Seperti yang Cikgu janjikan, bersam ini cikgu serta cadangan jawapan kepada latihan yang telah Cikgu berikan semasa sesi program kita di Yayasan Selangor tempohari.. Selamat Menjawab dan selamat menyemak jawapan..
| 1 | a | i | L: 455 gram N: 435 gram
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| ii | The weight of potometer in condition M is less than condition N |
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| iii | The weight of potometer is getting lesser because water is loss by transpiration |
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| b |
| Manipulated variables: Condition of the apparatus Responding variables: Weight of potometer at the end of experiment// Final weight of potometer |
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| c | i | The higher the speed of fan, the lower the final weight of the potometer |
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| ii | Less than 425 (accept any number below 425) |
| 2 | a | i | L – 36 N – 88 |
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| ii | The color of distillate in fraction 2 is lighter than the distillate in fraction 3 Distillate in fraction 2 is light yellow but in fraction 3 is yellow |
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| iii | The higher the reading of the temperature, the darker the color of the distillate As the boiling point increases, the color of the fraction become darker |
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| b |
| Manipulated variable : temperature Responding variable : distillate colour |
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| c | i | As the boiling point gets higher, more soot is produced because the fraction becomes less combustible As the boiling point gets higher, more soot is produced because more carbon As the boiling point gets higher, more soot is produced because less oxygen Soot produce increase because the boiling point increase |
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| ii | Darker than yellow brown |
| 1 | a | i | The clothes in Condition A dry faster than in Condition B |
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| ii | Time taken for the clothes to dry in condition A is faster because the presence of sunlight/ surrounding temperature |
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| iii | The higher the temperature, the faster the cloth dry// As the temperature high, the cloth dry faster. |
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| b |
| With heat sources – 10 Without heat sources - 25 |
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| c |
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| d |
| Drop of water on cobalt chloride paper with heat source dry faster compare to without heat source// Vice versa |
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| e |
| The higher the temperature of surrounding the higher the rate of evaporation |
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| Manipulated V – Present of heat source// lamp Responding V – Time taken for the (cobalt chloride) paper to dry Constant V – Size of cobalt chloride paper// Number of drop of water/ Volume of water drops
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| 2 | a |
| The air pressure in the tyre increase because the temperature increase |
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| b |
| 40 c – 107 60 c –114 80 c – 121 100 c –128 |
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| c | i ii | Manipulated : Temperature Responding : Air pressure |
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| e | i | 93 c (+-) |
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| ii | The higher the temperature the higher the air pressure When the temperature increase the air pressure increase |
| 3 | a | i | Bus B |
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| ii | The passengers in bus B will feel more warm during hot day because the bus is black in color and will absorb more heat |
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| b | i | Black and dull – 75 c White and shiny – 45 c |
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| ii | Bar chart |
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| iii | Manipulated : color of object Responding : final temperature Constant : initial temperature |
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| iv | The darker the color of an object, more heat will absorb |
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| v | The absorption of heat is the final thermometer reading |
| 4 | a | i | The size of sugar cube is smaller because the temperature is higer |
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| ii | The higher temperature of water, the smaller the size of sugar cube/ vise versa. Semakin tinggi suhu air, semakin kecil saiz gula kiub / sebaliknya
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| b | i | 48sec
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| ii | Manipulated variable : temperature of water / suhu air Responding variable : time taken to fine sugar dissolve /masa yang diambil untuk gula halus larut |
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| c |
| The higher temperature of water, the shorter time taken for sugar dissolves. Vice versa. Semakin tinggi suhu air, semakin singkat masa diambil untuk gula melarut. sebaliknya |
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| d |
| (37+1sec) |
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| e |
| The rate of dissolving is the time taken for sugar to dissolve (at different temperature). Kadar keterlarutan ialah masa yang diambil untuk gula melarut pada suhu yang berbeza. |
| 5 | a | i | Set A |
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| Ii | To lower the melting point of the ice cubes |
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| Iii | Mixture of solid and liquid |
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| b | i | 0ºC |
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| Manipulated : time Responding : temperature |
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Pure water freezes at 0ºC |
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| Pure water: T // distillation Impure water: S, U, V // filtration, boiling, chlorination *accept either letters or names |
| 8 | a |
| Q wilted because there is no water P looked fresh because there is water |
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| i | 5.4 |
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| iii | The light intensity is the greatest factor that affect the reading of the position of the air bubble
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| iv | Light/moving air |
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| v | Air movement increase the reading of the position of the air bubble |
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| vi | 7.2 |
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| The higher the speed of the moving fan, the higher the position of air bubble |
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| vii | The rate of transpiration is the position of the air bubble |
| 8 | a | i | The grasshopper in J died but the grasshopper in K is still alive |
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| ii | The grasshopper in J died because there is no air The grasshopper in K still alive because there is air/oxygen
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| b | i | 11 |
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| ii | More than 11 |
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| c |
| The bigger the size of container, the longer the time taken for the candle to extinguish |
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| d |
| the time taken for the candle to extinguish
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| e |
| Less than 5s 0 not accepted |
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| f |
| Combustion is the the time taken for the candle to extinguish
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| 8 | a | i | Work done in situation L is less than work done in situation M |
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| ii | The heavier the bag, the more time taken to lift the bag |
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| iii | Bag in situation L is lighter than in M because the time taken to lift it is shorter |
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| b | i | 250 |
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| iii | The reading of the spring balance is directly proportional to the mass of the weight The higher the mass of the weight, the higher the reading of spring balance |
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| iv | Responding : reading of spring balance Manipulated: mass of the weight |
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| c | i | Work done is time taken to lift the bag |
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| ii | Work done : S, U No work done : T, W |
