PSLE 2009 - Science

[Sahimi]

yjmama:

My DD answered as water and oxygen

My ans is water and oxygen too! :celebrate:

[MummyJamie]

acelancer:

is there any mention of the right temperature??? i can't remember it too

Nope ^^

[caroline3sg]

wamth (temp), water, air (oxygen + carbon dioxide)

[caroline3sg]

My girl also put water & oxygen

[justsay]

caroline3sg:

wamth (temp), water, air (oxygen + carbon dioxide)

so is the answer water, oxygen and carbon dioxide ?

[the ME]

Hello:

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


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

Its something like that.

There's a (D)light. I think.

[mathsparks]

acelancer:

i tot is all cos without the bone the whole thing would not work

mathsparks' son: My answer is all. The bone is like the board for a lever, the joint is the fulcrum and the muscles are the effort. The dumbbell is the load. So all are needed. (Also, all the systems in the body work together so even the digestive and respiratory systems need to work too.)

PS: I can't play computer games till tomorrow:(:(:(:(

[hot_chocolate]

Tang:

hot_chocolate:

my answer for the pot/kettle question was: there is less contact between the surface of kettle b(the one with air spaces) compared to kettle a( the one without air spaces) thus, heat travels more quickly to the kettle a than b, causing the water in it to boil faster.


is my answer correct? I didn't mention that air is a good conductor of heat. :frustrated: yikes!!!

Hi Hot_chocolate,

Your answer is quite the same as what is given here:

http://pslescience.blogspot.com/

Instead of 'heat travels more quickly', it states that 'Pot A gained more heat' - more contact.

Hi Tang, thanks! I feel much reassured...

[emerald]

acelancer:

at first i put oxygen and water then i kei kiang go change my ans.

I'm sure you're not alone, changing to wrong answer(s) are just unavoidable in exams...so chi kek, right. Cheer up!

[acelancer]

emerald:

acelancer:

at first i put oxygen and water then i kei kiang go change my ans.

I'm sure you're not alone, changing to wrong answer(s) are just unavoidable in exams...so chi kek, right. Cheer up!

lol, thx!