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GCE O-Level 2009 Oct/Nov Combined Science (Physics/Chemistry/Biology) MCQ Paper 1 Suggested Answers & Solutions

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Tuition given in the topic of Little Miss Loi the Science Tutor (archived) from the tuition centre desk of Little Miss Loi at 11:58 am (Singapore time)

OK after a long, long night here are my suggested answers for the Combined Science (Physics, Chemistry) 5116 and (Physics, Biology) 5117 MCQ Paper 1 (along with the usual workings, diagrams and explanations).

Those of you taking other combinations (e.g. Chemistry/Biology 5118) in this ‘O’ Level should probably encounter the same set of 20 Physics or 20 Chemistry or 20 Biology MCQs.

O-Level 2009 October/November Combined Science 5116 Paper 1 Suggested Solutions O-Level 2009 October/November Combined Science 5117 Paper 1 Suggested Solutions
2009 O-Level Oct/Nov Combined Science MCQ Paper 1 Suggested Solutions
Physics/Chemistry 5116 (left) & Physics/Biology 5117 (right) – click to download

Hope the explanations will clear up some doubts in the argument discussion with your friends on whether it’s “B or C” or “A or B or C or D” (?!) Once again, please leave a comment if you spot any mistake, typo and/or wish to clarify any of the explanations given.

All of you should be rejoicing now in your new-found freedom. Unfortunately not for me though :( *looks over shoulder at my sister*

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Revision Exercise

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Comments & Reactions

14 Comments

  1. jasper's Avatar
    jasper commented in tuition class


    2009
    Nov
    13
    Fri
    4:24pm
     
    1

    Physics/Chemistry paper 1 5116 answers cannot be accessed

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


    2009
    Nov
    13
    Fri
    4:40pm
     
    2

    Hi jasper,

    That's strange as it looks fine on our side. Which version of Adobe Reader are you using?

    Are you able to view other pdf files (like 5117 etc.) on this site? Are you getting an error message like the "the file is damaged and cannot be repaired" which another student has reported earlier?

    Any one else having trouble accessing the solutions?

  3. GX's Avatar
    GX commented in tuition class


    2009
    Nov
    13
    Fri
    4:44pm
     
    3

    Hey Miss Loi, do you have the solutions for pure Biology p1 and pure Chemistry p1 too?

  4. Matthewese's Avatar
    Matthewese commented in tuition class


    2009
    Nov
    13
    Fri
    7:05pm
     
    4

    Miss loi, i think for chemistry MCQ , the answer for question 36 should be C?
    Reason : Crude oil undergo Fractional distillation to seperate the hydrocarbons in it and not cracking.
    Please correct me if i am wrong (:

  5. Gwen lee's Avatar
    Gwen lee commented in tuition class


    2009
    Nov
    13
    Fri
    7:42pm
     
    5

    ya.. i think is fractional distillation ..

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


    2009
    Nov
    13
    Fri
    9:05pm
     
    6

    Oh thanks Matthewese and Gwen for pointing out Q36, and the answer has been updated.

    Yes it should be C as crude oil is first separated into into fractions by fractional distillation. Some of these fractions then undergo a further cracking process to break them down into smaller fractions. This has sometimes been loosely termed as "crude oil cracking" - a term that I errorneously recalled when I did the question :?

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


    2009
    Nov
    14
    Sat
    7:21pm
     
    7

    GX: OK the Chemistry & Biology Paper 1 solutions are finally up! ;) And I hope jasper will be able to see them now.

  8. Wayve's Avatar
    Wayve commented in tuition class


    2009
    Nov
    15
    Sun
    12:39am
     
    8

    hi, can you post de answers for Science Physics and Chemistry Paper 2 and 3 - 2009 O level?
    Thanks!

  9. JS's Avatar
    JS commented in tuition class


    2009
    Nov
    17
    Tue
    7:57am
     
    9

    Miss Loi, i have a ques regarding Q9.
    I thought the questtion says ''until it became a gas'', then how come at the begining it is a gas and not the ending ? cos' you said the gas first changes into a liquid. If the ending is a gas, then why is the answer not C? thanks! (:

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


    2009
    Nov
    17
    Tue
    4:54pm
     
    10

    JS: Errr ... if you read the question again it says

    A substance was heated in an enclosed space until it became a gas.

    After the heater was removed, the temperature of the substance was recorded at regular intervals ...

    So the scenario was to heat it first to its gaseous state, before being allowed to cool naturally i.e. gas -> condenses into liquid -> liquid -> solidifies into solid -> solid. The graph in the question only captures the cooling process, hence the dropping temperature as time increased.

  11. lau soon yang's Avatar
    lau soon yang commented in tuition class


    2009
    Nov
    20
    Fri
    9:26am
     
    11

    hey miss loi,
    question 35 is the iron fillings in a testube with various gases including carbon dioxide and oxygen.
    the question stated,''until no further changes in volume.''
    I was taught that carbon dioxide will dissolve in water to form carbonic acid.
    So shouldn't we deduct the carbon dioxide' volume?

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


    2009
    Nov
    25
    Wed
    1:05am
     
    12

    Hello soon yang from Shenzhen, where I've just joined my sister (who has been shopping like a mad woman at Dongmen).

    For combined science chemistry qn35, the likely purpose of this question is to test our knowledge of what gas is needed for rusting to occur.

    While carbon dioxide is indeed soluble in water, do note that this reaction interconverts (i.e. reversible reaction) between CO2 and H2CO3 spontaneously.
    CO2 + H2O ⇌ H2CO3

    And since we could not determine how much CO2 has dissolved at any one time, we wouldn't take CO2 into consideration.

    P.S. even if we were to consider the scenario where ≤ 20 cm3 of CO2 is dissolved, there isn't any suitable option (≥ 50 cm3, < 70 cm3) that has been presented to us by the question.

  13. RJ's Avatar
    RJ commented in tuition class


    2009
    Dec
    1
    Tue
    3:54am
     
    13

    hi miss loi , do you have solutions for 2009 'O' level Principle of accounts p1 & p2 ?

  14. tan zan hao's Avatar
    tan zan hao commented in tuition class


    2009
    Dec
    23
    Wed
    11:31pm

2 Reactions

  1. Tweetback
    Miss Loi tweeted


    2009
    Nov
    13
    Fri
    4:25am
     
    15

    If you're still in the mood, the solutions to all the Combined Science Paper 1 MCQs (Physics/Chem/Bio) are out: http://bit.ly/1aPWNc

  2. Tweetback
    Mirawr tweeted


    2009
    Nov
    14
    Sat
    10:56am

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