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1. Four Forces act on a point object. The object will be, in equilibrium, if, (1) they are opposite to each other in pairs, (2) sum of x, y and z-componcats of forces is zero, , separately, , (3) they cab be represented by a closed figure of, Asides by direction and magnitude, , (4) All of the above, , 2. Ablock of mass 10 kg is suspended by three strings, as shown in the figure. The tension T, is, , , , (1) 100N Q) ae, (3) Gx 100N (4) 50 N, , 4. The pulleys and strings shown in the figure are, smooth and of negligible mass. For the system to, remain in equilibrium, the angle @ should be, , ae (2)30° GB4r (4) 0, , 5. Anon-uniform rod AB of weight w is supported, horizontally in a vertical plane by two light strings, P4 and OB as shown in the figure. G is the centre of, gravity of the rod. If Pt and OB mark angles 30°, and 600 respectively with vertical, the ratio AG/BG, is, , , , , , , , (1) 130.9 kgf, (3) S0kef, , (2) 60 kef, (4) 103.9 kef, , , , 6, Aman of mass 50g stands on a frame of, mass 30 g. He pulls on a light rope, which passes over a pulley. The other, end of the rope is attached to the frame., For the system to be in equilibrium., what force man must exert on the rope?, (1) 402 (2) 80g, (3) 30g (450g, , 7. A ball of mass | kg hangs in equilibrium from two, strings OA and OB as shown in figure. What are the, ee g=10 ms"), , , , (1) SN, SN, (2) 5V3N,5v3N, (3) 5NSv3N, (4) 5V3N,5N, , 8. Three blocks of masses m,, m, and m, are, connected by massless strings as shown on a, frictionless table, They are pulled with a force 7, =, 40N. If m,= LOkg, m, = 6 kg and m, = 4kg, the, tension T, will be, , , , , , , , , , , , , , , , , , T, T; Tt, m™ Lm, (1) 20N (2)40N GION (4)32N, , 9. In the arrangement shown, the, mass m will ascend with an, acceleration (pulley and rope are, , massless), (1) Zero Q) ‘, Be (4) 2g pie, , 10. Three equal weights A, B and C, of mass 2 kg cach are hanging on, a string passing over a fixed, pulley which is frictionless as, shown in figure, The tension in, the string connecting weight B, and C is, (1) Zero, Q)33N, , (2)13N, (4) 19.6N