nstc 7 sample paper 02009 11 v1

8/13/2019 NSTC 7 Sample Paper 02009 11 V1

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7thNational Science Talent Contest (NSTC-7): Sample Paper 2009-2011

Maximum Marks: 100 Maximum Time: 3 hours

1. Part Ihas 5 multiple-choice questions from each of the four disciplines of the competition and all thecandidates are expected to attempt this part. It carries 0 marks! The multiple-choice portion of the

relevant section of Part II carries "0 Marks. orrect ans!er !ill carr" #1mar#$ 1$3mar# !ill %e

deducted for each incorrect ans!er.

2. To ans!er Part I& and the multiple-choice portion of the relevant section of Part IIdetach the pa'esentitled (%ns&er Sheet 'or Part I an %ns&er sheet 'or Part II . )rite "our name on the space

provided in these sheets. There are four choices *a& %& c& d+ correspondin' to each multiple-choice

question. olor one of these choices as sho!n in the example& !hich in "our opinion is correct. If "ou!ant to chan'e the ans!er& "ou ma" do so after crossin' out the previous ans!er. ,ou'h !or# ma" %e

done in the %ns&er *ookletfor Part II%" clearl" specif"in' (,ou'h )or#.

. The descriptive question*s+ ofPart II should %e solved in the %ns&er *ooklet for Part II! This

*these+ questioncarries 30 Marks.

/. The last pa'e !ill provide "ou the opportunit" to 'ive fran# opinion a%out the test and is meant tomotivate "ou to carefull" read the question paper %efore attemptin' it. It !ill %e used to discriminate

%et!een candidates havin' similar scores. Students !ill %e short-listed for a one-!ee# Trainin' amp

in ul"& u'ust or Septem%er on the %asis of their performance in this screenin' test. Please ma#e surethat !e have "our phonefax num%er andor e-mail address on !hich "ou can %e informed a%out the

result in a%out one month.

5. ,ecommended time for Part I is 30-+0 minutes and for the multiple-choice portion of Part II and its

descriptive portion isa,out one hour each. The rest of time is for readin' and commentin'.

3. Noleaf from the question paper or ns!er 4oo#let is to %e torn out and these must %e handed over tothe examiner& even if no question has %een attempted. n" one found usin' unfair means !ould %e

disqualified.

. 6ou ma" use scienti'iccalculators.

7. Noquestions !ill %e entertained and no clarification !ill %e made durin' the test. In case of dou%t&

please !rite do!n "our remar#s alon' !ith "our comments.

9. 6ou must attempt Part I andonl one of the relevant portions ofPart II& %ecause to qualif" screenin'

test one should pass %oth Part Iand the portion of Part II that is relevant to the discipline in !hich "ou

!ish to compete.

10. The term (estimate if used in the descriptive portion of Part II means that onl" an approximate ans!eris expected from the students. Similarl" the term (s#etch in this Part means dra!in' a rou'h 'raph&

!hich loo#s li#e !hat "ou mi'ht expect from more careful considerations.

11. Please put "our .en o&nas soon as "ou hear sto.!ritin'.

1

Check /ist:

Paper contains 2 pa'es includin' this pa'e and no pa'e is torn or missin'

Part I consists of 20 multiple choice questions and the first portion of the relevant section Part IIcontain 50 multiple choice and one or more descriptive questions

ns!er 4oo#let for Part II


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Part I: Multi.le Choice uestions

(This .art is com.ulsor 'or all Caniates)

%! *iolo

1. The scientist most closel" associated !ith the Theor" of 8volution is

a+ alton& %+ 8instein& c+ :endele"ev& d+ ar!in

2. ll of the follo!in' are mammals except

a+ )hale& %+ shar#& c+ dolphin& d+ seal

. ;aina% is expectin' her 10thchild. ll of her other children are females. The pro%a%ilit" that her 10 thchild !ill also %e a 'irl

is

a+ 0.9& %+ 0.1& c+ 0.5& d+ none of these

/. In an area populated %" the follo!in' species !hich of the follo!in' !ould most pro%a%l" have the lar'est populationero acceleration& *d+ a %od" havin' constant velocit" %ut non->ero acceleration

2. If a fixed mass of !ater is cooled slo!l" from 100 to 00& its volume

a+ Increases steadil"& %+ decreases steadil"& c+ first increases and then decreases d+ first decreases and then increases

3. %loc# slides do!n a frictionless ramp and a sphere rolls !ithout slidin' do!n a ramp of the same an'le G. The %loc# andsphere have the samemass&start from rest at pointA& and descend throu'h pointB In that descent. The !or#done %" the

'ravitationalforceon the %loc# is

a+ @reater than& %+ less than& c+ the same as the !or# done %" the 'ravitational force on the sphere. d+ Beed more informationto ans!er this question

/. )hich of the follo!in' properties of a solid !ould chan'e if it !ere transported from the 8arth to the :oon"'ous dominant%+ Como>"'ous recessive

c+ Cetero>"'ous

d+ Bone of the a%ove

29. The term phenot"pe refers to traits li#e

a+ Structure%+ Ph"siolo'"

c+ 4ehavior

d+ ll of a%ove

0. The nucleus contains

a+ :itochondria

%+ "tosol

c+ 8n>"med+ B

1. nother name for @ol'i complex is

a+ ict"osome

%+ 8ndoplasmic reticulum

c+ "tomem%rane s"stem


2. Aeucoplasts are a #ind of

a+ A"sosomes%+ hloroplsts

c+ Plastids

d+ @rannum

. ?acuole in plants are responsi%le for

a+ Photos"nthesis

%+ ellular excretion

c+ Tur'or pressured+ Starch stora'e

/. C"dro'en peroxide de'radation in a cell is a function of

a+ A"sosomes

%+ ri%osomes

c+ :itochondria

d+ :icro%odies

5. ontrolled de'radation and material processin' is a function of

a+ A"sosomes%+ m"loplast

c+ "tos#eleton

d+ Bucleoid

3. ell mem%ranes are composed of


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a+ =un'i

%+ =lo!erin' plant

c+ ,oses

d+ l'ae

/5. Triploid endosperms nucleus is a result of

a+ :itosis%+ ross pollination

c+ Self pollination

d+ ou%le fertili>ation

/3. :utuall" %eneficial association is called

a+ S"m%iosis

%+ Saproph"tism

c+ Parasitism

d+ ommensalism

/. ,oot nodules har%or

a+ Saproph"tic fun'i

%+ Parasitic %acteriac+ Bitro'en fixin' %acteriad+ ?iruses

/7. 4acteriopha'es are

a+ Parasitic %acteria

%+ Spore formin' %acteria

c+ ?irus attac#in' %acterai


/9. 4acteriopha'e exhi%it life c"cle that are

a+ A"tic

%+ A"so'enic

c+ Beither or 4d+ 4oth K 4

50. "tosine and 'uanine are

a+ Purines%+ P"rimidines

c+ @l"cols d+ @l"cerol

*iolo: 2escri.ti6e uestion(s)

escri%e the #e" features of ?irus and 4acteria and list a fe! diseases caused %" themin' a'entation depends upon the

+ nature of the solvent 4+ nature of the solute + temperature of the solution + all of the a%ove

9+ t the %e'innin' & the reaction rate for the reactions is

+ lar'est then decreasin' 4+ lar'est and then remains constant + smallest then increasin'

+ smallest and remains constant

/0+ )hat is the oxidation num%er of :n in :nD/+ F2 4+ F/ + -1 + F

/1+ 8nthalp" is an expression for+ heat content 4+ ener'" state + reaction rate + activation ener'"

/2+ The emission of a %eta particle results in a ne! element !ith atomic num%er

+ increased %" 1 4+ increased %" 2 + decreased %" 1 + decreased %" 2

//+ metallic oxide placed in !ater !ould most li#el" "ield an

+ acid 4+ %ase +metallic anh"dride +%asic anh"dride

/5+ 10 N solution of Bal means that in 100 'rams of solution there is

+ 5.75 ' Bal 4+ 57.5 ' Bal& + 2 ' Bal & + 10 ' of Bal

/3. ommercial h"dro'en is frequentl"o%tained from !hich one of the follo!in'oid 4 is 17& and a E 2%& then c E

a+ /./

%+ 7.9/

c+ 5.125

d+ 2

1/


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=i'ure 5

7. If the 'iven an'les have the measures indicated in =i'ure 3& the

measures of x and " are

a+ x E 1000& " E 900

%+ x E 120

0

& " E 75

0

c+ x E 1200& " E 900

d+ x E 1000& " E 750

=i'ure 3

9.If f*x+ E

1

x

and x ta#es on successive values from 10 to 10

1& then

a+ f*x+ increases throu'hout

%+ f*x+ decreases throu'houtc+ f*x+ increases& then decreases

d+ f*x+ decreases& then increases

10. 'old %ar !ith dimensions /2 has all of its facesrectan'ular. If it is melted and recast into three cu%es of equal

volumes& !hat is the len'th of an ed'e of each cu%eed

7. The pressure exerted %" a 'as in an enclosed isolated container is J*a+ directl" proportional to the densit" of the 'as

*%+ inversel" proportional to the densit" of the 'as

*c +independent of densit" of the 'as

*d+ directl" proportional to the square of the densit" of the 'as

7. particle that is movin' alon' a strai'ht line decelerates uniforml" from /0 cms to 20 cms in 5.0 s and then has a

constant acceleration of 20 cms2durin' the next /.0 s. The avera'e speed over the !hole time interval is *a+ 5 cms *%+ 1/0 cms *c+ 73 cms *d+ / cms

9. If the initial speed of a proRectile is dou%led& its ran'e !ill

*a+ dou%le *%+ decrease %" one-half *c+ increases %" a factor of four *d+ decreases %" a factor of four.

10. car 'oin' around a curve of radius , at a speed ? experiences a centripetal acceleration c. )hat is its acceleration if it

'oes around a curve of radius 2, at a speed of ?.

21. positive char'e that is free to move %ut is at rest in an electric field 8 experiences a force that is

a+ In the same direction as 8. c+ Perpendicular to 8.

%+ In the direction opposite to 8. d+ ;ero %ecause the speed is >ero.

22. motor runnin' from a 220-? line is liftin' a mass of 5 #' at a constant speed of 3.0 ms. ssumin' 100N efficienc"&

the current required is*a+ 0.2 *%+ 9./ *c+ . *d+ ./

2. The conservation of ener'" in an electric circuit is closel" related to !hich of the follo!in'ed li'htero.

%. into the pa'e.c. out of the pa'e.

d. to!ards the %ottom of the pa'e.

23. force = has the components =xand =". The ma'nitude =xof the force component in the x

direction is 'iven %"

*a+ =- =" *%+ *=- ="+12 *c+ *=+12- *="+

12 *d+ *=2- ="2+

12

2. The coefficient of static friction %et!een cars tires and a level road is 0.70. If the car is to %e stopped in a maximum time

of .0 s& its maximum speed is

*a+ 2./ ms *%+ 2.5 ms *c+ .7 ms *d+ 2.3 ms

27. car to!in' a trailer is acceleratin' on a level road. The car exerts a force on the trailer !hose ma'nitude is

a. the same as that of the force the trailer exerts on the car.

%. the same as that of the force the trailer exerts on the road.

c. the same as that of the force the road exerts on the trailer.d. 'reater than that of the force the trailer exerts on the car.

29. %all is thro!n verticall" up!ard at 20 ms. The %all comes to a momentar" stop in approximatel"

*a+ 0.5 s *%+ 1.0s *c+ 2.0 s *d+ 1.5s

0. The 2.5-#' head of an ax exerts a force of 70 #B as it penetrates 17 mm into the trun# of a tree. The velocit" of the ax head

!hen it stri#es the tree is

*a+ 1.2 m s *%+ ./ m s *c+ / m s *d+ 10 m s

1. urin' a serve& a tennis rac#et exerts an avera'e force of 250B on a 30-' tennis %all& *initiall" at rest+ for 5.0 ms. The %alls#inetic ener'" after!ard is

*a+ 1 *%+ 1.25 *c+ 0.7 *d+ none of all

2. If !e travel round the earth& !e !ould find that the earths ma'netic field

a. is the same in direction and ma'nitude ever"!here.

%. varies in direction %ut not in ma'nitude.

c. varies in ma'nitude %ut not in direction.

d. varies in %oth direction and ma'nitude.

. )hen a movin' char'ed particle enters a uniform ma'netic field in a direction parallel to the field lines& the particles

*a+ direction is chan'ed. *c+ ener'" is chan'ed.

*%+ velocit" ma'nitude is chan'ed. *d+ motion is unaffected.

/. driver !ith a flashli'ht shines a li'ht %eam up!ard from the %ottom of a pool at an an'le of incidence of /00. The li'ht

leaves the surface of the pool at an an'le of refraction of 300. The index of refraction of !ater is

*a+ 0.3 *%+ 0./ *c+ 1. *d+ 1.5

5. :olecular motion in a 'as stops

a. at a%solute >ero. c+ !hen the 'as %ecomes solid

%. !hen the 'as %ecomes liquid d+ !hen the pressure on it exceeds a certain value

3. The dimensional representation for Plan#s onstant is identical to that of

*a+ torque *%+ po!er *c+ linear momentum *d+ an'ular momentum

22


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. Ima'ine a s"stem of units in !hich the unit of mass is 10 #'& len'th is 1#m and time is 1 minute. Then 1 in this s"stem is

equal to

*a+ 30 *%+ .3 *c+ .3 x 103 *d+ .3 x 10-/

7. particle moves alon' a strai'ht line accordin' to the 8q. s2E at2F2%tFc& !here s is the distance traveled in time t and a& %&

c are constants. Then& acceleration varies as

*a+ s

-

*%+ s

2

*c+ s

-2

*d+ s

2

9. %od" movin' !ith uniform acceleration has velocities 20 m s -1and 0 m s-1!hen passin' throu'h points and 4. Then

the velocit" mid-!a" %et!een and 4 is

*a+ 25 m s-1 *%+ 25.5 m s-1 *c+ 2/ m s-1 *d+ 103 m s-1

/0. s the distance %et!een the char'es of an electric dipole increases&

*a+ the dipole moment decreases. *c+ the dipole moment remains the same

*%+ the dipole moment increases *d+ the total char'es decreased.

/1. urin' a proRectile motion& if maximum hei'ht equals the hori>ontal ran'e& then the an'le of proRection !ith the hori>ontalis

*a+ /5.0o *%+ 3./o *c+ 1.5o *d+ 3.0o

/2. %om% of mass 9-#' explodes into t!o pieces of masses #' and 3 #'. The velocit" of the mass -#' piece is 13-m s -1.

The #inetic ener'" of the mass 3 #' piece is

*a+ 93 *%+ 192 *c+ 7/ *d+ 37

/. The momentum of a %od" decreases %" 20N& then the percenta'e decrease in #inetic ener'" is

*a+ /0N *%+ 20N *c+ 3N *d+ //N

//. sprin' of force constant is cut into three equal parts. Than the force constant of each part is

*a+ *%+ *c+ *d+

/5. mon#e" of mass 20-#' rides on a /0-#' trolle" movin' !ith constant speed of 7 ms-1alon' a hori>ontal trac#. =rictio

forces can %e ne'lected. If the mon#e" Rumps verticall" !ith respect to the movin' trolle" to 'ra% the overhan'in' %ranch o

tree& the speed of the trolle" after the mon#e" has Rumped off is

*a+ 0 ms-1 *%+ 7 ms-1 *c+ 12 ms-1 *d+ 13 ms-1

/3. The mass and diameter of a planet are t!ice those of the earth. )hat !ill %e the period of oscillation of a pendulum on

planet& if it is a seconds pendulum on the earth

nstc 7 sample paper 02009 11 v1

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