Pure Physics MCQ Aftermath

VagueHart SG

How was it for you all? I prepared for my Os one week before it started... so.. lol

It was okok for me.

[e].Le-V SG

Too easy, as expected.

My physics teacher told me she predicted the A1 to be 75 based on the difficult paper 2, but now, she raised to 80 marks. =(

1-5 : DBBCD

6-10 : BDAAD

11-15 : BBCBC

16-20 : ACDCD

21-25 : ABADB

26-30 : DBACD

31-35 : BBACA

36-40 : ABDAD

These are my answers... please tell me if my ans is different from you.. =(

28 is wrong, shud be B, kana tricked!!!!!!

davidche SG

I have 1 wrong for now confirm. The microwave being satelite tv qn.

The other qn i have doubts is the magnetic field magnitude. elev, are you sure about your ans for that qn?

eagle SG

scan that question out?

davidche SG

28 shld be B

40 shld be A

My qn is qn37

davidche SG

I dont have a scanner but i can describe the qn. It is a concept qn

Is the magnetic field in the middle(pt A) of a permanant magnet stronger/weaker than a point outside the magnet(pt B), near the pole.

Pt A to the pole is roughly equidistance as ptB to the pole.

[e].Le-V SG

28 shld be D

40 shld be A

My qn is qn37

Erm, i think 28 is B

and for 40, cannot use turn ratio meh. furthermore, the qn also nv say it is an ideal transformer...

davidche SG

it is pre assumed. Thats what my teacher explicitly told me.

skythewood SG

Erm, i think 28 is B

and for 40, cannot use turn ratio meh. furthermore, the qn also nv say it is an ideal transformer...

for most questions, an ideal transformer is assumed. but tell me more about the q...

davidche SG

how bout 37?

many ppl say its A

skythewood SG

the more magnetic flux line, the stronger the magnetic field

Box_Slayer SG

37 is A? thought it's B? and whats the answer for qn9? pole thing

davidche SG

lolololol. looks like abstract art. Which, doesnt depict the field inside the magnet.

skythewood SG

see the black stuff? they represent field lines. know why you can't see the individual field lines? cause there is alot of field lines.

[e].Le-V SG

I think 37 is A, because the magnetic effect is strongest at the poles.

And for transformer, WTF i thought must state out one? I do past year qn also got say one, k nvm gone.

davidche SG

CANT BE CANT BE I DEMAND A SECOND OPINION!!

what i was thinking is that the magnetic attraction in the middle is very little.

skythewood SG

google.... research..... whatever....

[e].Le-V SG

eagle, pls enlighten us with ur intelligence.

http://i37.tinypic.com/28wjf4g.jpg

skythewood SG

fact: each electric current have it's own magnetic field.
fact: the closer you are to the current, the stronger the field is.
fact: Y is much closer to the current.

conclusion: B.

want to dispute any of the facts?

eagle SG

http://www.phys.lsu.edu/dept/opps/key_ideas_about_magnets.htm

9. A magnet is strongest at its poles.

A magnet’s greatest strength is found at its poles, and its strength diminishes rapidly moving away from the poles. At a point about midway between its two opposite poles, a bar magnet exhibits no magnetism at all, because the effects of the opposite poles cancel one another. The poles of a magnet are not necessarily of equal strength.

Actually I also cannot fully comprehend... Give me a while more to think about it