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Std 6 Science Paper 2 Exam Questions
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SULIT 13
Section BB
'E120 marks/20 +lAnswer all questio,rzs. Write your answers in the space provided.
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1 A group of pupils has carried out an investigation. They put balloon Pand balloon Q over the neck of flask that contain mixtures of different
compositions respectively, and then observe the conditions of the
balloons after 20 minutes. Diagram 1 shows the observation results of this
investigation.
- 9E + E&.41 t - r^ x b " 4&' 4n lv, P n*-4" Q nt*'* n\ * E #-6 6 nt"^htr';Y"+hfrh\"Ih#tuL, +E20+4f ExnFn&h4'fti['" K I -w-
'rrd tn Xb#Jil,R^* K,,Balloon P
P Fr.I*
Sugar+Yeast+WaterfH+&*Effi+zlt
Diagram Itrt
(a) In this investigation, state
E*,Edrfr*4ff,(i) what is changed (manipulated variable) :
,L, ,fi fkq_fi F tfr Q*2IL+L q, dt) ,
what is observed (responding variable) :
,x)fitfr,K#t#tfi (kE,B { 4t) '
Balloon Q
a -rl,tAX$r:\?
Sugar + Wate
f,H + zK
After 2o minutes O'/20 h\++E \-';r-!) X nJl:\ lq(. -.--.) ( -.. )v
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ForExaminer's
Use
1(b)
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(b)
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Based on the observation result of balloon P, state one reason (inference).
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State the conclusion of this investigation.
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2 Diagram 2 shows a set-up of an investigation. Chee Kang puts W, X, Y and
Z, four models that have the same height but different base areas, on top of a
piece of wooden plank. He then slowly lifts up one end of the wooden plank.
He observes the sequence when the models topple over.
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rn+ ffi 4xtr'H h|+Fg,iktr- rk++LL , R E t€ ,1€.1&*s/a +E hl - iH trh
€. ,le,$,K+*4j4ttT h1 *,8;k&,,
Wooden plank
^1,(Diagram 2
EZ(a) State one variable that is kept the same (constant variable) in this
investigation.
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Predict the observation of this investigation.
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11 mark/ I h\l
(c) Based on your answer in (b), state one reason (inference).
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lI mark/ 1 ltl
(b)
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2(b)
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The height of an object will affect its stability.
+h 4t'#r -tu E&,*YIJ,A +h 4+hl + +,?+L .
State the relationship between the variable that is changed (manipulated)
and the variable that is observed (responding) in this investigation based
on the statement above.
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"
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16
(d)
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3 Diagram 3 shows Mei Yun carries out an investigation. She puts two
similar types of fish J and K, on the table in the kitchen and in the freezer
respectively, and observes the conditions of the fish after three days.
K 3 .8 a,*^&-4i#t-"fiX4f. )&.1v, 14" Kfrf.4f *iaFl*.1 @*fr\ikTtr E{ E 9t1 ++ -}fi" ,tYi;6 t1t+,,t t* g- , + E -= kE xn,* @h1
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Fish J
t&
Diagram 3
E:State the purpose (aim) of this investigation.
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(b) Predict the conditions of the fish after three days.
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[1 nark/11.a.]
(c) Based on your answer in (b), state one reason (inference).
+g+E4t,E (b) 'n a4 *F , E *, -+ R B (jE Bf ).
ll mark/ t h\l
t7
(a)
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3(b)
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3(c)
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18
(d) State the conclusion of this investigation.
E *, q4 Xbfrt 2*'tt "
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sulrr 19
4 A group of pupils inserts a bamboo pole in the middle of the field. They
observe the shadow'lengths of the bamboo pole at different times throughout
the day. The bar chart in Diagram 4 shows the results recorded.
- 98+ EEbYlh ffi + *4fr 1 - L++ + " 4e,4n E- XYfit 4 t4 Fi ldl
xr,*+t ff "J
t #r K E " g 4 fr1 *fi en+ K .E fr Fn nL*#t 2t K "The length of the shadow/cm
**'**lKF.tcm
8 a.m. 9 a.m. 10 a.m. 11 a.m, 12 noon 1 p.m. 2 p.m. 3 p.m. 4 p.m.
Diagram 4
Bq(a) State one information collected in this activity.
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11 mark/ | h\f
(b) Based on Diagram 4, state the trend of change in the lengths of shadow.
+Y+EW 4, E *' #)'r #r k E at q-4Y'frt x "
17 mark/1 h\l
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4(b)
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4(c)
4(d)
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(c) State one reason (inference) based on the length of the shadow at12noon.llttYttE-frI tz fti6i&A, E *,-+rF,E (JEffi).
l1 mark/l h\l
(d) State the conclusion in this activity.E *, &'fi'ftA #r etit
"
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b
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5 Mr. Zhang used two different types of methods to plough the farmland, in
order to test the areas that can be ploughed in 5-hour time. Table 2 shows the
results recorded in this activity.
lk4h 4h il n ffi fr 4 Fl #r n'i* { w, vx,rrl ii E 5 l''J' Ht *r F'f A\&11il*h1r
iew ffilx" *-2 F"-;s&tfr)taffi)L*2!K"Method Xw trt
Table 2
tz(a) State the aim (purpose) of this activity.
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(b) Based on the difference in the areas that can be ploughed by methods X
and Y in 5-hour time, state two reasons (inference)'
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: Ploughing method4EHlT;*
. "fhe areas that ean be
l ploughed in S-hour
' time/krf, € 5 fd'FlFlFfif,Effif*
. *!ffiFlE:fF/km2
MethodYY Ei*
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(ii)
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7)
The advancement of the tools will affect the time needed to
complete the tasks.r-+k1 +,&+Ztr_+7rj"fuF,ty"r-+F|t €fit fr.iiul .
(c) Based on the statement above, state the relationship between the variable
that is changed (manipulated) and the variable that is observed (responding).
+y.+E L:s.fr1-i/,H[ , E *, ,)1, )fr fk{_fi F t^ Q*9k+Lq 4t) fi" ,;b )fiil,*ai 4 4 (E,i:1,14 q, *t) Zn #r X- A "
ll mark/ I h\l
END OF SECTION B
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