Chemistry Stream

1. L
USN
(A) x srn x
8
Solve 4.,. u4+ t l9+6y = e* + l.
dx' dx' dx
Solve !4-ou: cos h (2x - l) + 3-.
dx'
1OMAT21
(r) *ttl"
(04 Marks)
Second Semester B.E. Degree Exanpriffi16pffie / July 2014
Engineering MathemBtlG5- ll , i,i
I Nbte'L. Answer FIYE futl questions choosing at least twofrom each part.
i '" ,P|;finswer all objective type questions only in OMR sheet page 5 of the Ae*€y Booklet.
E ,.*ii*"r" to obiective type fuestions on ih"a, other thun OMR wiT rcnibb"'iatued.
::j...
G;
o_'t,,:,. ,,,,Fime:3 hrs. Max. Marko:l@,O
e
E
E l$^**'f /---,.^- Dft/D C.,1, ^..--]i^-- ^L^^dien na lnnsi ttnn ltau onnb antl d
.E n
ER {
S= PART -A*i
-? t "'*0,,?,,,,,,
S A I a. Choose tlie.gorrect answer : 1-. ;,
''.''' (04 Marks)
=- I i) The g"""*f solution of the equation
^'p'
+ 3xyp + 2f : 0 i*'-'
:[i ' (e)"tv'*-.lixv-c):o tsi'tx-y-c)(x2ip-.;:o
H ; (C) (*y - ")
(i2y-c): 0 (D) (y-N,+)'dx2 + y'+ c):0x4)
E E
ii) The given differe#fal equation is solvable for y;i,f itiS possible to express y in terms of
''t:"'.,,,""''....;.,'.= :-l*:I
'(ffixandp
{Q),xandy (D) Vandx
es
AA (A) yandp
trxE .E iii) The singular solution of Clpiraut's equatrb't'S _
g+ 1f yl*e(*)+r[g(x)] tsl v:Jlt+(c)
E ! (c) cy + (c) **r,,,, (D) v g2(x) + f [g(x)]
$;
iv) The singular solution of the .goeia4_y= px - log p is _
! a (A) y2:4ax (B) *t'{F lofi x' *,(C) y: 1- rog (1') (D) *': y log x
3E b. Solve p' - 2p sin h x.- I :0. (04 Marks)
! s c. soire i:ip*ituntl 1rB.?1,-t
'imr (06Marks)
E E d. Obtain the general soHfioil=ard singular solution of Clajraut's equation is (y - px) (p-1) : p.
E S (06 Marks)
oi
fr ,3 2 a. Choose the correqi$answer : (04 Marks)
i E i) The complemertary function of [Da + 4] x : 0 is
-E E (A) xI.-'[c, cos t *czsint]+e'Icrcost+c4sint]
9.i (B) x= [cr cos t * c2 sin t] + [ca cos t + ca sin t]
E'$ (c) x:[cr +czt]e-'
ef (D) x: [cr * cz t] e'.
fr E ii1 rina the particular integral of (D3 - 3D2 + 4y: e'* is
-
: t --r'-r* -.r^r- 2 x
o i (A) x'e'* (B) x'e'* (C) x'e* (D) *':o-
;oi 6 b 6 G
4Trr {i
...:..:.::
E iii) Roots
"f
g*4+*5v : o are
-
dx- dx ''iir.,,:::::'
E (A) 2+i (B) 3+i ^ (c) 2+2i (D) -2+i "'ir;,
E iv) Find the particular integral of (D3 + 4D) y: sin 2x is
-
(B) -xsinx
8
(c) :r#a
b.
c.
I of4
(06 Marks)

2. d. Solve !I*u =re*,
fu
*r:y+e*.
dx"dx
Choose the correct answer :
a. Choose the correct answer :
i) The value of i [.'"Xaya* i,JJ
o0
(A) 0 (B) I
1OMAT21
(06 Marks)
(04 Marks)
i) The Wronskian of x and x e*,is
ii) The complementary function of x2y" - xy'- 3y: *' log x is--
(A) cr c-os (log x) + c2 sin (log x) (B) c1 x-r * c2x3.
ici crx + czx3- (D) crcos x * cz sin x. {:'f",,"
(l+x;:.t (B) (1+x):g- (C) (1 +x;2=.' (D) (ll*)':e'.
:quation ao(ax + b)2y" .| a1(ax + b) y'+ azy: 0(x) is
-
*"
'#q
Lv , &r+ryy.lv@Lrvu q.u4^ t u,,, J *zJ _ ,su u, "
(A)?S{p"ltaneous equation (B) Cauchy's linereftation
(C) dre linear equation (D) Euler's gqua ib. Using the vaffifon ofparameters method to solve the equati@'t + 2y'* y: e-* log x..
flu=,,
- .,5t' (o4Marks)
c. Solve *'!I-rzJ-illjr+(m2+n2)y:n2x'log*."
t'lt:=' (06Marks)
dx' '& -.d:
n i rr
d. Obtain the Frobenius mdffi solve the equation q:yff"t
d
(U) CIX -f CzX - (r-,/ (;lcos x -r s2 slrl x. .... ,,," {,,1,,"'
jii)To transform(1+x)2y" + (1+x)y'+ y =2 sin log (1 + x) into a l$ :dtfferential
$01 gquation with constant coefficient ,,,,,.,
*' F' ^
*
d'I
*
dY
-, = o.
'''S*
* . ",-- (06 Marks)
dx, dx
, !"ptu
# o*'
a. Choose the corect answer : /13 a (04 Marks)
g a and b from the relation
z - (*-u)' + (y -b)' fu ----------.',."E
qqi
(A) p'q' : 4z (B) pq; az (c) r = 4z (D) t : 4
ii) The Lagranges's linear pffdial differential eqlihtion Pp + Qq : R the subsidiary equation
is_ {"k"
(A) ax=dv=dz,;],$fu) !"=E=d' (c) $*Jr=a' (D) g(+q+q
R P,e}" P a R Q'".:-'"ft p P a R
iii) By the meth@f separation of variable we seek a solutibn I) the form is
tAl ,- ry' (B) z:x2+y2 (C) x:z+i (D) *:<*lvtvl
*"''-.'","
iv) The.sdkhio n of o,-1 : sin (xy) is
-
' ,.-#.,-
*ft!) ,: -*' sin (xy) + y (x) + 0(x) (B)
#.
x f(y) + $(y;
....,. n'.
'
^.. {.}*,
'-.,,,.,,,,,,
,- (c) z: -smf,r + y (x) + 0(x) (D) None ofthese. ' .,..
,r..o
{ q*rb. Form the partial differential equation of all sphere of radius 3 units having their cenffe iu the
' xy - plane. (04 Marks)
c. sbtvl x (y2 + z) p-y (x2 + z) q= z $2-f). (06 Markq)
, c,q,= c. Solve x (y' + z) p-y (x' + z) q= z (x"-f). (06 Mark-r}
#,1*
U u::jn.5jn"U of separation ofvariables to solve
*''
y3
-.u
x'
-
- o . (06 Marks) '" '1vL avL
v--+x--="Ax Ay
PART. B
(c) 3
2 of4
(D) %.
(04 Marks)

3. t..i.,iv) The value of B(3, %) is _ . -: ."
(A) ls (B) l! (c) ry 1n) 19
"a.:.-;, G ' 15
au^Ji
-/ t
, h**
b. chan ,.order
of integration in
{ I , or* and hence walu11;,,,,.,fsbme. (04 Marks)
4{i,4a
' i..
c. Evaluate
I j-f (I'* y' +z'1dx dy dz. ,, .:.::. (06 Marks)
d. Prove that i *' ,* x f' I u. - 7t
{.rlr-r* trq.f*-qJ, ,"*'
(o6Marks)
-{
a. Choose the correct answer : * * (04 Marks)
i) Let S be the closed boundarflsyq@ce ofd@gion of volume V then for a vector field f
defined in V and in S
Jf.nds
is
6 :,,,'=-="=
ii) If Jr.ar
where t=:*yijy'] andCirtfrd theparabola y=2x2 fromtheregion
(0, 0) to the point (1,2) is_
(A) 7/- ..# (B) -7/. (C) 3 3y (D) -3s/6 _r /O
iii) h the Green's tlteorem in the plane
f
uax +Ndy = .
"c
(A) ffT@*a*)*., (B) t(av aN). -
' ' {tl a, -a*]*" '-' {[r, - * f*' ._
{c) ff[+-*lo.o, to) 11[a.S]a.av'da Ay) *[d* q)
,, ,j,=i}i
A necessary and sufficient condition that the line integral
1i o; for any.'[4 "
C
('
'1"" 15 . p'*
ii) The value off (%)is _
1OMAT21
Q) J2" .(A) 2G (B) nJj
iii) The integral
{" f";;O Oxdy after changing the fiitegration is _
b.Usingthedivergencetheorem,evaluateJr.,aswheref=4xzi_y,j*y,iandSisthe
s
surface ofthe cube bounded by x:0, X : l,y = 0, y:1, z:0,2: l. (04 Marks)
c. Use the Green's theorem, evaluate
!!{z*, -vr)ax+(x2 +y2)dy where C is the triangle formed
bythe lines x:0, Y:0 and
^
* y:tl. (06Marks)
d. Veriffthestoke'stheoremfor f =-y'i+x'j wheresisthecircledisc *'+y'1l,z:0.
(06 Marks)
'l't.''""t1.
t
tt"'''='
3 of4

4. a. Choose the correct answer :
D L{sffi at} :
1OMAT21
(04 Marks)
(06 Marks)
d.
fcost ifO<t{he" rl^"'
Express rrtt=.1*rzt ;^";";; {.[erms
of up$i4 tunction and hence nno r-{r1t1}.
l/dq:a'
[cos3t if t>2n ,o"'
t '-" ]
choose the correct answer
(06 Marks)
F .:, :, (04 Marks)
i) r'l*,,[:)]= *i* .-t
t (u/i ----ffi '-ffm..
(A) sint -,..= ) ti'ut (&ff tq u' .,) sinh t
t -j" t '* #ryh t
( t I ok* {l
ii) r,{+}=.n5|.+.' - 36J r. "-=.-
. -iSLj
(A) !e* 19;
sin3t (C; sinh:t" 4m (D) cosh3t
t2
iiD
l-cosat
'----'-r-
a-
(B) l+cosat
a'
(c)
i+. a
'!,i'"1 'n i
'*,{L a
".,,q s[
',{{+.r}=
(A) t-:t+zt3
,,{#=}
(B) r+.i (C) t+1t,+r
32
b. Find
c. Using Convolution theorem evaluate r,{----t-}.
l(s+l)(s'+4)J
d. Solve 4*s9*oy=5e2, given that y(0) = 2, dY,i0)
=1 byusing Laplace transform method.
dt' dt ' dt
,06 Marks)
*****
4 of4
,. ,r1)
{a,
D/ -1;i{Q .rnoF$;-ldz, * _u, u) ffi' 1,.:,i
ii) If L{f(t)} = F(s) then L{e"'f(t)} is
=.
ii) If L{f(|} = F(s) then L{e"'f(t)} is ,::,,, .
t"
i,fu#,4 , (A) F(s+a) (B) F(s-a) (C) F(9 (D) None ofjhese
(, 1 -
*-dd
" ttJr-
-{"{^",$1, l+tan-'(s-l1 (B) I*tun,, (C)
}-*,'. 1o) cot-'(${rU*
ir) ttamsform of unit step function L{u(t-a;} is,
. [-4"
(A) g:. tg) L (c) { '* p) {
St;;:=ssr%,+s
b. Evaluate i{r*toszt-cosrt*triot}. . rdi=- (O4Marks)
t :-t J -*""''
c. Find the Laplace ffifrf.orm of the triangular wave, giver{ffi
It o<tcc""0.t-ld f(t+2c)=f(t). dffi,
* (06Marks)f(f)=l .'fLv):rt,,
.u*ry
l2C-t C<t<2C

5. USN t0clJiE,tzl22
ly 2014
,9.. Time: 3 hrs. Max. Marks:lQQr,,
i
f, }Vot"r l. Answer any FIVE full questions, choosing at least two from each part. r",, '.'
€' 2. Answer all objective type questions only on OMR sheetpage 5 of the answer btakiet.
[ -"'. 3. Answer to obieaive type q^uestions on iheets other than OMR will not be val*ii*''"'
f; ,, BKH
t I a. ii:ehror" the correct answers for the fbtt"*.g , -'. (04 Marks)
=
i) 'Calomel electrode is reversible with respect to,
B 4) Cl- ion B) Ag+ ion C) Hg]. ion D) None of these
i
? ii) A galvanic cell converts:|'
i 1] jlE al energy in to chemical energy . in;, ''
+ B) Chemidaf_.energy in to electrical energy
Bt C) ElectriCal energy in to heat energy
="""
1t"'i
F ili) The Eovalue of thi iJtl z"tzi.llu.'. lFe is if Ei** =-0.44and Ei^,. = -0.76
.e A) +0.32 V ts)"+L2 V , .:,C) -0.32V D) -1.2VE _', -'.- -
+ iv) Example of an ion selective e.lectrode is,
€ -:'.:.'-.-- -.---
E C) Platinum electrode _t','=',,, D) Glass electrode
E b. What is single electrode potentiAl.?'Ob.fu an expression for the same. (05 Marks)
E c. What are reference electrodesflE ain the censtruction and working of Calomel electrode.
€ .'- (osMarks)
! O. An electrochemical cell is constn cted by immeryng a silver wire in AgNO3 solution of
; 0.5 M and a Cadmium;wire in CdSO+ solution oT,0.25,,.,M at}5oC. Write the cell diagram,
$ ::l;1"::1":il;l?:;::i$i?;Jell
and change:inrree'enersv Given
' "-,;J:.:3
3
E 2 a. Choose the correct answers for the following : .. (04 Marks)
tr . l-,
g i) f@@sity of HzSO+to be maintained in the lead-acid storag€. $ is,
ts , ,,,.&)"0.5 B) 1.2 C)2.4 i'*' ,D)None of these
.S .iili'', Ih which battery, a key component is separated from rest of the battery prior to
E activation.
B ,r D-:*^., D o^^^-r^.., ra T)^^^-,^! A) Primay B) Secondary C) Reserve D) None of these
x
5' iii) The reaction taking place at anode of a battery
.j A) Reduction B) Addition C) Neuhalization D) Oxidation
iv) The electrolyte used in Hz - Oz fuel cell is.
First/Second Semester B.E. Degree Exami
Engineering Ghemi
A) KOH B) Nacl c) NH4OH
Explain the fo llowing b attery charac teri stics :
i) Voltage ii) Energy storage density iii) Cycle life
Explain the construction and working ofNi - Cd battery.
D) Kcl
b.
c.
d.
(06 Marks)
(06 Marks)
Explain the construction and working of Hz - Oz fuel cell and mention its applicatrons.
(04 Marks)
I of3

6. IOClf'lETzD2 .
3 a. Choose the correct answers for the following : (04 Marks)
i) Development of non porous and uniform oxide film over a metal surface due to
colToslon,
A) Decreases the corrosion rate
C) Does not have any effect
;", ., ii) Galvanizing is the process of coating of iron,
,-1,.r*,,,
._ A) With Au B) With Zn C) With Cu D) None of the.pe
,";.,,,,|,*., iii) Which of the following is an example of cathodic coating,
' ,,
'; ,. A) Galvanizing B) tinning C) painting D) Nonenflhbse
""'" ..""... iv) Evolution ofhydrogen type of corrosion occurs in, t*I,* ,
''=''.,'.'.,'."..'*,,.,,,,
A) Acedic medium B) Basic medium C) Both a and b D) Hlotle'of these
b. at is metalic corrosion? Explain the electro chemical theory of corrosiqih,, = (05 Marks)
c. Oiscuss the effect of the following factors on corrosion rate:
iii) POhrization (06 Marks)
i'
.,,,.,
t (05 Marks)
4a.
J,"#
Choose the condffiswers for the following :
i) Technological..inmortance of metal finisl
""i _: -
i) Technological importance of metal finishing ig tp inpart,
A) Corrosion residlcippe B| &lderabilityA) Corrosion residtaape
C) Thermal resistan&
#*,jn'
lf$art,
(04 Marks)
C) Thermal res D) All of these-.,.. 4I nlr vr lllw'
fr d€position is to,iD Use of complexing agbnt'during electrodi deposition i
A) Obtain shining deposit .' . : B) To check the metal ion concentration
D Natirte oxide film ii) Anodic to cathodic area
d. Explain tliblbllowing corrosion control methods:
i) Use of iirlifu,itor ii) Galvanisation
C) lncrease current density "'......,".', . .
The proess used to manufacture'P€;ts is,
A) Electoplating
iv) Electrolessplating
A) Catalytically active
C) Any surface ".'t.t,
A) Iso Octane
C) n - heptane
iii) Photovoltaic cell is a,
A) Storage cell
C) Fuel cell
iv) Knocking is due to,
A) Slow combustion
B) lncreases the corrosion rate
D) None of these
D) None of these
lating C) Phosphating D) None of these
(04 Marks)
B) c-Methyl naphthalene
D) Cyclohexane
B) Rechargeable cell
D) Energy conversion device
B) lncomplete combustion
b.
c.
d.
oelg on,
t''-;;{ff) Inactive surface
,. tr) Only on plastic sur ce
What is metal finishin6'?-M'ention any 3 technologitali,.ry.,portance ofmetal finishing.
',:,, ",.-- nj:r"': (04 Marks)
Explain the factorS'that influence the nature of elechodepq$l;
i) pH of electolylie bath; ii) temperature iii) cunent density (06 Marks)
What is elgetrdt€ss plating? Explain the process of electroless platlng of copper. (06 Marks)
.l-'o'."0 PART - B
a. Clw#gttre correct answers for the following ' ..,.,
litq'} Methyl tertiary butyl ether is added to gasoline to, iu
.;ll,}
."{,,..q A) T; increase the cetane number B) Minimize the knockin[';r-
,.-il C) To increase the efficiency of diesel D) Att of these ::
ii) Which of the following posses zero octane number,, "'i.
C) Instantaneous explosive combustion D) All of these
b. What is calorific value of a fuel? Explain the bomb calorimeter method to determine
calorific value of a solid fuel. (06 Marks)
2 of3

7. t0cH.Bl2l22
5 c. Calculate the gross and net calorific value of a coal sample from the following data:
i) Weight of coal - 0.73 g ii) Weight of water taken in caloffi,
equivalent of calori meter : 470 g iv) Rise in temperafll{e]}C
hydrogen in coal sample 2.5% vl) Latent heat of steam is S@,/atg-r
d. Explain the methods of doping of silicon to get solar grade si
a. Choose the correct answers for the following :
D Gibbs phase rule for general system:
A)P+I:C-2 B)P+F:C- I
i,.,, ii) Which of the following is a one component system,
ii) Neoperene.
B) Lead - Silver system ;n,
,. :::
D) None of these d
(04 Marks)
+F
*,"' A) Water system
- : i C) Iron - Carbon system
A) Li B) Cu C) Fe
i) Polyp-ethyl methacrylate.
a. Chomgthe correct answers for the following :
.,i)t"jf Akalinity in water is not due to,
..":{,,
' A) H- B) OH - C) COi
-'' i, ." ii) The tihant used in estimation of total hardness of water is,
A) EDTA
iiD Absorbance of light by a solution of a substance depends on,
,,,,
A) Path length B) Concentration ofSolUtion
e),,Wavelength of incident light D) All of these ..,,,,,
i,;r"'
iv) Flahre photometry is suitable for the detection of
D) Zn
b. State phase ruk.,piscuss the application of phase rule to water ryri.-.
c. Explain the prinoiple and application of potentio metric iitration with
titration. I
d. Discuss the conductci@$c titration and mention tffi;ffivantages.
7 a. Choose the correct *r*e*,fo, the following tr.,.,,,,,,,, ,,,
i) Which of the following is aco polymer?
A) Pollhene B) Nituik rubbq5., C) PVC
ii) Requirement for conductivity in pqlymer is,
(05 Marks)
respect to redox
(06 Marks)
(05 Marks)
(04 Marks)
D) Plexi glass
A) Linear structure " l-' ,,, B) Presence of oxidising or reducing agents
C) Conjugation ,,,,,,'Iiii,,,,,- D) All of these
iii) Natural rubber is polymerized form of,
A) Chloroperene B) Isoperene C) Propene D) None of these
iv) Benzoyl peroxide is used as,
A) Initiator B) Terminator C) P,,rupogator D) None of these
b. What is polymerization? Explain the addition polymerization's mechanism by taking poly
ethylene as example. (05 Marks)
c. Explain the meehanism of conduction in poly acetylene. (05 Marks)
d. Explain the manufacture of following polymers and mention the uses:
,,i
',
.
(06 Marks)
, ,*,,r,* (04 Marks)
,; . .1,.,f.
,
D) KOHB) E.B.T C) NaCl
iii) The reagent used in the estimation of sulphate ion in water is,
A) Phenoldisufonic acid
C) Alumonia
ir) Temporary hardness ofwater is due to,
A) Ca(HCO:)z B) CaClz
b. What is desalination ofwater? Explain elechodialysis method. (05 Marks)
c. Explain the experimental method of determination oftotal hardness ofwater. (06 Marks)
d. 50 ml of sample of water consumed l5 ml of 0.01 MEDTA, before boiling and 5 ml of the
same EDTA, after boiling. Calculate the total hardness, permanent hardness and temporary
hardness. (05 Marks)
:k***:f
3 of3
B) SPANDS
D) Barium Chloride
C) CaSO+ D) MgSOa

8. USN
t0ccPt3t23
une/July 2014
rammrng
First/Second Semester B.E. Degree
. Gomputer Goncepts and
"Time: 3 hrs.
I
Max. Marks:t.O,O
! ttr,. ,:r,
,,:: ri!
N'gi{ll;,.. Answer any FIVE full questions, choosing at least two from each part. ,',..
.g l_.,Answer all obiective type questions only in OMR sheet page_ 5 o{lhe ays.welbooklet.
ff 3. A"pqwer to objective type quesfions on sheets other than OMR will not b$rvalued-
-S " t .w !;,;L:: +'
'd
*
'fr-'l
I '.- PART - A x*:*.
6 ?"r". * th- r'
E I a. Choosetb"correct answers for the following (04 Marks)
C D A cd r.converts data into this _ 1
p".g A) infifrffiion B) charts C) softwary.;,'* D) input oroutput
H= ii) A device tlme4rolds a disk is called ' u' ,
; , -- -:a
^-^. ;
E ; A) drive i,,.rit"o B) RAM C) Rqlyl D) memory
o0"
=
i A) printer resolution B) printer speed C) printer output D) printer size
.=N
ar E r; ,,+-/ *'if"3(-{5
: fi b. Differentiate between system soit@_ffindffilication software. (06 Marks)
e 7 c. Explain with example, different typeffiffiters. (10 Marks)
(n$
ES
.:|:-
;er mQ{,9
,4' .f
paperd;/ D) slide rule
EqE=
8
-t 2 a. Choose the correct answers for*fi&fdtowir$ i..,-. (04 Marks)
trEr
: I i) A list of command choiws *ti an OS is dal{ed
s J
ttt) llle LsllllD uutD PEr irllv.. "Pll
rvrvrD LL, ::"'i;
.! I A) printer resolutioh,,.B) printer speed C) printer output D) printer size
E b
r) n llDL ul vulrulr4llu wllvlslp !r 4u v9 ro q#+.8!*
E"; A) command line B) check box C) drop down list D) menu
ooc
.g a ii ic nne nG*hp hpnefifc rrcitro neturnrL;L14
F E A) File secr
lE C) Protecti
iD is one gffi'benefits using network.
A; rile security',;," B) te*ipheral sharing
€ E C) Protectig ffm virus D) Fol@{',creation
-2" B "t^' t:*:
E ; iii) FTP sitespis"bften called
i? H
^ ^La.^:,;
-'"T:^-^L:.,^^ .,t --^,,^^":'=&E E A) chflql"Ieh B) archives
3 F iv) DOS and Linux are examples of _
ttt) l ne [ertns ools pEr,rqcn (opu relers ro a'-
A) printer resolutioh,p printer speed . C)'I
iv) The earliest computei *S9 -- sysffiq ,
A) digital B) paper$t# J) anpl+F- D)
Differentiate between system softvgfu{ qnd irpplication
A) chmnbld B) archives C) groups "'*i",,... D) domain
iv) DASffi Linux are examples of _ interface. .
Ad'ffi fashion B) GUI C) command lin6i-,.e"'D) parallel
l-*Jd:;r:;,{^+^.:l ,,^-:^,,. +-^^. ^f-o+,',a*1. +^*^l^^;-. ;4" ,,,,,",. tt
; 6 ,CffqTU tashron lJ) GUI U) command llne:r..r ,,,D) patatLel
l E b. ExpJain,in detail, various types of network topologies. {,';::ff' (10 Marks)
H E c. Define the following:
E
g i) Thrashing ii) Buffering iii) Spooling (06 Marks)
xc
ts;.
E E 3 a. Choose the correct answers for the following : (OdM",grks)
E g -.
t
D Which of the following is a character constant, ou-ii
3 #: ", A)'C' B) "c" C) "b" D) "?" ,1,
o#"' - ii) Which field specification is used to refer short int? " .
:
--.:h an/^ no/r /r o,/fr ro,/Ll
; . .. A) %c B) %d C) %td D) %hd
5 iii) A nibble is _.z
E A) 4 bits B) 8 bits C) 16 bits D) 32 bits
E iv) Identify formatted console input function.
3 A) getchar( ) B) gets( ) C) scan( ) D) fgets( )
b. Explain the structure of a C program. (06 Marks)
c. What are the different types of input and output functions? (10 Marks)
I of3

9. 4 a. Choose the correct answers for the following :
ficcP13l23
(04 Marks)
D A _ is name given to the memory location where data can be stored, accessed or
manipulated.
A) string B) keyword C) reserved word D) variable
ii)
'.t ;= iiD
4,.d'd
"-*""
A) Unary operator
C) Binary operator
B) Key operator
D) Ternary operator
D) infinite
(08 Marks)
(08 Marks)
The _ data type does not occupy any space in the memory.
A) long int B) float C) void D) double
An operator which acts on 3 operands
5 a. Choose the correct u *.rrfopqt. fotto*i"!-it, , (04 Marks)
i) The default return type 6f hhg{ion is, ,"Lh
*
A) int B) flo#"1,.,,. *
1** C) char D) void
flk) What is the output of the following code? ,*"* ";'*d.,,,^.*main
O **' fu'
i.ffi*rintf ("%d", 'A');) *
*#*
*'&f5 B) A C) 65.0 * mD) Error
b. Evahaffipxpressions wheri o: 8, b: 15, c:4. .f', .
D z.((aYi$y,$+Lb- 3)/(c+2))) ,',llH:,-'
ii) 100 120<=,....19=;5+100%10-20-:5>:1!:20 $qr," (06Marks)
c. Write a C progr&ult find and output all the roots of a guadratic equation for non zero
coefficients. '"".
.-n:;,'.' (l0Marks)
{r** *ART _ B 'J :
ii) Which is the user defined fu
A) main( ) B) sqtf4"6',-, ' C) clrscr( ) D) gets( )
iiD A function that calls itse
iv) Parameters to the
A) actual
C) no paramdbfs' D) non@f,these
b. Design and de$ahp a function rightrot (x, n) in C that i€tffifp Jhe value of the integer x
rotated to t$F{hfit by n bit positions as an unsigned intege*{ffq..k the tunction from the
q.
,**,,)t
-3
qj!- s
,,.L- ;u,,.
i::j .t,
main withdlifferent values for x and n and print the results with siii$able headings. (08 Marks)
c. How auff', irctions categorized based on the value returned by thiltfufierion and parameter
^^^a."s.(;lr,agcffi#cl? ,* (08Marks)
a. 6ffiose the correct answers for the following ' + ' (04 Marks)
::tor: A) break B) continue C) exit D) goto " *
ii) Several statements grouped together in braces is called ,.. #
A) compound B) equivalent C) complex D) simple *,..." .".
ii, In C language,"x?y:2" is equivalent to iW,_=
A) if (x : : 0)y; else z; B) if (x : - l)z; else y;
C) if (x ::0)y; z; D) if (x : : 1)y; else z;
iv) How many times is the following loop executed
for (i:0; i <= 5; i++;
{printf ("Hello");}
A)1 8)6 C) zero
b.
c.
Write a C program to find the sum ofN natural numbers.
What is the purpose of a switch case statement? Explain with syntax.
2 of3
7='=t
o+*-B) iterative function
=;pl none of these
functbn .,*1,*" called as
B) Mhal parameters

10. 7 a. Choose the correct answers for the following :
D The number of elements in array At3lt4l is
10ccP13/23
(04 Marks)
A)8 B) 12 D) none of these
ii) If A[4] is declaration, then the first and last array
.{- . A) 1,4 B) 0,3 C) 3,0 D) none of these a'
iil) A function that is used to string copy is , n - _,- --1, ; l;
"
1'.,,-1r; A) strcopy( ) B) strcpy( ) C) copy-string( ), D) concatp ; d 6
""'"
' ;' . iv) dirr"n Ailttzt : {1,2,1, q, i, e};The element in 3id row2nd col is *,{
o,
L lL J ) 1:;,,,:r.
. ;""' a a Er /. a 6 D 7 . ,4"
'"* ,,,0.r, A) 3 B) 4 C) 6 D) 2 .,,,.."
t'"
b.;'.,,Explaininitialization and declaration of 2D array. * " (08 Marks)
c. '$ffig-,u C program to input N integers in a single dimensional array- and sort them in
ut"Uffider using Bubble sort.
*,_
',,& -"' (08 Marks)
8 a. Chooseffi,mrrect answers for the following : -*{*=
'. (04 Marks)
: t.r-'"-^-.^^..r:^-
^r ^^ ;^^+^,^+:^- :- a na'-arrfa- -LhA+.. ;^ -^o^*^A oo ^o-olloli) '*;',, ecution of an instruction in a computermfft&fn is referred as parallel
computatibt _ d%"r" :". d'%
*" ;:
B) Serial C) Agppptte O) Simultaneous
lar.=j:
A) open multi pafuffism S ganized multi programming
C) open multi progi ring _i-:_"
D) organaed multi parallelism
iir) An example of environh{qnt variable inppen MP is
A) OMP_thread_limit u.-, B) OMP_init_lock
C) OMP_thread_ref " j .* D) OMP_get_byname
iv) Which of the following can b=g.-ffi?s resource in parallel computing?
A) Single computer with ryilti $roO€ss, B) Network of computers
C) Combination of aboyg='{f' u* i D) None of these
b. What are threads? Give the ffintages and disadraqtages of multiple threads. (08 Marks)
c. Design and develop a paraffil'program in C to determine and print prime numbers which are
less than 100 making udi8iffthe algorithm of Sieve of Erqtosthenes. (08 Marks)
,:"'..,..". :F***:f
=,.,,.,."j.u
,-*".,b q-*-''*
"" !
": :.j ;
4,-'b,' 1.*.:,4' 1g"i
..:.w. # q s
;-
I
1,. ; tl' :
. ;.''tl:'
" *-F',/
-
h-
I
ii) Open fr,f rta,iffi-1or
A) open multi paralHism
3 of3

11. First/Second Semester B.E.
.r;;1irTF.
m g.ffiB loElNls/2s
r B.E. Degree E$}Itarg$rYn"e/Julv 2ot4
Basic EleetronlH$-=r'z
USN
'
l'
-'.1.
,l.T[ne: 3 hrs. Max. Marks:-]00,::,
. Not$:'L. Answer any FIVE full questions, choosing at least two from each part. - . i
.g tA"swer all objective type questions only in OMR sheet page 5 of the awwer"booklel
fi 3.".A&swer to objective type questions on sheets other than OMR will noJb[fualued.
o.
d
E -^-- ^a :..,..:: .... PART-A , ::.:-:,
(d .. ; ,&,, t
E I a. Choosd'the,,correct answers for the following : ,,,, :i 04 Marks)
$ i Zener diode can be used for rectification. This statement is; '''
E g A) true,ri],,'' B) fa1se.'.L"''",,,,,",,
''
8.E C) neither (iiuid nor false D) none d$these
yf
E * ii) The maximume,fficiency of fulIwave rectifier is :,:,,.,,,
o*
l,' A) 40.6% B 60.4% C) 78.s% D) 8t.2%
troo
=
*, iii) The knee voltage of a silicon diode is _.'E +-
H qa A) 0.3V Blqsv -
ir, C) 0.7V D) none of these
; : iv) If f Hz is the frequency of$e input givd#tb a half wave rectifier, the output frequency
ts6
E 'F i'r, .tr 1, ,doB
R q At)2fHz B) fHi+";,,,.'.,,,,,.......,,,,. C)3fHz D) 0.5fHzE g
^)
/-L LtL D) L ttL
:1,:..-::,r::::::,,,,,,,:::::
v) JL ttL u) v.JL LLL
F r :::::: ::
.-a
E E b. Draw and explain the VI -.fruratG;titics oFa.ffi-diode and Ge-diode. (06 Marks)
b U i:::;:. rr i*r. s, . .. rl r :r L:c. ,, -,-a
; ; c. With a neat circuit diagrarn, explain the working principles of full wave bridge rectifier and
F" i show that the ripple factor : 0.48, and efficiency = $t.2o/o. (10 Marks)o0tr
.9(!
E5 t,
=E!s5Ei
:, X 2 a. Choose the correct answers for the following : (04 Marks)
:'o
'! e i) The current conduction in BJT is because of_.
E E" A) electrons B) holes
E q C) F-oth electrons and holes D) none of thebe,."}*
; E ii) If a i 0.95, then the value of B of transistor is _.
; s A) 0.05 B) le c) 100 D) 120
E 'E iiil Common collector affansement is senerallv used for
E E iv) The current relationship between two current gain in a transistor is _
$P A)p=-g- B)p=l*o c)p=l-o D)B=-ljg
55
'-'Y l-a "'Y l-a "tY l+a B
E fi iiD Common collector affangement is generally used fot
-
6 F A) impedance matching B) voltage amplification
lE - 'it.
"'; ra ^-.-.^.^+ ^*-r:{:^- T *^.^^ ^f+L^^^ "':".':"".:l
E * .. iv) The current relationship between two current gain in a transistor is _. ..'
ES
50
.-.:e*i
s b. Draw input and output characteristics of an NPN transistor in common base configuration
o
Z and explain. (10 Marks)
E c. For a Silicon transistor crdc - 0.gg5, emitter current is 10 mA and leakage current I.o isF
3 0.5pA. Find Is, Ie, 0 and Icso. (06 Marks)
1 of3

12. ').
10ELN15/25 ;
(04 Marks)3 a. Choose the correct answers for the following :
i) Which of the following factor affects the Q-point stability?
A) I"o
C) emitter resistor
B) coupling capacitor
D) bypass caphcitor
ii) The inter section of the dc load line with given base current curve is the
A) h-point B) D-point C) Q-point D) none of thestil:,.r
n s .ii
iir) For an emitter follower, the voltage gain is
The best biasing stability is achieved by using biasing method. ,,,,. '
A) fixed B) collector to base C) voltage divider D) roni of these
;, '""',,
"
"''
n.{he working of collector-to-base bias circuit using an NPN transisor and derive the
i ,ii;,
b.
equanOm#gr lB. ,,,,,,,,.iii",,,,,,,_"'
' (08 Marks)
c. Define st5bitity factor and discuss the factors that cause insability of biasing circuits.
,,:,
,,,,:,t,
,.
i,.'0"* ""
(08 Marks)
eQuatloffiftSf fs. ::::::. ::'' 't (08 Marks)
nanr n
{
.;::1..':,=..,..,i: PART * B !. ?r ..
i) Osc-illffir uses _ tlpe of feedback.
$'==fo'sitive B) negative C) reverse D) both A and B
il) ,.jffe frequency of oscillations in an oscillator is given by _ . .,....,,"
- A) := B) 2nLC c) 2nJrc D) ,
l=
=,
' 2nLC ' )".|y-C
{- -=
iir) With negative feedback, the bandwidth of an amplifier _
A) decreases B) increases c) both A and B D) constant'
iv) The magnitude voltage gain at half power frequencies of an RC coupled amphfi'er is
_ times maximum voltage gain.
A) 0.707 B) 7.07 C) 10 D) 17.06 ".,
b. Draw the frequency response of an RC-coupled amplifier and explain it. Mention its
advantages and disadvantages. (08 Marks)
c. Explain with the help of circuit diagram the working of an RC phase shift oscillator using
transistor. (06 Marks)
d. In a transistor colpitts oscillator having tank circuit parameters as c1 : 0.001 pF and
c2 :0.01 pF if L: 5pH, calculate the frequency of oscillations. (02 Marks)
i) FET is controlled device. [;,
A) voltage "",*:.. B) current G),,pulse D) power
ii) PNPN device is an" "''.
A) UJT ffi4CR r'4,* C) MOSFET D) MODFET
iir) used as a rehxhtion oscillator.
A) MOSFET B) SCR C) BJT D) UJT
iv) The intrinsic standoffratio of'Iitrffi-*"
A) equal to one B) must be less than unity
C) must be greater than uffi.;{ ' .,,,,,,,,,,,,,
D) must be zero
':it l.:i]q-,r,
b. Explain the working of tw-d-,fCnsistor model onu*SCn and obtain the expression for the
anode current. -
,,...= '-:1 (0g Marks)
' c. Draw the equivalent cffi#it and Vl-characteristic of UJ{ and explain it. (08 Marks)
A) unity
2 of3

13. 10ELN15/25
6 a. Choose the correct answers for the following : (04 Marks)
i) The gain of the voltage follower is
A) zero B) infinite C)
ii) Ideally open loop gain of op-amp is
A)0 B)1 C)*
1 :! iii) The CMRR is given by_.,::'
'':'
,:,,r;;,,,":',,,. A) Aa
'' B) A*/Ad C) Ad/&
aiv)Maximumrateofchangeofoutputvo1tagewithtimeisca11ed
,,;.,.,,.. A) CMRR B) slew rate C) over rate D) nou4,bf these
"''',,,''',,, *,t:;'""""""
b. Lilt& characteristics of an ideal-op-amp and draw the three input invertliry'Summercircuit
usinglm'op-amp and derive an expression for output voltage. , 1., (08 Marks)
c. Draw tffibasic block diagram of a cathode ray tube and explainl . (08 Marks)
,:;#,,1,,, . $'
7 a. Choose the corlwtaanswers for the following : " ,{}:*' (04 Marks)
i) Two's comp"HaX!.tof (1001)2 is _ ,
*
A) 1001 B) 0010 c) 0111 D) 1010
ii) To represent 35 in binary, number of bits required is _
A) 6 ,'prl ,. ,C) 4 D) 33
iir) Decimal number 37 is rdif-poented inBCD 6y
A) 100111 B) 00+.1,1 1 '',,,,,--,, C) 00110111 D) 111100
iv) Over modulation exists when ion index is _
A) 1
"'
0 ,,,,-.',,
=,,_ .. a, ,t D) < 1
.:: .:. . :
b. Explain the need for modulatiq;-.., ' i' (06 Marks)
c. Convert(A3B)ro:( )ror# Q47.75)rc:( ')r,. (04Marks)
d. i) Perform (FC02A)16-=.(ffiSZ)ru using 16's corylement.
ii) Subtract(4317.64),x'.fr.om(42.345)3 using 8's comffipiyrent. (06Marks)
8 a. Choose the corr-ebt''l rswers for the following : '! - - (04 Marks)
i) The expression for half adder carry with input A
TLB isgjven by _.
A)h;{#fB B) AB C) A B -*4- D) none of these
.i
,:ii :::
ii) Ttrtu"EomplementofA+B+ lis ir.,,,"",,,,,,,.tr)
,
r*rswvurHlwu .t*fj '::::::'
,'.,A)0 B)A+1 C)AB+I "':)1
-iu].,,,::'ABCD
+ ABD is equal to _ " ,,1$4 .
A) ABC B) ABC c) ABD D)'A,qH*,
"'iv) A+(B+C):(A+B)+Cis_law. "..
A) associative B) commutative C) distributive D) none offhpse
t'.,,,,,,j'
,,,,:,,,,,"1:'
Design a full adder circuit andreaLize, using two half adders. (08 MriIsF
Simplify the following expressions and implement using only NAND gates :
i) Y=ABC+eec+ngc+agC
ii) Y=eg+AC
iii)Y=A+Ae.
*****
3 of3
(08 Marks)

14. rv18/28
USN
i,,-:tr'.ds
=Timp:
i#i'"
1.
)
3.
First/Second Semester B.E Degree Examination, Jrn
Environmental Studies
(coMMoN TO ALL BRANCHES)
2 hrs.l [Max.
,{,? INSTRUCTIONS TO THE CANDIDATES
{Atlc.wer all the fifty questions, each question carries ONE mark.
Use only Black ball point pen for writing / darkening the circles.t ,.
For each'''question, after selecting your answer, darken .t$B,,dppropriate circle
prohibited.
correspondin$p jhe same question number on the OMR$hpet
4. Darkening two Cirples for the same question makes tlr(atswer invalid.
:: "':' ' ;h;"OMR sheets are strictly5. Damaging/overwritif,g.- using whiteners o$--
::. .::
M-l
:a--a,
-'a,,a .
::..::""' ::::
1. The air prevention and control ofpollutien=& was enacted in the year-
- tnot 1 ina, - tnol
a) 1987 b) t974 . c) 1981 d) 19s6
2. Smog is formed by the reaction ofiuhict air pollutants-.
a) Smoke and Mist. b) Sm#dhnd Fog .)W: and Bio-Gas d) Smoke and Dust
.,,it.."=' {fl::},+
3. Which of the following isfrot a solution for Global Warmi"rffi**
a) Reducing use of,fffi fuels b) Planting r{rffio.trees
c) Deforestation ' d) Reducing vehitu'nar transportation
4. Methemogl"obirremia is caused by the contamination of water due to
-a$.1
a) Mergugy'.
- b) Nitrate c) Arsenic ,.$ Nitrates
5. gu y is celebrated on every year
" 4,
.."1Sr,""
iz b) sept.22;d c) Aprll22"d a; runer{,,,
*
^ " *,r,-j
'6i',:,, HIV can be transmitted to humans through which media? - "',
a) Air b) Blood c) Virus d) Hereditar, "' ..,,,,,-.,,,
7. Mineral resources are
a) Renewable b) Fossil fuels c) Non-renewable d) Sedimentary rocks
8. World Ozone day is being celebrating on every year
a) 15th Sept. b) 16th Oct. c) 16th Sept.
C1
d) 22nd April

15. 9. Contribution of carbon dioxide to global warming from industries
a) 50% b)24% c)25%
10. Which atmospheric layer is closest to the Earth's surface?
10clv18 t28 '
d) 75o/o
d) Thermospherea) Mesosphere b) Troposphere c) Stratosphere
:....11.ozoneispresentinwhichlayeroftheatmosphere
i-,l,-.;
,a) Ozonosphere b) Stratosphere c) Troposphere d) Ionosphere "
12. yhat is the maximum allowable concentration of fluorides in drinking water?
_ -_'.=',,r:.
a)"t.gJnsn b) 1.25 mgll c) 1.50 mg/l d) 150:mg/l
13. Which'"of following gas is not concern to green house effect? 5'.=
w
.i"#,@
a) co2 'ffid.- u) cH+ cl soz -..1'
;b H2o vapour
, ,11'"1t1'
''
14. Which of the follffig is not a renewable source of energy?
a) Solar ' ;,,,,,,,p)
Wind c) Nuclear o
r.*o ' d) Geo-Thermal
15. Optimum growth of bactbriajn favorable PH value of o-ffi
**'
a) 6.5 - 8.5 b) TSP* c) 6.Wf Y.5 d) 7.0 - 14.0
-
g
"'"
16. Eutrophication means
a) Quality of water in lakes - ffi) Enrichment of plant nutrients in water
c) Water purification technique "-
i4"li - d) Meeting point of river and sea.
Pj ::+
17. Earth's body temperature is approxjffily fr"qt to- _? z (STITI.'IF
a) 16.4"C u; ro.o;c r):o'c i,/#
a) Rich content of oxygelq' b) Orgaalii'kr ':q[o* .,!,*:/c) Turbidity
, *:tI=-'
d) Physical imsurities '9r.f6'l:.1 '
19. Which of the fo[orki&g is a natural source of Air pollution? "
'*,
-
a) Acid .uT,l1;;:.' b) Precipitation c) Storms
i
d) Volcanic eruption
20. Effect o,f$*bbn monoxide on blood, causing
a) H-eqO3 b) CoHb c) Co2Hb d) HbCo2
' r:a'
:.
.,,,:,, ..
... :;.
21. Anthropogenic activities means.
.
.,,4
",
Naturaimade b) Biological c) Manmade d) Anim-lM
' 'i,:,:lt'
_=.;^W. Which of the following energy source is less eco-friendly? ' , # *"'= a) Wind b) Water c) Solar d) Thermal . u
23. Which of the following is a biotic component of an ecosystem?
a) Sunlight b) Fungi c) Temperature d) Water
24. Generation of wind energy is mainly based on which factor
a) Direction.of wind b) Storms c) Velocity of wind d) Wind pressure
C2

16. 10crv18/28
25, Example for abiotic component of eco-system
a) Plants b) Food c) Water d) Live stock
26. Expansion of the term WWF is
-
.,,,,i"., ,, a) World wide life force b) World wide forest .. ry,,..,'t,,]-...c)Worldwidelifeforestd)Worldwildlifefund
2fu,'.'Maximum allowable concentration of total hardness as per BIS in drinking water +t -
a)600 mg/l b) 300 mg/l c) 1000 mg/l d) 250.,nigA*
' ::' '::, .i!' !'.'
''
28. Watq,flotlution prevention and control Act was enacted in the year_ ,::'1"' .
a; t986,,::''.. b) 1974 c) 1981 . ;d) tlAZa) 1986',"'':: b) 1974 c) 1981 i d) I
29. Stone cancer igau effect of _ '--j <7t;u):
:,,,,,,,, .:
,". i,.,,
3r lqqxr-e,
charl$.
"r.x _
Most stable Eco-system i. _ ,,li/ *t*rru*._ . ;
"
.
a) Mountain b) oc-ean ii ",et
aT,YJ |f;$gg;tio, d) Fossil tuels
31. Example for tertiary consumers 'l*-:-**
#,,"a) Plants b) Cattle r'C JLir-'.'c) Snake d) Elephant
a) Climatic cnffi u) nara wat.rd-*:&t Q
Acid rain u*
{.'* d) Excess of calcium
t
*4"1' '' '''
32. As per BIS, the minimum allowable limi$difon content in drinking water is _
a) 1.0 mgll b) 0.2 mg/l ,""&s c) 0.3 mg/l d) 0.5 mg/l
/*=d i
33. In Hydro-power plants, power is ge,Wr6ted bV__# .=
a) Solar b) Thermal c) Sgter d) Coal
u-*5: ';?
34. The PH value of acid rain was recorded in early days ;
a) 2.5
""
j) 7j5 c) 4.7 '::''" . d) 5.7
.........'..............
35. First international #f ;**it was held at ,'" ',,,,*t::,.
,, :.rd"" -,
a) USA
*ffi;i':l
b) Russia c) Rio de-Janeiro .;".";1^ d) Johannesburg
36. Bhopal.g-cB,kagedy was caused due to leakage of
-
'fuf .*
a) ciTd:,.:',.='
- b) Mrc - 4 soz alF..9r4i.ia",
37. I4i$,fr;taka state pollution control board was established in the year r
,{,.=
a) 1984 b) 1976 c) 1974 d) 1933 "''"'',
..'
...'..-.,
',38.Amongalloxidesofnitrogenwhichoneisresponsiblefortheformationofacidrain
39. The liquid waste generated from municipal solid waste disposal pits is called
a) Nitrous oxide
c) Nitrogen Trioxide
a) Solid waste water
c) Leachate
$
b) Nitric oxide
d) Nitrogen pentoxide
b) Sewage
d) Compost waste water
-c3-

17. 1
:- -
10clv18128 -
d) s5dB
40. Minimum allowable limit of noise pollution for Human persistence is _
a) 40dB b) 90dB
41. Demography means
c) 45dB
.,4 = a) Study on forest b) Study on Human activities
' .{:n'.,. c) Study on earthquake d) Study on population growth
I
42;','Freon's are called
'*a)4ydrocarbons b) Ozone c) Methane d) Solvefits'
."/fi, .
Whiffithe following is a biodegradable pollutant? ,.-
a) DDffti ) Sewage c) CFC lp Freon's
&r
"
' ::',
44. Percentage ofground water available on Earth's environment is . fl1** r
a) 0.02 -
,= b) 0.5 c) 1.5 n ,
45. During green house effi,parbondioxide and water vapour6ffiorbs.
a) Short wave radiations {',"ed.- b) Lo4g,nwd'vb radiations
c) Solar radiation '",,1F"_ d) Uv'fdiations
46. Amount of carbon dioxide
a)2r% b) 0.383%
. *{ ; '4 c78% d) 0.313%
!drd
47. Estuarymeans :ffiA."s
=,
""""'ii--.
a) Rich in nutrients *,...:,,i " b) End point of the rivera) KlCn m nutrrents *,,.',u,,r' : ol Eno pomt oI tne nver
c) Meeting place of river and s"a,,,,_''',.o $-lTreatment of water
48. Physical pollution of water is due to
a) lhbrides ul ffiF6iaitv c) PH , d) All of these
**
-' .-"-r")
"''':' "'
':::::'"
'
,*r"? " . .*
49. Control of water Bh#te diseases can be achieved effectively in a o$_ffiunity by
a) DefluoriirylW- b) Disinfection c) Sterilization
""
' *U)
Vaccination
50. Ozone lay.di'.'thict ness is measured in which units
*
f,'l
'"" -,::"':'
a) PS{.'h"' b) PPB c) Db dfD{L
.*.'. ': t,'
!l: / "., '"'ll
'q*.*" , ^
M.1,* *r.*1.* 'Jsr
:I
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