SEED PHYSICS PAPER II

本站添加: 2026-05-25

[00:00:01]Welcome learners.

[00:00:06]My name once again is Mr. Apocha your teacher.

[00:00:13]We meet now to revise the 2026 U paper from Sid.

[00:00:30]This is the mock paper, physics paper, practical which is paper two.

[00:00:39]All right, we are going to dwell on questions one and two only which are the descriptive questions.

[00:00:53]So welcome once again. In case you are watching us on our YouTube channel, consider subscribing to the channel so that you get our exam focused content to help you master practical skills and other skills too.

[00:01:26]It is only on this platform where you get high yield revision. Revision that will help you to produce the best results.

[00:01:39]We are premised on the fact that we have smart revisions to help you practice well and score highly in your MCE exams. Welcome learners.

[00:01:57]My name is Mr. Poora. Let me call you upon you to pay strict attention to the tips important tips for answering descriptive questions. Remember that for you to get a distinction in physics, you should do well both in both papers, paper one and paper two. So in paper two you have to get 10 out of 10 per question in all the 10 questions. This is 40 marks. That means you have to score 10 marks in each question.

[00:02:41]So we'll guide you. How do you make sure that you score 10 out of 10 question?

[00:02:56]Welcome learners.

[00:03:01]Invite your friends wherever they may be to join us so that they too can benefit from our high yield revisions.

[00:03:19]So without wasting your precious time, let us proceed to look Question number one is asking us to use a wellleled diagram to describe an experiment that can be used that can be done to verify hook slope.

[00:03:58]Hook's law. Right? So the examiner is assuming already that you know what Hook's law states because unless you know what Hook's law states, it will be difficult for you to describe this question to describe this experiment.

[00:04:24]All right. So what does hook slow state?

[00:04:32]Recall that hook slow has to do with springs and the materials in general.

[00:04:45]It states that the extension of the spring is directly proportional to the load on it.

[00:04:56]Provided the spring does not get damaged.

[00:05:02]Provided the spring is within what is called the elastic limit.

[00:05:10]As long as the elastic limit is not exceeded, the extension which is the increase in length of the spring is directly proportional to the force or to the load on the spring. Remember that load refers to weight of an object which is hooked or attached to the spring.

[00:05:38]So according to Hook's law, the higher the load, the higher the load on the spring, the greater would be the extension or increase in length. So we are asked to use a diagram well label diagram to describe this experiment to verify hook slope.

[00:06:07]To verify simply means to prove that indeed to confirm to confirm that indeed Hook's law is a valid law. It's valid.

[00:06:20]So what experiment can you carry out? We can do that. We can describe the experiment by use of a wellleled diagram.

[00:06:31]Wellleabled diagram.

[00:06:37]So such a diagram will look like this.

[00:06:45]Such a diagram look like this.

[00:07:04]All right. So the diagram that is required here is this one shown here.

[00:07:23]It's the one that you are supposed to draw or the candidates who are writing this exam were supposed to produce this diagram.

[00:07:39]very very important.

[00:07:45]So your examiners shall require you to draw the diagram as neatly as possible.

[00:07:58]Draw the diagram as neatly as you can using a pencil.

[00:08:06]Don't use ink when drawing this diagram or any other diagram in an exam. Use pencil.

[00:08:15]So you use pencil to draw the diagram.

[00:08:20]But you can label using ink. The labels can be in ink, but the diagram should be drawn in pencil. Take note of that. This is what many candidates would forget.

[00:08:40]So, as you're entering the exam, make sure you have an HB pencil to draw diagrams with.

[00:08:50]So draw a diagram as neatly as possible. Don't draw a short diagram, a sloppy diagram. Sloppy diagrams are boring when it comes to marking them.

[00:09:07]They're boring and awkward. If you draw a bad diagram, what's going to happen is that it will actually develop a negative attitude in the examiner and as a result the examiner will not mark your question as effectively as possible.

[00:09:29]All right, there's going to be uh a problem marking such a diagram. Make sure that your diagram is super neat.

[00:09:50]Draw a diagram which is super neat.

[00:09:54]Don't be sloppy.

[00:09:57]Draw as accurately as possible using pencil.

[00:10:04]But when you putting the labels the words these words use ink.

[00:10:10]So all these lines must be drawn in pencil.

[00:10:15]So when you have drawn your diagram accurately just by drawing an accurate diagram you already have got one mark for drawing an accurate setup or diagram. one mark and by labeling at least three parts you have two marks. So all together you'll have three marks for the diagram.

[00:10:47]So you have a spring here. You need a spring.

[00:10:50]You need a clamp to which the spring is hung.

[00:10:56]And you also need a stand to support your your setup.

[00:11:05]And you'll need a mass hooked to the diagram. I mean to the spring.

[00:11:21]When labing this diagram, we forgot to label the ruler.

[00:11:33]So that's the ruler.

[00:11:57]That's the welcome learners.

[00:12:15]So have Having drawn a correct diagram, now you have to refer to it.

[00:12:24]Whatever you say down here must make reference to the diagram.

[00:12:31]Now you are describing how you can verify the hook's law. How the diagram can be used to verify hook law. So whatever you are saying down here you have to refer to the diagram.

[00:12:54]So you proceed by saying set up the apparatus as shown above. So you are referring to the diagram that you just drew.

[00:13:04]All right. So this is the setup.

[00:13:10]Okay.

[00:13:13]So make sure whatever you're saying down here is making a reference to the diagram there.

[00:13:26]Do not give a description that does not speak to the diagram.

[00:13:42]Rich.

[00:13:54]Then measure the initial length of the spring.

[00:14:00]Measure the length the initial length of the spring.

[00:14:06]under zero mass. Meaning that before a mass is hang there.

[00:14:28]>> They're with him.

[00:14:29]>> They're with you.

[00:14:31]>> Yes, please.

[00:14:32]>> Yeah.

[00:14:35]Okay sir.

[00:14:39]So measure the length of the spring under zero mass.

[00:14:50]Meaning the length of the spring before mass is hang here.

[00:15:00]Using a meter ruler measure the initial length. Initial means the first length before mass a mass is hang there.

[00:15:11]So measure the initial length of the spring under the zero mass meaning that before mass is hang there.

[00:15:24]Then you add 100 g mass to the spring. this mass here to the spring attached to the clamp.

[00:15:38]Add 100 g mass to the spring attached to the clamp.

[00:15:52]All right?

[00:15:54]So, having added mass there, it means you see a change in the length of the spring. The spring is going to elongate.

[00:16:03]It's going to elongate or increase in length.

[00:16:07]So in this case you have two lengths.

[00:16:10]One length is before mass is hang here.

[00:16:16]The other mass the other length is when the mass is hang on this one.

[00:16:29]So you record the new length of the spring using the middle ruler which you have just measured.

[00:16:40]Record the new length of the spring.

[00:16:45]The new length of the spring is one that is produced by the mass. The mass being hung there will cause the spring to increase in length. So that's the new length.

[00:17:01]The initial length is one you measured before a mass is attached to the spring. The new length is the one that is due to the mass being hung there. This is going to to stretch down further down to give you a new length using these two lengths. Now you can find extension.

[00:17:28]Extension find the extension of the spring by subtracting the initial length of the spring from the final length of the spring.

[00:17:39]The final length minus the initial length will give us extension.

[00:17:45]Extension is simply the increase in length or the change in length. So the increasing length can be found by subtracting the initial length from the final length that will give you the extension.

[00:18:09]So you do the same you repeat steps C, D and E with different masses. In this case, 150 g, 200 g, 250 g, and 300 g. And record the results in a table of results, appropriate table of results.

[00:18:42]So for each mass, you calculate and record the extension of the spring.

[00:18:48]In the table of results, accurate and record extension of the spring in the table of results.

[00:19:07]So your table will show the masses starting with 100 g 150 g 250 g up to 300 in a column.

[00:19:20]And for each mass you have another column to show the new length.

[00:19:27]And then the other column is going to show extension. extension is obtained by subtracting the new length minus the initial length.

[00:19:46]So you have data now which you can use to plot a graph.

[00:19:53]So plot the graph of extension against applied force. The applied force is simply the weight of these masses.

[00:20:04]So in another column you'll have the weights these converted to weights if you are doing this practically any practical.

[00:20:21]Thank you sir.

[00:20:22]>> This is someone is praying that >> student >> I think so because They writing >> now and then they write history.

[00:20:36]>> Yes.

[00:20:37]>> After break >> so after break.

[00:20:42]>> Yes. Now I'm there.

[00:20:44]>> Okay.

[00:20:46]>> Yes sir. Thank you sir.

[00:20:51]So plot the graph of extension against applied force. The applied force here is not the masses.

[00:21:03]The applied force is going to be these masses changed to newtons.

[00:21:12]Let's see. If you are doing this practically, you need to change this to force or weight in Newtons. So this is 1.5 newtons.

[00:21:32]This is 2 newtons.

[00:21:36]This is 2.5 newtons up to 3 newtons.

[00:21:47]But don't convert this in this description. We are just looking at a situation where you are doing this practically. Your table of values will have to include the weight too in newtons.

[00:22:03]So these are newtons.

[00:22:11]The 100 g mass is 1 newton.

[00:22:19]This one you'll need these neutrons these weights if you are doing the actual practical experiment. Remember here we are just describing the experiment that can be done to show to verify hook's law.

[00:22:38]So these are the descriptions. Don't worry about these numbers the 1.5 in this description. You don't need these.

[00:22:45]Just proceed to say plot a graph. Plot the graph of extension against applied force.

[00:22:58]Plot the graph of extension against the applied force.

[00:23:04]So once you plot the graph, it is the nature of the graph that is going to guide you to make a valid conclusion regarding hook's law.

[00:23:19]So you conclude by saying that if the graph is a straight line through the origin then the extension of the spring is directly proportional to the load on the spring provided the limit of proportionality is not exceeded. So this is what Hook's law says.

[00:23:48]So this is the conclusion.

[00:23:51]So according to Hook's law, when you plot the values of extension against applied, the graph line must be a straight line.

[00:24:10]That's as long as the spring is not damaged. In other words provided the spring the limit of proportionality is not exceeded.

[00:24:22]Welcome learners. So this is what the candidates were expected to say. So let's see the allocation of marks.

[00:24:36]So for the diagram correct diagram one mark for correct diagram two marks for the label.

[00:24:51]So together here you have three marks three marks for the diagram.

[00:25:16]All right.

[00:25:18]By saying measure the initial length of the spring under the zero ma mass under zero mass. So measure measure what the spring they initialize one mark when there's no mass on it another mark.

[00:25:46]Add the 100 g mass to the spring attach. Okay, we can give this one mark.

[00:25:58]This instruction all of it one mark.

[00:26:04]Remember the total mark is 10.

[00:26:11]So this is one mark by saying add 100 g mass to the spring attached to the g. Add mass. That's one mark again.

[00:26:28]Then I record the new length of the spring. That's one mark.

[00:26:41]Find the extension of the spring by subtracting the initial length of the spring from the final. Find extension.

[00:26:49]One mark.

[00:26:54]Repeat the steps C to E for masses 150 200 250 300 g that's one mark calculate and record the extension of the spring in the table of results. So for each mass you can create extension.

[00:27:21]This is again one mark.

[00:27:24]Then plot the graph of the extension versus applied force.

[00:27:31]That's one mark.

[00:27:37]Then the conclusion if the graph is a straight line through the origin then the extension of the spring is directly proportional to the load by saying that if the graph is straight line through the origin that's one back then the extension of the spring is directly proportional to the load on the spring provided the limit of proportionality is not exceeded again that's one mark so al together you have three marks there for the diagram 4 5 6 7 8 9 10 11 so we have too many marks We can give the the diagram.

[00:28:46]If we give the diagram two marks, one mark for the correct diagram and one mark for the labels.

[00:28:59]So we have two marks there.

[00:29:07]Then three marks for saying measure the initial length. Three, then four, five.

[00:29:16]Let's see. Let's make sure that we don't overallocate marks. So we have two for the diagram, three, four, five, 6, 7, 8, 9, 10. All right, we have too many marks. So the last point we can just give it one and give it one mark. So that we have a total of one or 10 marks all together.

[00:29:42]So we have 1 2 3 4 5 6 7 8 9 10.

[00:29:58]So if you have done all these and you have satisfied the requirements of the question, you should be able to get 10 out of 10.

[00:30:09]Welcome learners.

[00:30:11]My name once again is Mr. Coach Lola, your teacher.

[00:30:17]Consider subscribing to our YouTube channel so that every time we upload a new video lesson, you are notified on time.

[00:30:31]Welcome to question number two.

[00:30:44]Question number two is asking us to describe an experiment.

[00:30:57]We are being asked to describe an experiment to show that sound cannot travel in a vacuum.

[00:31:05]Remember that a vacuum is an empty space which does not contain any particles.

[00:31:16]Space that does not contain any particles.

[00:31:21]Space that does not contain any solids whether gaseous or solid particles such a space is called vacuum.

[00:31:30]So we need to we asked to describe an experiment that we can do to show that sound does not travel in a vacuum. Remember that for sound to be produced there is need for particles to vibrate and in the absence of such vibrations sound cannot be produced. All right.

[00:31:58]There must be matter to transmit the vibrations to transmit the sound.

[00:32:06]Sound can travel through particles, gases, through liquids and solids but not in a vacuum. So how can we show that experimentally?

[00:32:20]One thing I need to point out is that this question does not ask us to use a diagram.

[00:32:29]When a question is silent about diagram, don't go ahead to draw one.

[00:32:39]It means you are violating the requirements of the question. The question is quiet is silent about diagram. Don't draw one.

[00:32:51]All right. So for this one we are just asked to describe the experiment without diagram but you can have a picture as to what diagram you need. Let's suppose that the question was asking you to use a diagram and the diagram you would need is something like this.

[00:33:12]Although the question is silent about diagram, you can sketch this somewhere on one of your rough papers if you have on day in the exam. Just sketch this to help you describe.

[00:33:26]That's what I would also do. Sketch this somewhere not as part of the answer but just somewhere to help me describe this experiment.

[00:33:38]So if the question is said with the end of a well label diagram this is the diagram that you will draw. So sketch it somewhere and then use it to describe but don't draw it as part of an answer.

[00:33:54]Take note don't draw it in the paper here. Draw it somewhere on a rough paper if you have. Sometimes you can have extra answer sheets. That's where you can scri scribble this or you can also just find some at the very back of your paper there you can find space where you can sketch this just to help you in describing this experiment but don't draw it as part of the answer here because the question has not said we should use a diagram.

[00:34:28]So in describing this experiment, so you have this diagram at the back of your mind.

[00:34:35]You begin by saying place the electric bell while you're looking at your rough diagram. Place the electric bell. This is the electric bell in a barrel jar.

[00:34:48]Barrel jar is this container here outside.

[00:34:54]Place the electric bell in a bell jar.

[00:34:57]That's how it begin. That's one mark already. I've started making marks. One mark by just saying this.

[00:35:09]Next, you go ahead to say switch on the electric bell and observe what happens.

[00:35:16]So, you are still referring to your sketch diagram.

[00:35:20]Switch on the electric bell and observe what happens if the sound is heard or not and record the results in the table of results.

[00:35:46]So one mark for say place the electric bear in a bel switch on the electric bell and observe what happens and record the results in the table in the table of results.

[00:36:11]Next you say pump the air out of the bell jar gradually meaning slowly to remove the air from the bell j that means you are creating a vacuum now you're creating a vacuum by sucking out air pumping out air from the bear from the jar here initially there's air there. All right.

[00:36:44]Okay. Now you pump the air out.

[00:36:50]Observe what happens. What is happening to the intensity of the sounds? You are now observing the amount of sound as the air is being removed. What is going to be happening in relation to the intensity of sound and observe what happens when all the air has been pumped out of the bell jar and record the results as is shown in the table here. So you sketch the table like this table of result just sketch right draw one you can draw one yes but don't fill up this part because you are just describing the experiment you have not yet made conclusion based on your observations. So you're just describing the experiment. So there will be no need no need to fill up these spaces unless you are actually doing the practical yourself.

[00:38:05]All right.

[00:38:07]This is just sketch table sketch of the table that you need to use.

[00:38:23]In the conclusion there you have to say state by giving a condition.

[00:38:32]If sound is held when there's air in the bell and is not held when there's no air in the bell, it means that sound cannot travel in a vacuum.

[00:38:46]So this is how you present your answer.

[00:38:50]Remember that the question did not specify did not spell out whether we need a diagram or not. So when there's no mention of diagram, don't draw one. I repeat that don't draw a diagram when the question is silent about a diagram.

[00:39:08]So this is what you are supposed to have said if you to write this exam yourself.

[00:39:13]So let's have a look at marks. Placing the electric bell in the jar. One mark.

[00:39:27]Switch on the electric bell and observe what happens.

[00:39:34]by saying switch on the electric bell.

[00:39:36]That's one mark.

[00:39:39]And observe one mark.

[00:39:44]Pump the air out of the bell jar gradually. One mark.

[00:39:52]And observe what happens. One mark again.

[00:39:59]And observe what happens when air is completely out of the bell is removed.

[00:40:07]One mark.

[00:40:13]Record the results in a table. One mark.

[00:40:18]So you have so far you have one, two, three, four, five, six, seven.

[00:40:30]Seven. Since we have already referred to the table here, you may not have to get you may not get max for saying this, but it is just adding value to your response above.

[00:40:44]If sound is held when there is air in the bell jar and is not held when there's no air in the bell jar. If sound is heard when there is air in the bell and is not held when there is no air in the bel that's one mark.

[00:41:05]Then it means that sound cannot travel in a vacuum. That's another mark.

[00:41:12]So don't make a conclusion that says it will be observed that when air is removed from the bure sound is not heard. No don't say that it will be observed that sound will be heard when air is okay. What I'm I'm saying is avoid saying it will be observed that such conclusions are not acceptable.

[00:41:43]All right. Your conclusion must start with if if sound is held when there is air in the bell jar and is not held when there is no air in the bell jar. That's that's how you conclude um your descriptive essays. Unless you are asked being asked to describe how you can prepare something or unless you are asked to describe how something works that's different. But where you are looking at the effects the cause effect relationship you should end your conclusion by saying if this then that.

[00:42:31]Even the previous question we said if the line is straight the graph line is straight then it means that hook law is verified. So be careful there when concluding. So once again this is a 10 marks question. Let's verify we have 1 2 3 4 5 6 7 8 9 10. 10 marks all together.

[00:43:08]Welcome learners.

[00:43:10]So that's all we can say for this paper.

[00:43:15]In case you have questions, don't hesitate to send me a text message to WhatsApp. My WhatsApp number. I'm sure you have found so far you know my number from the Other videos of course in this video I've not given the number but the other videos are spelling out the number very well for you to send your inquiries questions how you can enroll into our classrooms.

[00:43:44]Welcome learners for the time being I wish you all the best expecting to meet you again. Keep revising, keep pushing.

[00:43:57]I trust in you. Hard work. Your hard work will pay. Your hard work will pay you. Bye-bye for now.