==> Sticky: User Created 60 Sample Questions with answers

blackcat007
Posts: 378
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Re: ==> Sticky: More ETS and 42 "active" Sample Questions

Postby blackcat007 » Sun Sep 27, 2009 12:30 pm

physics_auth wrote:
noospace wrote:Where did there questions come from? Are they really official ETS? If so how come they're not available on the website?

What's going on here?


It is a bit irritating to have to apologize again ... but I will do it once and for all ... . Questions 1-42 in this post are not ETS official questions, but questions that imitate those of the real PGRE test. Above all, to post ETS questions is plagiarism! Furthermore, I give directions (in green color somewhere in the 1st page) in this post how to find a pdf archive with ETS questions (about 30 questions with their brief solutions). The pdf mentioned contains ETS official questions. Is that clear? For those of you who want to practise only on ETS official questions there are directions on how to do this (the pdf I mentioned... the 4 practice tests etc.), the questions I post here periodically are for those who want to practise on PGRE questions beyond the official material. Ok?


I think you should mention this paragraph in the first page, before the 1st question, so that no further doubts arise in anyone's head. :)

physics_auth
Posts: 160
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Re: ==> Sticky: More ETS and 42 "active" Sample Questions

Postby physics_auth » Sun Sep 27, 2009 12:51 pm

blackcat007 wrote:
physics_auth wrote:
noospace wrote:Where did there questions come from? Are they really official ETS? If so how come they're not available on the website?

What's going on here?


It is a bit irritating to have to apologize again ... but I will do it once and for all ... . Questions 1-42 in this post are not ETS official questions, but questions that imitate those of the real PGRE test. Above all, to post ETS questions is plagiarism! Furthermore, I give directions (in green color somewhere in the 1st page) in this post how to find a pdf archive with ETS questions (about 30 questions with their brief solutions). The pdf mentioned contains ETS official questions. Is that clear? For those of you who want to practise only on ETS official questions there are directions on how to do this (the pdf I mentioned... the 4 practice tests etc.), the questions I post here periodically are for those who want to practise on PGRE questions beyond the official material. Ok?


I think you should mention this paragraph in the first page, before the 1st question, so that no further doubts arise in anyone's head. :)


Thanks Blackcat007. It think that now the whole issue is crystal clear. I have already done it ... . However, the fact that some people are confused about if these questions are official or not could mean that the questions are good imitations of the official ones :D . (For example, REA's questions can easily be recognized that are poles apart ... .)

noospace
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Re: ==> Sticky: User Created Sample Questions and Discussion

Postby noospace » Mon Sep 28, 2009 12:28 am

Hi physics_auth,

Thanks for the clarification. When you talk about these 30 ETS questions. I'm pretty sure you're referring to the ETS Major Field Questions right?

Wouldn't it have been a lot easier just to give the link (below) to avoid confustion. Anyway.

http://www.nocheating.org/Media/Tests/M ... hysics.pdf

physics_auth
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Re: ==> Sticky: User Created Sample Questions and Discussion

Postby physics_auth » Mon Sep 28, 2009 4:43 am

noospace wrote:Hi physics_auth,

Thanks for the clarification. When you talk about these 30 ETS questions. I'm pretty sure you're referring to the ETS Major Field Questions right?

Wouldn't it have been a lot easier just to give the link (below) to avoid confustion. Anyway.

http://www.nocheating.org/Media/Tests/M ... hysics.pdf


No, I don't refer to the ETS Major Field Questions, but to another pdf under the name GRE_practice. In the first page is quoted the PGRE committee ... .

noospace
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Re: ==> Sticky: User Created Sample Questions and Discussion

Postby noospace » Mon Sep 28, 2009 8:23 pm

Hi physics_auth,

Can you please post the url for these questions? It tried your google steps and got zero hits.

blackcat007
Posts: 378
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Re: ==> Sticky: User Created Sample Questions and Discussion

Postby blackcat007 » Mon Sep 28, 2009 10:24 pm

noospace wrote:Hi physics_auth,

Can you please post the url for these questions? It tried your google steps and got zero hits.

http://www.princeton.edu/~jdpeters/docs/ETS_extra.pdf

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hk
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Re: ==> Sticky: User Created 44 Sample Questions & Discussion

Postby hk » Mon Oct 19, 2009 6:14 am

Many thanks for the sample questions! :)

I would like to ask something about the ETS extra problems. Is there any full solution available for it? I've seen in this forum several topics discussing one particular question from the problem set though.
Thanks.

physics_auth
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Re: ==> Sticky: User Created 44 Sample Questions & Discussion

Postby physics_auth » Mon Oct 19, 2009 6:20 am

hk wrote:Many thanks for the sample questions! :)

I would like to ask something about the ETS extra problems. Is there any full solution available for it? I've seen in this forum several topics discussing one particular question from the problem set though.
Thanks.


The extra problems (i.e. the 2 pdfs which contain 30 questions each) are accompanied only by brief solutions (i.e. the number of the question and the correct answer-letter). Furthermore, as I know there are analytic solutions only for the 4 released full-tests by ETS.
If you want any help with any of that questions, post your query in some thread (this one or any other) or send a private message (if you don't want to post openly). It is up to you!
Physics_auth

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hk
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Re: ==> Sticky: User Created 44 Sample Questions & Discussion

Postby hk » Mon Oct 19, 2009 6:26 am

Wow, very quick reply, thanks!
Okay, I think I'll start a new thread then..

joshfr3
Posts: 1
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Re: ==> Sticky: More ETS and 42 "active" Sample Questions

Postby joshfr3 » Fri May 28, 2010 3:38 am

blackcat007 wrote:
colonblow wrote:hi, shouldn't the answer to #1 problem be letter D, which is 3g/L? If 3g/2L is the correct answer, can someone please tell me how it was solved? thanks thanks!

the only torque that is acting is that due to the weight of the beam. so mgl/2 =Ia
I=(ml^2)/3

equate and solve..



I have attempted to solve this problem quickly using a lagrangian. Clearly, I must be doing something wrong. Shouldn't the lagrangian yield the same answer? Would anyone be so kind as to include a light draft of this?

I used T = rotational kinetic energy + translational

and U = mgLcos/2

Thanks!

physics_auth
Posts: 160
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Re: ==> Sticky: More ETS and 42 "active" Sample Questions

Postby physics_auth » Tue Jun 01, 2010 12:40 pm

joshfr3 wrote:I have attempted to solve this problem quickly using a lagrangian. Clearly, I must be doing something wrong. Shouldn't the lagrangian yield the same answer? Would anyone be so kind as to include a light draft of this?

I used T = rotational kinetic energy + translational

and U = mgLcos/2

Thanks!


Here is what I did: Take +z-axis downwards and x-axis horizontal. Take as a generalized coordinate the angle θ between the axis of the rod (I refer to the axis along its length) and x-axis. You decided to solve the problem focusing on the motion of the center of mass. The potential energy of the center of mass is V = (1/2)*MgLsinθ with this selection of the generalized coordinate. The translational kinetic energy of the CM is (1/8)*Μ*(L^2)*(dθ/dt)^2 and its rotational kinetic energy is (1/24)*M*(L^2)*(dθ/dt)^2 since the rotation axis passes through the center of mass in this case (and is parallel to the fixed axis of rotation). Add the aforementioned quantities to form the Lagrangian L

L = (1/6)*Μ*(L^2)*(dθ/dt)^2 + (1/2)*MgLsinθ

and the equation of motion is: (1/3)*Μ*(L^2)*[d(dθ/dt)/dt] = (1/2)*MgLcosθ
solve for d(dθ/dt)/dt (the acceleration asked to find) and finally set θ = 0, because you want to find the angular acceleration when the rod is set free from the horizontal position.

letocharm
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Re: ==> Sticky: User Created 60 Sample Questions with answers

Postby letocharm » Fri Nov 09, 2012 6:16 pm

Hi good post. Some corrections, for number 50, I think none of them have the correct units. A is right but drop the m next to the l if you mean q=ml being the heat of fusion. If you mean l to be the entire amount of heat I think you'll need to make it l/m sinc you appeared to factor out m. Also perhaps it was assumed but it should be made explicit the masses of the two are the same.

Also neutrinos do have a magnetic moment though it's small.

physics_auth
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Re: ==> Sticky: User Created 60 Sample Questions with answers

Postby physics_auth » Thu Dec 20, 2012 4:56 am

letocharm wrote:Hi good post. Some corrections, for number 50, I think none of them have the correct units. A is right but drop the m next to the l if you mean q=ml being the heat of fusion. If you mean l to be the entire amount of heat I think you'll need to make it l/m sinc you appeared to factor out m. Also perhaps it was assumed but it should be made explicit the masses of the two are the same.

Also neutrinos do have a magnetic moment though it's small.


Hi there, I will take care ... it has been a long time since I posted this pool around 2009 ... therefore some rectifications might be necessary ... anyway thanks for your comments.

physics_auth

superderec
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Re: ==> Sticky: User Created 60 Sample Questions with answers

Postby superderec » Sat Aug 17, 2013 8:45 am

I think that there is no correct answer to question 25 and that the answer to number 23 is wrong

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Aether73
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Re: ==> Sticky: User Created 60 Sample Questions with answers

Postby Aether73 » Wed Apr 02, 2014 12:38 pm

superderec wrote:I think that there is no correct answer to question 25 and that the answer to number 23 is wrong

I'm getting \frac{Q}{6\epsilon_{0}} for number 25. The flux on each side of the cube should be equal (unless I've missed something here), and any cube has six sides. You know the rest.

physics_auth
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Re: ==> Sticky: User Created 60 Sample Questions with answers

Postby physics_auth » Wed Apr 30, 2014 1:07 am

Aether73 wrote:
superderec wrote:I think that there is no correct answer to question 25 and that the answer to number 23 is wrong

I'm getting \frac{Q}{6\epsilon_{0}} for number 25. The flux on each side of the cube should be equal (unless I've missed something here), and any cube has six sides. You know the rest.


You are right; thanks for the typo (this question was modified).
Question 23 has to do with the behavior of the resistor in terms of temperature ... resistance normally increases vs temperature ... .

superderec
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Re: ==> Sticky: User Created 60 Sample Questions with answers

Postby superderec » Sat Oct 04, 2014 11:56 pm

I think that the answer to question 58 should be E and that of No. 59 should be C instead of those answers given. Pls check.

+ answer to TRIAL QUESTION 1 is B

somy
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Re: ==> Sticky: User Created 60 Sample Questions with answers

Postby somy » Fri Jan 23, 2015 2:33 pm

Hey guys

At the first of this thread, it has been written that there are the solutions of these question, but few of them are just argued :? :( . I would be appreciate to tell me where the solutions have been written. I am in a hurry, please :roll:

Thanks for the nice froum

sishoueta
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Re: ==> Sticky: User Created 60 Sample Questions with answers

Postby sishoueta » Tue Oct 20, 2015 12:41 pm

My results for Questions 51 and 56 are A and C respectively! I would like to know your opinion about these questions my friends!

physics_auth
Posts: 160
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Re: ==> Sticky: User Created 60 Sample Questions with answers

Postby physics_auth » Sun Nov 15, 2015 1:12 pm

Anwers to questions (51) and (56) were supplied ... I will extend this pool up to 100 questions at some point.

bugaboo
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Re: ==> Sticky: User Created 60 Sample Questions with answers

Postby bugaboo » Thu Sep 08, 2016 12:47 am

In question 1 statement A is false unless the barrier between the wells is infinite. Statement B is false even if it is infinite. Statement D is also false, it should mention ground state, not just state.

SzwedyBallz
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Re: ==> Sticky: User Created 60 Sample Questions with answers

Postby SzwedyBallz » Tue Feb 21, 2017 8:09 pm

I'm a bit confused about question 56. The solutions say that the answer is A, both constants should be real for the operator to be Hermitian, but I don't see how kappa can be real. Suppose that lambda is equal to zero. Then the operator is just kappa*d/dx, which is just the momentum operator with the substitution of kappa=-i*hbar. Since the momentum operator is Hermitian, it seems that kappa must be imaginary. Please let me know what your thoughts are on the subject




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