"Peperiksaan Pertengahan Tahun"
SULIT JABATAN PELAJARAN PERAK PEPERIKSAAN PERTENGAHAN TAHUN 2010 TINGKATAN 3 SCIENCE Mei / Jun 2010 SCIENCE PAPER 2 PERATURAN PEMARKAHAN 1 Questions Rubrics Marks 1 a (i) Q : compression 1 each R: lever S : beam 3m b. weight : compression balance/ spring balance mass : lever balance 3 correct - 2m 2 correct, 1 wrong - 1m 1 correct , 2 wrong - 0 m 1 correct without wrong – 1 m 2m c. kilogram/ kg 1m Total : 6m 2 a (i) from the blood capillary to the body cells 1m Reject: line without arrow : sentence (ii) diffusion 1m b X : higher concentration / more (than Y) y: lower/ less concentration ( than X) NOTE : The answer should show the comparison c. oxyhaemoglobin 1m d. (i) reduce the transportation of Oxygen to the body cells.// body cells will lack of Oxygen Any 1 (ii)use lead – free fuel/ unleaded petrols// correct: (catalytic) converter to the exhaust// 1m Car pooling// use public transport// maintan vehicles under good condition Total : 6m 3 a) increase in size // increase in number of cells// increase in weight 1m b) Infancy/ adolenscence // teenagers c) i. adolenscence Any -1 m 1m ii. female reach puberty faster earlier than male/ male reach puberty late than female./ female reach puberty at the age of ( Any 1- 1 11 to 14) but male reach puberty at the age of ( 14 to 16) m d. i) protein /calcium ii) protein: build new tissue/ /formation of cell calcium : formation of born / teeth 1m 2 1m a. i) hydrogen Total : 6m ii) lighted wooden splinter will produce ‘pop’ sound 4 b. to increase the conductivity of electricity// to make water a better conductivity. 1m c. I) q: p = 10: 5 1m = 2:1 1m d. Water consist of 2 hydrogen atoms & 1 atom oxygen 1m Accept: correct drawing 1m O H H a i) fulcrum is in the middle // fulcrum is between the load and effort// the load & effort act in the same direction ii) scissors / pliers / claw hammer/ can opener Total : 6m accept: any suitable first class device. 5 iii) effort is less than the load// use lesser/ smaller 1m effort b i) P 1: the see saw will be not balance/ imbalance // 2m boy N will go upwards// boy M moves downwards/ P 2: the movement of force of M is greater / bigger// 1m The moment of force of N is lower / smaller// the moment of force of M is bigger / smaller that M is vice versa. 1m b ii. M moves towards the pivot/ fulcrum. c. 1m / 1m 3 1M 6 a. Radiation 1m b. i. note: accept the arrow drawn outside the box. ii. P1: P / black surface / dull surface absorbs more heat ( compare to Q / silver surface/ white surface) P2: Air in conical flask P expand more P3: volume of air in conical P increases more Any 2 P4: ( The air in conical flask P pushes the red ink towards Q) 1m c.Chemical energy heat energy kinetic energy 1m d i. white ii.P1: ( white colour) reflect more heat/ absorb less heat 2m P2: temperature in the house lower/ the condition in the house cooler note : reject any reason relate to black and brown Total: 8 m surface. 4 7 a) P: hydrostatic skeleton 4m Q: endoskeleton R: hydrostatic skeleton S: exoskeleton b, i. aquatic / marine /sea/ ocean reject : water/ any fresh water habitat 1m ii. water support the body weight// ( the body can be supported by ) water buoyancy note: b (ii) is independent of b(i) in condition the answer in b(i) is aquatic habitat. Eg: b (i) = lake(x) b(ii) ; lake water support the body weight (/) P, Q, R and S 4m Hydrostatic exoskeleton skeleton Endoskeleton Total: 10m P, R/ Q S / grasshopper Worm and jellyfish a.i) the air pressure of the tyre of the bus is higher ( than the car)// vice 5 8. versa ii) the higher the size of vehicles the higher the air pressure in the tyre // vice versa// when the size of the vehicles bigger/ increases the air pressure in the tyre increases// vice versa 2m b i) 40 o C = 108 / 108.5/109 50 o C = 112 60 o C = 115 70 o C = 119 4 correct = 2 marks 2-3 correct = 1m 1 correct = 0 m ii) the air pressure /reading of B. gauge depends on/ influence by the temperature. 1m The temperature affects the air pressure // The higher the temperature, the higher the air pressure/ reading of B. Gauge// vice versa As the temperature increases the air pressure increases c. Manipulated variable: temperature( of water) Responding variable: air pressure / B. Gauge reading 2m d. 6 Air Pressure, kPa 120 115 110 105 100 30 40 50 60 70 Temperature, oC Correct all points = 1 m 2m Smooth straight line = 1m e. Air pressure is the reading of Bordon Gauge. 1m Total :10m 7 8