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10 Practice Sets for NDA 40 62. A tank $5\mathrm{m}$ high is half filled with water and then it is 71. Tachometer is a device used to measu filled to the top with oil of density $0.85\mathrm{g}/{\mathrm{cm}}^3$. The (a) viscocity (c) gravitational pull pressure at the bottom of the tank, due to these 72. To produce an erect image larger tha liquids is (a) $462.5\mathrm{g}/{\mathrm{cm}}^2$ (b) $1.85\mathrm{g}/{\mathrm{cm}}^2$ should be use a (b) convex (a) convexlens (c) $89.25\mathrm{g}/{\mathrm{cm}}^2$ (d) $46.25\mathrm{g}/{\mathrm{cm}}^2$ (c) concave lens 63. Two ends of rods of length $L$ and radius $r$ of the same material are kept at the same temperature. Which of the following rods conducts most heat? (a) $L=25\mathrm{cm},r=0.5\mathrm{cm}$ (b) $L=50\mathrm{cm},r=1\mathrm{cm}$ (b) $\frac{1}{2}mgR$ (c) $\mathrm{mgR}$ (c) $L=75\mathrm{cm},r=1.5\mathrm{cm}$ (d) $L=100\mathrm{cm},r=2\mathrm{cm}$ (a) $2\mathrm{mgR}$ 64. The temperature of a gas in a rigid container is 74. If the kinetic energy of a body raised, the pressure exerted by the gas on the walls of its momentum will be increase (a) $100\%$ (c) $300\%$

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Updated on: Apr 11, 2023