31 okt sains k1 dan k2_skema sains k2 t2 2012
DESCRIPTION
SKEMA SAINS TINGKATAN 2TRANSCRIPT
PERATURAN PEMARKAHAN PROGRAM PENINGKTAN PRESTASI KADEMIK PEPERIKSAAN TOV 2012
SAINS KERTAS 2
No. Mark scheme Mark Total1. (a)
(b)
Able to label the steps in scientific investigation correctly.Answer :P : carrying out the experimentQ : writing a reportR : analysing data
Able to match the steps in scientific investigation with th explanation correctly.
111
1
1
1
3
3
6
2. (a)
(b)(i)
Able to label the energy possessed by the boy at P correctly.Answer :P : Potential energy
Able to state the energy change that occurs correctly.Answer : P Q
1
1
1
1
Identifying the problem Mengenalpasti masalah
Planning the experiment Merancang eksperimen
Identifying the variables
Mengenalpasti pembolehubah
Forming a hypothesis membentuk hipotesis
Determine what we want to find out
Menentukan apa yang dikehendaki
To make a smart guess Membuat tekaan yang
tepat
Potential Energy Kinetic Energy
(ii)
(c)
Able to mark (√) the maximum energy correctly.Answer :
Kinetic EnergyTenaga kinetik
√
Potential EnergyTenaga Keupayaan
Able to mark (√) in the box the examples of heat energy.Answer :
√ √
1
2 2
6
3. (a)(i)
(ii)
(b)
Able to state the condition of the bulb correctly.Answer :The bulb lights up.
Able to give reason correctly.Answer : Carbon is a good conductor of electricity.
Able to mark (√) to identify substances J and K correctly.Answer :
1
1
1
1 2
SubstanceBahan
MetalLogam
Non-metalBukan logam
J √
K √
(c)
Able to state two other properties of J.Answer :
i. Malleableii. Shiny
Other answers : high melting point / high boiling point/ductile
1
1 2
6
4. (a)(i)
(ii)
(b)(i)
(ii)
(c)(i)
Able to state the type of energy produced by all the activities correctly.Answer : heat
Able to state the heat transferred in R correctly.Answer : radiation
Able to state the thermometer that shows a higher final temperature correctly.Answer : Q
Able to state one reason correctly.Answer : Black paint/surface absorbs heat better // Black paint is a good absorber of heat
Able to state one advantage of using white colour tent correctly.Answer :Cooling effect
Able to give one reason correctly.Answer :White tent reflects heat // white is not a good absorber of heat.
1
1
1
1
1
1
6
5. (a)(i)
(ii)
(b)(i)
Able to state which balloon becomes bigger correctly.Answer : L
Able to give reason correctly .Answer :Higher temperature increase the air preassure.
Able to state what happen to balloon P correctly.Answer : contracts / deflates
1
1
1
(ii)
(c)
(d)(i)
Able to give reason correctly.Answer :Lower temperature decreases the air pressure.
Able to name one other factor that affect the air pressure correctly.Answer :Volume of container / size of container
Able to explain why the boy is able to drink the juice correctly.Answer :When the juice is sucked up, air pressure inside the straw decreases.The higher atmospheric push/force the juice into the straw.
Able to give a reason correctly.Answer :The pressure inside and outside the straw is the same.
1
1
11
1
2
1
86 6. 6 (a) a)(i)
(ii)
Able to state the class of food correctly.Answer : Carbohydrate
Able to predict the observation correctly.Answer :
Food test Test using Benedict’s solution
Test using Millon’s Reagent
Set R No change Change to brick red precipitate
Set S Change to brick red precipitate
No change
Able to state the one reason for the presence of saliva in set S correctly.Answer :To digest/breakdown starch
Able to calculate the total calories burnt correctly.Answer :Driving a car - 110 caloriePlay tennis - 350 calorie
1
1
1
1
1
1
2
1
(iii)
Total - 460 calorie
Able to choose the healthy food and able to explain correctly.Answer :
Food P.
It has only 5% of fat and 15% of fibre
1
1
1
2
2
8 7
.(a)(i)
(ii)
Able to write the part of plants that response to the stimuli correctly.
Able to classify the type of responses correctly.Answer :
1
1
2
2
2
4
Type of tropism Jenis tropisme
Part of plants Bahagian tumbuhan
P root
Q shoot
Types of responses P, Q, R, S
P P, S
Q Q, R
(b)
(c)
Able to state one inference of P correctly.Answer :The roots grow downward because it needs water.
Able to predict what happened if light hole of Q is covered correctly.Answer :The shoot grow upwards / straight.
1
1
1
1
8
(8 ) a)(i)
(ii)
(iii)
(iv)
(b)
(b)(i)
Able to state the observation of beaker P and Q correctly.Answer :All sugar in beaker P dissolves while the sugar cube in beaker Q is still present.
Able to write one inference based on P or Q correctly.Answer :The sugar in beaker P dissolves because the size of solute is smaller // the surface area is bigger.
Able to predict the rate of solubility of sugar if powdered form is used correctly.Answer :The rate of solubility is higher.
Able to state the relationship between the size of solute and the rate of solubility correctly.Answer :The smaller the size of solute, the higher the rate of solubility.
Able to state the time taken for the sugar to dissolve in beaker Q correctly.Answer :
1
1
1
1
1
1
1
1
1
1
(ii)
Able to draw a bar chart correctly.Answer
Time taken for sugar to dissolve Masa yang diambil untuk gula
22
11
5
P Q R Type of water Jenis air
Able to state one hypothesis correctly.Answer :The higher the temperature of water, the lower the time taken for the sugar to dissolve //different type of water, different time taken for the
2
1
1
2
1
Type of water Jenis air
Time taken for sugar to dissolve Masa yang diambil untuk gula
melarut
P 22 seconds 22saat
Q 5 seconds 5 saat
R 11 seconds 11 saat
(c)
sugar to dissolve.
Able to state the variables correctly.Answer :
Responding variable Time taken for the sugar to dissolve
Manipulated variable Type of water
Controlled variable The size of solute
Able to state the operational definition for solubility correctly.Answer :Solubility is the time taken for the sugar to dissolve.
1
1
1
3
1
12