IJSO Question Paper 2007 (MCQ)

4th INTERNATIONAL INTERNATIONAL JUNIOR SCIENCE OLYMPIAD TEST COMPETITION December 4, 2007

Read carefully carefully the following instructions: 1. The The time time availa availabl blee is 3 hou hours rs.. 2. The total total number number of the the questions questions is is 30. Check Check that that you have a complet completee set of the test questions and the answer sheet. 3. Use Use only only the the pen pen pro provi vide ded. d. . !rite down down your name" name" code" code" country country and si#natu si#nature re in your your answer sheet. sheet. $. %ead %ead carefully carefully each probl problem em and choose choose your correct correct answer answer by crossin crossin# # one of the capital letters in your answer sheet. There is only one ri#ht answer for each problem. Example: 1

&

'

C

(

). *f you want want to chan#e chan#e your your answer answer"" you have have to circle the the first answer answer and then cross a new letter as your correct answer. answer. +ou +ou may only allow makin# makin# one correction. Example: 1

&

'

C

(

& is the first answer and ( is the corrected answer ,. &ll compet competito itors rs are not allowed allowed to brin# brin# any statio stationar nary y and tools tools provided provided from outside. &fter completin# your answers" all of the question and answer sheets should be put neatly on your desk. -. oint rules / •

Correct answer

/  1.0

•

!ron# answer

/

o answer

/

•

point

0. 0.2$ point

−

0.0

point

Ci

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4th INTERNATIONAL INTERNATIONAL JUNIOR SCIENCE OLYMPIAD TEST COMPETITION December 4, 2007

EXAMINATION RULES 1. &ll &ll comp compet etit itor orss must must be pres presen entt at the the fron frontt of eam eamin inat atio ion n room room ten ten minutes before the eamination starts. 2. o competi competito tors rs are are allow allowed ed to brin brin# # any any tool toolss ecep eceptt his4h his4her er perso persona nall medicine or any personal medical equipment. 3. 5ach competi competitor tor has has to sit accordin# accordin# to his or her desi#nate desi#nated d desk. . 'efore 'efore the eamina eaminatio tion n starts" starts" each competit competitor or has to check check the stationar stationary y and any tools 6pen" ruler" calculator7 provided by the or#ani8er. $. 5ach 5ach competit competitor or has to check the questi question on and answer answer sheets. sheets. %aise %aise your hand" if you find any missin# sheets. 9tart after the bell. ). (urin rin# the the eam eamin inat atio ion n" com competi petito tors rs are are not not allo allow wed to leav leavee the the eamination room ecept for emer#ency case and for that the eamination supervisor will accompany them. ,. The The competit competitors ors are not allowe allowed d to bother bother other compet competito itorr and disturb disturb the eamination. *n case any assistance is needed" a competitor may raise his4her hand and the nearest supervisor will come to help. -. There There will be no question question or discussi discussion on about about the eamin eaminatio ation n problems. problems. The competitor must stay at their desk until the time allocated for the eamination is over" althou#h he4she has finished the eamination earlier or does not want to continue workin#. :. &t the end end of the eamin eaminatio ation n time there there will will be a si#nal si#nal 6the rin#in rin#in# # of a bell7. +ou are not allowed to write anythin# on the answer sheet" after the alloca allocated ted time is over over. &ll compet competito itors rs must must leave leave the room room quietl quietly y. The question and answer sheets must be put neatly on your desk.









Test Competition, 4 th IJSO, Taipei, Taiwan, December 4, 2007

TEST OM!ETITION "# *n #ene #eneral ral"" durin durin# # the the early early sta#e sta#e of embr embryo yo#e #ene nesi sis" s" the the 8y#o 8y#ote te divi divide dess

contin continuou uously sly.. *n this this sta#e" sta#e" the volume volume of the develo developin pin# # embryo embryo does does not obviously increase; however" the ratio of the total mass of nuclei to the total mass of cytoplasm for the developin# embryo chan#es. !hich one of the followin# curves shows the chan#e of the ratio correctly<

6&7 n

6C7

6'7 n

u c l e i 4 c y t o p l a s m

u c l e i 4 c y t o p l a s m

time 6hour7

6(7

n u c l e i 4 c y t o p l a s m

time 6hour7

time 6hour7

n u c l e i 4 c y t o p l a s m

time 6hour7

protoplast. The wall layer that is formed $# The cell wall in plants is formed by the protoplast. first makes up the primary wall 6!7. The union re#ion between the primary walls of the ad=acent cells is called the middle lamella 6>?7. >any plant cells" such as fiber cells" also possess additional walls" known as the secondary wall 69!7. !hich one of the followin#s lists the correct sequence of the location of the wall layers between two mature fiber cells< 6&7 !" 9!" >?" 9!" ! 6'7 9!" !" >?" !" 9! 6C7 >?" !" 9!" 9!" !" >?










%# &s plants under#o respiration" the ratio of the number of &T produced to the

consum consumed ed number number of @2 molec molecul ules es is calle called d the the 4@ 4@ ratio ratio.. Unde Underr norm normal al condition" the ratio of 4@ is 3. (urin# respiration" the ratio of the number of C@2 molecules released to the molecules of absorbed @2 6C@2 4@27 is called %espiration %espiration Auotient Auotient 6%.A.7. 6%.A.7. *n #eneral" #eneral" certain or#anic or#anic substance" substance" such as #lucose 6C)B12@) D7 " citric acid 6C)B-@, E7" or fatty acid 6C )B12@2 F7" is needed for the respiration respiration of plants. plants. !hen any one of these substances substances with the same amount of moles is supplied to plants" which one of the followin#s is the correct order for the values of %.A. and the produced numbers of &T #enerated by respiration of plants< 6&7 %.A./ EG EG＞DG＞F; the produced number of & &T/ T/ FG F G＞DG＞E 6'7 %.A./ FG FG＞DG＞E; the produced number of &T/ E G＞DG＞F 6C7 %.A./ FG FG＞DG＞E; the produced number of &T/ F ＞GD＞GE 6(7 %.A./ EG EG＞D＞GF; the produced number of & &T/ T/ EG E G＞DG＞F &# *t is known that some specific species of fun#i can facilitate the processes of seed

#ermination and seedlin# #rowth for the orchids. Concernin# the plant or#ans where the fun#i are distributed and the relevant function of the fun#i on the orchids" which one of the followin#s is correct< 6&7 fruit" for facilitatin# the di#estion of nutrients 6'7 leaf" for facilitatin# the formation of nutrients 6C7 stem" for facilitatin# the transportation of water and nutrients 6(7 root" for facilitatin# the water absorption









Test Competition, 4 th IJSO, Taipei, Taiwan, December 4, 2007 foodnetwork of a community community.. !hich one of the '# The fi#ure shown below is the foodnetwork followin# consumers" if it becomes etinct" will make the most si#nificant impact on this ecosystem<

*nsects

6&7 ?i8ards

?i8ards

lants

6'7 9nakes 6C7 5a#les

Hro#s

6(7 %ats %ats

9nakes

s Hoes

%abbitt

s (# %e#ardin# the functions of the stomach" which ones of the followin# statements

are true< true<？ 617 di#estion and decomposition of proteins 627 di#estion and absorption of fat 637 killin# of most bacteria in food 67 stora#e of partial di#ested food 6&7 1" 2 6'7 1" 3 6C7 2"  6(7 2" 3

5a#les









Test Competition, 4 th IJSO, Taipei, Taiwan, December 4, 2007 %U-) is a le#al abortive abortive dru# and its pharmacolo#ical pharmacolo#ical effect is to inhibit inhibit the )# %U-) pro#esterone bindin# with its receptor in endometrium" causin# in endometrium erosion" and finally resultin# in the abortion of early pre#nancy. The effect of prosta#landin is to promote uterus contraction. *f a woman were administrated with the combination usa#e of %U-) and prosta#landin within : days after the end of menses" the successful ratio of abortion could be hi#h and ran#es from :)I to ::I. Bowever" this woman has to be strictly checked and traced by doctors for 2J3 weeks to #uarantee her safety. safety. &dmi &dmini nistr strate ated d %U%U-) ) with with pros prosta# ta#lan landi din n can can make make women women to abor abort. t. The The followin# chart lists possible effects of these dru#s. !hich combination is correct < %U-) action 1. inhib inhibit it pro#est pro#estero erone ne recept receptor or format formation ion 2. promote pro#esterone action 3. inhibit embryo implantation . ca cause en endometriu rium in inflamma mmatio tion

rosta#landin action a. promot promotee the bindi bindin# n# of %U%U-) ) to the pro#esterone receptor b. relieve pain c. anesthetic effect d. st stren#then ut uterus rus co contra tractio tion

6&7 1" d 6'7 2" a 6C7 3" d 6(7 " c *# !hich one of the followin# eperience is the most critical evidence for provin#

the relevance of elicobacter of elicobacter p!lori infection p!lori infection with #astric ulcer< 6&7 " 6&7 " p!lori is p!lori is found in all #astric ulcer patientsK stomach. 6'7 !idely effective antibiotic treatment can successfully cure #astric ulcer. 6C7 Lastric ulcer can be induced in healthy people who are infected by " p!lori" 6(7 atients" treated with dru#s that inhibit #astric acid secretion to reduce " reduce " p!lori #rowth" p!lori #rowth" can successfully cure #astric ulcer.











Test Competition, 4 th IJSO, Taipei, Taiwan, December 4, 2007 !an# and his wife had twin babies of a boy and a #irl. The probability that +# >r. !an# the twin babies possess the same M chromosome is 6&7 142 6'7 14 6C7 14) 6(7 14-

",# The ?o#ol solution is a kind of fiatives for stora#e of phytoplanktons in the

field studies. *t is known that a 200 m? ?o#olsolution contains 20 # of N*" 10 # of *2" 10 m? of #lacial acetic acid" and 2.$ I of formaldehyde. Commercial formalin" containin# formaldehyde near 0 I" is used for makin# the ?o#ol solution. Therefore" if one wants to use formalin to prepare a 200 m? ?o#ol solution" solution" one needs needs M ml of formalin. formalin. %obert %obert prepared prepared an incorrect incorrect 200 m? ?o#olsolution by mistakin# the percenta#e of formaldehyde in formalin for 100 I. Be tried to remedy this incorrect ?o#olsolution by addin# more solutions to make it to be a 00 m? ?o#ol ?o#ol solution. Be first added some water to the incorrect incorrec t ?o#olsolution" and then he added 20 # N*" 10 # * 2" 10 m? #lacial acetic acid" and









Test Competition, 4 th IJSO, Taipei, Taiwan, December 4, 2007 ""# The followin# fi#ure shows the heatin# curves of two liquids & and ' obtained

by measurin# temperatures 6T7 as a function of time usin# a burner with a constant heatin# rate. 9uppose that two liquids have the same mass. !hich one of the followin# statements is correct< 6&7 The boilin# point of ' is lar#er than that of &. 6'7 The specific heat capacity of #as is #reater for ' than for &. 6C7 The heat of vapori8ation per #ram of liquid for & is #reater than that for '. 6(7 The specific heat capacity of #as is #reater than that of liquid for substance substance '.

#as

liquid

T

liquid

#as

& '

Time "$# &n electrochemical cell is made by connectin# a copper electrode in 0.2$ ? of

0.100 > Cu9@  solution and a silver electrode in 0.2$ ? of 0.100 > &#@ 3 solution via salt brid#e. !hat is the final concentration of Cu 2 6in >7 in the anode compartment if it produces an avera#e current of 1.0 & for 12 min< 6Haraday  :)-$ CoulombOmol 17









6C7 @2 6(7 C@2









Test Competition, 4 th IJSO, Taipei, Taiwan, December 4, 2007 "&# !hat compound in limestone and marble is corroded by acid rain<

6&7 Ca9@ 6'7 CaC@3 6C7 'a9@ 6(7 b9@  "'# !hich one of the followin#s is the correct description of water and ( 2@<

6&7 !ater and ( 2@ have the same boilin# temperature at the same pressure. 6'7 (2@ has one more neutron than the water molecule does. 6C7 'oth water and ( 2@ can react with alkali metals vi#orously. vi#orously. 1

6(7 1 B and

2 1

( are allotropes

"(# Three randomly labeled beakers" M" +" and Q" contain either temporary hard water"

distil distilled led water water"" or perman permanent ent hard hard water water.. They They are sub=ec sub=ected ted to a sequen sequence ce of analytical tests shown in the followin# fi#ure.

X add soap water and stir at 25 oC

X

with permanent foam Y

Y

Z Y

Z

1) filtered 2) set to boil

without permanent foam but with precipitates

add soap water and stir at 25 oC

with precipitates

Z

Y

with permanent foam

pass through add soap water ion-exchange and stir resin-Nal!"#$)2 at 25 oC

Z









Test Competition, 4 th IJSO, Taipei, Taiwan, December 4, 2007 ")# The enthalpy of combustion for naphthalene 6C 10B-7 is 1230 kcalOmol 1. The

enth enthal alpie piess of form formati ation on for for C@26#7 and B2@6l 7 are are : : and and ))- kcal kcalOm Omol ol1" respectively. !hat !hat is the enthalpy of formation for naphthalene< 6&7 :2) kcalOmol 1 6'7 1- kcalOmol 1 6C7 222 kcalOmol 1 6(7 1)-0 kcalOmol 1 solutions of equal volume are labeled labeled as & / 0.0$ > BCl 6aq7" ' / 0.0$ > "*# Three solutions B29@6aq7" and C / 0.0$ > CB 3C@2B6aq7. !hich one of the followin# followin# statements is correct< 6&7 pB value / 'G ' G＞& ＞GC 6'7 the amount 6in moles7 of salt produced when each solution is neutrali8ed with the same concentration of aqueous a@B / 'G ' G＞&C 6C7 the amount of a@B 6in m?7 needed when each solution is neutrali8ed with the same concentration of aqueous a@B / ' ＞G&C 6(7 6(7 the the fina finall pB valu valuee when when each each solu soluti tion on is neut neutra rali li8e 8ed d with with the the same same concentration of aqueous a@B / &R CR C R＜' +. Their correspondin# metal ions "+# There are four metals labeled as >" " M" and +. are >2" 2" M2" and +2" respectively. The reaction profiles amon# them are compiled as shown in the Table below. !hen > is not reactive toward  2" it is marked as 6P7. Conversely" when > is reactive toward M 2" it is marked as 67. !hich one of the followin# statements is correct< 6&7 the stron#est reducin# a#ent is M












$,# /hich of the following co01inations of ele0ents of gi2en ato0ic nu01ers can lead to a co03ound with a che0ical for0ula of X- %4

6&7 2 and ) 6'7 $ and 1$ 6C7 3 and 16(7 13 and 1, $"# *t is known that when one uses a sin#le sin#le battery in connection with a li#ht bulb"

the the batte battery ry can last last for time time t 0. *f one tries to use two identical batteries in connection with two identical li#ht bulbs" which one of the followin# statements is correct< 6&7 *f the batteries are in parallel and the li#ht bulbs are in series" the batteries can power for t 042. 6'7 *f the batteries are in series and the li#ht bulbs are in series" the batteries can power for 2 t 2 t 0.

















Test Competition, 4 th IJSO, Taipei, Taiwan, December 4, 2007 $%# & 10 # bullet movin# on a hori8ontal strai#ht line at $00 mOs 1 penetrates a 1.0 k#

block block movin# movin# on the the same line line at 1 mOs1 on a frictionless surface. %i#ht after bein# penetrate penetrated d by the bull bullet" et" the the block block moves moves at 2 mOs 1. !hat is the velocity of the bullet ri#ht after it emer#es from the block< 6&7 100 mOs1 6'7 200 mOs 1 6C7 300 mOs 1 6(7 00 mOs 1 $&# *t is known that when 0.1 k# of metal & at $2

liquid ' at 10

°

C

C

°

" the final temperature is 1)

°

is placed in 0.3 k# of some

C

. &ssumin# that all of the

relevant relevant heat capacities capacities do not depend on temperatures temperatures and there is no heat loss" what is the final temperature when 0.2 k# of metal & at )0 of liquid ' at 12 6&7 2

°

6'7 3)

°

C

C

°

C

<

°

C

is placed in 0.$ k#










$(# rof. Q discovers five ob=ects in close to a 9unlike star. The physical properties

of these ob=ects derived from the data 6see Table below7 indicate that only 3 of them them are planets planets orbitin orbitin# # the star" star" which which of the observ observati ations ons are imposs impossibl ible< e< 6Usin# circular orbits to analy8e all the motions involved.7 @b=ect

>ass 65arth mass7 * 2$.0 3 ** :.$ 2 ** * ).0 :0 * .0 1,  3. 1$ 61 &U  avera#e 9un5arth distance7 6&7 * and ** 6'7 * and  6C7 * and 

elocity 6kmOs17

@rbital radius 6&U7 $ 10 23 3$ -0









Test Competition, 4 th IJSO, Taipei, Taiwan, December 4, 2007 $*# *t is known that for a #iven temperature" the amount of water vapor that can be kept

in the air has a maimum. !hen the air contains maimum amount of water vapor" the saturated vapor density is fied and is shown in the followin# table/ Temperature 6

°

C

saturated vapor density 6#5m37

7

0



3.)) ).33

-

12

-.21

10.$,

1)

20

13.$0 1,.12

2

2-

21.$

2).:3

The relative humidity in percent is then defined to be act&al %apor $ensit! sat&rate$ %apor $ensit!

× 100 I

9uppose that the initial temperature inside a car is 20

°

C

and the relative humidity is

-0I. !hen the temperature inside the car decreases" at what temperature does the moisture start to form< 6&7 12

°

6'7 1)

°

6C7 1-

°

C

C C











Test Competition, 4 th IJSO, Taipei, Taiwan, December 4, 2007 %,# & submarine is fied underwater and emits two sound wave pulses into the

water in the forward direction and then detects the echoes reflected from a movin# ob=ect ahead. *f the time interval between two emitted pulses is 10 s and the roundtrip travel time intervals are 2.0 s and 2.1 s respectively" what is the avera#e speed of the ob=ect movin# away from the submarine< 6Liven that the speed of sound wave in water is 1$20 mOs 1.7 6&7 3.- mOs1 6'7 ,.) mOs1 6C7 1$ mOs 1 6(7 23 mOs1

IJSO Question Paper 2007 (MCQ)

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