Q&A - PSLE Science

[Nebbermind]

TZ


I thought it shd be (3) for water vs air…donch think air shd e ‘0’.

[tianzhu]

Nebbermind:

TZ


I thought it shd be (3) for water vs air...donch think air shd e '0'.

Hi

The markings on the sliding indicator show the distance travelled by the plunger of the syringe. I think there is still small space at the tip of the syringe when the plunger reaches zero.

When one press as hard as possible, it’s possible to reach the zero mark.

Watch this video and observe the position of the plunger when the guy applies force.

http://www.blinkx.com/watch-video/the-fire-syringe/GOZmVBYHqBNU8khxc2Ug3g

Best wishes

[ivanhoo99]

Why do we sweat?

I need a full proper answer…
Thank you

[tianzhu]

ivanhoo99:

Why do we sweat?

Hi

This link may help.

http://www.fros-t.com/uploads/How_does_sweat_work.pdf

Best wishes

[P5G]

Please help.


http://www.orlesson.org/orp/10Sc/2010-P6-Sc-SA2-CHS.pdf


Should the answer for question 9 about photosynthesis be (4) instead of (2) as given?

Please advise how to get the answers for questions
14 - seedlings
17 - ring magnets
23 - water - evaporation
27 - friction.


TIA.

[tianzhu]

Hi P5G


For Q9, I have the same answer as you.

For Q14, going through elimination, I’d weed out

Option(1) — The similar seedlings are used not different ones
Option (3) — From the question, we can infer that the seedlings in the garden soil grow well, there is no sign of water deficiency.
Option(4) is out as they do affect the growth rate.

I’d go for option (2) as can be seen from the data, seedlings in garden soil grow faster.(1.5 to 14.4 as compared to 3.1 to 14.8)

For Q17, I believe you just want to confirm the answer, it is option (1), we cannot conclude that Disc Z is non magnetic.

Best wishes

[Nebbermind]

Q27 - (4) S.

[Vanilla Cake]

Pls help on these 2 MCQs from http://www.orlesson.org/orp/10Sc/2010-P6-Sc-SA2-CHS.pdf:


Q23 - Pls go to page 15/40. Answer given is option (1) but I think it should be option (2)
Q29 - Pls go to page 20/40. Answer given is option (4) but I think it should be option (3)

Pls advise the correct answers and thanks for your helpful response.

[Sun_2010]

Vanilla cake,


My 2 cents…
15 is definitely 2
20 - option A cannot be right, If i want to see clearly , i would use a black board not white for the screen.
so by elimination , 4 is the answer

Lets wait for the experts to comments

[Full.010894Cream]

Sun_2010:

Vanilla cake,


My 2 cents..
15 is definitely 2
20 - option A cannot be right, If i want to see clearly , i would use a black board not white for the screen.
so by elimination , 4 is the answer

Lets wait for the experts to comments

Sorry, r u confusing Qn with Pg? It is Q23 on Pg15 & Q29 on Pg20