Section I - Multiple Choice (1 Viewer)

[kiinto]

This is possibly the worst reasoning ever. Both A and C are semiconductors.

+1. Word for word what I was going to post.

I still think it's A. Even if the BoS says it's B, I still think it's A. I mean, what if we're trying to detect thermal radiation from a particularly cold person (he's been plowing the snow fields of siberia). Peak wavelength would be down and to the right ---> InSb semiconductor won't be as effective ---> HgCdTe is better for the job.

 

[someth1ng]

+1. Word for word what I was going to post.

I still think it's A. Even if the BoS says it's B, I still think it's A. I mean, what if we're trying to detect thermal radiation from a particularly cold person (he's been plowing the snow fields of siberia). Peak wavelength would be down and to the right ---> InSb semiconductor won't be as effective ---> HgCdTe is better for the job.

That's partly like my logic - I just feel that they are both valid ways though. I only believe B because it is able to detect more. It was a rather poor and ambiguous question that was written.

 

[joeyz_da_ak2plz]

Re: General Thoughts: Physics

it was D right? cuz that was the cloest one.. but it EXCLUDES ALL magnetic field not some.. so fked up

it was b for sure

 

[imsleepyz]

Hey guys, for question 13, I didn't use Kepler's Law of Periods. Instead I used v=2(pi)r/T and used the velocity from question 12. And so I got C for q. 13. Why is this method wrong, will someone tell me please?

 

[zhou]

Re: General Thoughts: Physics

it was b for sure

no there are no currents induced in the magnet

 

[mickstarify]

Hey guys, for question 13, I didn't use Kepler's Law of Periods. Instead I used v=2(pi)r/T and used the velocity from question 12. And so I got C for q. 13. Why is this method wrong, will someone tell me please?

ok so v = 2pi*r / T, I cant find any v from the first question but anyway you can't use v from anywhere, at different orbits there will be different orbital velocities (it is not constant, unlike r^3/t^2) and as such you can't just sub it into other equations

 

[imsleepyz]

ok so v = 2pi*r / T, I cant find any v from the first question but anyway you can't use v from anywhere, at different orbits there will be different orbital velocities (it is not constant, unlike r^3/t^2) and as such you can't just sub it into other equations

I used the equation v=sqrt((GM)/r). That's how I worked out centripetal force in question 12.
I know it sounds like a very long way of doing question 13 but I'm just wondering why i don't get the same answer as you would get using Kepler's Law of Periods... Thanks though!

 

[Danstar2]

I'll admit it was a hard MC, I'm hoping for around 15, worst case 13+, I doubt I went that wrong though.
Averaging out from what I can see here there are definitely 3 I did wrong.

 

[Heydosaurus]

I screwed multiple choice so bad. I'm looking at 12/20 tops. I have no real dramas with this, however, as I'm extremely confident that I blitzed the rest of the paper (excluding Angry Birds, because I'm a retard). Hopefully I can pull out a good 80/100 raw, although I will be very content with anything in the seventies, considering my rather crappy (61% raw) trial result. Multiple choice in Physics has always been my bizarre downfall. In the trial, which I believe was based off of the CSSA trial, I got 6/20 for the multiple choice questions.

 

[kdizzler]

18/20 can't complain, it was a hard MC
and for the last question (I got it wrong), but all 4 are semi conductors because conductors have a band gap of 0 eV, and insulators are generally >10eV
the induced EMF question, It's definitely D, as you take the gradient and reverse the direction (Back EMF), had the identical question the the trial coincidently got wrong

 

[lolcakes52]

for 8, you ignore the angle as they already give you the length of wire going through the magnetic field at the appropriate angle.

for 14, it is d. You take the negative derivative, refer to this: http://en.wikipedia.org/wiki/Faraday's_law_of_induction

for 20 I put B, I hope it is right.

 

[Nooblet94]

1-D
2-A
3-C
4-C
5-C
6-C
7-B
8-A
9-B
10-D
11-C
12-A
13-B
14-C
15-D
16-A
17-B
18-C
19-D
20-B

How many mistakes?

 

[someth1ng]

1-D
2-A
3-C
4-C
5-C
6-C
7-B
8-A
9-B
10-D
11-C
12-A
13-B
14-C
15-D
16-A
17-B
18-C
19-D
20-B

How many mistakes?

4. B
14. D
16. C
20. Still under debate.

 

[Nooblet94]

4. B
14. D
16. C
20. Still under debate.

Tits. By under debate, you mean everyone thinks it's B except me, right?

 

[someth1ng]

Tits. By under debate, you mean everyone thinks it's B except me, right?

It's either A or B depending on what they mean by "most suitable".

 

[da_only_tony]

can anyone upload the paper

 

[lolcakes52]

can anyone upload the paper

nope, copyright issues.

 

[NickGero]

Wow I actually got 20/20 for M.C. -.-

Here's to hoping I didn't screw the rest of the test up.

 

[xmichaelpham]

These were my answers; please check

1. d
2. a
3. c
4. b
5. c
6. c
7. b
8. a
9. b
10. d
11. c
12. a
13. b
14. d
15. d
16. a
17. b
18. c
19. d
20. b

 

[xmichaelpham]

4. B
14. D
16. C
20. Still under debate.

16. A
20 is B