PSLE 2012 - Science

[Alex_]

fantasy1:

what is option (4) .is it all of the above

You talking about the friction question? Yep, it is..

[Clairifina]

What were the tough questions?

[BeContented]

kiasu学生:

SAHM_TAN:

[quote=\"kiasu学生\"]agreed. jus did ppr and seems that booklet B is different, has a lot of.... unusual daily liife application qs, not just regurgitaion of facts like most r used 2... but lucky bklt B has less weightage than sec. A

Pls give an example of the qn from bklet b if you are able to remember. Thanks

ill try

Q: Some buildings use a cooling mist system 2 lower the temperature of the surroinding air. the mist comes out in the form of small water droplets.

Q: How does the cooling mist system help 2 lower the temp of the surrounding air? (2m)

some fans were added 2 the coolinf mist systeem.

Q: how do the fans help in the cooling mist system? (1m)

that should be this pprs killer Q[/quote] :yikes:
What's your answer? DS prob wrote some 'rubbish' cos he say cannot remember his answer at all But this mommy here keen to know the answer ;). Last 2 weeks got me a little interested in sci & still gotta go thru PSLE with DD next year

[SAHM_TAN]

kiasu学生:

SAHM_TAN:

[quote=\"kiasu学生\"]agreed. jus did ppr and seems that booklet B is different, has a lot of.... unusual daily liife application qs, not just regurgitaion of facts like most r used 2... but lucky bklt B has less weightage than sec. A

Pls give an example of the qn from bklet b if you are able to remember. Thanks

ill try

Q: Some buildings use a cooling mist system 2 lower the temperature of the surroinding air. the mist comes out in the form of small water droplets.

Q: How does the cooling mist system help 2 lower the temp of the surrounding air? (2m)

some fans were added 2 the coolinf mist systeem.

Q: how do the fans help in the cooling mist system? (1m)

that should be this pprs killer Q[/quote]Thank you for sharing.

[GLORYmum]

kiasu学生:

ximinful:

What is the answer for the friction question in booklet A?

Hi ximinful,the ans is 4

Is this answer where ABC is all correct?

[Alex_]

GLORYmum:

kiasu学生:

[quote=\"ximinful\"]What is the answer for the friction question in booklet A?

Hi ximinful,the ans is 4

Is this answer where ABC is all correct?[/quote]Yes, it is

[Clairifina]

Is my answer correct for the mist question?


The mist system gives out water droplets. As water is not a conductor of heat, it will not conduct heat to the surroundings and thus it will help to cool the surrounding air.

[James Ang]

kiasu学生:

SAHM_TAN:

[quote=\"kiasu学生\"]agreed. jus did ppr and seems that booklet B is different, has a lot of.... unusual daily liife application qs, not just regurgitaion of facts like most r used 2... but lucky bklt B has less weightage than sec. A

Pls give an example of the qn from bklet b if you are able to remember. Thanks

ill try

Q: Some buildings use a cooling mist system 2 lower the temperature of the surroinding air. the mist comes out in the form of small water droplets.

Q: How does the cooling mist system help 2 lower the temp of the surrounding air? (2m)

some fans were added 2 the coolinf mist systeem.

Q: how do the fans help in the cooling mist system? (1m)

that should be this pprs killer Q[/quote]Evaporation of mist takes away heat and causes cooling as heat is required to change the mist from liquid state to water vapour which is gaseous state. By creating mist instead of using only water, the surface area of the water is increased and the greater the exposed surface area, the greater the rate of evaporation.

The use of fans creates wind which is moving air and the presence of wind increases the rate of evaporation and produces a greater cooling effect.

[fantasy1]

Anyone what is the anser for Q19) SEction (A)

[cccleo]

fantasy1:

Anyone what is the anser for Q19) SEction (A)

What's Q19about?