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Of The GCE O Level 2013 Combined Science (Physics/Chemistry) 5116 MCQ Paper 1 Suggested Answers & Solutions

Tuition given in the topic of Science Tutors from the desk of Miss Loi at 2:53 pm (Singapore time)

Updated on

… continued from here.


11 Nov 2013

Keep Calm And Shade Well

Exhausted from helping to prepare four intensive days of Science MCQ workshops, I slumped against my chair at The Temple.

Jφss Sticks OMR

Was running out of these

After running around to ensure every student in these small, cosy classes gets the necessary attention, material, and of course the food that everyone’s raving about, I’m quietly confident that they’ve all been 传受-ed the necessary 功力, foundational & conceptual knowledge for the last, last leg of their epic O Level journey.

Speaking of which, the first of this week’s shading aka tikam-tikam exercise should have ended just this morning …

The list of workings and explanations for each of the answers (where applicable) have been compiled!

Latest version: 1.1: Q28 – corrected typo in mole calculation. Mole ratio of HCl to H₂ should be 2 : 1 (instead of 1 : 1) *bleah*

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

GCE O Level 2013 Combined Science 5116 Paper 1 solutions

2013 O-Level October/November Combined Science (Physics, Chemistry) 5116 Paper 1 Suggested Solutions
Access it here if you’re having trouble accessing it on Facebook using your state-of-the-art smartphone :(

Do they tally with yours? As usual, please, please leave a comment should you spot any mistake in the solution.

Note: If you are taking Physics/Biology or Chemistry/Biology, the set of Physics/Chemistry MCQs in the relevant section of your paper should be exactly the same.


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Comments & Reactions


  1. Jasmine's Avatar
    Jasmine commented in tuition class


    Do you have it for science biology section?

  2. Navin's Avatar
    Navin commented in tuition class


    Hi Ms Loi, really appreciate your effort in doing up the suggested answers for the relevant subjects. Just wanted to enquire about Qn 12(Phy). Why can't the answer be B? I mean first when the light ray enters the glass block, it refracts towards the normal. Then it goes back out into air so it refracts away from the normal. How can we assume that the angle of incident in the glass block is greater than the Critical angle? Once again thanks for the answers. Cheers 🙂

    • 2013

      @Navin: The Temple's Physicist says ...

      "It's given in Q12 that the critical angle (c) for light in glass is 42°.

      Since it's a rectangular glass block, the first and second boundaries are perpendicular to each other so by the sum of angles in the right-angled triangle (see diagram below), the angle of incidence (i) at the second boundary is 50°


      Since i > c, total internal reflection occurs at the second boundary.

      P.S. Even if we suppose total internal reflection doesn't take place at the second boundary, your "suggested" answer should have been A (instead of B) since, as you mentioned, the exiting ray of light should refract away from the normal (similar to light rays through a prism)."

  3. Annon's Avatar
    Annon commented in tuition class


    when is the suggested answer for pure physics paper 1 gonna be released ?

  4. jodan chin wei liang's Avatar
    jodan chin wei liang commented in tuition class


    Mrs loi for q 6 how can u assume that the water is ablr to reach up to 400 m

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