PSLE 2009 - Science

[kohjl]

the ME:

Aya:

What did everyone put for the first question? Some people in my class say that the ans is either 2. Stomach or 3. Small Intestines.


And how about the last question for Booklet B? That one was tough...

So, how many questions have everyone confirmed wrong for Booklet A? For me, already 2 questions Overall, I don't think the paper was easy at all... of course an exception for the science freaks out there.

I wrote small intestine. I think it's wrong T.T The last question I guessed and checked. Was alright.

The Question:
Which is the organ with the most digested food.

My answer:
Small intestine.

From: kohjl Jr

P/S - Going for dinner, so offline this evening.

[kohjl]

mathsparks:

hi kohjl jr,

I'm so impressed with your answers. :congrats: You will surely get into the school of your choice. Go tell yr mumsy no worries!

Hi mathsparks

FINALLY got my A/C back.... my son had hijacked it for most of this evening. He wanted to answer just one or two questions, but got carried away.

That's fine with me...helped to \"bump up\" my post ratings... :lol:
Thanks, mathsparks for yr well-wishes!

Regards.
kohjl
(The mother)

[friendlymom]

My son - Oxygen and water

Hello:

What are the need(s) for a bread to turn mouldy?

(A)Oxygen
(B)Can't remember
(C)Water.

Its something like that.

[friendlymom]

small intestines

Aya:

What did everyone put for the first question? Some people in my class say that the ans is either 2. Stomach or 3. Small Intestines.

And how about the last question for Booklet B? That one was tough...

So, how many questions have everyone confirmed wrong for Booklet A? For me, already 2 questions Overall, I don't think the paper was easy at all... of course an exception for the science freaks out there.

[emerald]

shinystars:

kohjl:

[quote=\"acelancer\"]
i put 4.

Please click on the picture at the bottom to see Diagram for a clearer explanation.

I’ve labeled the bulbs as A and B because I can’t remember what letters the examiners had put.

The Question:
Bulb B is shining at a light intensity of 10 units. After pushing the button, bulb B
1) would not light up.
2) would become brighter.
3) would become dimmer.
4) brightness would remain the same.

My answer: 2

My reason: 1 Battery gives 10 units of electricity. After pushing the button, the lever will move up and touch the upper point. As the 3 batteries are now connected with the bulbs, each bulb has 15 units of electricity flowing through them. Since 15 units is more than 10 units, bulb B becomes brighter.

From: kohjl Jr

http://www.postimage.org/image.php?v=Ts159blJ

actually i meant the mcq with the total of 3 bulbs, not the metal rod question. The question that asks: If one more bulb is added to the circuit, what would happen to the brightness of the first bulb which was arranged in series? :idea:[/quote]Diagram doesn't seem to be the same as the one in exam. Ans provided also different, right?

[friendlymom]

:celebrate: my son also \"all of the above\" !!

kohjl:

MummyJamie:

[quote=\"caroline3sg\"]mummyjamie & sahimi

my girl said biceps/triceps (is labelled as one letter) & the other one is the fulcrum - the elbow. So it is P & R?

I think so

The Question is:
The diagram shows a man exercising by raising a dumbell. Which of the following are needed for this action?
a) The biceps and the triceps
b) The elbow
c) The lower arm (bone)

My answer: All of the above.
Reason: The lower and upper arms are like levers. The elbow is the fulcrum, the muscles apply the effort and the lower arm is part of the lever. So, you need all three!

From: kohjl Jr :D[/quote]

[JHFMum]

justsay:

sunshine:

son said more difficult than Math..any comments from other parents??

Daughter said wasnt easy if think through the question properly. It's tricky.

Same here. Daughter said paper is tricky. Needs to be careful when answering questions.

[Randomer]

emerald:

shinystars:

[quote=\"kohjl\"]Please click on the picture at the bottom to see Diagram for a clearer explanation.


I’ve labeled the bulbs as A and B because I can’t remember what letters the examiners had put.

The Question:
Bulb B is shining at a light intensity of 10 units. After pushing the button, bulb B
1) would not light up.
2) would become brighter.
3) would become dimmer.
4) brightness would remain the same.

My answer: 2

My reason: 1 Battery gives 10 units of electricity. After pushing the button, the lever will move up and touch the upper point. As the 3 batteries are now connected with the bulbs, each bulb has 15 units of electricity flowing through them. Since 15 units is more than 10 units, bulb B becomes brighter.

From: kohjl Jr

http://www.postimage.org/image.php?v=Ts159blJ

actually i meant the mcq with the total of 3 bulbs, not the metal rod question. The question that asks: If one more bulb is added to the circuit, what would happen to the brightness of the first bulb which was arranged in series? :idea:

Diagram doesn't seem to be the same as the one in exam. Ans provided also different, right?[/quote]Im new in this forum. I think what he/she meant was the question with bulbs P,Q and R. P and Q are arranged in series but an additional R is added on below in parallel arrangement with an open switch beside it.

The question asks, if the switch is closed, what will happen to the brightness of P?
I put as bright as before for P as bulb R is added on in parallel arrangement and therefore it will not affect the brightness. Not sure...

[ChiefKiasu]

kohjl:

... FINALLY got my A/C back.... my son had hijacked it for most of this evening. He wanted to answer just one or two questions, but got carried away.


That's fine with me...helped to \"bump up\" my post ratings... :lol: ...

You have a very promising son, kohjl. Not because of his excellent answers to the questions, but his humble demeanor that conveys a maturity beyond his age. There was none of that unbridled \"I-win-you-lose\" lip displayed by some of the other kids after the math exam last week.

It gives me great hope and confidence that we locally-bred Singaporeans are going to have a future in our own country.

[caroline3sg]

ChiefKiasu:

kohjl:

... FINALLY got my A/C back.... my son had hijacked it for most of this evening. He wanted to answer just one or two questions, but got carried away.


That's fine with me...helped to \"bump up\" my post ratings... :lol: ...

You have a very promising son, kohjl. Not because of his excellent answers to the questions, but his humble demeanor that conveys a maturity beyond his age. There was none of that unbridled \"I-win-you-lose\" lip displayed by some of the other kids after the math exam last week.

It gives me great hope and confidence that we locally-bred Singaporeans are going to have a future in our own country.

yes, fully agreed. Good academic results and character.