2010 PSLE Science
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the kiasu student:
It should be shorter what???One of the questions from today's paper was like this:
A 200cm metal rod was heated for 20mins and expanded to a length of 210cm. John took another 200cm metal rod, made of the same type of metal, but thicker. He heated it for 20mins. Will the length of the thicker rod be shorter or longer than 210cm or be the same? Explain.
My answer: Longer. The amount of matter in the thicker rod was more than the amount of matter in the first rod, hence the thicker rod would expand to more than 210cm. :? :? :? :? :? :? :? :? :? :? :? -
MOE Hater:
Does anyone know???!!! :idea:[/quote]
Thot 28 was excluding the egg stage!!!! I put 28! :shock:MOE Hater:
[quote=\"ApronMama\"]
I feel that it is 24 because the question said \"after the egg hatched\" ,so it should not include the time insect x stayedin the egg stage.
:lol: :lol: :lol: -
i think my answers are totally wrong…
could u all see whether it is acceptable?
My answer: he should water the plant daily as with more moisture,decomposition can take place faster.
he could increase the number of holes at the lid so that more oxygen could enter the bin. with more oxygen, the rate of decomposition will be higher.
(i felt that it is totally wrong)…
another thing…about the forest one…what he is thirsty then the plants and fruits could nt be eaten that one… i wrote he could cover the leaves of the plant with the plastic sheet using the string.As the plant repire, it gives off water vapour through its stomato. As the water vapour condenses onto the cooler inner surface of the plastic sheet, it will become water droplets. The boy can drink the water droplets…
and another thing …about the toilet…
i wrote as the plastic bottle occupy space, it will take up some space in the tank, therefore, lesser water is needed to fill up the tank
b) Solid occupies space…(it is wrong?i should write matter right?) -
It should be 10... Read carefully, the graph said that how long did each stage lasted or smth like dat. I am veri confident that it is 10, cus the pupa stage + larva stage for it to reach adult stage. Hence, it is 4+6[/quote]
nono. the stages on the graph are put wrongly. it goes like this. egg, adult, larva, pupa. the pupa has 6 stages. egg has 4 stages like the adult. larva has 18 stages. so 18+6=24 -
ZoeyTan:
Dun be too depress, cheerup. But I am sorry to say that yeah it shud be matter occupies space and he shud not water the dead leaves. But guess wat? ur leaves question is correct!i think my answers are totally wrong....
could u all see whether it is acceptable?
My answer: he should water the plant daily as with more moisture,decomposition can take place faster.
he could increase the number of holes at the lid so that more oxygen could enter the bin. with more oxygen, the rate of decomposition will be higher.
(i felt that it is totally wrong)....
another thing...about the forest one..what he is thirsty then the plants and fruits could nt be eaten that one... i wrote he could cover the leaves of the plant with the plastic sheet using the string.As the plant repire, it gives off water vapour through its stomato. As the water vapour condenses onto the cooler inner surface of the plastic sheet, it will become water droplets. The boy can drink the water droplets..
and another thing ...about the toilet...
i wrote as the plastic bottle occupy space, it will take up some space in the tank, therefore, lesser water is needed to fill up the tank
b) Solid occupies space..(it is wrong?i should write matter right?) -
sam6312:
Dun be too depress, cheerup. But I am sorry to say that yeah it shud be matter occupies space and he shud not water the dead leaves. But guess wat? ur leaves question is correct!ZoeyTan:
i think my answers are totally wrong....
could u all see whether it is acceptable?
My answer: he should water the plant daily as with more moisture,decomposition can take place faster.
he could increase the number of holes at the lid so that more oxygen could enter the bin. with more oxygen, the rate of decomposition will be higher.
(i felt that it is totally wrong)....
another thing...about the forest one..what he is thirsty then the plants and fruits could nt be eaten that one... i wrote he could cover the leaves of the plant with the plastic sheet using the string.As the plant repire, it gives off water vapour through its stomato. As the water vapour condenses onto the cooler inner surface of the plastic sheet, it will become water droplets. The boy can drink the water droplets..
and another thing ...about the toilet...
i wrote as the plastic bottle occupy space, it will take up some space in the tank, therefore, lesser water is needed to fill up the tank
b) Solid occupies space..(it is wrong?i should write matter right?)
then how about the oxygen one? and the toilet a)? -
ZoeyTan:
Dun be too depress, cheerup. But I am sorry to say that yeah it shud be matter occupies space and he shud not water the dead leaves. But guess wat? ur leaves question is correct!sam6312:
[quote=\"ZoeyTan\"]i think my answers are totally wrong....
could u all see whether it is acceptable?
My answer: he should water the plant daily as with more moisture,decomposition can take place faster.
he could increase the number of holes at the lid so that more oxygen could enter the bin. with more oxygen, the rate of decomposition will be higher.
(i felt that it is totally wrong)....
another thing...about the forest one..what he is thirsty then the plants and fruits could nt be eaten that one... i wrote he could cover the leaves of the plant with the plastic sheet using the string.As the plant repire, it gives off water vapour through its stomato. As the water vapour condenses onto the cooler inner surface of the plastic sheet, it will become water droplets. The boy can drink the water droplets..
and another thing ...about the toilet...
i wrote as the plastic bottle occupy space, it will take up some space in the tank, therefore, lesser water is needed to fill up the tank
b) Solid occupies space..(it is wrong?i should write matter right?)
then how about the oxygen one? and the toilet a)?[/quote]U didnt say that the stones make the plastic bottle heavier... Cus if u put plastic bottle the water will just float on the surface. Then, the oxygen wan... maybe can. There are alternatives to answers in PSLE espacially science, so dun worry go on and celebrate if u do not hav HCL 2morrow. Sad to say, I do. -
sam6312:
U didnt say that the stones make the plastic bottle heavier... Cus if u put plastic bottle the water will just float on the surface. Then, the oxygen wan... maybe can. There are alternatives to answers in PSLE espacially science, so dun worry go on and celebrate if u do not hav HCL 2morrow. Sad to say, I do.[/quote]o ok thanksZoeyTan:
[quote=\"sam6312\"]
Dun be too depress, cheerup. But I am sorry to say that yeah it shud be matter occupies space and he shud not water the dead leaves. But guess wat? ur leaves question is correct!
then how about the oxygen one? and the toilet a)?
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Can someone check if the decomposition question, can the bin be placed in the dark to speed up decomposition?
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mum-in-action:
It should be 10... Read carefully, the graph said that how long did each stage lasted or smth like dat. I am veri confident that it is 10, cus the pupa stage + larva stage for it to reach adult stage. Hence, it is 4+6
nono. the stages on the graph are put wrongly. it goes like this. egg, adult, larva, pupa. the pupa has 6 stages. egg has 4 stages like the adult. larva has 18 stages. so 18+6=24[/quote]
ya, it is 24.
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