Close
Close

Login here to access/preview our exam papers, or sign up now for your free membership!



2011
Fri
11
Nov
Little Miss Loi avatar

GCE O Level 2011 Oct/Nov Physics 5058 (MCQ) Paper 1 Suggested Answers & Solutions

(96)
Tuition given in the topic of Little Miss Loi the Science Tutor (archived) from the desk of Little Miss Loi at 9:38 am (Singapore time)

Hello again everyone,

After having taken possession a certain booklet, I’m sitting in my sister’s car, looking up at the bright blue morning sky, while sending out this series of codes:

Q1-10CCBCB AACCB
Q11-20DCBDB CBADA
Q21-30ACABC BCBAB
Q31-40DCBDA BDDAD

Note: Answer for Q33 has been changed to B. Sorry for the misinformation! 🙁

Do they tally with yours?

Update: The list of workings and explanations for each of the answers (where applicable) have been compiled (along with the questions at the end)!

You may access here by clicking the Like button (if you haven’t yet done so).

Latest version: 1.1: Q38 – corrected typo and updated explanation
GCE O Level 2011 Physics 5058 Paper 1 solutions

2011 O-Level October/November Physics 5058 Paper 1 Suggested Solutions

Hopefully this will help in some way to settle some of the debates regarding some of the answers (and hopefully not create more in the process!)

Good luck for those of you with your remaining Science MCQ papers! ALMOST THERE!!!

頑張って!!!

Revision Exercise

To show that you have understood what Miss Loi just taught you from the centre, you must:

  1. Leave A Comment!
Comments & Reactions

84 Comments

  1. YQ's Avatar
    YQ commented in tuition class


    2011
    Nov
    11
    Fri
    10:05am
     
    1

    for ques 11, I thought that the answer should be B? cuz only a stretched spring will have elastic potential energy... so at Q is potential and at P is kinetic?

  2. Wong Xin Hui's Avatar
    Wong Xin Hui commented in tuition class


    2011
    Nov
    11
    Fri
    10:17am
     
    2

    Hello. Thank you for providing answers(: However, I thought for question 6, the answer should be A? Only when all the arrows point in one direction, there will be no resultant force. As the nail does not move, so, that means there is no resultant force, right? (:

  3. HP's Avatar
    HP commented in tuition class


    2011
    Nov
    11
    Fri
    10:20am
     
    3

    Why is Q6 D? Shouldn't it be A? Since the nail does not move.

  4. Nguyễn Dũng's Avatar
    Nguyễn Dũng commented in tuition class


    2011
    Nov
    11
    Fri
    10:26am
  5. Rachel's Avatar
    Rachel commented in tuition class


    2011
    Nov
    11
    Fri
    10:30am
     
    5

    Can you relook Q30? I thought current passes through only one resistor. And also for Q37, cos I still get answer D.



    • 2011
      Nov
      11
      Fri
      10:48am
       
      5.1

      @Rachel: For Q30, answer is B as the current comes out from the alternating current supply, it can go through all four resistors if it travels in the clockwise direction, but when in the anti-clockwise direction the current cannot pass through the resistors which are along the same route as the diode.

      Hence only 2 resistors carry the current in 2 directions, and the resistors adjacent to the diode carry current in ONE direction only

      As for Q37, the answer is amended to D - thanks for highlighting!

      *drawing a diagram to illustrate now*

      ...

  6. fb's Avatar
    fb commented in tuition class


    2011
    Nov
    11
    Fri
    10:38am
     
    6

    Thanks for the answers!
    For qn37, I calculated the voltage and got D as my answer. How to calculate the voltage for qn37?

  7. fb's Avatar
    fb commented in tuition class


    2011
    Nov
    11
    Fri
    10:42am
  8. hi's Avatar
    hi commented in tuition class


    2011
    Nov
    11
    Fri
    10:48am
     
    8

    hi:) thx for the ans but i i ask why qn 37 is b instead of d??

  9. Jay's Avatar
    Jay commented in tuition class


    2011
    Nov
    11
    Fri
    10:51am
     
    9

    Can someone do an explanation for 37?

    Using Np/Ns = Vp/Vs, my best guess is B
    Vp/Vs = 12V/6V = 2
    So... Np/Ns must be 1000/500 = 2

    ~

  10. hy's Avatar
    hy commented in tuition class


    2011
    Nov
    11
    Fri
    10:51am
     
    10

    should question 33 be B?

    When a person touches the live wire the fuse will not blow as a person has a very high resistant. Hence, the current flowing should be low.

  11. Ng Thengwei's Avatar
    Ng Thengwei commented in tuition class


    2011
    Nov
    11
    Fri
    10:57am
  12. anonymous's Avatar
    anonymous commented in tuition class


    2011
    Nov
    11
    Fri
    11:20am
     
    12

    if the answers here are right, my mark should be 37/40 which should be alright. I have a question though. For question 39, my friends say the answer is option B but i wrote option D which tallies with your answer. Can you explain question 39? I don't really understand. And for question 36, why is the answer B? Please enlighten me. THANKS!

  13. IP's Avatar
    IP commented in tuition class


    2011
    Nov
    11
    Fri
    11:33am
     
    13

    For question 23, answer is A because the ray bends inwards aft passing through the lens?

  14. Jeffrey Lim's Avatar
    Jeffrey Lim commented in tuition class


    2011
    Nov
    11
    Fri
    11:38am
  15. ces's Avatar
    ces  commented in tuition class


    2011
    Nov
    11
    Fri
    11:56am
     
    15

    why is the answer for qn 23 A instead of C?

  16. Hazle's Avatar
    Hazle commented in tuition class


    2011
    Nov
    11
    Fri
    11:58am
     
    16

    Hi Miss Loi. For question 38, why will the brightness of L1 remain the same(option D)? Since current flowing through L1 decreases when the resistance of the LDR decreases.



    • 2011
      Nov
      11
      Fri
      12:05pm
       
      16.1

      @Hazle: The brightness of the lamp is dependent on the potential difference across the lamp, which is held constant by the battery connected in parallel to it.

      Though the resistance is changed in the circuit, the current flowing though the resistors also changes, so it's a better gauge to look at p.d instead of current.



      • 2011
        Nov
        11
        Fri
        12:11pm


      • 2011
        Nov
        14
        Mon
        12:43pm
         

        @Little Miss Loi: SQhi objects!

        Just so you, know, guys, I took the same paper =)

        IMHO, the brightness of the bulb should be dependent on the power output of the bulb, and we know that P=IV

        I assume everyone has a copy of the paper here.

        Let's call the branch on the left with L1 Branch A, and the branch on the right with resistor R & L2, Branch B.

        Miss Loi, as you have stated, since Branch A and Branch B are parallel, they would have the same pd as the emf of the battery remains unchanged.

        Hence, the decisive factor should be current instead.

        Now, as light intensity increases, resistance of R decreases, thus, the overall resistance of the circuit decreases. The resistance of Branch B also decreases, and the current flowing through Branch B increases.

        Hence, as Branch B draws a greater current, the current Branch A draws decreases. Hence, by P=IV, the brightness of bulb L1 would decrease.

        Oh well, one more bio and one more literature paper to go. JY everyone!!!

        P.S.:
        If you wonder why the brightness of L2 decreases, as resistance of R decreases, the pd across r decreases (Little Miss Loi edit: you mean increases?) hence pd across L2 increases, leading to higher power output. It's kind of "common-sensical" anyway=)



        • 2011
          Nov
          14
          Mon
          5:01pm
           

          @SQhi: Little Miss Loi objects!!!!!

          Yes, as SQhi has said, the brightness of the bulb ultimately depends on its power which in turn is dependent on the current flowing through it.

          Now, as light intensity increases, resistance of R decreases, thus, the overall resistance of the circuit decreases. The resistance of Branch B also decreases, and the current flowing through Branch B increases.

          This is true BUT this reduced overall resistance will also lead to an INCREASE in the overall current drawn by the circuit.

          Hence, as Branch B draws a greater current, the current Branch A draws decreases. Hence, by P=IV, the brightness of bulb L1 would decrease.

          Yes Branch B will definitely draw a greater current due to the reduced resistance of R, so L2 will increase in brightness.

          However, Branch A's current will remain the same given that 1) its pd is unchanged 2) the resistance of L1 is unchanged. So by Ohm's Law, the current through Branch A remains unchanged as well.

          I've taken the liberty to sub in some arbitrary p. d. and resistance values just to demonstrate this. As you will see, Branch A's current stays constant due to the increased overall current drawn by the circuit, even though Branch B's current has increased.

          O Level 2011 Physics MCQ Q38 illustrative diagram

          In short, Ohm's Law will always sort itself out 😉

          P.S. This reminds me to update the pdf file - there's a typo for the answer to Q38!



          • 2011
            Nov
            14
            Mon
            8:45pm
             

            @Little Miss Loi: Opps, typo in my post-note, sorry!(thanks for the correction!)
            Anyway ya, that was for other visitors, not you =)

            D= I have never considered Q38 from that angle...

            D= My O level physics is in jeopardy!!! Serious, nerve-wracking jeopardy...

            Yet, it feels so good to finally understand this, coz i expect myself to...

            Anyway could you let me know how to type subscript and superscript in these comments, and how I could edit my own posts?

  17. Zhi Jie's Avatar
    Zhi Jie commented in tuition class


    2011
    Nov
    11
    Fri
    12:00pm
     
    17

    i believe qn 22 and 23 are wrong. qn22 shld be B since is sin (air) / sin ( glass) =1.5 and qn we shld be C since its converging lens while the other 3 options are all diverging lens

  18. Sad day's Avatar
    Sad day commented in tuition class


    2011
    Nov
    11
    Fri
    12:29pm
  19. Jolene Lim's Avatar
    Jolene Lim commented in tuition class


    2011
    Nov
    11
    Fri
    12:37pm
     
    19

    Shouldn't the last question answer be 'C' because they are asking you about the frequency of the input of the cro, so it should be only about the screen and not counting the number of waves.

  20. fb's Avatar
    fb  commented in tuition class


    2011
    Nov
    11
    Fri
    12:55pm
  21. anon's Avatar
    anon commented in tuition class


    2011
    Nov
    11
    Fri
    12:58pm
  22. Ian Pang's Avatar
    Ian Pang commented in tuition class


    2011
    Nov
    11
    Fri
    2:50pm
     
    22

    HI... can u explain to me why the ans for qn 33 is C? thks:)

  23. Cheryl's Avatar
    Cheryl commented in tuition class


    2011
    Nov
    11
    Fri
    5:51pm
     
    23

    ARGH.. i feel very extremely stupid after looking at this.. and how come everyone's so smart...

  24. Dannie's Avatar
    Dannie commented in tuition class


    2011
    Nov
    11
    Fri
    5:52pm
     
    24

    qn11: my ans was C---becos when u move down spring, elastic potential stored at Q. When u release it is converted to kinetic energy, so at P gt kinetic energy.

  25. Benson Dannie's Avatar
    Benson Dannie commented in tuition class


    2011
    Nov
    11
    Fri
    6:00pm
     
    25

    for qn 26, i got D as answer.
    becos Npole created in left of solenoid and south pole at right side.
    so, poles induced in rods should be opoosite to poles in solenoid.
    eg. Pshould be south, which is opposite to noth pole of solenoid.
    so, i gt D as ans. pls comment ty

  26. Dennis's Avatar
    Dennis commented in tuition class


    2011
    Nov
    11
    Fri
    8:55pm
     
    26

    Hi, for question 33, could you explain why the option is C and not B?? Much appreciated!

  27. Skyhigh's Avatar
    Skyhigh commented in tuition class


    2011
    Nov
    11
    Fri
    9:24pm
     
    27

    Hi Miss Loi, can you explain your ans for qns 33 please.. i chose A too

  28. Chloe's Avatar
    Chloe commented in tuition class


    2011
    Nov
    11
    Fri
    10:29pm
  29. Loi's Avatar
    Loi commented in tuition class


    2011
    Nov
    11
    Fri
    11:09pm
  30. marc's Avatar
    marc commented in tuition class


    2011
    Nov
    12
    Sat
    5:19am
  31. Poo's Avatar
    Poo commented in tuition class


    2011
    Nov
    12
    Sat
    9:04am
     
    31

    For question 33, i checked the internet and the answer should be B... It does not blow for the first three cases and blows for the last 2. When the person touches the live wire, however, he gets an electric shock but the fuse does not blow. I found the exact question here... http://sg.answers.yahoo.com/question/index?qid=20100312012525AA1rEAC
    Can you help to confirm this? Thanks

  32. radha's Avatar
    radha commented in tuition class


    2011
    Nov
    12
    Sat
    10:21am
     
    32

    Hi Ms Loi, i think the ans for qn 33 must be B since as the fourth n fifth option will definitely result in blown fuse but for person touching live wire it's debatable because if current can flow through him with low resistance then the fuse will blow if normal case where resistance is high in human the fuse will not blow.

  33. jess's Avatar
    jess commented in tuition class


    2011
    Nov
    12
    Sat
    10:38am
     
    33

    Hi what is the safest mark for this paper?

  34. Leon's Avatar
    Leon commented in tuition class


    2011
    Nov
    12
    Sat
    12:48pm
     
    34

    Hi, for qn 6, why is the ans A? Pls enlighten thanks 🙂 shouldn't the tension of the string be in the opposite direction as the pull of the string?

  35. Little Miss Loi's Avatar
    Little Miss Loi commented in tuition class


    2011
    Nov
    12
    Sat
    1:26pm
     
    35

    Good morning (oops should be good afternoon) everyone!

    I'll have to agree with the chorus of protests regarding Question of the Year Q33 and changed the answer to B (sorry for the misinformation!)

    The main issue here is whether the 3A fuse will blow if a person touches the live wire.

    A typical home appliance say, a kettle, will typically have a resistance of around 20-50 Ω, and under normal operation will draw an operating current < 3A (else the fuse will blow).

    The human body, on the other hand, will have a resistance of 500 Ω to 1000 Ω to even 1 000 000 Ω (depending on conditions - some researched values are provided here). No matter what value we take, this resistance is at least a few orders of magnitude higher than the resistance of typical appliance and hence will draw a lower current to flow to it.

    But since a current as little as 10 mA is already enough to cause an electric shock, the person who touches the live wire will, in all likelihood, turn into Street Fighter Blanka suffering an electric shock with the fuse staying helplessly intact (as shown in the diagram below)!

    O Level Physics MCQ Q33 diagram

  36. Bell's Avatar
    Bell commented in tuition class


    2011
    Nov
    12
    Sat
    4:35pm
     
    36

    Why is qn 39 a? Shouldn't it be b since the thermistor can decrease it's resistance to 0 as it is heated? So houldnt the output voltage decrease to 0 as it's heated?



    • 2011
      Nov
      13
      Sun
      11:40pm
       
      36.1

      @Bell: All thermistors have an operating temperature range which in turn will determine each of their upper and lower resistance limits.

      The lower resistance limit, however, will never be zero due to the makeup of its electrical components and materials. If you dwell deeper, you'll find that the relationship between resistance and temperature is actually exponential.

      And if you were to Google "thermistor resistance vs temperature chart" and view the images, you'll see in all the graphs that, given the exponential nature of this relationship, the resistances approaches zero as temperatures increases but will never reach zero.

  37. sammy's Avatar
    sammy commented in tuition class


    2011
    Nov
    13
    Sun
    9:20am
  38. Casper's Avatar
    Casper commented in tuition class


    2012
    Apr
    16
    Mon
    7:59pm
     
    38

    I found this really useful...

    I was looking for the Physics 5058 2011 question paper but I couldn't find it.. Can some one please tell me where it is?

    Thanks

12 Reactions



  1. 2011
    Nov
    11
    Fri
    1:51am
  2. Tweetback
    ♔yipszeki tweeted


    2011
    Nov
    11
    Fri
    1:56am
     
    40

    http://t.co/qtGl9Ck5 even though I don't take pure phy, but still... Here! Answers 🙂

  3. Tweetback
    Elmira tweeted


    2011
    Nov
    11
    Fri
    2:31am
  4. Tweetback
    Bernice Tan tweeted


    2011
    Nov
    11
    Fri
    2:45am
  5. Tweetback
    Charissa Lee tweeted


    2011
    Nov
    11
    Fri
    2:45am
  6. Tweetback
    Daphne Lee tweeted


    2011
    Nov
    11
    Fri
    3:14am
  7. Tweetback
    Sean Lim tweeted


    2011
    Nov
    11
    Fri
    3:31am
  8. Tweetback
    tweeted


    2011
    Nov
    11
    Fri
    3:41am
     
    46

    @taectoo RT @yyumlicious: http://t.co/aYs90xas even though I don't take pure phy, but still... Here! Answers 🙂

  9. Tweetback
    Qingwan Kuah tweeted


    2011
    Nov
    11
    Fri
    4:44am
     
    47

    answers for physics paper 1! RT @MissLoi: Retweet This Blog Post http://t.co/4Q6KKckr

  10. Tweetback
    SYR tweeted


    2011
    Nov
    11
    Fri
    7:28am
     
    48

    RT @MissLoi: Tally your Physics MCQ answers here? http://t.co/CmLQTULe #olevel



  11. 2011
    Nov
    11
    Fri
    9:14am


  12. 2011
    Nov
    12
    Sat
    10:41am
     
    50

    [...] DCCDA BDDAD from : https://www.exampaper.com.sg/little-miss-loi-the-science-tutor/gce-o-level-2011-oct-nov-physics-5058-...  PS: I think q 23 is wrong? D: i got C. Ooh wrong 4 qn or so. . Not bad for one who never got [...]

Post a Comment

  • * Required field
  • Your email will never, ever be published nor shared with a Nigerian banker or a pharmaceutical company.
  • Spam filter in operation.
    DO NOT re-submit if your comment doesn't appear.
  • Spammers often suffer terrible fates.
*
*

Impress Miss Loi with beautiful mathematical equations in your comment by enclosing them within alluring \LaTeX [tex][/tex] tags (syntax guide | online editor), or the older [pmath][/pmath] tags (syntax guide). Please PREVIEW your equations before posting!

CommentLuv badge
 

 

Whatsapp Instagram Twitter Facebook Close Search Login Access RSS Joss Sticks Sessions Suggested Solutions Preview O Level Additional Mathematics O Level Elementary Mathematics Secondary Three Additional Mathematics Secondary Three Elementary Mathematics Secondary Two Mathematics Secondary One Mathematics Additional Mathematics 4038 Additional Mathematics 4018 Elementary Mathematics 4017 Virus Zoom