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Physics
A small ball starts moving from A over a fixed track as shown in the figure. Surface AB has friction. From A to B the ball rolls without slipping. Surface BC is frictionless. K_A, K_B and K_C are kinetic energies of the ball at A, B and C, respectively. Then (a) h_A > h_C ; K_B > K_C (b) h_A > h_C ; K_C > K_A (c) h_A = h_C ; K_B = K_C (d) h_A < h_C ; K_B > K_C
Chemistry
During the discharge of a lead storage battery, the density of sulphuric acid fell from 1.294 to 1.139 g/ml. Sulphuric acid of density 1.294 g/ml is 39% by weight and that of 1.139 g/ml is 20% H₂SO₄ by weight. The battery holds 3.5 liters of the acid and the volume remained practically constant during the discharge. Calculate the number of ampere-hours for which the battery must have been used. The charging and discharging reactions are: Pb + SO₄^2- = PbSO₄ +2e^– (Charging) PbO₂ + 4H⁺ + SO₄^2- + 2e^- = PbSO₄ + 2H₂O (Discharging)
Mathematics
If x>1, y>1, z>1 are in G.P. Then are in (a) A.P (b) H.P (c) G.P (d) None of these

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