ECZ SCIENCE PAPER 1 2021 INTERNALS || ECZ PAST PAPERS FOR GRADE 12.

[@THEDMSONLINESCHOOL]

Take note for question 4: mass stays constant anywhere in the universe, while weight changes and the object will have the same mass. so mass = weight /gravitational field strength. mass = 8/1.6 mass = 5kg. Its not the first answer i gave. I was lost here. Thanks for letting me realize.

[@getludylungu1986]

I apply to the question

[@joesiamukololo8324]

I don't understand the u come up with

[@FaithEsnart-mc8hx]

Am lost with number 6 because why did you use 6N instead of 60N

[@aaronkafula2389]

This is great

[@McTechzambia]

🙏

[@markomulala3241]

Wow, am enjoying I like your teaching I have started improving in science may God bless you sir.

[@THEDMSONLINESCHOOL]

Oh really? That is awesome.

[@MushabatiSande]

Am very happy to see this line of KZbin ❤

[@NERD-POET]

Hello, but on question 6 which is on moment why did you use 6N as Force instead of 60N which was given??

[@NERD-POET]

I'm actually waiting for the answer on moment,or is it the question which was wrong

[@ednessmasebo7921]

I have the same question,sir was it an error or something?

[@LubindaLubinda-hi2js]

I'm actually waiting for the answer of this question ✌️

[@ReynoldChase]

Iam also in a dilemma on this one how 60N changed to 6N. Let's hope someone will help us understand that.

[@gracembewe9870]

hello sir, i have a question on number 4, why did you use 10N/KG instead of 1.6N/KG since they said the weight on the moon is 8.0N, aren't we supposed to use the gravitational force that's on the moon to find the mass?

[@THEDMSONLINESCHOOL]

No, because we were asked to calculate the mass on earth, so we need to use the gravitational field strength of the earth.

[@andrewmutila5766]

@@THEDMSONLINESCHOOL Isn't the mas of the rock constant and the weight is suppose to change according to where the rock is [ moon or earth ] ?

[@THEDMSONLINESCHOOL]

@@andrewmutila5766Yes mass stays constant anywhere in the universe, while weight changes and the object will have the same mass. so mass = weight /gravitational field strength. mass = 8/1.6 mass = 5kg. Its not the first answer i gave. I was lost here. Thanks for letting me realize.

[@pentysonmwansa114]

True answer is B....it's the weight on the moon.Not on earth....call Michio kakuo

[@Toxic_ice141]

Hmmm

[@lubansachama786]

Thanks for the work you keep on doing sir. I just wanted to draw your attention to the last question in section C, question 3 on Hooke's law. Specifically on plotting the graph. The question says, plot a graph of force against extension. The coordinates you have used for extension, I think you might want to look at them again. You have used 120, 126, 132, 138, 144. I feel those coordinates are not for extension. I think the first thing you need to do is to first come up with the coordinates for the extension each load is producing. 120mm is the unstretched part of the spring. It is the total length of the spring when it is not loaded. In short, when the load is 0Kg the length of the spring is 120mm. So when the load is 0.2kg the spring stretches to 126mm which means the extension of the spring is 126-120=6mm. Consequently, a load of 0.4kg produces an extension of 132-120=12mm. And a load of 0.6kg produces an extension of 138-120=18mm. Therefore, the coordinates I think you're supposed to use on the extension axis are: 0, 6, 12, 18, 24 Hope you get my point. God bless you and keep up the good work. I personally, really appreciate the work you're doing.

[@THEDMSONLINESCHOOL]

Thanks for your positive feedback. You are right but that's is the same with what I did because 126mm was taken as zero and then the preceding values of extension followed through with proportional increase in mass. Try plotting using your data and see if your graph and the graph in the video won't look the same. I didn't want to go that root because I know the graph was going to be the same.

[@gabrieltembo]

B4 - The Bleeze

[@JoyceKasoma-dv1no]

Thank you very much teacher for making a difficult subject easy . Because of your teaching I now love science 😇

[@THEDMSONLINESCHOOL]

You are welcome and thank you for your kind comment, I really appreciate it.

[@JoyceKasoma-dv1no]

U are welcome 🤗

[@nchimunyahamuntu1524]

That's a good work sir may the might father in heaven continue being with you.i have enjoyed your teaching

[@THEDMSONLINESCHOOL]

Yes, thank you

[@WombaKachiza-vg7qg]

Your explanation is good❤

[@reubenlubasi432]

God continue blessing you sir, you are doing a great job ❤️❤️❤️

[@THEDMSONLINESCHOOL]

Thanks a million

[@NathanMatongo]

Sir you are really helping us we are appreciate you GOD BLESS YOU🎉🎉🎉🎉❤❤❤❤😂

[@MusondaAbraham-vr1hg]

sir you are doing a very wonderful job, you make me become a science solver, iam really appreciate

[@EnesiaKabamba]

Wonderful, it's easier to understand and learn fast

[@MarvelMoonga]

v(cm) is given comrade.. the same v points used in find G can be used to find v.. good work indeed

[@janetkaira5160]

Thank you so much sir for this lesson really appreciate for your hard work and may God bless you❤

[@arad-yt]

You've helped me a lot Thanks 💖

[@THEDMSONLINESCHOOL]

You're welcome 😊

[@NyaruonDeng]

Thank you so much sir for your hard working may Almighty father blessed you, much appreciated

[@emmanuelzulu7192]

You revisions are on point

[@alicengoma9949]

Thanks very much sir please keep on helping us God will bless you at least am getting something 🙏🙏 and it's really amazing

[@THEDMSONLINESCHOOL]

I will and thanks for the blessings.

[@juliusChitendele]

Really enjoyed this keep it up sir

[@iconiccj711]

Thank you very much sir it's really helping me have hope that I'll make it on my exams

[@THEDMSONLINESCHOOL]

You are welcome.

[@kawela3657]

@@THEDMSONLINESCHOOL do you also have online tutions

[@THEDMSONLINESCHOOL]

@@kawela3657 Currently am not conducting online tuitions other than the ones am conducting on my channel.

[@happychisapa773]

Taking Zambia to another level sir.....😔🥰

[@NERD-POET]

Hello, question A7 which is on the vacuum flask I think you made a mistake because the vacuum does not prevent heat loss by convection but radiation.so the answer there was supposed to be E which is a plastic clip

[@THEDMSONLINESCHOOL]

I think the answer i provided in the correct one.

[@NERD-POET]

Question A20

[@penelopebanda5497]

True I was thinking the same

[@myname_12]

Hi,just wanted to ask,on section c questions 2,why did the X-axis start with a 20?

[@MemoryMalambo-s8i]

You are the best teacher

[@THEDMSONLINESCHOOL]

Thank you 👍

[@nachisilahambaze2530]

Thank you so much sir for help, May God continue blessing you

[@THEDMSONLINESCHOOL]

You are welcome

[@lackson6884]

Thank you helping understand 😅🙏👊

[@THEDMSONLINESCHOOL]

You're welcome 😊

[@lackson6884]

@@THEDMSONLINESCHOOL Do you teach online topics in science

[@priscarchilundika6218]

Amazing teaching sir I really appreciate it

[@THEDMSONLINESCHOOL]

So nice of you

[@tulelatulela6546]

Thanks you Sir it will be really helpful for us doing AS level in physics..... cloud you please kindly share with us with the NSSCAS physics papers for 2022 cos am doing AS level this year and I just like to see what type of questions are likely to be asked I will be very grateful

[@THEDMSONLINESCHOOL]

What does this => NSSCAS stands for?

[@mimiwamulume2156]

On question 6, how did 60N become 6? If we are only dividing 30 by 100.

[@hezronbanda697]

My question too

[@modeccaimukana4322]

Sir on q C2(d) how do you made F subject of the formula and change the sign of one???

[@derricksimwanza4999]

Thanks continue the same brother❤❤❤❤❤❤❤❤❤❤🎉

[@giftkapambwe1604]

B1(d) if we're subtracting the last 1hour it stopped why can't we subtract the first 1hour as well,sir???

[@PreciousSauka]

Very helpful thanks ♥️

[@RuthMtonga-pu3fr]

Sir thanks very much. I got 3 in science

[@chongochongo648]

Thanks sir, u are really helping us. I really appreciate it.

[@THEDMSONLINESCHOOL]

That is awesome hearing from you.

[@pethiaschanda7938]

Keep it up good work sir 🙏🙏n do paper 1

[@THEDMSONLINESCHOOL]

Yeah, just keep fingers crossed. It's coming soon.

[@mikekoza]

Sir I noticed when you where plotting the graph of force against extension you used the pointer reading and not the extension which was supposed to calculated by subtracting 120 from each reading

[@audrichmoonga4356]

Sir why is Pascal a derived unit on q2

[@THEDMSONLINESCHOOL]

Because pressure is a derived quantity.

[@BravesSichamba]

I have started being motivated to have a one in science

[@MulengaStanley]

Your work sir is very helpful, thanks alot

[@KidrixMweema]

U teach very well

[@obeytrace6006]

Is it always when they ask you to determine then you should use the gradient formula

[@AstridahNakanyika]

Thanks i have learned a lot from you you

[@LikezoJaneMiyoba]

On question A7 y isn't it E only , E is the stopper ( lid) which prevents fluids ( steam ) out of the flask and as we all know convection is heat loss through fluids

[@LikezoJaneMiyoba]

And from my observation f is the vacuum which prevents heat loss by conduction, so please may you clarify that point so that we might get the sense

[@bathshebamuhundika4116]

I like your teaching sir

[@RuthMtonga-pu3fr]

Thanks very much sir 🙏🙏🙏

[@SosternMudenda-cq8bh]

You are doing your job well done

[@MULENGABlessing-um5yt]

Hello sir I really appreciate your work

[@chileshekangwaluo1960]

Hello nice explanation but I don’t understand why you go 6 instead of 60 for the force on question 6????

[@THEDMSONLINESCHOOL]

I realized I made an error. It going to be 6Nm. And they never provided that on the options. It was their error.

[@alexchiyabe9281]

@@THEDMSONLINESCHOOL sir, so meaning the closest answer was 1.8, but the actual answer is 18 right?

[@THEDMSONLINESCHOOL]

@@alexchiyabe9281 No, there was no correct answer i guess and i equally made an error in my answering.

[@RosebeckLukanga-jj3ix]

Why 6 , not 60

[@sarahkabamba345]

Sorry sir on sectionb question b1a isn't distance 48 because when calculating distance time graph we do not include the period which distance was constant we at 30 it's constant so I thought we subtract 10 from 58

[@THEDMSONLINESCHOOL]

We read distance from the y-axis, when an object is at rest, distance doesn't increase. When reading the distance, we only consider the parts of the graph which were not constant and the point at which the graph remains constant, when the graph goes constant, we connect that point to the y-axis and read distance covered. According to you, what is the answer?

[@chibalekatebe3371]

question A18 magnetic fields lines comes from north going towards south but why did you choose regional A as your answer to be as permanent South Pole

[@THEDMSONLINESCHOOL]

Using the right grip, where fingers curl in the direction of current, then the thumb points in the direction of the north. I don't know if you know what am talking about but if you know, then you should understand now. Apparently there's no field in the question.

[@mumbisolomon8085]

Sir please explain more how can extension for a 5N force be 15mm yet that of a 4N force is bigger?

[@AstridahNakanyika]

Thanks for helping 😊

[@matyassimwinga5677]

Think you so much Sir Am very clear

[@THEDMSONLINESCHOOL]

You are welcome ❤️ ❤️❤️. Holiday tuitions on. Let me know if you are interested.

[@matyassimwinga5677]

Yes am interested

[@THEDMSONLINESCHOOL]

@@matyassimwinga5677 contact me through my whatsapp line 0977924175.

[@EnerstMashiba]

Thank you so much sir 💯

[@modestarsimaambo1325]

Are we supposed to get any points from the graph

[@killianmulwano8009]

Really helpful

[@THEDMSONLINESCHOOL]

Glad to hear that

[@DinaZulu-s3r]

I'm enjoying thank you sir

[@AckimNgandwe-qp8xs]

I have a guestion sir.why have you used 6N instead of 60N on guestion A6

[@chileshekangwaluo1960]

Do u teach in person like tuitions one on one?

[@THEDMSONLINESCHOOL]

No, I just started offering online tuitions. We are starting next Monday. Get in touch via WhatsApp line 0977924175 if interested. ❤️❤️❤️

[@severinochikwililwa3250]

Sir sorry why should we not divide by 1.6 so the we find the common mass on q4.

[@THEDMSONLINESCHOOL]

Which question are you talking about?

[@ethanmangs1098]

Question A17, why did you include the fan motor's power rating when they only said said,"calculate the cost of using the hair dryer for 2 hours"

[@THEDMSONLINESCHOOL]

I will look into that, i might have not noticed.

[@ceciliakapobe8921]

Question 4 u had used the gravity of earth 10n/kg instead of moon to find the mass

[@THEDMSONLINESCHOOL]

Because the question is asking to calculate the mass of the rock on earth, so we need to use the Earth's gravity.

[@zaheeruddin3459]

Sir what is the answer on 5.. u r saying it is d..but u marked c...?

[@THEDMSONLINESCHOOL]

It's d, the marking shifted from d to c by mistake. ❤️❤️❤️

[@zaheeruddin3459]

@@THEDMSONLINESCHOOLOkay sir... thank you..

[@godisking_03]

Where can we get the papers

[@chilengwangulube4028]

Hey sir, question A6 the force is 60N now how did you use 6N

[@THEDMSONLINESCHOOL]

That's an error on my part

[@pentysonmwansa114]

There is no answer there....the correct answer is 18Nm

[@lynettechipwende557]

Wow thank you so much Sir 🙏🙏

[@THEDMSONLINESCHOOL]

You are welcome and I appreciate your positive feedback ❤️❤️❤️

[@chilombomervis46]

Thank you very much sir 🙏

[@THEDMSONLINESCHOOL]

You are welcome ❤️❤️❤️

[@chilombomervis46]

Welcome sir

[@alicebanda5014]

On B6 (I)why did we use 2 instead of 4

[@THEDMSONLINESCHOOL]

question B6 has no (i). I don't understand the question you are referring to.

[@franciscahbwalya3545]

I am kindly asking for this paper if you have a soft copy and where can i download it sir

[@THEDMSONLINESCHOOL]

Contact me through my whatsapp line 0977924175.

[@AnnieMuchanga]

Powerful teacher

[@Geoffrey-h3r]

We choose any points to find the gradient

[@davymuzanga3692]

Hello sir if the bus was not moving at 2.2hours to 3 hours are you sure 4 hours is the average time of the journey

[@THEDMSONLINESCHOOL]

I don't the actual question you are referring to.

[@WanaMwamba]

Sir how do you make f the subject

[@williammwando3308]

Sir,on section b.Q9(b)i. You skip very fast I didn't see your answer.

[@THEDMSONLINESCHOOL]

Nuclear fragments.

[@PaulMwale-fe3xk]

Sorry sir, the graph you plotted of force against extension is not correct. On the given table, we don't have the values of extension. You were supposed to find the values of extension by the use of the equation E= final value - initial value.. Pointer reading doesn't represent extension

[@THEDMSONLINESCHOOL]

It's correct because 120 was set at zero. You are also correct. Try to plot it and see that the shape of the graph will be the same and other values also will be the same.

[@chazipanakawala8420]

Good evening sir hope I will get the answer I'm looking for,on c2,c is it to pick any coordinates or you pick where there is a straight line

[@modeccaimukana4322]

Yes please 🙏 nice question

[@AbrahamMwanza-cf8ky]

Wonderful day thanks

[@williammwando3308]

Sir on section c(2) Qd where is one come from

[@THEDMSONLINESCHOOL]

The one was present in the original formula provided in the question.

[@monicamulenga3674]

On question number 13 you said the answer is b but you have put answer C

[@THEDMSONLINESCHOOL]

You are right, the answer is b but the software I use moved the circle to c which was an error.

[@freemanbulawayo8560]

Q6 section A According to my eyes it sees force was 60n why did u write 6n??

[@THEDMSONLINESCHOOL]

I made an error.

[@giftmapoma3212]

Sir it is saying that the first station is not it ending at 3

[@chibalekatebe3371]

On question c2 on x axis why did you not start with 0 then followed by?20

[@THEDMSONLINESCHOOL]

When plotting values on the xoy plane, it does not mean that you always start from the origin or zero, you follow that data or values provided. So we were not provided with zero for us to start from zero.

[@NERD-POET]

Sir we were revising this paper with our teacher and I gave the answer you gave there on beta decay but he said we don't multiply there and maybe they just made a mistake in typing a question.just explain a bit there sir

[@THEDMSONLINESCHOOL]

Which question to be specific?

[@Mumba-e3c]

Keep it up sir

[@christenemulenga7392]

In question 6 the force given was 60N but when calculating you used 6N why

[@dorischitema201]

I dont understand where the 6 is coming from wen the force is 60

[@THEDMSONLINESCHOOL]

It was a type error.

[@yvettesampachitaluchibwe7804]

thank you very much sir

[@RatnaJaan]

Good ❤❤❤

[@austinahshamankomba8540]

Think nice and interesting, the problem is the word s and to small you can't read the words

[@THEDMSONLINESCHOOL]

Download the video and it will be clear. It's network causing them to look blurry.

[@rachealbanda2295]

How did you get the coordinate

[@THEDMSONLINESCHOOL]

Try to rewatch, I must have explained.

[@Michaelsilungwe]

Q4 is wrong the Mass of the object does not change both on earth and moon answer is 5kg

[@JoasMususuka]

hi.why did you write 0.3 instead of 30

[@TamaraChavula-v9u]

Kindly clarify on question 5

[@jacobsyambamba624]

On question A5 you said the answer is D but you chose C why

[@AstridahNakanyika]

Thanks for helping

[@ruthmwanza9216]

Sir please stop adding those words on the screen they are distracting and they are covering some things when u are solving please consider my comment

[@THEDMSONLINESCHOOL]

Sorry, that is not me adding those words, it's KZbin adding them automatically. So i will consider checking for settings and disable them. Thanks for letting me know because I didn't know KZbin had started showing them.❤️❤️❤️

[@EnockNkhoma-y5i]

Thanks very much sir