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  1. D

    Biology; Chemistry; Physics: Post your doubts here!

    Suppose you're measuring a potential difference of 4V. You start with a voltmeter that can read up to 20v. The needle only moves a little since the magnitude is small compared to the range of the voltmeter. Then you use a 5V voltmeter to measure the same pd, so that the needle almost fully...
  2. D

    Biology; Chemistry; Physics: Post your doubts here!

    Can somebody explain how to use set squares to avoid parallax error when taking measurements from a ruler?
  3. D

    Biology; Chemistry; Physics: Post your doubts here!

    The main scale gives readings in cm. It has a precision of .1 cm or 1 mm. The number of markings on the vernier after which 2 points coincide are added as 0.1 mm. For example the main scale may read 3.1cm and the points of the vernier and main scale coincide after 4 markings so the answer is 31...
  4. D

    Biology; Chemistry; Physics: Post your doubts here!

    A jockey is used to connect a resistance wire to a circuit. Look at question 4 of w02_qp4.
  5. D

    Biology; Chemistry; Physics: Post your doubts here!

    A better answer would be to tell how you would take the reading from the center. E.g mark the position of the center on the lens holder.
  6. D

    Biology; Chemistry; Physics: Post your doubts here!

    For higher sensitivity the bore should be narrow and the liquid should expand easily/more when heated. For a more responsive thermometer, the glass should be as thin as possible and the liquid must be a good conductor of heat.
  7. D

    Maths, Addmaths and Statistics: Post your doubts here!

    Time questions usually just require counting and some conversion.
  8. D

    Maths, Addmaths and Statistics: Post your doubts here!

    Just use your calculator... cube root of 1/3375000. You get 1/150.
  9. D

    Maths, Addmaths and Statistics: Post your doubts here!

    Think of it like this, the 4 gets cancelled with 2. It's gone then, you can't divide pi and r by 2 after that.
  10. D

    Maths, Addmaths and Statistics: Post your doubts here!

    My bad, you have to take cube root of the answer (similar figures). And you can only cancel if it is 2t * 5/t* 1.
  11. D

    Maths, Addmaths and Statistics: Post your doubts here!

    1) 1200/(4050 * 100 * 100 * 100) 2) You can't because they're being subtracted. 3) 243 pi = 2*pi*r^2 + pi*r^2 243 pi = r^2(2pi + pi) 243 pi/ 3 pi = r^2 81 = r^2 9 = r
  12. D

    Biology; Chemistry; Physics: Post your doubts here!

    Yeah, they're from the CIE Physics revision check list.
  13. D

    Biology; Chemistry; Physics: Post your doubts here!

    describe the use of magnetic materials in audio/video tapes describe a simple experiment to show the refraction of sound waves
  14. D

    Biology; Chemistry; Physics: Post your doubts here!

    Try the first question of w04_qp4
  15. D

    Biology; Chemistry; Physics: Post your doubts here!

    Yeah, my teacher told us to reverse the direction of current in case of electron flow and use LHR.
  16. D

    Biology; Chemistry; Physics: Post your doubts here!

    I did all the MCQs of Electromagnetic Induction from redspot topical (2001-11) and haven't come across Fleming's right hand rule. Also, there are only 2 paths for light rays that we have to learn for diverging lenses, right?
  17. D

    Maths, Addmaths and Statistics: Post your doubts here!

    Need help with part b.
  18. D

    Biology; Chemistry; Physics: Post your doubts here!

    Can someone explain this?
  19. D

    Biology; Chemistry; Physics: Post your doubts here!

    You're right. The examiner report says "...Many candidates did realise that the mass would rise as far above its original position as it was pulled down below its original position"
  20. D

    Biology; Chemistry; Physics: Post your doubts here!

    If you think about it, the coil cannot go past the vertical position because both of its ends are fixed to the circuit. The split rings allow it to go past the vertical position, because they can 'disconnect' themselves from the circuit for a brief moment and make the 180 degree turn.
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