ball collides elastically with another ball of the same mass. The collision is obli9ue andintially one of the ball was at rest. After the collision , the two balls move with same s#eed.

what will be the angle between the velocity of the balls after the collision Pa! ( b! 24 c!+ d!

Q.+ A ball im#ings directly on a similar ball at rest. The first ball is brought to rest by theim#act. if half the kinetic energy is lost by im#act, what is the value of the coefficient ofrestitutionP a!1 & "" b!1 & ( c! 1 & " d! ( & "

Q.+1 Two e9ual billiard balls are in contact on a table. A third e9ual ball strikes them symmetrically and remains at rest after im#act. The coefficient of restitution is -a! " & ( b! 1 & ( c! 1 & + d! ( & "

Q.+" A mass of .1 kg attached to a string 1 m long is rotated in such a way that it just describes a vertical circle of radius 1 m. which statement& statements, is &are correct-a the tension has the lowest value of 1.+ units.b! there are at least two #oints in the #ath where the angular momentum is .42"" unitc! both A and : d! neither A nor :

Q.+( A motor drives a body along a straight line with a constant force. The #ower F develo#ed by the motor much very with time as-a! b!

c! d!

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Q.+2 The ratio of the radii of the #lanets F1and F" is k1. The ratio of the acceleration due to the

gravity on then is >".The ratio of the esca#e velocities from them will be-

a! k1 k" b! k1 k" !1&" c! k1&k"!

1&" d! k"&k1!1&"

Q.+4 A satellite is orbiting around the earth with a #eriod T. if the earth suddently shrinks to halfits radius without change in mass, the #eriod of revolutoon of the satellite will be-

a! T & " b! T & " c! T d! TQ.++ A stellite is revolving around the earth in a circular orbit 2 times the radius of the #arking

orbit. what will be the time #eriod of the satellite Pa! " days b! 2 days c! 1"+ days d! /one of the above

Q.+8 A #lanet is revolving around the sun in elli#tical orbit. its closest orbits from the sun is rand the farthest distance is E. if the orbital velocity of the #lanet of the #lanet closest tothe sun be v,then when is the velocity at the farthest #ointP

a! v r & E b! v E & r c! v r & E!1&" d! v E&r!1&"

Q.+0 Two satellites 31and 3"revolve round the #lanet in co#lanar circular orbit in the same

sense and their #eriods of revolution are one hour and eight hours.The radius of orbit of 31

is 1 km. what will be the angular s#eed of 3"as observed from 31when they are closest to

each other -a! &( radian & hr b! "&( radian & hrc! radian & hr d! "radian & hr

Q.+ The orbital #eriod of a statellite in a circular orbit of radius r about s#herical #lanet ofmass D and mean density # for a low altitude orbit will be-a! 6(& K#71&" b! 6(K#71&" c! 6& K#71&" d! 6" K#71&"

Q.8 A loo# and disc have the same mass and roll without sli##ing with the same linear velocityv. if the total kinetic energy of the loo# is 0 , the kinetic energy of the disc must be -a! + j b! 0 j c! 1j d! 1" %

Q.81 A right horiontal smooth rod A: of mass .84 kg and length 2 cm can rotate freely abouta fixed vertical axis through its mid #oint N. Two rings of mass 1 kg initially at rest at a dis

tance of 1 cm from N on either side of the rod. the rod is sent in rotation with an angularvelocity of ( radins #er sec. when the rings reach the ends of the rod, then angular velocity in rad& sec is-a! 1 b! 14 c! " d! "4

Q.8" A wheel and an axle, having a total moment of inertia ." kg m", is caused to rotateabout a horiontal axis by means of an 0 g mass attached to a called assumed massless!that is wound around the axle. The radius of the axle is " cm. starting from rest , how farmust the mass fall in order to give the wheel a s#eed of ( rev.&sPa! "."4 cm b! (."4 cm c! 2.4 cm d! 4."4 cm

Q.8( hen 1 j of work is done u#on a flywheel its a angular s#eed increases from + rev&minto 10 rev.&min. The moment of inertia of the flywheel is -

a! ."1 kg-m" b! .+( kg-m"s c! .02 kg-m" d! 1.4 kg-m"

Q.82 5f a sim#le harmonic oscillator has got dis#lacement of ." m and accleration e9ual to ".m&s" at any time , then angular fre9uency of the oscillator is e9ual to -a! 1 rad&sec. b! .1 rad&sec. c! 1 rad&sec. d! 1rad&sec.s

Q.84 A sim#le harmonic oscillator has an am#litude a and time #eriod T. The time re9uired by itto travel from x * a to x * a&" is.a! T&+ b! T&2 c! T&( d! T&"

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CHEMISTRY

Q.76 "# the intial concentration of a reactant A is 9uadru#les and the rate of the reaction is doubled, theorder of reaction w.r.t. A is A! first :! one-half ;! ero V! secondQ.77 The rate constant of a reaction is 1."x1$%mol-"G"s-1.The order of reaction isa! b! 1 c! " V! (Q.80 The rate constant of a reaction has the units as that of rate of reaction. The reaction order isa! b! 1 c!" V! (Q8 5n the first order reaction, 84W of the reaction disa##eared in ".(( h. ;alculate rate constant of thereactionA! .+" h-1 c! .+" h-1 b! +." h-1 d! .(1 h-1

Q0 5f initial concentration is doubled, the half-life #eriod of reaction is also doubled. The order ofreaction is A! ero :! third ;! second V! firstQ01 5dentify the state function among the followingA! 9 :! 9 - w ;! 9&w V! 9 ' wQ0" hich one of the following conditions corres#onds to a transformation that cannot take #lace at all PA! O-ve and3o've :! O-ve and So-ve ;! Oo've and 3o-ve V! O've and3o'veQ0( 5n an endothermic reaction, the energy of the #roducts(A) is less than that of the reactants :! is greater than that of the reactants;! is same as that of the reactants V! is eroQ02OessXs law of heat summation includesA! initial reactants only :! initial reactants and final #roducts ;! final #roductsV! intermediates onlyQ04 )or the reaction ;s! ' Y" g! Z ;N" g![ l. rxn * - (( k%Oow many grams of ; s! must be burned to release "84 k% of heatPA! "".( g ;! 1". :! .8 V! 0.2 Q0+ Oow much heat is absorbed from the surrounding, when 14g of N"react according to the e9uationP' N"N( Or\n * 1( k%A! 2.+ x 1-( k% :! 20 k% ;! + k% V! (" >j

Q.08 The N.3. of oxygen in Ft)+ is a! ero b! ' Rc!' 1 d! -1&"Q 00 The oxidation number of Je in JeN)"isA! :! " X ;! 2. d! (Q 0 The oxidation number of #hos#horus in ATF adenosine tri#hos#hate! isA! 2 :! ( ;! 4 V! ".Q The oxidation number of oxygen in #otassiumsu#eroxide >N"is A! < " :! - 1 ;! -1&" V! -1&2.

Q.1ln the reaction] 2)e ' (N"2)e('' +N"-hich of the following statement is correctPA! A redox reaction :! )e is reducing agent ;! )e('is an oxidiing agent V! )e is reduced to )e('

Q" The reaction] O"3 ' O""3 ' "O"N manifestsA! acidic nature of O"N":! alkaline nature of O"N" ;! Nxidiing action of O"N"V! Eeducing action of

O"N"Q( The unit of electrochemical e9uivalent is

A! g :! g A-1 ;! g ;-1 V! ; g-1

&94 hich one of the following molecules can not serve as a monomer for an addition #olymerP'A( C"C) * ;O" :! O";* ;O;/ V! ;O(;NO)'C( )C ** C)%;+O4Q 4 hat ty#e of #olymer is re#resented by the following segmentP +%COC)C)%CO%OC)C)O%

A! #olyamide :! #olyester ;! #olyolefin V! #olyethylene

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.Q + hich one of the following is a #oly-hydrocarbon PA!starch :! natural rubber ;! casein V! teryleneQ8 hich of the following, glycol is an im#ortant constituentPA! Vacron :! acrilan ;! teflon V! viscose rayon

Q0 hich of the following statement is incorrectPA! Folyth-ethylene contain double bonds :! the monomer used to make teflon is ;")2;! condensation #olymers are known as co#olymers V! a denatured #rotein could have the same

#rimary structure as the active #rotein

Q ?lectron affinity for a noble gas is a##roximately.e9ual to

A! that of halogens :! ero ;! that of oxygen family V! that of nitrogen family

Q 1 3ie of ionic s#ecies follows the order ]

A! 5L 5'L 5 :! 5-L 5 L 5' ;! 5'L5L5- V! 5'L5-L5

&1$1 )ind the e.m.f. of the following cell at "4Y;. A5&A5'( .1 D!&Al'(."D!&AlA! .8 volts :! 0.0059 volts ;! . volts V! . volts

Q1" hen 3N" gas is #assed through an acidified solution of >";r"N8

A! The solution becomes blue :! The solution becomes colourless

;! 3"is reduced V! Kreen ;r "32!(is formed.Q.103 The first order rate constant for the decom#osition of /Fs is +.J1-2sec-5.hat is the half life

#eriod for this decom#ositionP'A( 1118.8 sec ;! 1300sec :! 14$$sec V! 1500sec.Q12 A first order reaction takes +.( minutes for 4W com#letion. Oow much time will be needed for

0.W com#letionP 'A( 1+. min ;! (.min :! ". min V! 2. min

& 1$5 Nn adding ammonium hydroxide solution to a9ueous A5"32!(

A! A #reci#itate is formed which does not dissolve in .excess of ammonium hydroxide. . d! /one

:! A #reci#itate is formed which dissolves in excess of ammonia solution ;! /o #reci#itate is formed

Q1+ Dost ionic chloride is A! Fb;5" :! ;;52 ;! Fb;l2 V! 3i;52Q18?va#oration of water is]A! An exothermic change :!An endothermic change;! A #rocess where no heat change occur V! A #rocess accom#anied by chemical reaction.&1$85n which of the following neutraliation reaction, the heat of neutraliation will be highestPA! /O2NO and O"3N2 :! O;5 and /aNO ;! ;O(;NNO and >NO V! ;O(;NNO and /O2NO&1$9The rate constant of forward and backward reactions for certain hy#othetical reaction are 1.1x1 -"

and 1.4 x1-(

res#ectively. The e9uilibrium constant for the reaction is ]A! 8.(( ;! 8(..( :! ..8(( V!8((&+11$ hich of the following ex#ression is correct for first order reactions ;o refers to initialconcentration of reactant!A! t1;o ;! t1;-" :! t1&" ;o-5 V! t1&";oo

Q111 W of a first order reaction was com#leted in (" minute. hen will .W of the reactioncom#lete A! 4 min :! 2+ min ;! 2 min V! 20 miQ11" )or a hy#othetical reaction[ A-G, the rate ex#ression is]

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Eate * -d;A&dt

a! negative sign re#resents that rate is negative:! negative sign #ertains to the decrease in the concentrations of reactants.;! negative sign indicates the attractive forces between reactant.V! none of the above is correct.&113Among the following reactions, the fastest one is]A! burning of ;oal :! rusting of iron in moist air

;! conversion of monoclinic sul#hur to rhombic sul#hurV! Freci#itation of silver chloride by mixing silver nitrate and sodium chloride solutionsQ114Foint out the incorrect statementA! Eate law is an ex#erimental fact where as law of mass action is a theoretical #ro#osal.:! Eate law is always different from the ex#ression of law of mass action.!;! Eate law is more informative than law of mass action for the develo#ment of mechanismV! Nrder of reaction is e9ual to the sum of #owers of concentrations terms in the rate law.&115A hy#othetical reaction A"' :""A: follows the mechanism as given below]

A"LA ' A fast!A ' :"A: ' : 3low!A ' : A: fast!The order of over all reaction is]

A! " :! 1 ;!11&" V! Q11+ )or hy#othetical chemical reaction A 5, it is found that the reaction is third order in A. hat

ha##ens to the rate of reaction when the concentration of A is doubledA! rate increases by a fraction of ". :! rate decreases by a factor of (;! rate increases by a factor of 0.

V! rate remains unaffected.&117 hich of the following rate laws has the over all order of the reaction e9ual to .4A! r * k6x71&"[y]1/2[z]1/2

:! r * k6J7(&"6y7-167

;! r * [x] 6y76z]-1

V! r * k6x7 6y7 [z]&118A chemical reaction involves two reacting s#ecies. The rate of reaction is directly #ro#ortional to the

conc. of one of them and inversely #ro#ortional to the concentration of the other. The order of reaction is

A! 1 :!" ;! ero ! un#redictableQ11 The standard freeenergy change G$! is related to e9uilibrium constant >! as ]A! G$* %+3$3 ET ?n > :! G$* ,3$3 ET log > ;!G$* ET log > V! G$* %+3$3 ET log >&1$ 5n #resence of dil O"3N2the e9uivalent weight of >DnN2is]A! 1&4 of itsX molecular weight :! 1&+ of its molecular weight;! 1&1 of its molecular weight V! 1&" of its molecular weightQ1"1ith the hel# of following data, find out the change in heat content for the reaction]C)4 'g( ' O"g! K"Oeg! ;"O+:ond :ond energy >%!;-O 21(;-; (20;*; +1

O-O 2(+'A( -1"0 >% ;! ' "4+>% :! '1"0 >% V! -"4+ >%

Q1"" Vuring electrolysis of O"N, the molar ratio of O"andN"formed 5s ](a) " ] 1 :! 1 ] " ;!1]( V!1]1

Q1"( To #roduce 1+g of oxygen, the number of moles of water re9uired to be electrolysed is ]A! ".4 0! 4 ;!1 V!"

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Q1"2.Oow many coulomb of electricity are consumed when1 mA current is #assed thorugh a solutionof Ag/N( for ( minute during an electrolysis ex#eriment]

A! 10 :! 10, ;! 10 V! (Q1"41.0 g of metal were de#osited by a current of ( V am#ere for 4 minute. The e9uivalent wt. of metal

isA! ".4 0! "4.0 ;! 1.( V! (.8Q1"+ )ind out the concentration of Hn'" ion in the right half of the cell ]Hn ^ Hn'".1 D!^Hn'D *P!! ^Hn if its e.m.f. at $-C * $+$$! volts.A! .01" D :! .2"D ;! .0 D V! .8 DQ1"8 ."+2 gram of co##er was de#osited on #assage of a current of .4A for ( minutes throught a

solution of co##er sul#hate. ;alculate the atomic weight of co##er 1 )araday * +,4 coulombs!.A! 0."2 gram '.( 9$+14 gram ;! !3+5! gram '/( !9+14 gramQ1"0 The density of co##er is 8.94 g/ml. )ind out the number of coulombs needed to #late an area

1Ncmx1Ncm to a thickness o# 1$%c0. using ;u3N2solution as electrolyte 6;u * +(.4[ one faraday * +,4coulombs7

'A( 11.2(2 ;!"8,18" :! (4,+80 V! 2,18"&19 The weight ratio of A5 and Ag de#osited using the same 9uantity of current is ] X

A! ] 10 :! " ] 1" ;! 10 ] V! ( ] 0Q 129 ;is-1 ,2-#olybutadiene is ex#ected to be ]a! Thermo setting #lastic b! Thermo#lastic c! Eesin d! ?lastic rubber!Q130 :una-3 is a #olymer of ] a! :utadiene and styrene b! f(utadiene;! 3tyrened! :utadiene and chloro#rene&131 Oigh density #olyethylene OVF?! can be #re#ared)rom ethylene by ]A! Hiegler-/atta #rocess b! Oeating with #eroxides ;! ;ondensing in sealed tubesd! condensing with styrenesQ 1(" A radioactive element has a half-life of one day.After three days, the amount of the element left

will be A! 1&" of the original amount :! 1&2 of the original amount;! 1&0 of the original amount V! 1&1+ of the original amount

Q.1(( 5f 0. gm of aradioactive isoto#e has a half-lifeof1 h,the half-life of "." of the-same substance is A!".4h 0!4h ;!1h V!2h&134 84o

1$8b$!2 4)eIf the grop n0ber of 8b is 14, then grop n0ber

o# 84Po is 'A( 1 '.(1! 'C(4 '/( !&135 A#ter the e0ission of an a%particle #ro0 the ato0 9

38, the n0ber of netrons in the ato0 ill be

'A( 138 '.( 14$ 'C( 144 '/( 15

&13! "#rani0 '0ass n0bers 38 and ato0ic n0ber9( e0its an a%particle has 0ass n0ber and ato0ic

n0ber ( 3! and 9 'C( 38 and 9$ '.( 34 and 9$ '/( 3! and 9$

&137 6hich one of the #olloing 0olecles can not sere as a 0ono0er #or an addition poly0er

'A( C"C) * ;O" :! O";* ;O;/ V! ;O(;N%O)'C( )C ** C)%;+O4Q138 The half life #eriod of a radio-active nuclide is ( hours. 5n hours its activity will be reduced byA!1& :! 8&0 ;! 1&"8 V!1&X+Q139 The binding energy of an element is +2Dev. 5f :?&nucleon is +.2, the number of nucleons are]A!1 :!;2 ;!1+ V!+Q.12 3uccessive emission of al#ha-#article and two beta-#article by an atom of an element results in

the formation of A! 5sodia#her:! 5somor#h ;! 5soto#e V! 5sotherm.&141 Facking fraction is related to]A! Dass defect :! Atomic number ;! /uclear s#in V! /one&14 6hat is the true for the reaction] C"5 'g( C"3'g( ' ;l"g!A! H * ? :! O M ? ;! O L ? V! /one ofthese&+143 )ollowing adiabatic conditions, work done on the system is e9uivalent to 4ca_. hat are the

values of 9, , and ?P A! 9 * -4, ? * , * '4 :! 9 * , ? * '4 * -4;! 9 * a * ' 4 ? * -4 V! 9 * * ? * 4

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&+144 The gaseous endothermic reaction]1 2 & at "8Y; takes #lace s#ontaneously, becauseA! O L [ 3 L 0! ZO M ] Z3 M ;! ZO L [ Z3 M X! ZO M [ Z3 L a$+145 5ce and water are at e9uilibriulT% at "8(> because]A! O M T3 :! O * T3 ;! OL T 3 V! K is #ositiveQ.12+ )or the va#ourisation of water]

O"N(L) L*M O"Ng! 61 atm. #ressure7Kiven ,3] 1$ :;%1and ) ** 245+$;: ;al :! " > cal ;! ( > ;al V! 2 > ;al&+149 Turn :ulls blue is] A! )e( 6)e;/!+7":! >2)e;/+ ;! >()e;/!+ V! a!"e(#)$&+15$ >DnN2in acid medium is always reduced to]A! Dn2' 0! Dn"' ;!Dn+' V! Dn

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