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The edge of an aluminum cube is 10 cm One face of the cube is firmly fixed to a vertical wall A mass of 100 kg is attached to the opposite face of the cube The vertical deflection of this face is G 25 10 Pa NCERT XI Pg 248 2 3 x 10 6 m 1 4 x 10 7 m 3 2 x 10 6 m 4 1 x 10 6 m 14 A rigid bar of mass 15 kg is supported symmetrically by three wires each 2 0 m long Those at each end are of copper and the middle one is of iron If tension in each rod is same the ratio of diameters is nearly NCERT XI Pg 248 2 0 8 1 6 3 4 2 4 2 0 15 The density of water at a depth where pressure is 80 0 atm Given density at the surface is 1 03 x 10 kg m B 2 2 10 N m NCERT XI Pg 248 1 1 034 10 kg m 2 1 34 10 kg m 3 1 64 x 10 kg m 4 2 084 10 kg m 16 A rod of length 1 05 m having negligible mass is supported at its ends by two wires of steel wire A and aluminum wire B of equal lengths as shown in figure The cross sectional areas of wire A and B are 2 0 mm and 4 0 mm respectively The distance x from left end where a mass m is suspended in order to produce equal stresses is 18 A 19 m NCERT XI Pg 249 1 70 cm 2 35 cm 3 65 cm 4 40 cm 17 In Q16 the distance x from left end to produce equal strains is B NCERT XI Pg 249 2 43 2 cm 1 70 cm 3 65 cm 4 35 cm A 15 kg mass fastened to the end of a steel wire of unstretched length 1 0 m is whirled in a vertical circle with an angular velocity of 4 radian s at the bottom of the circle The cross sectional area of the wire is 0 065 cm The elongation of the wire when the mass is at the lowest point is g 10 m s NCERT XI Pg 248 2 2 05 mm 1 1 93 mm 3 1 65 mm 4 3 05 mm A mild steel wire of length 2L and cross sectional area A is stretched within elastic limit horizontally between two pillars as shown in the figure A mass m is suspended from the mid point of the wir Strain in the 20

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