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    Physics - Part 1

    Physics - Part 1

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    Speed as well as accuracy is important in this section. Work quickly, or you might not finish the paper. There are no penalties for incorrect responses, only marks for correct answers, so you should attempt all questions. Each question is worth one mark.

    You must complete the answers within the time limit. Calculators are NOT permitted.

    Good Luck!

    Power 

    Power (W) = Work done (j) / time (s)

    Or

    Power (W) = energy transferred (j) / time (s)

    1. If a woman pushes a child in a pram for 10 minutes to reach the shops from her home and uses 600 joules of work to do so, what is her power?
    • 4
    3

    Explanation

    The correct answer is B.

    10 minutes is 600 seconds, 600 joules over 600 seconds is 1W of power.

    Post Comment
    guest Medicmind Tutor

    Sat, 28 May 2022 18:43:39

    this would definitely NOT be a type of question featured in the exam

    Power 

    Power (W) = Work done (j) / time (s)

    Or

    Power (W) = energy transferred (j) / time (s)

    2. What can be regarded as the correct definition of power?
    • 3
    2

    Explanation

    The correct answer is D.

    Candidates may select the wrong answer if they do not read each option correctly and consider the equation of power.

    Post Comment
    Hyoshin Medicmind Tutor

    Thu, 27 Oct 2022 04:53:29

    May I clarify what the difference between options C and D is? Thank you.

    Power 

    Power (W) = Work done (j) / time (s)

    Or

    Power (W) = energy transferred (j) / time (s)

    3. Which of the following would have the greatest impact to increase the power transfer by the woman pushing the pram?
    • 0
    1

    Explanation

    The correct answer is A.

    If the woman increases her pace she will produce 1.25W of power. The other options will not increase power.

    Post Comment

    Power 

    Power (W) = Work done (j) / time (s)

    Or

    Power (W) = energy transferred (j) / time (s)

    4. What is the unit Watt defined as?
    • 0
    0

    Explanation

    The correct answer is C.

    Looking at the equation candidates should be able to determine the correct unit without difficulty.

    Post Comment
    guest Medicmind Tutor

    Sat, 28 May 2022 18:44:22

    Again, this would definitely NOT be a type of question featured in the exam

    Electricity and circuit

    Voltage = Current x Resistance

    5. What is the current flowing through the 50 ohms resister? Round to the nearest whole number
    • 3
    2

    Explanation

    The correct answer is B.

    Find the resistance of the two resisters in parallel (1)/((1/40)+(1/60)) = 24. Ass 50 and 24 to find the total equivalent resistance of the circuit = 74. Now use Ohms law to calculate the current 150/74 = 2.03, round appropriately and the answer is 2 Amps.

    Post Comment
    Niamh Medicmind Tutor

    Fri, 24 Feb 2023 05:22:47

    Why am I adding 24?

    Niamh Medicmind Tutor

    Fri, 24 Feb 2023 05:23:10

    Oh nevermind

    mary Medicmind Tutor

    Fri, 24 Feb 2023 14:36:52

    you cannot get this answer without a calculator

    Musibe Medicmind Tutor

    Thu, 16 Mar 2023 11:25:27

    @Mary. Hahaha very challenging

    Electricity and circuit

    Voltage = Current x Resistance

    6. How would double the size of the resister affect its resistivity?
    • 2
    8

    Explanation

    The correct answer is C.

    Resistivity is an intrinsic property and therefore even when the surface area of the medium changes the resistivity does not change.

    Post Comment
    Stephanie Medicmind Tutor

    Thu, 10 Feb 2022 06:03:38

    This is a terrible wording of the question and serves only as a good warning to students for potential trick questions. I assumed that the word "size" meant the number or the Ohms value, same as when you say the size of a USB is doubled, we mean the capacity. It should be made clear that size here means physical size.

    Will Medicmind Tutor

    Wed, 22 Feb 2023 11:14:31

    This is not a well worded question. As double in size could be assumed to mean double in radius. R = ρl/A, with A = pi * r^2, means that double the radius results in a quarter of the resistance.

    David Latimer Medicmind Tutor

    Tue, 12 Mar 2024 12:54:50

    Poorly worded question.

    Max Medicmind Tutor

    Mon, 22 Apr 2024 10:43:16

    I concur with all previous comments about the poorly worded nature of this question. It should at least be properly worded as "doubling" and not "double" in that sentence

    Electricity and circuit

    Voltage = Current x Resistance

    7. Consider the circuit above and select between which points would be the most appropriate place to add an ammeter to measure the current of the circuit?
    • 0
    8

    Explanation

    The correct answer is D.

    Ammeters would most effectively measure current when there is not a significant change in voltage, between points A and B there would not be a significant change in voltage.

    Post Comment
    Thomas Medicmind Tutor

    Thu, 26 Aug 2021 11:20:37

    I cannot see the labels (abcd) on the diagram

    Thiyagu Mohan Medicmind Tutor

    Thu, 30 Sep 2021 12:07:09

    I can't see the labels on the diagram

    Sam Medicmind Tutor

    Tue, 15 Feb 2022 12:45:33

    No one can see the labels because they are not there.

    Guest Medicmind Tutor

    Sat, 28 May 2022 19:10:51

    I can see labels

    Musibe Medicmind Tutor

    Thu, 16 Mar 2023 11:28:43

    I can clearly see labels

    Gases

    8. A vessel is fitted with a piston which is airtight and can move up and down freely. There is 1mol of gas in the vessel under the piston with a pressure of 100kPa when the piston rests 10cm from the vessel base. As a force of 5N is applied to the piston the pressure in the vessel doubles. In light of this what would the new position of the piston from the base of the vessel be?
    • 0
    9

    Explanation

    The correct answer is A.

    Post Comment
    Stephanie Medicmind Tutor

    Thu, 10 Feb 2022 08:50:08

    How about you EXPLAIN why the answer is what it is.

    Ethan Medicmind Tutor

    Mon, 23 Jan 2023 11:02:29

    If my explanation is wrong, correct me, but the answer is 5cm because as the pressure doubles, I reasoned there must be an inverse relationship to the position of the piston, meaning that the new position in 5cm.

    Mohamed Mohamed Medicmind Tutor

    Thu, 20 Jul 2023 10:29:11

    Where has this answer came from

    Gases

    9. What would happen to the position of the piston in relation to the base of the vessel be if 7.5N of pressure were applied?
    • 0
    4

    Explanation

    The correct answer is C.

    Post Comment
    jon Medicmind Tutor

    Tue, 08 Feb 2022 21:52:29

    can someone explain it please

    Stephanie Medicmind Tutor

    Thu, 10 Feb 2022 08:50:26

    How about you EXPLAIN why the answer is what it is.

    Sam Medicmind Tutor

    Tue, 15 Feb 2022 12:49:08

    Basically, in the previous question they told us that a force of 5N made the pressure double. So if the Piston was 10cm from the base, it would logically now need to be 5cm from the base to double the pressure (halving volume doubles pressure). So this means that a force of 1N pushes the piston down 1cm. Therefore a force of 7.5N will push it down 7.5cm making it (10-7.5) 2.5cm from the base.

    Sam Medicmind Tutor

    Tue, 15 Feb 2022 12:50:29

    I love how in the explanation it says the correct answer is C. Good job

    Gases

    10. What would the pressure in the vessel be when 7.5N of pressure were applied?
    • 1
    5

    Explanation

    The correct answer is C.

    Post Comment
    Stephanie Medicmind Tutor

    Thu, 10 Feb 2022 08:50:32

    How about you EXPLAIN why the answer is what it is.

    Petunia Medicmind Tutor

    Fri, 18 Feb 2022 04:36:22

    I need an explanation as well

    Ethan Medicmind Tutor

    Mon, 23 Jan 2023 11:07:13

    In a previous question, we found out that when 5N of force is applied, the pressure doubles from 100pKa to 200pKa (an increase of 100pka). If we halve 5N to 2.5 N we can expect an increase of 50pKa. 5N+2.5N = 7.5N so the increased pressure must be 250pKa

    Gases

    11. The gas is changed for one that has a pressure of 500kPa when the piston is at rest, what would the pressure increase to under 1N of force?
    • 1
    1

    Explanation

    The correct answer is D.

    For this question stem candidates should use Boyle’s Law – P1V1 = P2V2. Candidates should also be able to reason the answers for the questions using logic.

    Post Comment
    Mitch Medicmind Tutor

    Fri, 18 Mar 2022 07:54:23

    If we use P1V1 = P2V2 what are the other elements of the equation? Where's the Vs?

    Thermal energy

    There are three ways through which heat can move: convection, conduction and radiation.

    12. What is the correct definition for conduction?
    • 0
    0

    Explanation

    The correct answer is A.

    Candidates should be able to identify faults in statements B, C and D.

    Post Comment
    Stephanie Medicmind Tutor

    Thu, 10 Feb 2022 06:07:16

    Please explain why B, C and D are wrong.

    Thermal energy

    There are three ways through which heat can move: convection, conduction and radiation.

    13. What is the correct definition for convection?
    • 0
    0

    Explanation

    The correct answer is C.

    Candidates should think carefully here and consider the inaccuracies present in the three other statements. 

    Post Comment

    Thermal energy

    There are three ways through which heat can move: convection, conduction and radiation.

    14. What is the correct definition for thermal radiation?
    • 0
    0

    Explanation

    The correct answer is B.

    Candidates should think carefully about what the correct form of energy heat is radiated in to answer this question. Candidates should also recall that electromagnetic radiation encompasses 7 energy forms.

    Post Comment

    Thermal energy

    There are three ways through which heat can move: convection, conduction and radiation.

    15. What is the correct definition for heat?
    • 0
    12

    Explanation

    The correct answer is A.

    Candidates may be inclined to choose option B but it is important they remember that temperature and heat are two different concepts.

    Post Comment
    guest Medicmind Tutor

    Sat, 28 May 2022 19:14:35

    RIP to those who selected C, which included me

    Physics - Part 1 Review Screen

    Instructions

    Below is a summary of your answers. You can review your questions in three (3) different ways.

    The buttons in the lower right-hand corner correspond to these choices:

    1. Review all of your questions and answers.
    2. Review questions that are incomplete.
    3. Review questions that are flagged for review. (Click the 'flag' icon to change the flag for review status.)

    You may also click on a question number to link directly to its location in the exam.

    Physics - Part 1 Section

    Final Answer Review Screen

    Instructions

    This review section allows you to view the answers you made and see whether they were correct or not. Each question accessed from this screen has an 'Explain Answer' button in the top left hand side. By clicking on this you will obtain an explanation as to the correct answer.

    At the bottom of this screen you can choose to 'Review All' answers, 'Review Incorrect' answers or 'Review Flagged' answers. Alternatively you can go to specific questions by opening up any of the sub-tests below.

    Physics - Part 1 Section

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