Q&A - PSLE Science

[balu_priya]

Robertpattinsonidle:

balu_priya:

Recall those cupcake wrappers? Once it \"open up\", the surface area is much larger than a round cup of similar diameter.


Or perhaps to think about curtains; when the curtain is \"unfolded\", it is about 1.5 times longer.

But the qsn did not say to open up. So anwer should be the first
robertpattinsonidle ft. JB

But answer key says its 3.I don't understand.[/quote]
anyways... where did u get this qsn from?[/quote]
A school's original prelim paper which has oiginal answers provided by teacher so its definitely correct.

[balu_priya]

kwcllf:

balu_priya:

Recall those cupcake wrappers? Once it \"open up\", the surface area is much larger than a round cup of similar diameter.


Or perhaps to think about curtains; when the curtain is \"unfolded\", it is about 1.5 times longer.

But the qsn did not say to open up. So anwer should be the first
robertpattinsonidle ft. JB

But answer key says its 3.I don't understand.[/quote]
3 is correct. As it has many folds, which means surface area is the biggest among all the others (not just the top, but the side folds as well), it should cool fastest.

Imagine those car radiators or aircon compressors, you can find many blades and these blades help to cool the machine down due ti airflow in between these blades or folds.[/quote]
Your explanation is fantastic. :thankyou: kwcllf and Robert.

[balu_priya]

Please help. My guidebook mentions that balances measure mass not weight http://i50.tinypic.com/9fo5tz.jpg\"> but the given answer is option 3.

[charsen]

[quote=\"balu_priya\"]Please help. My guidebook mentions that balances measure mass not weight http://i50.tinypic.com/9fo5tz.jpg\"> but the given answer is option .

[superksmum]

Hi all,

Could anyone help with this:
What is the difference between the binary fission and budding, and for which cells it applies to?

[paranoid]

Please help with this question


A company is mindful of the impact its products have on the environment. Which of the following measures could the company take to be environmentally friendly?

A. Using materials that are biodegradable
B. Using renewable energy sources to power its plants
C. Designing products that are as energy efficient as possible
D. Designing packages that save space during transportation


1) A and B only
2) C and D only
3) A,C and D only
4) A,B,C and D
Thanks in advance. :imdrowning:

[Robertpattinsonidle]

answer given is 3. my answer is 1. any reasons? http://i45.tinypic.com/34o6el1.jpg\">

[Robertpattinsonidle]

paranoid:

Please help with this question


A company is mindful of the impact its products have on the environment. Which of the following measures could the company take to be environmentally friendly?

A. Using materials that are biodegradable
B. Using renewable energy sources to power its plants
C. Designing products that are as energy efficient as possible
D. Designing packages that save space during transportation


1) A and B only
2) C and D only
3) A,C and D only
4) A,B,C and D
Thanks in advance. :imdrowning:

answer should be 4.

[G Tan]

Is air a better heat conductor than water??

[Haneyi]

G Tan:

Is air a better heat conductor than water??

No, air is a poor conductor of heat. ^^