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2008
Wed
12
Nov
Little Miss Loi avatar

GCE O-Level 2008 Oct/Nov Physics & Chemistry Paper 1 Suggested Answers & Solutions

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Tuition given in the topic of Little Miss Loi the Science Tutor (archived) from the desk of Little Miss Loi at 5:31 pm (Singapore time)

UPDATE: My list of suggested answers for the Combined Science (Physics, Chemistry) 5116 Paper 1 is now up (see below) 😀

Those of you taking other combinations (i.e. 5117 or 5118) in this ‘O’ Level would’ve probably gone through the same set of 20 Physics or 20 Chemistry MCQs on Tuesday.

Hi it’s me again!

Now that (most of) you have been liberated, I’ve drafted a list of my suggested answers for todays Chemistry Paper 1 and Monday’s Physics Paper 1, along with the relevant workings and explanations for each answer (where applicable).

O-Level 2008 October/November Physics 5057/5058 Paper 1 Suggested Solutions O-Level 2008 October/November Chemistry 5072/5067 Paper 1 Suggested Solutions

2008 O-Level October/November Science Paper 1 Suggested Solutions
Physics 5057/5058 (left) & Chemistry 5072/5067 (right) – click to download
O-Level 2008 October/November Combined Science 5116 Paper 1 Suggested Solutions

2008 O-Level October/November Combined Science (Physics, Chemistry) 5116 Paper 1 Suggested Solutions – click to download

So did your tikam-tikam MCQ answers tally with mine? Do leave a comment if you spot any mistake but please be gentle with me ok, even though I can be quite ductile and malleable 😛 Haha.

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45 Comments

  1. Passer-by's Avatar
    Passer-by commented in tuition class


    2008
    Nov
    12
    Wed
    6:16pm
     
    1

    Hello,

    how much do you think the A1 scores for Phy and Chem will be this year?

    Based on your marking schemes, I got only 36 for Phy and 39 for Chem.

    For question 11, I think that you should add a note that liquid and solid's volume should be negligible as they take up much less space compared to a gas. Thanks =)

  2. Another passer-by's Avatar
    Another passer-by commented in tuition class


    2008
    Nov
    12
    Wed
    6:26pm
     
    2

    Physics Qn15: Temperature increases, force exerted per particle increases, so shouldn't the frequency decrease such that the TOTAL force acting on the piston remains the same? (because the area of piston remains the same and you have to maintain a constant pressure).

    In other words, could you rethink Option B?

  3. c's Avatar
    c commented in tuition class


    2008
    Nov
    12
    Wed
    7:46pm
     
    3

    Hey there (:

    Able to do the answer scheme for the MCQ papers 5118/5116?

    Thanks
    XOXO

  4. Clare's Avatar
    Clare commented in tuition class


    2008
    Nov
    12
    Wed
    9:22pm
     
    4

    Ms Loi, you're super lame as always! If I really do somehow by some miracle, get an A for Physics, I'll treat you to like twenty bowls of corn soup. HAHA. 🙂

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


    2008
    Nov
    12
    Wed
    9:54pm
     
    5

    Hello Passer-by 🙂

    As all reactants in qn 11 are in gaseous state, this should be a clear sign that the volume change concerns only the volume of the gases.

    But you're right too that the volumes of liquids & solids are negligible to the volumes of gases e.g. 1 mole of steam = 24000 cm³ vs 1 mole of water = 18 cm³

  6. Anoneemers's Avatar
    Anoneemers commented in tuition class


    2008
    Nov
    12
    Wed
    10:28pm
     
    6

    I got 38 for both physics and chemistry

    Physics question 15 i wrote A for 2 reasons
    1) For rate of collision, I saw 2 "greater" so i chose greater =.=
    2) I thought the heated gas collide more with piston to move it out...

    Anyway is 38 a safe mark to get A1?

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


    2008
    Nov
    12
    Wed
    10:31pm
     
    7

    Hi Anoneemers and Another passer-by! This sounds like a traffic junction 😛

    As Another passer-by mentioned, the pressure is due to the force exerted by the particles on the piston, which is in turn determined by rate of collision (i.e. force acting on a unit area per unit time).

    But in order for the pressure to remain unchanged, the rate of collision must be the same.

    FYI, this unchanged rate of collision (despite the faster molecules) is actually due to the greater average inter-molecular distance/distance to the piston caused by the increase in volume.

    So you can think of this as effectively 'cancelling' out the ↑ rate of collision due to ↑ speed of molecules, resulting in no change to the rate of collision.

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


    2008
    Nov
    12
    Wed
    10:34pm
     
    8

    c: Look again!!!

    Clare: TWENTY BOWLS ONLY????!!!!!!!!!! My elder sister says she also want!!!

  9. Clare's Avatar
    Clare commented in tuition class


    2008
    Nov
    12
    Wed
    10:40pm
     
    9

    ONLY?!?!!?!?!?!!? WHAT. I THINK YOU'LL BE QUITE FAT BY THEN! HAHAHA!

  10. shelyce's Avatar
    shelyce commented in tuition class


    2008
    Nov
    12
    Wed
    10:48pm
     
    10

    For the Chem mcq question no. 3, it ask which gases change the colour of damp red litmus paper. But chlorine change the colour of damp blue litmus paper. So the answer cannot be A.

  11. Traffic Light's Avatar
    Traffic Light commented in tuition class


    2008
    Nov
    12
    Wed
    11:14pm
     
    11

    Any idea how the moderation would be like? Like how many marks to get A1? Cause I'm in a super risky position, got 75% but likely no 85%.. feeling very not at ease now. Since you all are teachers, can share the % required for A1 in previous years if moe got release?

  12. Traffic Light's Avatar
    Traffic Light commented in tuition class


    2008
    Nov
    12
    Wed
    11:18pm
     
    12

    For pure physics question 9, can explain why it is A? Cause I learnt that lower CG means more stable because the chances of line of action of weight lying within the base is higher, so why must raise over the rope? I put D btw, cause all the other answers look wrong to me.

  13. Gabbs's Avatar
    Gabbs commented in tuition class


    2008
    Nov
    12
    Wed
    11:30pm
     
    13

    Hi, 5116/01 paper , Qn 17, I also write B which is the largest resistance one(your ans too^^). But dunno why my tcher gave his ans as C(lowest resistance).

  14. angelyn's Avatar
    angelyn commented in tuition class


    2008
    Nov
    12
    Wed
    11:31pm
     
    14

    hi,
    why is qn 38 of phy/chem 5116 B?
    isn't alkanes saturated? so shdn't it be A?

  15. Traffic police's Avatar
    Traffic police commented in tuition class


    2008
    Nov
    13
    Thu
    12:43pm
     
    15

    Physics Q37...Can I say that the point Y is outside the magnet and thus Y is weaker than X and Z?

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


    2008
    Nov
    13
    Thu
    7:04pm
     
    16

    Good day everyone!

    shelyce: Since hydrogen chloride is acidic, and carbon dioxide and sulphur dioxide are acidic oxides that dissolve in water to form acids, options B, C and D are eliminated because acids turn blue litmus red.

    As for chlorine, as I have mentioned in my suggested solution, it actually bleaches the litmus paper since it's a bleaching agent, but not before it turns the blue litmus red briefly (due to the formation of HCI).


    Traffic Light(???): Actually I can't say that Option D is wrong per se but it doesn't really explain why a pole is carried.

    In our case, the rope is the pivot and the man (consider him as a point mass with a narrow base) will easily lose his balance when his CG does not lie in line with the rope.

    When this happens, he can shift the (long, long) pole accordingly to create a restoring (large) moment on his body to bring his CG back in line with the rope, thereby making it easier for him to keep his balance (i.e. CG) over the rope so that he doesn't faaaaaaaaaaaaaaalllll .....


    Gabb: Hey now that you mentioned, I took a look at the question again and found that it asked "In which circuit will the CELL lose its energy the fastest?"

    I'm now inclined to believe that the answer is C due to the fact that the parallel circuit draws more current from the cell and thereby making it lose energy faster.

    I'll have a check first with other people before confirming the change to my answer.


    angelyn: In a hydrogenation process, saturated margarine is converted from unsaturated liquid vegetable oil via an addition reaction (which is the characterized reaction of the alkene family because it is unsaturated (i.e. contains C=C bond)

    Alkane family, on the other hand, undergoes substitution reaction because it is saturated (i.e. contains C-C bond)


    Traffic Police Sir! But point Y lies inside the solenoid (check your diagram again)!

    ... and I kept to the speed limit on my way back just now!

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


    2008
    Nov
    13
    Thu
    7:06pm
     
    17

    And Clare! I think I can still afford to! Tsk tsk.

  18. Traffic Light's Avatar
    Traffic Light commented in tuition class


    2008
    Nov
    14
    Fri
    1:49am
     
    18

    Can see where you are coming from, but his CG will definitely be above the rope even if he does not hold the pole isit? Cause he is not some ring shaped object and no part of his body is below the rope, at least before he falls.

  19. kelvin's Avatar
    kelvin commented in tuition class


    2008
    Nov
    14
    Fri
    10:09am
     
    19

    hey will you be posting the pure biology results?

  20. chanhankiang's Avatar
    chanhankiang commented in tuition class


    2008
    Nov
    14
    Fri
    1:47pm
     
    20

    hi. i search the whole search engine and realise you are the only person who put the answers up till this moment. cheers. will u put up the biology paper 1 answers? i am interested to check out your explanation provided rather than the answers because it really o help. thanks

  21. Miss Loi's Avatar
    Miss Loi Friend Miss Loi on Facebook @MissLoi commented in tuition class


    2008
    Nov
    14
    Fri
    6:07pm
  22. Little Miss Loi's Avatar
    Little Miss Loi commented in tuition class


    2008
    Nov
    14
    Fri
    8:04pm
  23. Traffic police's Avatar
    Traffic police commented in tuition class


    2008
    Nov
    14
    Fri
    10:50pm
     
    23

    I think Physics question 9 is not D because there is no such thing as spreading out his weight... As in every part of his body has a weight and his weight cannot be transferred to the rod. Isn't that right?
    Combined physics question 17 is C because P=VI, V is fixed for a cell so higher I means greater energy loss right?

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


    2008
    Nov
    15
    Sat
    2:01am
     
    24

    OK Gabbs & Traffic Police Sir, I've amended the answer to Qn 17 in the Combined Science 5116 Paper 1 to C (the // circuit), since the lowest resistance will draw the greatest current from the cell, thereby causing the cell to lose its energy the fastest.

    I think countless students have fallen through the trapdoor for this one. Sigh.

    Traffic Light: Perhaps some stickman diagram would help in the understanding of Pure Physics Qn 9:

    Tightrope Walking

    In 1) the man is balanced on the rope, with his CG directly over the rope as you've mentioned.

    But with such a narrow base, unless he is 黃飛鴻, a slight wind or a slight muscle cramp that causes a slight shift of his CG either side of the line of pivot will create a moment about the pivot that will cause him to fall (see 2) ) very quickly, even though his CG is still above the rope for a brief moment when he begins to fall.

    With a long pole that commonly comes with weighted ends, he can save himself from falling by shifting his pole to create a huge restoring moment (the weighted end of the pole x the long perpendicular distance) on the opposite end (see 3) ). He can also achieve this somewhat by stretching out his short puny arm but its effect will be limited.

    In reality, the pole also helps in increasing the man's moment of inertia, making him more 'resistant' to falling via distributing his weight away from his ankles to both ends of the pole (which is basically what Option D says, but as explained above this isn't the only thing it does - the ultimate aim is still to maintain his CG directly over the rope).

  25. Amanda's Avatar
    Amanda commented in tuition class


    2008
    Nov
    15
    Sat
    2:13am
     
    25

    Don't have answers for 5154/01? Discrimination of old syllabus! heh 😛

  26. Traffic Light's Avatar
    Traffic Light commented in tuition class


    2008
    Nov
    15
    Sat
    12:01pm
     
    26

    I understand already =D Thank you! 谢谢! The drawing must have took you some time.

  27. BTA's Avatar
    BTA commented in tuition class


    2008
    Nov
    15
    Sat
    8:56pm
     
    27

    Thanks a lot for the answers! They were a great help!
    I scored 17/20 for Physics and 17/20 for Chemistry. I think I'm a little risky!

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


    2008
    Nov
    16
    Sun
    1:43pm
     
    28

    Amanda: Do you still have the 5154 question paper? By the way, you know my sister? She's standing behind me exclaiming "Amanda! Dun come in and 捣蛋 lah!"

    Traffic Light: Those diagrams? I asked someone to draw for me *giggles*

    BTA: 17/20+17/20 = 34/40 (85%) = risky?! Something happened in your Paper 2/3?

  29. Amanda's Avatar
    Amanda commented in tuition class


    2008
    Nov
    16
    Sun
    2:49pm
     
    29

    *giggles* hello Miss Loi! 😛

    I still have it... Mine's Chem/bio. How to send to you? lol

  30. Kenneth's Avatar
    Kenneth commented in tuition class


    2008
    Nov
    16
    Sun
    5:40pm
     
    30

    Hi, sorry to post it here, but could i get the answers for A Maths 4037/1 ? Thanks loads

  31. BTA's Avatar
    BTA commented in tuition class


    2008
    Nov
    16
    Sun
    11:02pm
     
    31

    Hey I thought it would be safer to get at least 85% to secure an A1 and my MCQ is only borderline so I thought I was a little risky. Nothing much happened in my Paper 2/3 but if something did happen that I did not come to realise sooner, my MCQ will not be able to pull it up. Furthermore, I was expecting full marks or at least 90% for MCQ so I thought I was risky!

  32. chanhankiang's Avatar
    chanhankiang commented in tuition class


    2008
    Nov
    18
    Tue
    10:43am
     
    32

    yes you are risky. this year is a strong batch. wads ur sch

  33. BTA's Avatar
    BTA commented in tuition class


    2008
    Nov
    20
    Thu
    2:37am
     
    33

    Hey Chanhankiang, I'm in Crescent Girls' School. 😀

  34. Miss Loi's Avatar
    Miss Loi Friend Miss Loi on Facebook @MissLoi commented in tuition class


    2008
    Nov
    20
    Thu
    9:46pm
     
    34

    Sorry to interrupt your little banter ...

    Amanda + Kenneth, did you receive Miss Loi's email? Do send your question papers asap to Jφss Sticks' Marking Services ok?

    Alright chanhankiang, your turn to introduce your school now 🙂

  35. Kenneth's Avatar
    Kenneth commented in tuition class


    2008
    Nov
    22
    Sat
    11:37am
     
    35

    oh yeah hi. I did recieve it.
    But it was a misunderstanding.
    I just realised that wasn't my paper.
    I'm sorry.

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


    2008
    Dec
    4
    Thu
    2:46pm
     
    36

    Amanda: Thanks for your question paper! After being nagged to the brink of death by my sis, I've finally managed to put up my set of 5154/01 solutions 😛

    The chemistry questions are exactly the same as those in 5116/01! Lazy buggers ...

  37. TheNoob's Avatar
    TheNoob commented in tuition class


    2009
    Jan
    2
    Fri
    9:04am
     
    37

    I scored 36/40 for bio paper 1, and 31/40 for chem paper? Do you think i can still secure A1 for both papers? Im quite confident for paper 2 ><

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


    2009
    Jan
    3
    Sat
    12:25am
  39. complicated's Avatar
    complicated commented in tuition class


    2009
    Nov
    10
    Tue
    9:55pm
     
    39

    do you have the answers for physics paper 2009 5058/01?

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


    2009
    Nov
    11
    Wed
    12:48pm
     
    40

    Hi complicated, without further ado I've managed to work out the not-so-complicated answers to the 2009 Physics P1 MCQ 😉

  41. complicated's Avatar
    complicated commented in tuition class


    2009
    Nov
    11
    Wed
    4:31pm
     
    41

    haha thanks, i got 39...last min i change the correct ans to wrong...

  42. complicated's Avatar
    complicated commented in tuition class


    2009
    Nov
    13
    Fri
    12:26pm
     
    42

    hi, sorry to bother you again...can you also put up the answers for 2009 biology(5094/01) and chemistry(5072/01) thanks so much

  43. carpaccio's Avatar
    carpaccio commented in tuition class


    2009
    Nov
    14
    Sat
    11:07pm
     
    43

    whoops sorry it is the chemistry answers for
    pure chemistry paper 1 5072/01. my mistake for posting in this section.

  44. dhyna's Avatar
    dhyna commented in tuition class


    2010
    Oct
    1
    Fri
    12:01am
     
    44

    thanks miss loi......these answers will help me a lot in preparing for my o level.

  45. sarah rizwan's Avatar
    sarah rizwan commented in tuition class


    2011
    Apr
    1
    Fri
    8:15pm

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    Pinged by Chemistry Hub


    2009
    May
    22
    Fri
    12:48pm
     
    46

    Chemistry Hub...

    [...] Amanda: Thanks for your question paper! After being nagged to the brink of death by my sis, I've finally managed to put up my set of 5154/01 solutions :P. The chemistry questions are exactly the same as those in 5116/01! Lazy buggers ... [......

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