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  1. Saad Mughal

    Biology; Chemistry; Physics: Post your doubts here!

    Carbonate - all insoluble except Group 1 and Ammonium salts. Hydroxides - all insoluble except Group 1, Group 2 (Ca, Ba) and Ammonium salts. Nitrates - all soluble. Sulphates - all soluble except BaSO4, PbSO4, CaSO4. Halides (Cl,Br,I) - all soluble except Lead Halide, Silver Halide.
  2. Saad Mughal

    Biology; Chemistry; Physics: Post your doubts here!

    Yeah, usama321 is correct, the output is directly proportional to the changing property of the thermometric substance (just like a straight line graph).
  3. Saad Mughal

    Biology; Chemistry; Physics: Post your doubts here!

    Common sense. :p
  4. Saad Mughal

    Biology; Chemistry; Physics: Post your doubts here!

    Precautions: - Parallax error should be avoided. Eye placement should be correct when taking readings. - All solutions (acids and alkalis) should be pure, impurities (such as indicators) should not be present (when preparing salts). - The burrette should be clean and pure to avoid concentration...
  5. Saad Mughal

    Biology; Chemistry; Physics: Post your doubts here!

    See attached picture. The weights are moved along the scale and it seen that the plank is only in equilibrium when the clockwise and anticlockwise moments are balanced. This experiment verifies the principle of moments.
  6. Saad Mughal

    Biology; Chemistry; Physics: Post your doubts here!

    Braking force is applied to the braking pads of the car, they make the wheels stop rotating but because of inertia, the car doesn't stop instantly, the frictional forces acting on the car help it to stop (acting opposite to the direction of motion).
  7. Saad Mughal

    Biology; Chemistry; Physics: Post your doubts here!

    Braking distance is the distance traveled by the car when the brakes are applied. In context, the greater the braking FORCE applied the more quickly the car will stop. It is related to friction in the manner that the larger the braking force, the higher the frictional resistive force (which...
  8. Saad Mughal

    Biology; Chemistry; Physics: Post your doubts here!

    There is no use of it (in terms) for Physics/Chemistry, but you should know that nano is smaller than milli, micro units.
  9. Saad Mughal

    Biology; Chemistry; Physics: Post your doubts here!

    It's 1000 kg/m^3.
  10. Saad Mughal

    Biology; Chemistry; Physics: Post your doubts here!

    There are several units for everything, for example: mass has units, pounds, grams, ounces. But we use standard international units called SI units. This is what is meant by this part. You should know that, length (m), mass (kg), speed (m/s) and so on... You should also know that deci is 10^-1...
  11. Saad Mughal

    Maths, Addmaths and Statistics: Post your doubts here!

    The marking scheme is correct, The probability that all three numbers are the same is that it could be 1-1-1, 3-3-3, 5-5-5, 7-7-7, 9-9-9. Hence, Probability = 5 * (1/5*1/5*1/5) = 1/25.
  12. Saad Mughal

    Biology; Chemistry; Physics: Post your doubts here!

    1 mark for the symbols. 1 mark for ammeter in series. But, no W is labelled, -0.5 mark. Voltmeter is connected in series, it should be connected across the wire. 1.5/3 is what you would get.
  13. Saad Mughal

    Maths, Addmaths and Statistics: Post your doubts here!

    Split the inequalities, 13<7-2x 6<-2x 2x<-6 x<-3 AND, 7-2x<18 -2x<-11 x>-5.5 Now, Write the inequality again, -5.5<x<-3. a= -5.5 b= -3 Hope that helps.
  14. Saad Mughal

    Biology; Chemistry; Physics: Post your doubts here!

    Ok :)
  15. Saad Mughal

    Biology; Chemistry; Physics: Post your doubts here!

    Is it even relevant to the syllabus? :eek:
  16. Saad Mughal

    Biology; Chemistry; Physics: Post your doubts here!

    The magnetism in the coil fades away, this means that the opposed induced current will oppose the magnetic field (in this case attract it), this will cause a slight jitter to the left as before.
  17. Saad Mughal

    Biology; Chemistry; Physics: Post your doubts here!

    It passes from the top to the circuit and then back from the bottom (I guess :confused:).
  18. Saad Mughal

    Biology; Chemistry; Physics: Post your doubts here!

    usama321 is correct. Alpha does have more charge but the deflection of beta particles is more because beta have almost zero mass when compared to alpha (which is quite heavy when compared to the beta particles).
  19. Saad Mughal

    Biology; Chemistry; Physics: Post your doubts here!

    Lenz's law states that the direction of the induced current acts opposite to the magnetic field that induces it. When the electromagnet is magnetized, the deflection is towards the right (then zero), hence when the switch is open (electromagnet demagnetized), the deflection is towards the left...
  20. Saad Mughal

    Biology; Chemistry; Physics: Post your doubts here!

    Yeah that's a mistake.
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