PSLE 2009 - Science

[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!

[Vaizard]

Hello, I am a candidate taking the PSLE.


What is the answer for the question about the flower wrapped with plastic bag? Is the answer B and anther? :shock:

[acelancer]

Vaizard:

Hello, I am a candidate taking the PSLE.


What is the answer for the question about the flower wrapped with plastic bag? Is the answer B and anther? :shock:

yup! i put tht too! at first i was stump by it.....

[pinky88]

Vaizard:

Hello, I am a candidate taking the PSLE.


What is the answer for the question about the flower wrapped with plastic bag? Is the answer B and anther? :shock:

My boy put : B & Stigma but he says the correct ans shld be B & Anther.

[acelancer]

pinky88:

Vaizard:

Hello, I am a candidate taking the PSLE.


What is the answer for the question about the flower wrapped with plastic bag? Is the answer B and anther? :shock:

My boy put : B & Stigma but he says the correct ans shld be B & Anther.

i nearly wanted to kei kiag change my ans to b and stigma then my eraser drop on the floor then i decided not to

[caroline3sg]

Any one can tell me your answer for the farmer spraying pesticides?

[justsay]

caroline3sg:

Any one can tell me your answer for the farmer spraying pesticides?

veg increase, fruit trees decreased ?