Q&A - PSLE Science

[ss501]

hi,

pls help to explain, thanks .

http://i51.tinypic.com/2mi1a1v.jpg\">
http://i56.tinypic.com/szifds.jpg\">

[ss501]

hi,

The answer given is 3, pls help to explain, thanks.
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[Cockroach]

SUPERCKJ:

P5G:

[quote=\"SUPERCKJ\"]Anybody did the 2011 RGPS Prelim Science MCQ.


Qustion 28 with a test tube at the top part and an ice protected by metal gauze.

Question: Which one best explains why ice at the bottom tube takes a longer time to melt?

Is the ans 4? Metal gauze prevent heat from reaching the ice.

Hi Uncle/Auntie SUPERCKJ,

The answer is (3) Water conducts heat away slowly.

Can explain?[/quote]4 is out because metal gauze would, instead conduct heat faster but not sure whether why 3 is the answer anyone help?

[ss501]

hi,

The answer given is 2, pls help to explain, thanks.
http://i51.tinypic.com/egy4qc.jpg\">

[ss501]

hi,

The answer given is 3, pls help to explain, thanks.
http://i56.tinypic.com/24yrc6e.jpg\">

[ss501]

hi,

pls help to explain, thanks .
http://i54.tinypic.com/30hq0ow.jpg\">

[Cockroach]

http://i56.tinypic.com/i6wi8h.jpg\"> :rahrah:

can someone help me with this post?
TIA

[Cockroach]

http://i51.tinypic.com/348kmc3.jpg\"> larger version

[atutor2001]

ss501:

hi,

pls help to explain, thanks .
http://i54.tinypic.com/30hq0ow.jpg\">

The water level in the bottle will drop because when ice changes from solid to liquid state, its volume will decrease.

There will be water droplets on the out surface of the bottle. Water vapour from the surrounding air comes into contact with the cold surface of the bottle and condenses, forming water droplets on the outer surface of the bottle.

[ss501]

hi,

pls help to explain, thanks .

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