Q&A - P3 Science

[elkniwt]

tianzhu:

Hi elkniwt and muffins,

Good Morning,

Looking at this question, it is hard not to miss one word in upper case and bold. Why do you think LEAST might mean from the context of this question? What clues does the setter intend to give?

In this instance, I shall take LEAST to mean the lowest, fewest or smallest in number.

In primary science, students learnt that bread mould grows quicker in dark, wet and warm conditions.

The toaster heats up the bread and removes the moisture from them; therefore it’s not likely to have moulds after three days. Hence option (1) and (3) are offside.
Between option (2) and (4), I’d go for option (2) because the amount of air in the sealed bag is limited.

Before I go off, muffins, I am no expert. I am a victim of circumstances. I am also learning as I answer questions because I’ve to do further reading.

Best wishes

Dear tianzhu and muffins,

Thank you very very much for your help. :thankyou:

This question is indeed tricky.

Thanks again,
elkniwt

[elkniwt]

Need some expert advises here. :?:


Is a wooden ladle or a metal spoon waterproof? I thought metal spoon is waterproof while a wooden ladle is not. Please advise. Thanks.

Btw, I am referring to RGS P4 2009 SA1 Paper Qn 33
http://www.orlesson.org/orp/09Sc/P4-09-Sc-SA1-RGS.pdf

[Tang]

elkniwt:

Need some expert advises here. :?:


Is a wooden ladle or a metal spoon waterproof? I thought metal spoon is waterproof while a wooden ladle is not. Please advise. Thanks.

Btw, I am referring to RGS P4 2009 SA1 Paper Qn 33
http://www.orlesson.org/orp/09Sc/P4-09-Sc-SA1-RGS.pdf

Wood is not waterproof. (There are water carrying tubes in it.)

Metal is waterproof.

[jesschan]

Is it possible to find directions in a jungle if you only have an unlabelled magnet and a string?

[Tang]

jesschan:

Is it possible to find directions in a jungle if you only have an unlabelled magnet and a string?

I think so. Look at the direction of the shadow and the magnet.

[elkniwt]

Tang:

Wood is not waterproof. (There are water carrying tubes in it.)

Metal is waterproof.

Thank you, Tang!! :lol: So, the answer key is wrong.

[tianzhu]

Hi


There is an advertisement on cookware by Robinsons in ST today. I’ve a stainless steel pan similar to the one in this link.
http://www.wmf.com/pans/stainless-steel-pans_82511326.html?sid=7DC33254-E9A5-4B18-ADEC-733CE7E1DF51

The handle is also made of stainless steel. In primary science, students are usually taught that the handles are made of plastic, wood or rubber so that it’ll not be too hot to hold.

My boy asked me why and we had quite a few interesting moments then.

Best wishes

[Sun_2010]

tianzhu:

Hi


There is an advertisement on cookware by Robinsons in ST today. I’ve a stainless steel pan similar to the one in this link.
http://www.wmf.com/pans/stainless-steel-pans_82511326.html?sid=7DC33254-E9A5-4B18-ADEC-733CE7E1DF51

The handle is also made of stainless steel. In primary science, students are usually taught that the handles are made of plastic, wood or rubber so that it’ll not be too hot to hold.

My boy asked me why and we had quite a few interesting moments then.

Best wishes

Good point.
The thing is man made stuff can customised as per need. Dotty wanted to know how come the glass on full length windows is not fragile?
Similarly rubber- can be tuned as per requirement.
So generalizing the properties to applictions can be a bit confusing, At P3/P4, they are OK, but later when they star assocaiting to many of the real life products , it does get a bit confusing...
They have to think what is expected of them, what they have been taught per syllabus , why the exceptions/specialised cannot be taken in before answering.

Like in the example , if there was a question about which material would be suitable for making a handle of a cooking pan, steel would be marked incorrect. For that matter any metal.



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[usaik]

tianzhu:

Hi


There is an advertisement on cookware by Robinsons in ST today. I’ve a stainless steel pan similar to the one in this link.
http://www.wmf.com/pans/stainless-steel-pans_82511326.html?sid=7DC33254-E9A5-4B18-ADEC-733CE7E1DF51

The handle is also made of stainless steel. In primary science, students are usually taught that the handles are made of plastic, wood or rubber so that it’ll not be too hot to hold.

My boy asked me why and we had quite a few interesting moments then.

Best wishes

For cooking over traditional stoves, the handles must be made of plastic. wood or rubber so that the heat will be insulated at the handles.

However, these days, we use induction cooker/stove where high-frequency electromagnetic field is being engaged such that content in a cookware is being heated without heating the outside of the cookware. WMF is one of such cookware extremely good to be used over induction cooker/stove. The handles will not be hot even if the content inside is boilling hot.

The primary school science needs to catch up with time!

[tianzhu]

Sun_2010:

Like in the example , if there was a question about which material would be suitable for making a handle of a cooking pan, steel would be marked incorrect. For that matter any metal.

Hi

The concern here is students who are capable of observing real life examples may end up giving alternatives which are different from those in the answer keys. If the marking schemes are strictly followed, then students may ended giving correct answers to questions, but are marked wrongly according to the question setter’s answer schemes.Students may ended up confused.

Best wishes