Skema Jawapan Sains Kertas 2 Ting 4

PEPERIKSAAN AKHIR TAHUN 2009 DAERAH SEGAMAT JOHOR SCIENCE FORM 4 No soalan Section A

Jawapan

Markah

Jumlah

a) Blood group A Number of 6 pupil

B 7

AB 2

O 15

2m

b. 2m

c. Body weight Berat badan Can role tongue or not Boleh menggulung lidah atau tidak Type of hair Jenis rambut

/

1m

5m

2 2m

b. 2.2 + 0.1 from plain mirror c.

3

4

1m

i. virtual ii. Same saiz iii. lateral inverted iv. image distance = object distance (any two) a. Reaction between metal L and dilute sulphuric acid released more gas compare to the other reaction b. Metal L is more reactive compare to metal P c. (i) Types of metals (ii) Amount / volume of gas released d. The more reactive the metals the more gas is released when react with acid

2m

5m

1m 1m 1m 1m 1m

5m

a. Types of ice

Melting point / oC 1m

Pure ice

0

Ice + common salt

-2

b. The melting point is decreased when salt is added c. (i) Types of ice / present or absent of salt (ii) Melting point of ice d. The operational definition of pure ice is shown by the substance that melts at 0oC

1m

a) Pancrease b) Diabetis Mellitus // too much sugar in blood // level of glucose is high in blood c) Ovary d) Control development of female secondary sexual characteristic // control menstrual cycle // control the production of ovum / gamete e) (i) Goiter

1m 1m

1m 1m 1m 5m

Section B 5

1m 1m

1m

(ii) Iodine 6

7

8

9

1m

a) Fertilisation b) (i) Mitosis (ii) To increase the number of cell for growth // to produce new cell // to replace old cell c) Identical twin d) Both boys / both girls e) 22+X a) i) pure copper ii) impure copper

1m 1m 1m

b) Electrical energy to chemical energy c) Copper nitrate // Copper sulphate // Copper chloride d) (i) Cathode become thicker (ii) Anode become thinner a) X : Beta Y : Gamma Z : Alpha

1m 1m

b) Because its charges is negative c) Placed the radioactive substance in thick lead block / concrete d) To detect underground pipe leakage /

1m 1m

a) Spectrum produce on the screen // Rainbow colour produce on screen b) Dispertion of light / c) P : Red Q : Violte d) White light from on screen e) Rainbow

1m

1m 1m 1m 1m 1m

1m 1m 3m

1m

6m

6m

6m

6m

1m 1m 1m 1m 1m

6m

TOTAL

30M

10 a) Hypothesis

SECTION C Metal conduct electricity whereas non-metal do not conduct electricity

b)

1m 1m

i. Aim of experiment ii. Identification of variables

To study the conductivity of electricity between metal and non-metal Manipulated variable :type of substances

1m

Respond variable :conductivity of the electricity

1m

Constant variables :number of dry cell

1m (any two)

iii. List of apparatus

and material

Iron nail, glass rod, connecting wire, bulb, 2 pieces of dry cell.

iv. Procedure /method / step

Max 2m 1m

Diagram

v . ,

Iron nail

i. The circuit is prepared/set up as shown in the diagram above. ii. The iron nail is connected to the electric circuit using

1m

connecting wire. iii. The observation is recorded in the table provided.

1m

iv. The experiment is repeated by using glass rod.

1m 1m 4m

vi.Tabulation of data

Type of substances

Electrical conductivity 1m

(bulb light up or not)

Iron nail Glass rod

TOTAL

10

11 a) i. ii. iii. iv.

Answer Escape from stress and problem For pleasurable and sensation Influence by peer group Curiosity Any answer three

Mark 1 1 1 1 3m

b) Identifying the problem

Involved in drug abuse for 6 months

Method to solved

i.

Send the son to SERENTI CENTER

1

ii. Bring to the counselor for advise

1

iii. Report to the police

1

iv. Traditional treatment

1

v.

The best method

Marks

Send to hospital

1

Send the son to SERENTI CENTER because his son can be monitor all the time, counseling and treatments .

Max 4 marks 1 1

2 marks TOTAL

10 MARKS

12. a) Alloy

Pure metal

Strong

Weak

1m

Resistance to corrosion

Easy to corrode

1m

Better shiny and beautiful appearance

Shiny

1m

Hard

Malleable

1m 4m

b) Two common characteristic Initial concept

1. Strong

1m

2. Resistance to corrosion

1m

Strong and resistance to corrosion are initial concept for an alloy

1m

Other example and non-example

Other example for an alloy is medal and nonexample for an alloy is iron nail.

1m 1m

Actual concept

An alloy are strong, resistance to corrosion and hard.

1m 6m

TOTAL

10 MARKS