LAST Minute Multiple Choice Practice A Level Physics

Рет қаралды 7,652

Күн бұрын

Last Minute Sessions: zphysicslessons.net/physics-t...
To support this channel:
/ @zhelyo_physics
Here are my solutions to the sample assessment paper from OCR A Level Physics. Please note that these are not official solutions and I may have made a mistake at some point. You can find the original paper here at the OCR's website: www.ocr.org.uk/Images/171727-...
These questions are applicable to all exam boards including OCR A, AQA, Edexcel and international qualification such as CIE, Edexcel International etc.
Chapters:
00:00 Question 1
00:46 Question 2
02:32 Question 3
05:02 Question 4
06:33 Question 5
07:48 Question 6
10:32 Question 7
12:46 Question 8
13:37 Question 9
14:03 Question 10
15:08 Question 11
15:38 Question 12
16:16 Question 13
17:35 Question 14
20:14 Question 15

Пікірлер: 108

@zhelyo_physics 28 күн бұрын

I thought these multiple choice questions were pretty hard, potentially harder than the real papers. Hope the very last one makes sense! Thank YOU for using my channel!!

@JettixX 28 күн бұрын

And thank you for creating quality and accessible learning materials

@leelax_x6991 28 күн бұрын

I'm glad you said this cuz I thought they were pretty tough!

@user-ru5sw3ss2u 28 күн бұрын

For the last question, I calculated KE using 0.5mv^2, where v = (2 x pi x radius) / (24 x 60^2) but this doesn't work. Could you please explain why? Great video btw, thank you!

@zhelyo_physics 28 күн бұрын

@@user-ru5sw3ss2u Hi, the time period may not be 24 hours. To do this this way you'd need to calculate the time period using kepler's third law. Easiest way to calculate orbital velocity is sqrt(GM/r) . Hope this helps!

@user-ru5sw3ss2u 28 күн бұрын

@@zhelyo_physics Ah I see thank you!

@covenantfosu4872 28 күн бұрын

What a legend. Good luck to everyone on their physics exams.

@zhelyo_physics 28 күн бұрын

thank you for the comment, good luck!

@swagdisease7376 28 күн бұрын

Zphysics, however I feel coming out of the exam tomorrow. Just know that it would he alot worse if I had not found your channel. Thank you for everything thus far

@zhelyo_physics 28 күн бұрын

wow thank you so much for this comment. GOOD luck!

@jameschivers6729 28 күн бұрын

good luck everyone. I'm cooked 💀

@draganmorganukic-gudgin884 28 күн бұрын

we all are, especially those doing AQA

@vybz987 28 күн бұрын

Same 💀💀

@JoelR574 28 күн бұрын

Bro Ive got a few hours to go through the whole Spec and I’m gonna be learning not revising 💀

@MatthewGrayson-pb2kj 28 күн бұрын

Same

@anxr44g 28 күн бұрын

If its anything like aqa 2023 we’re ashes icl 😭

@lunganghimself 28 күн бұрын

good luck to us all tomorrow, hopefully the exam boards are kind

@best_mate456 28 күн бұрын

Guys there is an easy tip if you struggle an 1 mark Q Skip it (and maybe come back)

@asdasdasda5857 28 күн бұрын

Im cooked for tomorrow. Regardless thanks zphysics you are the goat

@zhelyo_physics 28 күн бұрын

you got it! Good luck tomorrow!! Thanks for the comment.

@raijin878 28 күн бұрын

you’re a god sent! the last question was driving me insane yesterday cuz i just kept getting 6.0 x 10^9 and i couldn’t find anyone solving it

@zhelyo_physics 28 күн бұрын

No problem! It's tricky, even more so, I don't think the real answer is that as it presumes the initial KE is 0 but the earth itself is rotating.

@sultanamjed3641 28 күн бұрын

thank god these are specimen questions they require so much working especially the last question

@fpsa_ 28 күн бұрын

Are specimen papers generally harder?

@jjj-is5dl 28 күн бұрын

@@fpsa_ yes for some reason

@user-mn4yg7kl5i 28 күн бұрын

@@fpsa_ the one he just did is, idk about other exam boards

@Synzoku 28 күн бұрын

@@fpsa_ yes they try to include as much content as possible, usually.

@zhelyo_physics 28 күн бұрын

agreed, they are trickier

@Allinone-nm2jh 28 күн бұрын

thank you very much and goodluck to all of us .

@zhelyo_physics 28 күн бұрын

Good luck guys!!!

@andrewthake7773 28 күн бұрын

thank you so much, been watching since the start of a levels you're an absolute legend mate

@zhelyo_physics 28 күн бұрын

thank you so much for your comment! very much appreciated, good luck tomorrow!!

@bettyboy4241 28 күн бұрын

Thank you!

@zhelyo_physics 28 күн бұрын

anytime!

@pepsiman4418 28 күн бұрын

thanks so much, truly.

@zhelyo_physics 28 күн бұрын

Anytime!

@Jennaaa.tinggg 28 күн бұрын

Prayers for anyone doing Aqa

@zhelyo_physics 28 күн бұрын

Good luck!

@teacupcakes2739 28 күн бұрын

Wow i was actually doing this paper printed right in front of me and then i get this video recommended. Excellent.

@zhelyo_physics 28 күн бұрын

great minds think alike!! : ) Good luck!

@s.hjb0 28 күн бұрын

yes thank you

@zhelyo_physics 28 күн бұрын

Anytime!

@Endermanv-ot2if 28 күн бұрын

For Q7 you can go straight to using the v^2 equation but just put s = 1.3m in to find the vertical velocity component upon hitting the ground, no need for 2 suvats.

@zhelyo_physics 28 күн бұрын

I agree! I was almost solving them "live" in a free period, so pretty similar to what I would have spotted first in a real exam. I completely agree though, this would be more efficient : )

@Endermanv-ot2if 28 күн бұрын

@@zhelyo_physics Also for the pressure question you made a pretty big assumption that the thin outer strip can be approximated well by a rectangle of length 2piR and width t, this worked for that one example but a better way that works more generally is to relate t to the inner and outer radii and expand, then say that t^2 is negligible etc.

@fypkt 28 күн бұрын

last question is crazy

@zhelyo_physics 28 күн бұрын

Agreed

@dorianturner3790 28 күн бұрын

Do you have a video compilation of all of the one mark definitions for OCR? (e.g. what is the principle of moments)

@zhelyo_physics 28 күн бұрын

sadly not but they are within my all of revision videos

@ZypherOus-pt5cy 28 күн бұрын

Quick Question about 6. Would the driving force be 4000 X 7 or 4000 X 6 ? Because in the question they specify a clear difference between the trucks and the locomotive. And the 4000N resisting force is for each truck

@finite1731 28 күн бұрын

It doesn't matter either as the change in resisting force is the same i.e. 16000N

@ali-bt1cp 28 күн бұрын

that’s what i thought too and surprisingly it gives the same answer

@zhelyo_physics 28 күн бұрын

I think the definition of a "truck" in this question is a little dubious

@finite1731 28 күн бұрын

@@ali-bt1cp Yh I thought what he did was a bit dodgy but ultimately his way just looks at the change in resultant force so is wrong physics, because it should be assumed the loco will have a different resistive force as muR=frictional force and R=mg and m is larger and the wheels will have roughly the same mu, but his way will lead to the correct answer every time

@funlegendgaming8292 28 күн бұрын

Goat

@zhelyo_physics 28 күн бұрын

Hopefully one more video before the end of today...stay tuned! : )

@funlegendgaming8292 28 күн бұрын

@@zhelyo_physicsEven more goated 🐐

@teacupcakes2739 28 күн бұрын

in my printed version of the last question, the multiple choice answers different and include are 6x10^5 which is the initial answer without including the orbital speed.

@zhelyo_physics 28 күн бұрын

hmmm I wonder if it was changed after and this is an older version? Never seen this version I think.

@KazACWizard 28 күн бұрын

thank you for your continued service to spreading physics sir. and good luck to all the soldiers entering no mans land tomorrow. salute o7

@owl9098 28 күн бұрын

why is the circumference multiplied by the thickness when working out the pressure on the hollow tube in q5?

@finite1731 28 күн бұрын

Because the pressure is only applied to the circumference of the cylinder (I suspect technically the area is 2pit^2 since is the difference in areas of a circle with radius R+t and R which leads to the extra term but as t is negligible in comparison to R i.e. R>>t then that term can be ignored)

@magicmoony7243 28 күн бұрын

For question 3 you could probably figure out that its C much quicker by thinking that watts is joules per second and if its dissipating 6 joules in one second then its dissipating 12 joules in 2 seconds. Might be helpful if ur under time pressure.

@AinhoaBustillos 27 күн бұрын

7:30 i dint get why you have to use area= 2PiRt if its hollow but if it is not hollow area=PiR^2t

@supahas3821 28 күн бұрын

I also found that generally the specimen was way harder than any of the past papers. I don't think tomorrow's one will be as difficult though, hopefully

@ramens 28 күн бұрын

yeah i went though the specimen and it was def harder than any past paper i’ve gone through

@Tekerzzzzzz 25 күн бұрын

Thank you Zhelyo, however i fear to suggest that doing every single past paper still didnt help for OCR A paper 1

@zhelyo_physics 22 күн бұрын

grade boundaries are likely to reflect this. Good luck in preparation for the next one!

@yoshigod7480 28 күн бұрын

For question 13, why is statement 2 not correct when the diffraction grating is on the earth, Do the atoms in the atmosphere not absorb any photoenergy at all?

@zhelyo_physics 28 күн бұрын

excellent question, for physics we assume not, in practice there would be some however not a significant amount and also we can compare the solar specturm to other stars and differentiate what's from the atmosphere and what's from the sun. The amount absorbed by the atmosphere was pretty insignificant if I remember correctly.

@finite1731 28 күн бұрын

for question 5 would it not be more accurate to say that the area which the force is applied over is pi(R+t)^2-piR^2 which yields, when expanded, 2piRt+2Pit^2 but t^2 is negligible since t

@Endermanv-ot2if 28 күн бұрын

Yeah this is the correct way, physicists usually avoid expanding brackets at all cost!

@abrahamtharakan 28 күн бұрын

I'm a little confused as to why t^2 would be negligible, could you perhaps explain that?

@finite1731 28 күн бұрын

@@abrahamtharakan Originally t is much smaller than R so t^2 will be even smaller in comparison to R but in the question is only looking for an approximate value for the pressure so using the most significant term is sufficient though if they wanted a fully accurate value then the t^2 should be included. As an example of the squared term being negligible, the difference between 1cm to a meter is 100 fold but from 1cm^2 to 1m^2 is 10000 fold, there is also the case of small angle approximations where the higher terms of the Maclaurin series are ignored because of there large exponents.

@Endermanv-ot2if 28 күн бұрын

@@abrahamtharakan How big is 0.001^2?

@aadithc4389 28 күн бұрын

For 6, the question says the resistive forces are on the trucks, I would've thought this means the total resistive forces is 6 x 4000N not 7 x 4000N as the locomotive is not a truck. Is this incorrect?

@ashyman9139 28 күн бұрын

Yes it should be 6x4000

@KazACWizard 28 күн бұрын

no youre right, it said 6 trucks and a locomotive. i guess we are assuming locomotive is perfectly aerodynamic- ie drag coefficient is zero

@gitgudnga 28 күн бұрын

i think also because of the diagram he drew which only had trucks 1,2,3 so he took 4000*3 that made the answer correct

@finite1731 28 күн бұрын

I suspect it doesn't matter since the resultant force is the force from the loco minus the resistive force which initially is 0 and removing 4 carriages will lead to a reduction in the resistive force by 4x the resistive force of a single carriage leaving the a resultant force of 16000N

@zhelyo_physics 28 күн бұрын

I think for this one I assumed the locomotive is a truck, otherwise we are kinda saying the locomotive has no resistive force which is very much not possible. Hope this helps!

@rated-_-viperz7548 28 күн бұрын

in question 6 dont you do 4000 x 6 since there is 6 trucks and not 7?

@teacupcakes2739 28 күн бұрын

exactly my question. Why do you count a locomotive as a truck?

@finite1731 28 күн бұрын

@zhelyo_physics 28 күн бұрын

I agree, I think the definition of a truck is somewhat dubious in this question. I just assumed the locomotive will have the same drag as all the other ones (pretty good approximation, a real locomotive will have very similar resistive force). Hope this helps!

@Endermanv-ot2if 28 күн бұрын

@@teacupcakes2739 Hes cooked

@aryanvirdi458 22 күн бұрын

Could you do the same for paper 2?

@zhelyo_physics 22 күн бұрын

on it!

@craftbatter3865 28 күн бұрын

For 7, you do not have to do SUVAT twice if you use the distance as -1.3 and U as positive 7. I know both methods work, but when under time pressure you should probably use the most efficient method

@zhelyo_physics 28 күн бұрын

I completely agree : ) it was the first method that came to mind when I filmed this : )

@qarcin12 28 күн бұрын

my goat

@zhelyo_physics 28 күн бұрын

wohoo, thanks

@user-mn4yg7kl5i 28 күн бұрын

how is question 15 1 mark lol.. in 2021 the 6 marker was asking this

@zhelyo_physics 28 күн бұрын

I agree.

@ekbO 28 күн бұрын

ITS OVER

@stanb5840 28 күн бұрын

for question 3 although electricity isn't tested work, energy and power is isn't it? and the question only uses the power and not the p.d. given in the question

@zhelyo_physics 28 күн бұрын

It is not for OCR A. I have no idea what that question is doing in the specimen paper.

@stanb5840 28 күн бұрын

@@zhelyo_physics it is, it has the same paper code at the top as OCR A (H556) instead of the OCR B code (H557). And it literally says "physics A" at the top

@stanb5840 28 күн бұрын

OCR B doesn't have a paper called "Modelling physics"

@zhelyo_physics 28 күн бұрын

@@stanb5840 Hi, I meant electricity is not tested for OCR A on Paper 1 normally