chemisty stream (2012-july) question papers

USN t0cIIEtzl22

B) Calomel electrodeD) Silver - silver chloride electrode

B) Pt-electrodeD) Ion selective electrode

(04 Marks)

B) H:SO+D) None of these.

B)Ni- MHD) Zn - MnO2

(04 Marks)(06 Marks)

FirsUSecond Semester B.E. Degree Examination, Jrune 2Ol2

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Time: 3 hrs. Max. Marks: 100

Note: 1. Azsrver any FIVE full questions, choosing at least two from each part.Z Answer all objective Ope questions only on OMR sheet page 5 o;f the answer booklet.3. Answer to objective llpe questions on sheets other than OMR will not be valued.

PART - A

1 a. Choose your answers for the following : (04 Marks)i) The standard reduction potential of Mn and Fe are - l.l8 V and - 0.44 V respectively.

The standard emfofcell formed by combining the above two electrodes will be

Engineering Ghemistry

B) - 0.74 VD) - r.62 V.

A) + 0.74 vC) + 1.62 V

A) SHEC) Glass electrode

A) Glass electrodeC) Calomel electrode

A) KOHc) Lic.[

A) Ni-CdC) Pb - Acid

ii) Primary reference electrode used to measure the electrode potential of other electrodesis

iii) Reference electrode used in potentiometric determinations is

b.

c.

d.

2a.

iv) If the direction of flow of electrons in electrochemical cell is right to left then the cellreaction is

A) Non spontaneous B) SpontaneousC) Reversible D) Ineversible.

An electrochemical cell consists of metallic zinc immersed in 0.1 M Zn(NO:)2 solution and

metallic copper immersed in 0.2 M CuSO4 solution. Calculate emf of the cell at 25oC andchange in free energy ofthe cell reaction Eo cell = 1.1 V. (05 Marks)Emf of the cell Ag/AgNO:(C t) /l (Cz = 0.2) AgNO3 /Ag is 0.8 V. Calculate Cr of the cell.

(03 Marks)What are ion selective electrodes? Discuss the construction of glass electrode and derive anexpression relating glass electrode potential and pH. (08 Marks)

Choose your answers for the following :

i) The electrollte used in alkaline fuel cell isA) HZSOI B) KOHC) KCL D) NHqC,I

iD Hydrogen absorbing negative electrode is used inA) Ni - Cd - batteryC) Li - MnO2 battery

B) Ni-MH batteryD) Zn - MnO2

iii) In hydrogen - oxygen fuel cell the electrolyte used is

.'.--i ',, '.-,,'./-,,.-.:'/

l ':'l --c i:r! ! :' t'-_i -cl.[r" l'' l1

| ,...1 ve' ,.,...) - 1 jl

['\ tuoto'' "

''' 'l\"\-?1)"iv) In which of the following battery the overall cell reaction is note reversible?

b.C.

d_

What are rechargeable and reserve batteries?Explain the construction and working of nickel - metalhydride battery.What are fuel cells? Explain the construction and working of methanol oxygen fuel cell.

(06 Marks)I of 3

3 a. Choose your answers for the following :

i) In galvanic corrosion the less active metal always acts as

t0cHEt2t22((X Marks)

B) CathodeD) none of these

B) Ca(OH)zD) CaCO:

B) AnodeD) None of these

B) KOHD) HCl

(04 Marks)are deposited on catalytically active surface in

B) Electroless platingD) Electrophoretic painting

B) Pb - Sb alloyD) Copper

B) LevellersD) All the above.

B) Sodium AcetateD) Sodium succinate.

(04 Marks)(06 Marks)(06 Marks)

(04 Marks)

B) Cetane numberD) Compression number

B) 500 - 600.cD) 1500"c

B) AcceleratorD) Catalyst

B) Ni, Co and CrD) Zeolite

(06 Marks)((M Marks)

ii) Caustic embrittlement ofboilers is due to presence ofexcess of

A) AnodeC) Both anode and cathode

A) Na2CO3C) CaSO+

A) CathodeC) Anode and Cathode

iv) Electrolyte used in anodizing of aluminium is

A) H2SO4

c) NH4C1

iii) In differential aeration corrosion the area more accessible to air acts as

b. Explain the following types of corrosion i) Galvanic conosion ii) Stress corrosion. (06 Marks)What is anodizing? Explain the anodizing of aluminum.

d.

4a.

5 a.

(05 Marks)What are corrosion inhibitors? Explain how corrosion is controlled by inhibitors. (05 Ma*s)

iii) Concentration of metal ions in plating bath is reduced by addition of


i) The process in which the metal ionspresence of reducing agent is

A) ElectroplatingC) Immersion plating

iD In electroplating of chromium the anode used isA) AchromiumC) Nickel

A) BrightenersC) Complexing agent

A) Octane numberC) Compression ratio

A) 200 - 300'cc) 1000- 1200.c

A) InhibitorC) Ant knocking agent

iv) Catalysts used in catalltic converter isA) Pt, Pd and RhC) SiOz and A"tzO:

What is knocking? Explain its mechanism.

iv) Reducing agent used in electroless Nickel plating isA) FormaldehydeC) Sodium hypophosphite

b. What is electroplating? What are the advantages ofelectorless plating over electroplating?

d.Explain the process of electroless plating of Nickel on aluminum.Discuss the chromium plating process.

PART - BChoose your answers for the following :

i) Quality of Gasoline is expressed in terms of its

iD In fluidized bed catalytic cracking process, the cracking of heavy oil takes place at

iii) Methyl tertiary butyl ether is added to petrol which acts as

b.c.d.

Explain the construction and working of photovoltaic cell.What is biodiesel? Explain the biodiesel production by transesterification of triqulyceride.

2 0f 3 (06 Marks)

6a. Choose your answers for the following :

A) SHEC) NI{E

b.

c.

7a.

t0cl{Bl2l22(04 Marks)

B) Calomel electrodeD) None of these

(04 Marks)

B) PropeneD) Styrene

B) Unpaired electrons

D) Cations

B) Second order transitionD) Multiorder transition

of addition polymerization taking ethylene as a(05 Marks)(05 Marks)(06 Marks)

(04 Marks)


i) In potentiometric redox titrations platinum electrode is used in combination with

ii) Condensed phase rule is applied for a system consisting of:A) Two component B) One component

A) Visible range B) IR range

C) Multi component D) Three component

iii) Lambert,s law states that intensity of monockomatic light decrease exponentially with

A) Concentration B) Path length

C) Time D) DensitY

iv) In flame atomic emission spectroscopy the emitted radiation lies in

C) UV range D) None ofthese

Define the termi phase, component and degree of fieedom and explain the application ofphase rule to watei system. (08 Marks)

what is the principle of flame photometry? what are the processes that occur in the flame?

Explain the various components of flame photometer. (08 Marks)


i) Addition polymerization is also calledA) Step p;lymerization B) Chain polymerization

C) Condensation polymerization D) none ofthese

ii) Natural rubber is polymerized form ofA) IsopreneC) Butene

iii) Free radicals are reactive species havingA) Pabed electronsC) Anions

iv) Glass transition temperature of polymer is

A) First order transitionC) Third order transit ion

b. Explain the free radical mechanism

c.d.

8a.

. monomer.Explain the manufacture of plastics by injection moulding process'

What are polymer composites? Write a note on Kevlar fibre.


i) Temporary hardness of water is due to

A) C;@COr, and Mg(HCo:)z B) CaCl'2

b. What is alkalinity of water? Explain the determination of alkalinity of water' (06 Marks)

c. 20 ml of sample of coD analysis was reacted with l0 ml of 0.25 N KzCrzOz and the

unreacted dichiomate required 6.5 ml of0.l0 N Ferrous ammonium sulphate. l0 ml of same

KzCrzOr and 20 ml of distilled water under the same conditions as the sample required

C) CaSO+ D) MgSO+

iD Potassium chromate is used as an indicator in analysis of water

A) Hardness B) Alkalinity C) Chloride Dt Fluoride

iii) Brackish water can be desalinated byA) Electrodialysis B) Reverse Osmosis C) Filtration D) both A and B

iv) The method adopted to analyze dissolved oxygen in water is

A) Volhards B) Winkers C) Argentometric D) Dumas

26.0 ml of 0. I0 NFAS. What is the COD of the sample?

What is desalination? Explain the desalination of water by electrodialysis.

{<r.**rf3 of 3

06cH.Bt2l22USN

First/SecondSemesterB.E.DegreeExamination,,June2o|2

Engineering Ghemistry

Time: 3 hrs. Max Marks:l oo

Note: 1. Answer any FIVE full questions, choosing at least two 'from each part'

2. Answer alt obie"'tu" ;;;;;;;;;in' ontt i oMR sheeipase 5 of the answer booktet'

3. Answer to obie"t* ;;; ;;;;i;n' on ih""t' other than OMR wiII not be vatued'

PART - A

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1a. Choosethecorrectanswersforthefollowing.(04Marks)f l"-

- Wt,th one of the following is not a primary fuel?

' ,q.) coal B) c'rude oil C). natural gas D) kerosene

ii) The method used for obtaining synthetic petrol is

A) catalytic cracking B) bergius process

C) refining D) none of these '';iii) The knocking tendency ot hydrocarbon decreases inthe following order /i*

A) straight chain > cyclo alkanes > aromatic > brancheo cnam t;'/Bjstrailhtchain>branchedchain>.cvcloalkanes-"::1'l]: ll;:f cq

Ci ,r"rfi",i" > cyclo alkanes > branched chain > straight chain \ti\ni .y"f o

"f f."r" t aromatic > branched chain > straight chain V)

iv) in ftoto uoltaic cell solar energy is utilized to transform '\A) solar energy into light and heat energy

b.'

B) solar energy into electrical energy

C) sola, energy into electrical and chemical energy

D) none of these

Describe the experimental method of determining calorific value of a solid fuel using bomb

calorimeter. (06 Marks)

A";i;*lh" gross and net calorific values of coke sample using the following data :

Mass of coke = 0.85 ' rtllj'ig' mass of - y*:i. ; 2 0 ks' warer equivalent of

calorimeter = 0.6 kg. sp.heat ol tt,?t' = +'tgZ LJkg-rK-r' pt"tnfgt of hydrogen in fuel

sample = 5olo, increase ,n ,.rnp",ut'[ = 3 S K' latent ileat = iqsl *l*e' ' (04 Marks)

Explain the process of doping oi Ji"o' Give two applications of photovoltui" t"llttou *u.url

Choosethecorrectanswersforthefollowing(04Marks)i-'-

- oaniet cell is a combination of standard electrodes of

A) CuandAg rlz' anJia C)ZnandCu D)CuandCd

ii.) The concentration cell stops working when

A)Mr >Mz B)ff,;M, " t'''=1,{' D) None of these

iii) Calomel is the commercial name ofAj mercuric chloride B) mercurous chloride

Cj mercuric sulphate D) mercurous sulphate

iv) if," fot"ntiuf ofihe calomel electrode varies with the concentration of

Ri meicuric ctrtoride B) mercurous sulphate

Cj mercurous chloride D) potassium chloride

C.

d.

2a.

lof4

06cHEt2t22

b. What are reference electrodes? Explain the construction of AglAgCl electrode. Give half-cell reactions. (05 Mafts)

c. An electrochemical cell consists of iron electrode dipped in 0.01M FeSO+ solution andcopper electrode dipped in 0.lM CuSO+ solution. Write the cell representation, cell reactionand calculate emf of the cell at 298 K. Given standard reduction potentials of iron andcopper electrodes arc -O.44 V and 0.34 V respectively. (05 Marks)

d. Define single electrode potential. Explain the determination of potential of Zn-electrodedipped in 0.5M ZnSO4, using standard hydrogen electrode. (06 Mafts)

a. Choose the correct answers for the following : (04 Marks)i) Which of the following is not a rechargeable battery?

A) lead acid B) Ni-metal hydride C) Ni-Cd D)Zn-MnO2

D)Li-MnOzii) Which of the following is a reserve battery?

A) Zn-air B) Ni-metal hydride C) Zn-Ag2Oiii) In hydrogen-oxygen fuel cell which of the following electrolyte is used?

A) H2SO4 B) NH4OH C) KOH D) CHTCOOHiv) .The concentration of sulphuric acid to be maintained in lead-acid battery is

A) l0M B)5M c)lsM D)2Mb. What are primary, secondary and reserve batteries? Explain the construction and working of

Zinc-air battery.c. Explain the construction and working of methanol-oxygen fuel cell.d. Give the advantages of fuel cells over batteries.

a. Choose the correct answers for the following :

i) Water-line corrosion can be explained on the basis of


(04 Mafts)

PART - B5 a. Choose the correct answers for the following : (04 Marks)

i) For an electrolyte mixture containing Cu2', Zn2* and Cd2* the order of electro

iii) Which of the following metal is used as _ anode protection to iron?A)Zn B) Cu c)Ni D) none ofthese

iv) Which of the following acts as oxygen scavenger in cathodic inhibition?A) Na2SO3 B) Na2SO4 C) ZnSO+ D) NiSOI

(06 Marks)b. Explain differential metal corrosion, with a suitable example.c. Discuss the effect ofthe following on the rate ofcorrosion :

i) Anodic and cathodic areas ii) Conosion product iii) Temperature (06 Marks)d. Write a note on anodic protection. (04 Marks)

deposition isA) Cu, Cd, Zn B) Cu, Zn, Cd C) Zn, Cd, Cu D) Cd, Cu, Zn

ii) When the object to be plated is inegular, the process employed is

A) stress corrosionC) centralized corrosion

ii) Differential metal corrosion isA) galvanic corrosion' C) stress corrosion

A) electroplatingC) electrophoreting

iiD Addition of buffer to the plating bath is toA) increase the pH of the bathC) control the pH of the bath

2of4

B) differential aeration corrosionD) all of these

B) differential aeration corrosionD) pitting conosion

B) electroless platingD) electropolishing

B) decrease the pH of the bathD) none ofthese

06c}IEl2l22

5 a. iv) In electroplating of chromium, inert anode is used in place of chromium becauseA) wide difference between anode and cathode efficienciesB) imbalance of the bath composition with respect to C(trI) and Cr(VDC) to avoid poor quality depositionD) all of these

Explain the decomposition potential and over-voltage.Explain the role ofthe following factors on the nature ofelectro deposit :

i) Current densityiD Throwing powerExplain the electroless plating of copper.

Choose the correct answers for the following :

i) Para Azoxy Anisole is an example forA) nematic B) smectic C) chiral nematic D) c

ii) Which of the following is a lyotropic liquid crystal?

b.c,

d.

6^.

(04 Marks)


iii) Which of the following is a reference electrode?

A) para azoxy anisoleC) cholesteryl benzoate

A) glass electrodeC) platinum electrode

B) para azoxy phenetoleD) soap-water mixture

B) calomel electrodeD) none of these

(06 Marks)the colorimetric estimation of copper using

(06 Marks)

iv) Calorimetry involves the measurement of absorbance using monochromatic light in theA) visible range B) IR range C) UV range D) all of these

b. Explain with suitable examples the liquid crystalline behaviour in homologues of PAA.((N Marks)

c. Explain the molecular ordering in the following liquid crystal phases :

i) Nematic phase

ii) Chiral nematic phased. State Lambert's law and Beer's law. Explain

NH3 as the complexing agent.

7 a. Choose the correct answers for the following :

i) The emulsion polymerization of chloroprene givesA) butyl rubber B) epoxy resin

ii) Te polymer having highest Tg isC) neoprene rubber D) styrene

A) polypropylene B) polyethylene C) pvciii) The monomer ethylene is

D) polystyrene

A) monofunctional B) bifunctional C) trifunctional D) poly functionaliv) Which of the following polymer is used as substitute for glass?

A) teflon B) pollurethane C) PMMA D)PVCb. Explain the free radical mechanism of addition polymerization taking ethylene as an

example. ((X Marks)Give the synthesis and applications ofthe following :

i) PMMAii) Butyl rubberiii) Teflon

Give the structure and applications of conducting polyaniline.

(M Marks)


(04 Mart<s)

C.

3of4

06cIJEt2l22

(M Mar&s)8 a. Choose the correct answers for the following :

i) Temporary hardness of water is caused due to the presence ofA) MgC/z B) Ca(HCOr2

ii) The secondary treatment of sewage involvesA) biological treatmentC) chemical treatment

iii) The method used for desalination of water isA) lime-soda process

C) flash evaporation

A) Winkler's methodC) PDA method

C) CaCO: D) all of these

B) physical treatmentD) all of these

B) permutit processD) ion-exchange process

iv) Which of the following method is used for the estimation of chloride content in water

b. 100 ml of water sample required 4 ml of N/50 HzSOr for neutralization to phenolphthaleinend point. Another 15 ml of the same acid was needed for further titration to methyl orange

end point. Determine the type and amount of alkalinity. (04 Marks)c. Explain Winkler method of determining dissolved oxygen. Give the reaction involved.

d. What is potable water? Give thewater by reverse osmosis process.

B) argentometric methodD) SPADNS method

(06 Marks)characteristics of potable water. Explain desalination of

(06 Marks)

4of4

Second Semester B.E. Degree Examination, Julne 2012

Engineering Mathematics - lI

O6MAT21

Max. Marks:100

(04 Marks)

D) none of these

D) p'

D) rl2


(04 Marts)

b.

d.

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!=gE6.d

6.4

6s\J<-i ..i

z

E

Time: 3 hrs.

Note: 1. An swer any FIVE full questions, choosing at lcast two from each part'Z Answer ali objectiie typi questions only on OMR sheet page 5 of the answer booklet.

3. Answer to objective type questions on sheets other than oMR will not be valued.

PART - A

I a. Choose your answers for the following :

i) The radius of curvature at a point (r,0) ofr = aee"otois

A) rcoseccr B) cosecsiD The radius ofthe circle of curvature is

B)l

A) 0.r25 B) 0.523

p

The value ofC ofthe Lagrange's mean value theorem for f(x) = tan'rx in [0, I ]

C) cotcr

c)p

iv) Maclaurin's series expansion of sinx is

xl x'A) x--+-........3! 5!

ct *+{+..........3!

A)l

oA):0

C) n/4

sl r-L*d+.........2l 3!2

Dt I +x +L+..........2

2a.

Find the radius of curvature for the curve y = a log sec (x/a) at any point (x' y)'

State and prove Lagrange's mean value theorem.

Expand e"i*, using-MaJaurin's series upto the term containing xa.


i) Lim *. (+) logx is equal to\2x) -

A) nlZ B)2lnii) The basic fundamental indeterminate forms are

c)n D) nl3

C) both A and B D) none oftheseB)900

iii) Find the critical point of the function f(x, y) = $in1 '''- Siny + Sin(x + y) is

B) (x13, rl3) C) (n12, nl2) D) none of these

b.

A) (1.l)iv) In a plane triangle ABC, the maximum value of COSA'COSB 'COSC is

A) 314 B) 3/8 c) I /8 D) 5/8

limEvaluate (2xtanx - Trsecx). (04 Martrs)x-+ nl2

Expand eo* sin by in powers of x and y as far as tetms of 3'd degree. (06 Mar'ks)

show rhat the maximum value of xv*u'fl*1) ir:u'' (06 Marks)' (x Y)I of 4

c.

d.


2ti) Jf x + y;Oxdy is equal to

A; r2h Br ?*,

iii) The value of B(m, n) is

nt i*"(l - xln-rdx,J0

I

cr fx'-'rl - x)'-rdx')0

b.

c.

00

A)3 B)4 c)sii) The volume ofthe cylinder with base radius 'a' and height 'h' is

(04 Marks)

D) none of these

D) none of thesec)#h

I

n1 Jx'-'1t-x1.dx0

D) none of these

iv) Ii n is a positive integer, then I n + t ;s equal to

+) "F s)(n- l) FrCalculate by double integration the volumer = a (1 - Cos 0) about its axis.

r.--i I:-,1--1l ll-x- 1,lr ^ -y

evaluate [ [ [ xyz dxdydz.J)000

"l?

-

nl?. I

d. Show trrat JJsine ae * j ,g6-oe = ^


i) F is said to be solenoidal, if

A) Gauss theoremC) Baye's theorem

c), F+rgenerated by the

D) n!

revolution of the cardioid(04 Marks)

(06 Marks)

(06 Marks)

(04 Mar*s)

e) JFol=o n)JFxdi=0 c)Fxi=0 D)noneofthese

ii) If F = 3xyi + yJ and C is the curve, in the xy-plane, y = *'f.o. (0, 0) to (1, t), then

Jr*a.i*A) Constant B) Variable C) zero D) none of these

iii) Green's theorem in the plane is a special case ofB) Euler's theoremD) Stoke's theorem.

iv) Stoke's theorem is a relation betweenA) a line integral and a surface integral B) a surface and volume integralC) two volume integrals D) a line and volume integral.

b' Ir F = 3xyi - y'zj , evaluate JF.ar unng ftre curve y = 2x2 in the xy-plane from (0, 0) toc

(1 ,2). (04 Ma*s)C.

Evaluate, by Green's theorem, [(*y * y') dx + x2dy, where Cd"

Y = x2.Prove ttrat the cylindrical co-ordinates system is orthogonal.

isboundedbyy=xand

d.(06 Marks)(06 Marks) .

2of4

PART -B5 a. Choose your answers lor the following :

i) solution ofthe differential equation (D2 + a2) y = 0 is

O6MAT21

(04 Marks)

A) Cre'* + Cze-"*

C) (Cr + Czx) Cos axB) Cr Cosax + Cz SinaxD) None of these

iD P.I. ofthe differential equation (D2+ 3D + 2) y = s- ig

er je. Br 1e-3

c) .9.:'2

h.


i) Tlie Wronskin of e* and e-* isA) 2 B)-l C)0

ii) To transform (ax + 1)2 y" + (ax + 1) y' + y = $(x) intocoefficients, put t =A) logx B) log (ax + 1) C) e'

c) (1, 1,2) D) (-r , -1, 2)

B) (crx + c2) e-*

D) (cr Cosx + cz Sinx)(04 Marks)

(06 Mar*s)

(04 Marks)

D) -2a L.D.E with constant

D)x

C) 3 Sin5t D) none ofthese

Cf iri .:F]."i:*

Li iu ii,,,i..l y

c-

d.

iii) The roots of the A.E with differential equation (D3 + 2D2 -D -2)y =0 areA) (1, r, -2) B) (-1, 1, -2)

iv) C.F of (D2 + l) y = x3 isA) (c1 + c2 x) e*

C) (cr Cosx + cz Sinx) e*Solve(D3+ l)y=e-.

sorr" 4+S= x2 +2x+4.

Solve by the method of undetermined co+fficients the equation y" + 4y = x2 + e'*. 106 Marks;

iii) Solve the initial value problem x" + 4x' + 29 x = O satisfuing the conditions x(0) = 0,

x'(0)= ls isA) e'' (3 sin50 B) 3e-2t

iv) (C1 + Czx) e* is the general solution ofA) (D"+ l)'y = 0c) (D'-1)Y=0

b. 561u" *' i'Y--*9*r=,or*.- dx' dx

D)

iii)

6c)+s'

c. Solve #-r*., = {, by trre method of variation of


i) Laplace transform of te-tSint is

er ,2('-l) , 91 --ll-l-(s'+s+l)' (s'-s+l)'ii) Laplace transform of Sin 3t is

d. Solve the initial value problem d? *a9*5y*2Coshx =0, giveny=

A) -j-s'+9Laplace transform of fO is

A) s f(s) - f(0) B) s f(s) + f(0)Laplace transform of t3 is equal to

1tA) ;

s-

B)l-s'+9

6B)i

^ s+lu)- _(s'-s+2)'

C) -Ls'-9

c)sf(0)-f'(0)

D) e*

2(s + l)(s2 +2s+2)'?

ID) ___l

s'-9

D)sf'(0)-f(0)

5D)+s'

o.9I=r atx=0.'dx(06 Marks)

(04 Marks)

iv)

3 of 4

b.

c.

Find L.T of e2t Cos2t.

If f(t) is a periodic tunction of period 'T', then show tfrat L{ f (t) }= a!

C) Coshat

C)n= I, 2, .....

O6MAT21

(04 Mart<s)T

Je*'r1t;at.0

(06 Mafts)

(06 Marts)

(04 Marhs)

D)n< 1.

(M Marts)

(06 Mar*s)

(06 Mar*s)

[--ar --tr Id. Find r..l " " l.l.r)8 a. Choose your answers for the following I

i) Inverse Laplace transform of -o-1 , is

-. CosatA)-a

ii) Inverse Laplace transform or ,-!]] ,^ is

A) e-2r Cos3t + 1." Si, 3t'3c) e2tsin3t -J .'c*rt

iii) hverse Laplace transform of ffi tt

A) ltcosat g) It sinat'2a2ai"r r;lf] is oossible onlv when n is' [s"J

A) n> I B)n>- I

Findrh. r,{s'-?'+l}.Is')Find r,{ =3'+7 }.[s'-2s - 3J

B; e2' sin3t + 1 e-2t cos3t

^. a^-D) e" Cos3t + - e'' Sin3t

C) t Cos2at. D) ! Sinut

B) Sinat D) sinhla

b.

c.

d. Applying L.T method, solve x" - 2x' + x = e2 given that x(0) = 0 and x'(0) = -l.

!&**{.{c

4of4

USN

10ccP13/23


(04 Marks)

D) Record

D) DOS

D) FIoPPY disk

D) Communication

b.

c.

d.

E

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o

FirsUsecond Semester B'E' Degree Examination ' June20l2

Gomputer Goncepts and 'Gt Programming

Time: 3 hrs. Max' Marks:100

Note: 1. Answer any FIVE full questions' choosing at least two 'from each part'

2. Answer au obi""rrrl:;;;;;;"d,1""''"ii.":" otuti ,n'uipog" s of lhe answer booktet'

3. Answer to objective We questions on she"ts oth"i than'Oiln will not be valued'

I a. Choose your answers for the following ' -, ---r^^ D^LL-da -,o. netlerl (04 Marks)

i) The iin,t ."tttunili^"clrnp*tt a?'ig*d by Charles Babbage was called

A) Abacus B) Processor

c).calcurator ') ol:'*:*::F*",..,,,".*

PART-A

Discuss the basic structure of a computer with a neat block diagram'

i*pf." Oiff"t"n tlpes of computers for organizations'

Choose vour answers for the following :

i) A collection of4 bits is called'' aitlitur" B) B)'te c) w^ord

ir) $/hich of the operating svslem is not a GUI based'/

el wNoows^ -el"l-tNUX c) MAC

iii,) Which is a secondary memory device? ^\ D^^:

A) Cache B) RAM C)- Regtsters

irl 'whiJ

"i the following is not a layer in the osl model?

' A) Presentation i) T'untpott C) Session

iu ',;,*;,.d.;.rit was developed in ...=-- generation of computers

^ \ DrDcr.

I vlrvvvs --'....=--s) s'EcoNp ,:r,aA) FIRSr :{:'^Y,Y';: ,/,.{P:Ajir'ii; D)FouRrH ":iZ \i;ii\'s/ \ i-r

/r:a \ i. ad"i\/^lenl to ,.-/ --..*.-.^ ':iii) I Gigabye (CB t is equivalent to ._- vD i .:/ Ces'ri:r.l- ir ,

^ \ rn.,.r N,{Er B) 1024 KB ll oi ii,""i".,,. lifA) l024MB :/,.':^-;-.j" i\ j! usru:,nv 1i;.'

c) l024CB D) l024TB \,1\iv) e!c[ l, a ,__.- bit BCD code t$

A)4c)s D)lo

\l.".\_"4ifB) 6 ".*ltq.V

b.c.

2a.

Enlist various secondary storage devices' Explain how data can be stored and retrieved from

CD-ROM. (06 Marks)

what is an operating system? what are the major functions of an operating tyttt*?,ou ,u.u.)

cE$:Yi?,ij,i-LI SRA}IY

Write a note on the need for networking'

I of 4

(04 Marks)

?


i) 'C' language is aA) Structured languageC) Machine language

ii) Identify valid identifierA) al23C) 123a

iii) A step by step procedure to solve a given problem is called

t0ccPt3t23

(04 Marks)

B) Object-oriented languageD) Assembly language

B) $123D) a#123

B) AlgorithmD) Program

B) -128 to 127D) -127 to 127

(06 Marks)

(04 Marks)

A) LogarithmC) Flowchart

iv) The range ofchar data lypes on l6 bit machines is:A) -l26to 127C) -127 to 128

b. Explain the different phases of solving a given problem using computer. (10 Marks)c. Write an algorithm and flowchart to calculate factorial of a number.


i) The operator Vo yieldsA)' Quotient B) RemainderC) Percentage D) Fractional part

ii) Evaluate the expression l0! = l0llS . +AAA. The resulr is:A)l B)0 c)2 D) 10

iii) Which of the following bitwise operator shifts their frst operand to its left?A) && B) << C) >> D)n

iv) Ifa = 10, b = 5 find C = ++a-b. The result is:A)5 B)7 C)6 D)-6

b. Explain precedence and associativity of operators in 'C' with an example. (08 Marks)c. What is type conversion? What are the different ways of type conversion? Explain with an

example. (08 Marks)

PART - R5 a. Choose your answers for the following : (04 Marks)

i) What is the output of following program?#include <stdio.h>Void main( ){ int num;

for(num = 0; num <= l0; num ++){;

)printf("7od", num);

)A) 012345678910 B) 11

c) l0 D) 01234567891011i0 A for loop with no test condition is known as _ loop

A) Finite B) Infinite C) While D) do-whileiii) In 'C' which of the following is not a storage class specifier?

A) Static B) Auto C) Const D) Registeriv) Which of the following is the last character that is stored in a char array in .C,?

B) U{ULL C) 0A) \0

2of4

D) /0

I

o6ccPt3l23

Max. Marks:100

PART - A(04 Marks)

can be plugged into one of these devices which gives the

(D) docking station

(D) CNTRL

(D) centimeters

First/Second Semester B.E. Degree Examination, June2O1.2

o.

.L

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5oJ

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Time: 3 hrs.

1 a. Choose the correct answer :

i) Some notebook systems

Gomputer Goncepts and G - Programming

Note:/. Azswer FIVE full questions choosing at least two from each part',

2. Answer all objictive type questions oily on oMR sheet page 5 of the Answer Booklet.

3. Answers to objective $pe questions on sheets other than oMR will not be valaed.

computer additional features(A) port station (B) network station (C) work station

ii) Which of the following is not a modifier key :

b. Briefly explain the computers used in organisations'

c. Explain with a diagram how a keyboard communicates with the computer'

d. Briefly explain the information processing cycle.


i) A computer system that uses a smaller instruction set is said to use technology'

(A) CIS. (B) RISC (C) MISC (D) DISC

ii) Which of the following is a common drive interface standard used in PC's?

(A) ETC (B) QWERTY (C) EIDE (D) IOU

iii) Each side of a standard DVD - ROM disc can hold upto

-

of 9ata, . - --(A) 4.7 GB (B) 9.4 GB (c) 17 GB (D) 140 GB

iv) Flash memory is an example of storage device'(A) Magnetic (B) Optical (C) Solid - state (D) None of these

b. What is machine cycle? Briefly explain the parts of a machine cycle' (06 Marks)

c. Briefly describe thl areas that are created on a disk when it is formatted with FAT file

ii) A

-

is an agreed upon format for transmitting data between the devices'

(A) protopology (B) protoplasm (C) prototype (D) protocol

iii) A is a computer that stores and forwards email messages'

(A) mail server (B) mail center (C) mail system (D) mail box

network all devices are connected to a device called hub and

communicate through it.(A) bus (B) star

(A) shift (B) backspace (C) ALTiii) The refresh rate of a monitor is measured in(A) b),tes (B) birs (C) hefiz

iv) The term dots per inch (dpi) refers to a printer's

-

(A) speed (B) resolution (C) outPut

sYstem.d. What is average access time? How it is measured?


i) An operating system is an example of

-

software.(A) utility (B) application (C) sYstem

iv) In a

(C) ringlof3

(D) color(06 Marks)(06 Marks)(04 Marks)

(04 Marks)


(04 Marks)

(D) none of these

(D) mesh

,.Iiliff1(0E Marks)

(04 Marks)

(D) int

b.c.

4a.

Describe the four primary functions of an operating system.Explain the uses of networking the computers.

Choose the correct answer :

i) Which of the following is a valid variable name(A) nl + n2 (B) doubles (C) 3'd placeii) What would be the value of x after execution of the following segment?

int x,y - l0 ; charz='q' ; x-y+z-'p';'(A) 110 (B) l1l (C) l0 (D) none oftheseiiD In a flowchart, a parallelogram symbol is used for(A) input (B) output (C) input/outpur (D) none of theseiv) Which of the following symbol does not belong to the C character set?(A) ^ caret (B) _ underscore (C) I exclamation (D) @ ar the rate

b. i) Write the equivalent C statement fo. f = 2llt2^ g

ml l- mlii) Rewrite the following expression after removing unnecessary parenthesis :

(( x - (y/5) +z)Vo8) +25iii) What is the value of the expression -147o3?iv) If x = 4 initially, what is the value of x after the following statement is executed :

x =.x + + :

v) How many relational operators are supported by C?vi) What is the complement of the relational expression !(x! = y)?

c. Define flowchart and algorithm. Write flowcha( and algorithm to find factorial of a given(06 Marks)

(10 Marks)

(04 Marks)

(D) x=2,y=4.(06 Marks)(10 Marks)

(04 Marks)

integer.

a. Choose the corect answer :

PART - B

(A)iv)

i) If the number 98.7654 is to be printed as 9.88e + 0l h h using printf statement ( ..b isblank), the control string must be set to _.

(A) Vo -10.2e (B) 7o -'7.2f (C) o/o e (D) Ea tii) By default the real numbers are pdnted with a precision of _ decimal places.(A) 4 (B) 5 (c) 6 (D) 8iii) The temary conditional expression using operator '?' could be easily coded using

statement.simple if (B) if - else (C) while (D) else - if ladderFind the value of x and y after the following segment is executed assuming n = 0 :

intx=l,y=l;if(n>0)

x=x+1;v=v-1;

print f ("Vo d 7o" , x, y) ;

(A) x= I,y= | (B) x=l,y=a (C) x=0,y=aExplain formatted output with an example.Explain switch statement with an example.


i) Find out how many times the following loop is executed?intm=10,n=7;While (m Vo n> =O)

{m=m+ I ;

n=n+2 t

)

b.c.

6a.

(c) 02 of3

(A) 5 (B) 4 (D) infinite

(c) nIn the following program segment, the print f statement is executedtimes.

intm=l,n=0;for( ; m + n < l0 ; m + +, n + +);

print f ("Vo d", m x n);(A) s (B) 6 (c) I (D) 0

b. Write a program to read a positive integer and print the sum of its digits, using a suitableentry controlled loop.Differentiate between while and do - while loop.Write a program to find whether the given integer is prime or not.


i) In an 'n' element array, the nth element will be stored at the index

-.(A) n (B) n+ I (C) n- 1 (D) None of theseii) _ is the process of arranging the elements ofan array in order.(A) searching (B) sorting (C) keying (D) scanning

(D) Derivediii) An array belongs to the _ data type.(A) Fundamental (B) Primary (C) Userdefinediv) An array is a size sequenced collection of elements of the data tlpe.(A) variable, same (B) variable, different (C) fixed, same (D) fixed, differentExplain how 1 - D arrays are declared and initialized. (04 Marks)Write a C program to read a N x N matrix and find the sum of elements of each of its

(A)iv)

ii) Which of the following can be configured as a sentinel controlled loop?(A) while loop (B) do - while loop (C) for loop (D) all the three loopsiii) In an exit controlled loop, if the body is executed 'n' times, the test condition is

evaluated _ times.n+l (B) n-l

number of


(04 Marks)

diagonals.Write a C program to implement linear search.


i) The parameters used in a function call are called as _ parameters.


(04 Marks)

(A) format (B) informal (C) virtual (D) actualii) Specifying parameter names in a function prototype is(A) compulsory (B) optional (C) illegal (D) none of theseiii) What will be the value of the function call divide (4.5, 1.5) to the following function :

divide (float x, float y){

retum (x/y) ;

](A) 3.0 (B) 3 (c) 0.333333 (D) 0iv) A variable declared inside a function is called _ variable.(A) local (B) global (C) extemal (D) actualWhat is the need for user defined functions? (04 Marks)List and explain the parts of a function body. (06 Marks)Write a C function which accepts a two dimensional matrix as a parameter and returns thelargest element of the matrix. (06 Marks)

*****3 of 3

(D) ,2

c.d.

b.

d.

a.

b.c.d.

26rc5n}12- 2.30Pm to 5'30Pm

USN 10cED14124

First I Second Semester Degree Examination, MaY / June 2012

COMPUTER AIDED ENGINEERING DRAWING

Time: 3 Hours (coMMoN TO ALt BRANCHES) Max. Marks:100

Note: l.Answer three full questions

3. Draw to actual scale

Use A4 sheets suPPlied

Missing data, if any, may be suitably assumed

Ql. i) A point P is l5mrn above HP and 25mm in front of vP. Another point Q is 25mrn

behind VP and 40mm below HP. Draw their projections when the distance betwccn

their projectors parallel to the X-Y line is zero mm. Add the right side view olpoint Qonly. I t0 Marks]

ii) The top view of a 75mm long tine AB, measures 65mrn while the front view is 50mm.

It's one end A is in the HP and l2mm in front of the VP. Draw the projections of ABarrd detennine its inclination with HP and the VP. [20 Marks]

development of the funnel. [30 Marks]

OR

Ql. A rectangular lamina of 35mm X 20mm rests on HP on one of its shorter edges. The

larnina is rotated about the edge on which it rests till it appears as a square in the top

view. The edge on which the lamina rests is inclined at 30o to VP. Draw its projections

and find its iiclination with HP. [30 Marks]

e2. A hexagonal pyramid 25mm sides of base and 50mm axis length rests on HP on one of its

Slant eJg"s. Dru* the projections of the pyramid when the axis is inclined at 45o to VP'

[40 Marksl

Q3. A funnel is to be made of sheet metal. The funnel tapers frorn 40mm to 2Otntn diameterto

a height of 20mm and from 20mm to 15mm diameter for the next 20mm height. The

bottom of the funnel is beveled offto a plane inclined at 45o to the axis. Draw the

OR

Q3. A rectangular pyramid of base 40rnm X 25mrn and height 50mm is centrally placed on a

cylindrical slab of diameter t00mm and thickness 30mm. Draw the isometric projection

oithe combination of solids. [30 Marks]

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06ELN1s/25

3 a, Choose your answers for the following : (04 Marks)i) The process of making operating point independent of temperature changes or

variations in transistor parameters is known as

ii) The intersection of the dc load line with given base current curve is the

A) BiasingC) Thermal runaway

A) h-pointC) Q-point

iD The unit of transconductance gm of an FET isA) volts/ampereC) ampere/volts

B) StabilizationD) None of these

B) D-pointD) None of these

current.B) BaseD) Both base and emitter.

B) 0.7VD) None of these

iii) Lower stability factors imply lower variation in theA) CollectorC) Emitter

b.

t8oraRr

S 6KvuRz

Fig. Q3 (c)


i) FET is a controlled deviceA) VoltageC) Pulse

iv) To forward bias the base to emitter junction, the minimum Vss required isfor Si transistor.A) 4Yc) 0.007v

Define stability factor. Discuss the factors that cause instability of biasing circuits.

For the'circuit shown in Fig. Q3 (c), determine 16, Ve, Vs and V6s.

+2 \V(08 Marks)(08 Ma*s)

(04 Marks)

e"8'L<"si \rqn sistsr

I .-\ \<.,r-

B) CurrentD) Power

B) voltsD) None of these

B) more thanD) none of these

B) lowD) none of these

iii) Latching cunent in SCR is _ holding cunent.A) less thanC) equal to

iv) JFET has _ input impedance.A) highC) very low

b.c.

Draw the two transistor equivalent of an SCR and explain working of SCR. (08 Ma*s)Draw the Vl-characteristic and equivalent circuit ofUJT. Explain how UJT can be used as arelaxation oscillator.

2of4

(0E Marks)

PART - B


A) Remains constantC) Increases

A) ' Remains constantC) Variable

6a.

A) CommonC) Difference

A) VoltsC) pV/V

(04 Marks)i) The magnitude voltage gain at half power frequencies of an RC-coupled amplifier is

times maximum voltage gainA) O.7O7

c) r0ii) With negative feedback, output impedance ofan voltage series feedback

B) 7.O'7

D) 17.06

iii) Without bypass capacitor across Re, the voltage gainA) decreasesC) constant

B) DecreasesD) None of these

B) increasesD) none of these

B) DecreasesD) None of these

B) MixedD) None.

Horizontal lineNone

B) AmperesD) None

(06 Marks)amplifier and explain it. Mention its

(10 Marks)

(04 Marks)

iv) The magnitude of product of open loop gain (A) and feedback factor (B) is less thanone, then the output voltage

-

with fiequency.

b. A crystal has L= 0.33 H, C =0.06 pF, R=5 KO and C.= 1 PF. Findi) Series resonant frequencyii) Parallel resonant flequencyDraw the frequency response of an RC-coupledadvantages and disadvantages


i) If the different input signal is applied to the two inputs ofop-amp, then mode is

iD If a sinusoidal voltage is applied to vertical deflection plates only, then we get

on the screen of the CRO.A) Vertical lineC) Both linesThe unit of PSRR is

B)D)

iii)

iv) Maximum rate of change of output voltage with time is calledA) CMRR B) Slew rateC) Over rate D) None

b. Define the following terms with respect to op-amp:i) CMRRii) Input offset voltageiiD Input offset currentiv) Input bias current (08 Marks)

c. Draw the three input non-inverting summer circuit using an op-amp and derive an

expression for output voltage. (08 Mar&s)

3of4


i) (ABC.D)16 = L_)roA) 2748.8125c) 2640.2

ii) (934)10= C-_)sA) 1600c) 1641

iii) (11001.r 10) = (__)roA) 24.75c) 40.26

iv) 2's complement of (1001 1)isA) 01 101

c) 01 111

b. Draw the block diagram of a superhetrodyne receiver and explain the functions of eachblock. (08 Marks)

c. The total power content of an AM wave is 2.64 kW at a modulation factor of 8OVa.Determine the power content oti) Carrier ii) Each side band

d. Subtract using 2's complement of [78-65].


i) The NAND-gate is AND-gate followed byA) OR gate

C) EX-NOR gateiD A+(B+C) = (A+B)+C is _law.

A) AssociativeC) Distributive

iii) A+AB=A) A+A

' C) A+Biv) The output is high, when both inputs are not equal, such a gate is called

B) 2741.81D) 3641.25

B) t646D) t644

B) 20.75D) 25.75

B) 01110D) 11111

B) EX-OR gateD) NOT gate

B) CommutativeD) None

B)AD) None

B) NOT gateD) None

06ELN15/2s

(04 Marks)


(M Marks)

(0E Marks)

(08 Marfts)

A) EX - OR gate

C) EX - NOR gateb. Design a full adder circuit and rcalize, using two half adders.c. Simplify the following Boolean expressions and implement using only NAND-gates:

i) y=eBC+nsc+AB+eCii) y =A(ABC+ABC)

{.**r<,k

4of4

06crv18/28

Question Paper Version : C

1.

t

3.

4.

5.

First/Second Semester B.E Degree Examination.- June 2012Environmental Studies

(coMMoN TO ALL BRANCHES)

Time: 2 hrs.l

INS:TRACTIONS TO THE CANDIDATES

Answer all the fifty questions, each question carries ONE mark.

Use only Black ball point pen for writing / darkening the circles.

For each question, after selecting your answer, darken the appropriate circle

corresponding to the same question number on the OMR sheet.

Darkening two circles for the same question makes the answer invalid.

Damaging/overwriting, using whiteners on the OMR sheets are strictly

prohibited.

2. Population explosion will causea) Bio-diversityc) More employment

a) Reducing fossil fuel consumptionc) Deforestation

3. Which of the following is not a solution for global warming?

1. An altemative eco-friendly fuel for automobiles isa) Petrol b) Diesel c) CNG d) Kerosene

b) Stress on ecosystemd) None of these.

b) Planting more treesd) None of these.

b) Energy crisesd) All of these.

b) Increase in sea leveld) All of these.

b) Reducing oxygen emissionsd) Increasing the forest cover

4, The first of the major environmental protection act to be promulgated in India wasa) Air act b) Water act c) Environmental act d) Noise pollution act

Population explosion will causea) Socio-economic problemsc) Food scarcity

Global warming could affecta) Climatec) Melting of glaciers

Acid rain can be controlled bya) Reducing S02 and NO2 emissionc) Increasing number of lakes

6.

7.

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06crv18/288. The pH value ofthe acid rain water is

a) 5.7 b) 7.0 c) 8.5 d) 7.5

9. Major compound responsible for the destruction of stratospheric ozone layer isa) Oxygen b) CFC c) Carbon dioxide d) Methane

10. Domesticated animals are used fora) Dairy products b) Production offiber c) Production ofmeat d)All ofthese.

11. World ozone day is being celebrated ona) September 5rh b) October 5m c) September 166 d) September I lth

12. Bhopal gas tragedy was due to the leakage ofa) Methyl isocynate (MIC) b) Sulphur dioxidec) Mustard gas d) Methane

13. The forest (conservation) Act was enacted in the yeara) 1986 b')1974 c) 1980 d) t972

14, The leader of Chipko movement isa) Medha Patkar b) Sunderlal Bahuguna c) Vandana Shiva d) Suresh Heblikar

15. An intemational conference on environmental education was held in December 1982 ata) Kyoto b) Vienna c) New Delhi d) London

16. The world environmental day is celebrated ona) June 5u b) November 5th c) April 5ih d) December 5th

17. India has the world's largest share ofa) Manganese b) Copper c) Mica d) Diamond

18. The hydrological cycle is related toa) Water cycle and balance b) Water and electricityc) Hydropower d) Water characterization

19. . An important NGO involved in global environmental prot€ction isa) UNICEF b) Green peace c) WHO d) CPCB

20. About 3/4th of the country's coal deposits are found ina) Kamataka b) Tamil Nadu c) Kashmir d) B ihar & Orissa

21. Which of the following is a biotic component of an ecosystem?a) Fungi b) Solar light c) Temperature d) Humidity

22. h an ecosystem, the flow ofenergy isa) Bidircctional b) Cyclic c) Unidirectional d) Multidirectional

23. The first Intemational Earth Summit was held ata) Johannesburg b) Rio-de Janerio c) Kyoto d) Stockholm

24. ISO 14000 standards deal witha) pollution management b) environmental managementc) risk management d) None ofthese.

25. The major atmospheric gas layer in stratosphere isa) Hydrogen b) Carbon dioxide c) Ozone d) Helium.

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27.

28.

30.

31.

06crv18/28Which ofthe following is not the environmental effect of industrialization, in general?a) Solid waste b) Water pollution c) Economic growth d) Air pollution.

EIA can be expanded as

a) Environment and Industrial Actc) EnvironmenLally lmportanr Acrivity

The impact of construction of dams isa) submerged forestsc) damages down stream ecosystem

29. Among the fiesh water available on the Earth, the percentage of surface water is abouta) 5O Vo b) lO 7o c)5 Vo d) less than l7o.

Major sources of fluoride isa) Ground water b) Toothpaste c) River water d) Food products

Bluebaby syndrome (methaemoglobinemia) is caused by the contamination of water duetoa) Phosphates b) Sulphur c) Nitrates d) Arsenic

d)u-24532. The most important fuel used by nuclear power plant is

a) u-235 b) u-248 c) U-238

33. Bacteriological pollution of water is due to the presence ofa) silt and gritc) suspended particals

34. Lead poisoning may causea) reduction in haemoglobinc) mental retardation

a) electrostatic precipitatori) catalytic converter

35. Air pollution from automobiles can be controlled by fitting

b) Environment and Impact Activitiesd) Environmental Impact Assessment.

b) loss of wild life habitatd) All of these.

b) parasitic wormsd) floating materials.

b) kidney damaged) all of these.

b) wet scrubberd) all of these.

36. Which of the following are non-biodegradable?a) Plastics b) Domestic sewage c) Detergents d) Both a and c

Which of the following is a secondary air pollutant?a) Carbon monoxide b) Sulphur dioxide c) Ozone

In which year, the Hon'ble Supreme Court of krdia madecompulsory subiect at all the levels ofeducation?

37.

38.

d) Carbon dioxide.

environmental education

d) 2003a) 2000 b) 2001 c)2002

39. Environmental protection is a fundamental duty of the citizen of India under the articlea) s l -A(8) b) 48-A c) 47 d)21

40. Ozone layer is present ina) Stratosphere b) Mesosphere c) Thermosphere d) Troposphere

41, Chemobyl nuclear disaster occurred in the yeara) 1984 b) 19s2

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c) 1986 d) r987

T

42. Which of the following is not a renewable source of energy?

a) Wind energy b) Tidal wave energy c) Solar energy

43. Electromagnetic radiation can cause

a) Plague b) Malaria c) Cancer

c) Raichur44. Nuclear power plant in Kamataka is located at

a) Bhardravathi b) Sandur

45. Which place in India, the tidal energy has been experimented?b) Kamataka c) Kerala

c) Water

06cIv18/28

d) Fossil fuels.

d) Dengue fever.

d) Kaiga

d) Tamil Nadu

d) Solar energy

d) both a and b

d) 150 dB

d) Cadmium.

47.

48.

a) Goa

46, In hydro power plants, power is generated bya) Hot springs b) Wind

Environmental pollution is due toa) rapid urbanization b) deforestation c) afforestation

Definitibn of noise is

a) Loud sound b) Unwanted sound c) constant sound d) Sound of high frequency

49. Sound, beyond which of the following level, can be regarded as a pollutant?a) 40 dB b) 80 dB c) 120 dB

c) Mercury50. 'Minamata disease' is caused by

a) Lead b) Arsenic

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chemisty stream (2012-july) question papers

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