PSLE 2009 - Science

[Fairy]

Augmum:

....(she said that i very \"fann\" asked so many questions) :x
seemed that cannot her ask any more questions.......her answers now are \"Aiya....mummy........please lah........\"

just like what u had said, the only thing now she has in mind is PLAY COMPUTERS GAMES.

Same for my daughter. As far as she is concerned, PSLE is over, she does not wish to discuss any question.... According to her, immediately after HCL, everyone cheered loudly (according to my son last year, the P6 cohort started counting down from the last 10sec. strangely, the invigilator did not stop them). When I asked her if any teacher has discussed with them the answers to the PSLE questions, she said \"No one at school talks about PSLE anymore!\"

They are now busy with preparing for the upcoming bazaar. The school's post-PSLE activities for them include movie screenings, sexuality education, chess enrichment, visits to the Zoo, cinema, Pasir Ris Park, Snow City & etc.

[James Ang]

Augmum:

How about the question regarding the addition of the bulb, any1 can remember the diagram?

This question resembles a Pure Physics O levels MCQ question which shows two bulbs arranged in series and then one additional bulb is connected in parallel arrangement to the first bulb and the question ask what happens to the brightness of the second bulb.

The answer will be the first bulb becomes dimmer and the second bulb becomes brighter. The explanation is that the potential difference for the first bulb and second bulb is the same before the additional bulb is connected in parallel to the first bulb. But when the additional bulb is connected, the potential difference (or voltage) of first bulb is reduced and that of second bulb is increased (since the emf of the battery is the same). The fall in voltage for first bulb is due to the lower combined effective resistance as a result of the parallel arrangement of bulbs. Anyway I ask one of my new student preparing for O levels, and he got that question wrong.

[justsay]

Augmum:

seemed that cannot her ask any more questions.......her answers now are \"Aiya....mummy........please lah........\"



When I asked her if any teacher has discussed with them the answers to the PSLE questions, she said \"No one at school talks about PSLE anymore!\"

haha...that's exactly the same answer I've got when I tried asking just now about the populations in the community.

Yes, I guessed it's about time to stop it and move on. Seems like it's a little late now trying to book tour for the period after result release. So many tell me booking is full. Oh dear.

[justsay]

James Ang:

Augmum:

How about the question regarding the addition of the bulb, any1 can remember the diagram?

This question resembles a Pure Physics O levels MCQ question which shows two bulbs arranged in series and then one additional bulb is connected in parallel arrangement to the first bulb and the question ask what happens to the brightness of the second bulb.

The answer will be the first bulb becomes dimmer and the second bulb becomes brighter. The explanation is that the potential difference for the first bulb and second bulb is the same before the additional bulb is connected in parallel to the first bulb. But when the additional bulb is connected, the potential difference (or voltage) of first bulb is reduced and that of second bulb is increased (since the emf of the battery is the same). The fall in voltage for first bulb is due to the lower combined effective resistance as a result of the parallel arrangement of bulbs. Anyway I ask one of my new student preparing for O levels, and he got that question wrong.

My elder daughter is taking O level this year too. She told me she has just done this question last week from the ten years series.

My stress is not over yet....more to come

[justsay]

James Ang:

Augmum:

How about the question regarding the addition of the bulb, any1 can remember the diagram?

This question resembles a Pure Physics O levels MCQ question which shows two bulbs arranged in series and then one additional bulb is connected in parallel arrangement to the first bulb and the question ask what happens to the brightness of the second bulb.

The answer will be the first bulb becomes dimmer and the second bulb becomes brighter. The explanation is that the potential difference for the first bulb and second bulb is the same before the additional bulb is connected in parallel to the first bulb. But when the additional bulb is connected, the potential difference (or voltage) of first bulb is reduced and that of second bulb is increased (since the emf of the battery is the same). The fall in voltage for first bulb is due to the lower combined effective resistance as a result of the parallel arrangement of bulbs. Anyway I ask one of my new student preparing for O levels, and he got that question wrong.

Newspaper reported the maths paper and also the chinese paper compre passage. Don't be surprise if there is another complain about this question from o level syllabus.

[Augmum]

hi james


thks, i understand what u're trying to explain regarding the question, i just wanna to clarify the exact drawing of the circuit diagram of how the wire connection is made after the addition of the bulb.

pl refer to the previous postings below.

anyway, i think the kids' memory now about any science questions is being replaced by computer games. they are only interested in the very day when they checked answers with their fellow mates. to them whether their answers were correct or not is already a past issue but we parents here are still discussing about the questions.........haha, so funny.....

acelancer:

justsay:

Goto http://www.pslescience.blogspot.com

If the question on adding a bulb parallel to one of the bulbs in series was drawn this way, I would agree that the answer should be (2) would be brighter.

the pic of the adding a bulb parallel to one of the bulbs in series question was not like tht. it was another way... but similar.(a small difference may make a great differrence)

Augmum:

My gal also mentioned the diagram looks different. according to her, the added parallel bulb is in the middle and the connection of the wire is extended and connected to the right side (something like that).

any pupil here remembers the exact diagram drawn.

[kohjl]

kohjl:

Augmum:

any1?? plasmastorm, can u remember the above 2 questions?? thks.

Hi Augmum,
I'll ask PlasmaStorm when he comes home. Hope he can remember...but like I said, he only has computer games on his mind right now! Got to curtail that soon as I don't want him to get addicted...

Asked my son about the questions as requested, but like all the other kids, he also has \"PSLE Amnesia\"! :lol:

[turquoise]

Augmum:

hi james


thks, i understand what u're trying to explain regarding the question, i just wanna to clarify the exact drawing of the circuit diagram of how the wire connection is made after the addition of the bulb.

pl refer to the previous postings below.

anyway, i think the kids' memory now about any science questions is being replaced by computer games. they are only interested in the very day when they checked answers with their fellow mates. to them whether their answers were correct or not is already a past issue but we parents here are still discussing about the questions.........haha, so funny.....

acelancer:

[quote=\"justsay\"]Goto http://www.pslescience.blogspot.com

If the question on adding a bulb parallel to one of the bulbs in series was drawn this way, I would agree that the answer should be (2) would be brighter.

the pic of the adding a bulb parallel to one of the bulbs in series question was not like tht. it was another way... but similar.(a small difference may make a great differrence)

Augmum:

My gal also mentioned the diagram looks different. according to her, the added parallel bulb is in the middle and the connection of the wire is extended and connected to the right side (something like that).

any pupil here remembers the exact diagram drawn.

[/quote]My dd says the diagram is not like the one in the picture too. Her description sounds like your daughter's.

If that is the diagram, then what is the correct answer?

[chk707]

kohjl:

Asked my son about the questions as requested, but like all the other kids, he also has \"PSLE Amnesia\"! :lol:

My son can remember most of the Maths only. For Science, he can't remember a single 1! :lol: :

[Tang]

turquoise:

My dd says the diagram is not like the one in the picture too. Her description sounds like your daughter's.


If that is the diagram, then what is the correct answer?

I think Plasmastorm's answer is correct - The bulb in series will be Brighter.