Q&A - PSLE Science
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charsen:
My DD's answer - use the hair dryer to dry the plates. Is this answer acceptable?
HiRecia Lim:
This question comes from PSLE booklet (Year 2007-2011) pg 122 Q24.b
Other than using a cloth to wipe the plates, suggest one way to make the plates dry even faster.
This question is testing you on your knowledge of factors affecting rate of evaporation.The factors are wind,temperature,exposed surface of the area and the humidity level in the air.Out of these,humidity and exposed surface area is ruled out as you cannot do anything with humidity and exposed surface area was mentioned in part a.Temperature is not possible to tell as if you put these plates in the microwave oven for example,and heat up for 20 seconds,the possible cause is although the plates would be dried,it would crack due to expansion of the plates.Wind,yes.The possible answer could be:
Place a fan beside the plates to dry them even faster.
Hope my explanation helps.
Cheers -
homeworkmummy:
My DD's answer - use the hair dryer to dry the plates. Is this answer acceptable?[/quote]Hi
Hicharsen:
[quote=\"Recia Lim\"]This question comes from PSLE booklet (Year 2007-2011) pg 122 Q24.b
Other than using a cloth to wipe the plates, suggest one way to make the plates dry even faster.
This question is testing you on your knowledge of factors affecting rate of evaporation.The factors are wind,temperature,exposed surface of the area and the humidity level in the air.Out of these,humidity and exposed surface area is ruled out as you cannot do anything with humidity and exposed surface area was mentioned in part a.Temperature is not possible to tell as if you put these plates in the microwave oven for example,and heat up for 20 seconds,the possible cause is although the plates would be dried,it would crack due to expansion of the plates.Wind,yes.The possible answer could be:
Place a fan beside the plates to dry them even faster.
Hope my explanation helps.
Cheers
Yes.It is acceptable.As long you mention a electrical appliance which gives off wind,it is acceptable.Because the wind helps to increase the rate of evaporation.
cheers -
homeworkmummy:
My DD's answer - use the hair dryer to dry the plates. Is this answer acceptable?[/quote]
Hicharsen:
[quote=\"Recia Lim\"]This question comes from PSLE booklet (Year 2007-2011) pg 122 Q24.b
Other than using a cloth to wipe the plates, suggest one way to make the plates dry even faster.
This question is testing you on your knowledge of factors affecting rate of evaporation.The factors are wind,temperature,exposed surface of the area and the humidity level in the air.Out of these,humidity and exposed surface area is ruled out as you cannot do anything with humidity and exposed surface area was mentioned in part a.Temperature is not possible to tell as if you put these plates in the microwave oven for example,and heat up for 20 seconds,the possible cause is although the plates would be dried,it would crack due to expansion of the plates.Wind,yes.The possible answer could be:
Place a fan beside the plates to dry them even faster.
Hope my explanation helps.
Cheers
As question states \"dry even faster\", my suggested answer is: Use a plate dryer. -
Sorry for posting the wrong questions!
Charsen, this question is super tricky,
Is it (1) or (2), I stucked at the shape B and C.
Link:
http://t.co/4rJYMpyB
Pls explain.
I have difficulty doing the next question, I did not learn about water filtering before, so can you explain.
Link:
http://t.co/2jAm71ow
:scratchhead: -
ms_lim:
Charsen, thanks so much for your explanation.[/quote]Sorry Charsen and Ms_lim. I would like to ask, why is it that the 1st container would not survive? There is air water and light for the plant, so why is it that the organisms in the 1st container will not survive? Sorry to disturb!thanks.
Hicharsen:
[quote=\"ms_lim\"]Can help to explain this question? Ans key is 1
![](\"http://i50.tinypic.com/nt2k4.jpg\")
http://i50.tinypic.com/nt2k4.jpg\">
Your DS answer which is 3,is correct.Option 4 is not the answer as the snails may have eaten up the plant.You can say option 4 when they show the observation in each day that the snails is eating the plant.I would say not possible to tell.
Option 1;Double confirm it is wrong.Only plants,not animals,need light to survive.
Option 2 is wrong as we do not know whether snails eat plants.That also comes under not possible to tell.
Thus,answer 3 is correct.
Cheers -
Michaelia0816:
Sorry for posting the wrong questions!
Charsen, this question is super tricky,
Is it (1) or (2), I stucked at the shape B and C.
Link:
http://t.co/4rJYMpyB
Pls explain.
Link:
http://t.co/2jAm71ow
:scratchhead: -
Michaelia0816:
HiMichaelia0816:
Sorry for posting the wrong questions!
Charsen, this question is super tricky,
Is it (1) or (2), I stucked at the shape B and C.
Link:
http://t.co/4rJYMpyB
Pls explain.
Link:
http://t.co/2jAm71ow
:scratchhead:
First question.You know that the nearer the object is near the light source,the bigger the shadow casted.In this case,the ring is big.Thus,A should be the ring.The next biggest is the rectangle reason is if a shape lies on the rectangle shadow,it means the rectangle is bigger.Answer is 2.
Second question.Topic:environment Concept:types of soil
a)The spaces between the large sand particles in setup A are larger than the small sand particles,so water can flow more quickly through the sand particles in set-up A and can be collected in the beaker.
b)Beng Hock wanted to trap the smaller impurities present in the water from the river which could only be done using the find sand as the space between the sand particles are smaller and trap the impurities.
c)No.Clear water can still contain harmful micro organisms like bacteria that can harm us when we drink the water.
Cheers -
Hi Robertpattinsonidle
In the night,both the snails and the water plant would compete for dissolved oxygen.Since this would happen for a month,the snails would eventually die before the water plants die.There would be more dissolved oxygen than dissolved carbon dioxide ,thus the plants would die due to the lack of dissolved oxygen.
Cheers -
ms_lim:
(1) Living things need light to survive. --- Wrong since organisms in P do not survive after 1 month.Can help to explain this question? Ans key is 1
(2) Living things need food to survive --- Wrong since Q shows that plants make their own food (in the presence of light).
(3) Plants can make food in the presence of light --- Correct Q vs S.
(4) There is insufficient dissolved oxygen in the water - Wrong since the plants in Q survive after 1 month.
So the correct answer is (3). -
In terms of food storage, how is a carrot plant different from a ginger plant?
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