Q&A - PSLE Science
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Charsen,
1)![](\"http://i45.tinypic.com/9kvvgn.jpg\")
http://i45.tinypic.com/9kvvgn.jpg\">
Explain your answer in (a).
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2)
http://t.co/4YkPbS51
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3)
http://t.co/5JdTXHnk
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4)
http://t.co/MdP20oDI
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5)
http://t.co/oHVJRRHU
My apologies, it should be 5 more questions instead of 4.
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[quote=\"Michaelia0816\"]Charsen,
1)
Explain your answer in (a).
--------------------------------------------------------------------------------------
2)
http://t.co/4YkPbS51
--------------------------------------------------------------------------------------
3)
http://t.co/5JdTXHnk
--------------------------------------------------------------------------------------
4)
http://t.co/MdP20oDI
--------------------------------------------------------------------------------------
5)
http://t.co/oHVJRRHU
My apologies, it should be 5 more questions instead of 4. :sweat[quote]
Hi
Link 2:Answer is (3).Weight is caused by the force of gravity acting on it and thus,your mass will not change if you are on the moon but the weight does change.
Link 3:Answer is (3).Independent variable is exposed surface area.Dependent
variable is time taken for each towel to dry.Independent variable should always be at the x axis and the dependent variable will always be at the y axis.
Link 4:Answer is (1).The hot plate is a heat source which heats the water and cause it to evaporate.the sun's role in the water cycle is almost the same as the hot plate.The water droplets cannot be condensation,thus it should be rain as it falls from the clear plastic sheet.
Link 5:Answer is (1).(A) cannot be in the answer as Set-up R will take a longer time to heat up since there is more water in the container will result in more heat to boil.(b) cannot be the answer as when the water in both set-ups are in the same temperature,water in set-up r would have more heat than the other set-up.
For link 1, what do you man by explain in (a).There is no (a) in the question.
cheers -
Thx, I kind of bad at this, >.<
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ACS 2011 Prelim Paper, Section B, Q41:
![](\"http://i49.tinypic.com/2h3btzd.jpg\")
(b) Farmer Amos noticed that his maize plantation has been infested by rats. Without introducing any new species into the above food web, suggest a suitable and sage method that can help him overcome this problem.
Marking Scheme:
- Introduce owls into the community (1)
- Introduce snakes (0)
- Introduce snakes & owls (0)
Why is \"Introduce snakes\" getting a 0 marks since snakes will eat up the rats?
TIA! -
its888me:
ACS 2011 Prelim Paper, Section B, Q41:
(b) Farmer Amos noticed that his maize plantation has been infested by rats. Without introducing any new species into the above food web, suggest a suitable and sage method that can help him overcome this problem.
Marking Scheme:
- Introduce owls into the community (1)
- Introduce snakes (0)
- Introduce snakes & owls (0)
Why is \"Introduce snakes\" getting a 0 marks since snakes will eat up the rats?
TIA!
can someone help?
Many thanks! -
its888me:
I think the highlighted word is safe .ACS 2011 Prelim Paper, Section B, Q41:
(b) Farmer Amos noticed that his maize plantation has been infested by rats. Without introducing any new species into the above food web, suggest a suitable and sage method that can help him overcome this problem.
Marking Scheme:
- Introduce owls into the community (1)
- Introduce snakes (0)
- Introduce snakes & owls (0)
Why is \"Introduce snakes\" getting a 0 marks since snakes will eat up the rats?
TIA!
That is why cannot be more snakes ? -
its888me:
HiACS 2011 Prelim Paper, Section B, Q41:
(b) Farmer Amos noticed that his maize plantation has been infested by rats. Without introducing any new species into the above food web, suggest a suitable and sage method that can help him overcome this problem.
Marking Scheme:
- Introduce owls into the community (1)
- Introduce snakes (0)
- Introduce snakes & owls (0)
Why is \"Introduce snakes\" getting a 0 marks since snakes will eat up the rats?
TIA!
In my point of view,introducing the snakes would harm other useful animals in the plantation.Not only that,the owl population would also increase,so you can say that both populations would compete for food,which results in the decrease in the number of snakes only.
cheers
Cheers -
Hi,
Need help on this qn from CHS prelim :
![](\"http://i46.tinypic.com/1zp03fb.jpg\")
Answer in answer key is (2). dd's ans is (1) ?? (I think ans key is wrong, need some advices. Thanks!) :?: -
there is only one hole for both water and air to escape. hence the hole is not enough for the air to leave and enter to push the water out. this results in blockage and hence the milk flows out slowly. the second part to this qsn is how to increase flow of milk so u can say that poke another hol and the explanation is that in one hole milk can flow out and in the other air can enter to occupy the space and also push the milk out hence increasing rate of milk flow.
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Need some help as don’t understand why this is false?
When a ball reaches its max height, the force of gravity acting on the ball is the greatest.
Tks
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