Q&A - PSLE Science

[Nebbermind]

while graphite is a known conductor of electricity, is the term ‘carbon’ considered conductor or non-conductor?

[snowman.022851697]

Graphite is carbon molecules arranged in a certain way. Therefore, carbon is an electrical conductor.

[atutor2001]

Nebbermind:

while graphite is a known conductor of electricity, is the term 'carbon' considered conductor or non-conductor?

The safest answer is : \"Some forms of carbon are conductor of electricity\". If it is True or False question, I would put True.

[Nebbermind]

http://img137.imageshack.us/img137/3121/dsc00302f.jpg

this is from this yr's prelim paper. Do you think the lamp will ever light up?

how do one interprete a switch that joins 3 paths?

[Nebbermind]

atutor2001:

Nebbermind:

while graphite is a known conductor of electricity, is the term 'carbon' considered conductor or non-conductor?

The safest answer is : \"Some forms of carbon are conductor of electricity\". If it is True or False question, I would put True.

http://img713.imageshack.us/img713/1037/dsc00303x.jpg

I need P & R to be conductors. So shd it be (3) or (4)??

[atutor2001]

Nebbermind:

atutor2001:

[quote=\"Nebbermind\"]while graphite is a known conductor of electricity, is the term 'carbon' considered conductor or non-conductor?

The safest answer is : \"Some forms of carbon are conductor of electricity\". If it is True or False question, I would put True.

http://img713.imageshack.us/img713/1037/dsc00303x.jpg

I need P & R to be conductors. So shd it be (3) or (4)??[/quote]I will pick (4) because it is the best answer as all forms of pure aluminium and copper are conductors of electricity.

As for carbon, only graphite is a conductor of electricity and other forms of carbon, e.g. diamond, coal, soot, are non-conductor of electricity.

If there is no option (4) than (3) would be the best answer.

[Nebbermind]

Thanx, atutor2001!!

[tianzhu]

Hi


I’ve asked this question via PM.I thought it’s an interesting one and some students may find it challenging to draw the shadows from the different positions.

Q33 P5 SA2 2009 CHS
http://www.orlesson.org/orp/09Sc/2009-Sc-SA2-CHS.pdf

Another similar type of question, this time MCQ which tests a student’s visualization ability.

Q30 P6 SA2 2009 NYPS
http://www.orlesson.org/orp/09Sc/2009-P6-Science-SA2-Nanyang.pdf

Best wishes

[Nebbermind]

tianzhu:

Q30 P6 SA2 2009 NYPS
http://www.orlesson.org/orp/09Sc/2009-P6-Science-SA2-Nanyang.pdf

Best wishes

What is interesting is whether the students are taught how to represent a triangular block such as that shown in 'D'. I remember it was only during technical class in sec school that we are taught to draw the line to represent the 'peak' of the triangular block in the plan view.

BTW, the answer shd be (2), right?

[tianzhu]

Nebbermind:

BTW, the answer shd be (2), right?

Hi

Option (3) is the answer.

Best wishes