Q&A - PSLE Science

[Alchemist]

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.

[andante]

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.

[Publica]

vidhyalog:

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.

[ms_lim]

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

Thank you tianzhu and Millan for the clarification.

[ms_lim]

andante:

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.

[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?