2010 PSLE Science

[ChiefKiasu]

snowman.697:

Mass = how much space a certain object occupies. Isn't that vol.?

Matter does not necessarily occupy space. A black hole has a huge mass cramped into an infinitesimally small point. What we know is that matter is gravitionally attracted to other matter, giving it the impression of \"weight\", which is really the force that pulls matter together.

[atutor2001]

Sun_2010:

atutor2001:

[quote=\"anon123\"]I want to know ans for qns 34

It's about 'someone' is in a jungle,all the fruits and plants cant be eaten he only have the following items to produce drinkable water:
.Plastic Sheet
.Newspaper
.Towel
.String

What should he do?

Help me with this qns pls..... :idea:

I think my earlier answer is wrong. The towel and newspaper is to be used as filter. The answer may be in this link :

http://adventure.howstuffworks.com/survival/wilderness/jungle-survival2.htm

O, oh!

but to filter thru towel means lot of water needs to be collected. say 200 ml atleast. Other wise the towel would soak up most of the water.

newspaper if used as filter may just tear.

hmm...[/quote]Yes, we would need subsequent amount of water to filter and there should be water in a jungle because there are trees - implying there is water.

Normal science assessment books always give example of how to collect water in a desert, so we mistaken that this question is based on scenario of \"no water\".

Based on what I gathered from the posting, the question did not state that there is no water, rather there is a need to \"produce\" DRINKABLE water.

The plastic sheet can be folded to form the \"funnel\", the towel can be used to be the coarse filter medium and newspaper acting as the filter paper we use to line the funnel in the lab.

[RainyDay]

atutor2001:

Sun_2010:

[quote=\"atutor2001\"]
I think my earlier answer is wrong. The towel and newspaper is to be used as filter. The answer may be in this link :

http://adventure.howstuffworks.com/survival/wilderness/jungle-survival2.htm

O, oh!

but to filter thru towel means lot of water needs to be collected. say 200 ml atleast. Other wise the towel would soak up most of the water.

newspaper if used as filter may just tear.

hmm...

Yes, we would need subsequent amount of water to filter and there should be water in a jungle because there are trees - implying there is water.

Normal science assessment books always give example of how to collect water in a desert, so we mistaken that this question is based on scenario of \"no water\".

Based on what I gathered from the posting, the question did not state that there is no water, rather there is a need to \"produce\" DRINKABLE water.

The plastic sheet can be folded to form the \"funnel\", the towel can be used to be the coarse filter medium and newspaper acting as the filter paper we use to line the funnel in the lab.[/quote]Wa heng ah i was dumbfounded by that question but luckily i put collect rain water

[Learner1234]

Help everyone, is an earthworm a decomposer? I found different answers on the Internet. Some sites say yes, some say no. So yes or no?

[atutor2001]

Learner1234:

Help everyone, is an earthworm a decomposer? I found different answers on the Internet. Some sites say yes, some say no. So yes or no?

It is NOT a decomposer. It is a helper of decomposer.

A decomposer breaks down dead organism to SIMPLE substances.

A helper of decomposer breaks down dead organism into SMALLER pieces.

[James Ang]

Learner1234:

Help everyone, is an earthworm a decomposer? I found different answers on the Internet. Some sites say yes, some say no. So yes or no?

only bacteria and fungi are decomposers.

[anonymus]

Learner1234:

Help everyone, is an earthworm a decomposer? I found different answers on the Internet. Some sites say yes, some say no. So yes or no?

Hi friend,
If u r referring 2 the qt asked in PSLE, it was
\"How 2 increase the rate of decomposition\"

Yr ans (As 4 as i know) is correct. Adding insects like termites n earthworms the rate of decomposition can b faster.Right ??? Any expert comments?

[Tapeworm]

anonymus:

Learner1234:

Help everyone, is an earthworm a decomposer? I found different answers on the Internet. Some sites say yes, some say no. So yes or no?

Hi friend,
If u r referring 2 the qt asked in PSLE, it was
\"How 2 increase the rate of decomposition\"

Yr ans (As 4 as i know) is correct. Adding insects like termites n earthworms the rate of decomposition can b faster.Right ??? Any expert comments?

hi, yeah that's what i put too. i put 1. poke more holes (more oxygen) then 2. add an earthworm that will increase the rate of decomp

[Almighty]

Tapeworm:

anonymus:

[quote=\"Learner1234\"]Help everyone, is an earthworm a decomposer? I found different answers on the Internet. Some sites say yes, some say no. So yes or no?

Hi friend,
If u r referring 2 the qt asked in PSLE, it was
\"How 2 increase the rate of decomposition\"

Yr ans (As 4 as i know) is correct. Adding insects like termites n earthworms the rate of decomposition can b faster.Right ??? Any expert comments?

hi, yeah that's what i put too. i put 1. poke more holes (more oxygen) then 2. add an earthworm that will increase the rate of decomp[/quote]HI Tapeworm,
Your answer is correct (Earthworm)

[sam6312]

snowman.697:

Mass = how much space a certain object occupies. Isn't that vol.?

No, refer to ur science guide. And guys, y still tok abt PSLE?