Q&A - PSLE Science

[Alchemist]

Publica:

vidhyalog:

[quote=\"tisha\"]http://i53.tinypic.com/33wxv7o.jpg\">


This Q is from RGPS Q21 Prelim 2011.

The answer key says 1 (C only) as the answer. Could someone confirm this and explain why? :please:

My son said B&C. As we do not know how much water was there before the ruler was put in - we cannot find A.

Hi,
The answer should be C only. Since A was not fully submerged in the water, we cannot find the volume of B when both A and B are put into the beaker.[/quote]Hi Publica - Thanks for highlighting that. It makes sense now. My husband and I both missed that point too. Now I know where you son gets his smarts from

[ms_lim]

andante:

Hi,

For the question below, shouldn't the answer be (4) which is fleshing eating bird ?
http://i52.tinypic.com/2ij1a37.jpg\">

Dear andante, I am not sure if anyone has clarified this question. My dd's ans is also (4).

[vlim]

ms_lim:

andante:

Hi,

For the question below, shouldn't the answer be (4) which is fleshing eating bird ?
http://i52.tinypic.com/2ij1a37.jpg\">

Dear andante, I am not sure if anyone has clarified this question. My dd's ans is also (4).

Ds said 4 also

[ms_lim]

vlim:

ms_lim:

[quote=\"andante\"]Hi,

For the question below, shouldn't the answer be (4) which is fleshing eating bird ?
http://i52.tinypic.com/2ij1a37.jpg\">

Dear andante, I am not sure if anyone has clarified this question. My dd's ans is also (4).

Ds said 4 also [/quote] :thankyou: vlim

[Nebbermind]

millan:

ms_lim:

Need help to explain for part (c) of this question :

http://i56.tinypic.com/148p2ec.jpg\">
Ans key : chemical potential engergy --> Kinetic energy + Sound energy
My dd's ans : Kinetic energy --> Heat sound + Sound energy

There is Chemical Potential Energy as the energy that is used to push the ball comes from the person pushing it, as Chemical potential energy = the energy stored inside our body, so the person who pushes the ball converts the CPE stored in his body -> KE -> SE (We can hear the sound when the ball hits the bowling ball down. If there is and extra box, put heat energy

Hope this helps

I don't agree with your answer. This is a 'force' qn, not an 'energy' qn. Is this from a asessment book or past yr ppr?

[andante]

ms_lim:

andante:

[quote=\"vidhyalog\"]
for Q3 - my son reasoned that the female reproductive cell should be the egg - and this cell is housed in the ovule. I will try and post the Q on KSP to see what other parents say.

You are right that the question is about the cell so I think it should be egg lor.

Dear Andante and vidhyalog, my dd argue that there is no egg in plant but only ovule.[/quote]Hi ms_lim,
Thx for your clarification. \"paiseh\", no wonder my dd insisted on the answer(2) i.e. ovule

[Vanilla Cake]

ms_lim:

Need help to explain for part (c) of this question :

http://i56.tinypic.com/148p2ec.jpg\">
Ans key : chemical potential engergy --> Kinetic energy + Sound energy
My dd's ans : Kinetic energy --> Heat sound + Sound energy

millan:

There is Chemical Potential Energy as the energy that is used to push the ball comes from the person pushing it, as Chemical potential energy = the energy stored inside our body, so the person who pushes the ball converts the CPE stored in his body -> KE -> SE (We can hear the sound when the ball hits the bowling ball down. If there is and extra box, put heat energy

Hope this helps

Nebbermind:

I don't agree with your answer. This is a 'force' qn, not an 'energy' qn. Is this from a asessment book or past yr ppr?

From Edgefield Primary School 2011 P6 Prelim Science set on 25 August 2011.

[andante]

Hi,

pls help on the following question as my dd thinks that there is no right answer given. TIA.
http://i54.tinypic.com/20iymhw.gif\">

[tisha]

Publica:

vidhyalog:

[quote=\"tisha\"]

This Q is from RGPS Q21 Prelim 2011.

The answer key says 1 (C only) as the answer. Could someone confirm this and explain why? :please:

My son said B&C. As we do not know how much water was there before the ruler was put in - we cannot find A.

Hi,
The answer should be C only. Since A was not fully submerged in the water, we cannot find the volume of B when both A and B are put into the beaker.[/quote]Thankyou Publica for the clear explaination.

[Alchemist]

Dear Andante and vidhyalog, my dd argue that there is no egg in plant but only ovule.[/quote]

Hi ms_lim,
Thx for your clarification. \"paiseh\", no wonder my dd insisted on the answer(2) i.e. ovule :)[/quote]


Hi - I got this from one of the text books. In the diagram - the ovule is shown to contain egg cell. Would appreciate if anyone else could help clarify. http://i53.tinypic.com/33f3odt.jpg\">

Thanks