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  1. 6

    AS Physics P1 MCQs Preparation Thread.

    #32 Power = I^2 R so power in Y = (I/2)^2 x 2R = I^2/2R power in X = I^2 R Y/X = 1/2 so answer is B
  2. 6

    P1 MCQ's preparation thread for chemistry ONLY!!!!

    first you find the mol ratio of the metal ion and sulphite ion which is 2:1 because same concentration and 50:25 volume so you know 2 metallic ions are required to oxidise 1 sulphite ion. then you find the change in oxidation number of sulphite ion to sulphate +4->+6 which is +2 so 2 metallic...
  3. 6

    AS Physics P1 MCQs Preparation Thread.

    use the equation nλ=dSinθ where n(number of order), λ(wave lengeth), d(distance between each grating) and θ being the angle. since he's looking at the maximum number of images so Sinθ= 1. and nλ=d. to find d, you divide 1mm/500 so you get 2x10^-6/ n=d/λ=2x10^-6/(600x10^-9)= 3.33 on each side of...
  4. 6

    Physics: Post your doubts here!

    wierd, I just did calculation again and it is B. You can always use the last resort by counting the squares. I counted 243 squares and each area of square is 5x10^-4 so I get 0.1215 J which is B
  5. 6

    AS Physics P1 MCQs Preparation Thread.

    okay this question is really simple if you read the words. Frictionless ground and rough wall. since ground is frictionless so R will be vertically upwards because there is no horizontal component, it is only reaction to balance the weight that eliminates C/D leaving AB. then its a rough wall...
  6. 6

    Physics: Post your doubts here!

    #13 F(net force) = ma F(net) = 2x9.81(the weight) - 6(friction) = 13.62 total mass = 8+2 = 10 F=ma A=F/M = 13.62/10 = 1.4 so answer is A #18 efficiency = output power/input power in this case its a generator so output power is P=VI = 230 x 32=7360 input power = E(potential) / time = Mgh/t =...
  7. 6

    AS Physics P1 MCQs Preparation Thread.

    relative speed of approach = relative speed of seperation, lots of students get confused by this question because there is no solid formula note its speed not velocity. speed of approach for this question you add U1 and U2 because they're coming towards each other. seperation because they're...
  8. 6

    Physics: Post your doubts here!

    #9: V^2=U^2 + 2 as so original equation 0 = U^2 + 2ax increase in initial velocity by 20% so 0 = (1.2U)^2 + 2ax = 1.44U^2 + 2ax X is proportional to U so answer is C, 1.44x #18 solved by Gain in potential energy of m1 minus loss in potential energy in m2. the change in energy is the work done...
  9. 6

    Chemistry: Post your doubts here!

    Yeah Im AS, alright ill post there
  10. 6

    Chemistry: Post your doubts here!

    Thanks.. I didnt think it would get oxidised as well. ( the original OH group) so basically organic product for CH2=CHCH2OH + hot KMnO4 = no organic product? since first it becomes HCOOH + HOOCCOOH. HOOCCOOH gets oxidised to HCOOH as well. and HCOOH all get oxised to CO2 + H2O
  11. 6

    Chemistry : P1 and P2 doubts only (Only AS allowed)

    1. CH2=CHCH2OH + KMNO4 dilute cold = HOCH2CH(OH)CH2OH? or does the original OH group get oxidised 2. HOOCCOOH + Kmno4 hot = CH3COOH? 3. HCOOH + Kmno4 hot = co2 and h2o so no organic products?
  12. 6

    Chemistry: Post your doubts here!

    1. CH2=CHCH2OH + KMNO4 dilute cold = HOCH2CH(OH)CH2OH? or does the original OH group get oxidised 2. HOOCCOOH + Kmno4 hot = CH3COOH? 3. HCOOH + Kmno4 hot = co2 and h2o so no organic products?
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