Voclet EEMC answer

VOCLET 2013 solved paper EEMC
51. ML-3T0 is the dimention of Ans.: B) Density	52. Kinetic energy is the measure of amount of work done by an object Ans.: C) Both A) and B)
53. In moving from ground floor to top floor through a building's stair by simple walking and by running in hurry. We do Ans.: B) Same amount of work expending different amounts of power.	54. A ball of mass 0.1 Kg strikes a wall normally with speed of 30 m/s and rebounds with a speed of 20 m/s . The impulse of the force exerted by the wall on the ball is Ans.: A) 1 N-S
55. If a force P acts axially along a rod of length 'l' and cross-sectional area 'A', the strain energy per unit volume will be Ans.: A) P2 l / 2AE	56. The ratio of moment of inertia of a rectangle and that of a tringle, having same base and height with respect to their base would be Ans.: C) 4:1
57. The center of gravity of a triangle lies at the point of intersection of Ans.: C) medians	58. The position of C.G. of a solid hemisphere of radius r lies on the central radius at a distance Ans.: A) 3r/8
59. The center of percussion of a solid cylinder of radius r resting on a horizontal plane will be Ans.: C) 2r/3	60. The co-efficient of friction depends on Ans.: B) nature of surface
61. Two particales with masses in the ratio 1:4 are moving with equal kinetic energies. The magnitude of their linear momentums will conform to the ratio Ans.: A) 1:2	62. The K.E of a body of mass(m) is E. Its momentum is Ans.: A) √(2mE)
63. If coplanar, concurrent force P,Q,R (as in fig.) are in equilibirum then (Figure/Picture) Ans.: B) P/sinα = Q/sinβ = R/sinγ	64. If a number of coplanar forces act at a point, then their resultant is given by Ans.: C) √((∑V)2 + (∑H)2)
65. A simply supported beam of length 'l' and diameter 'd' carries a point load 'W' at its mid-span. The maximum bending stress produced will be Ans.: B) Wl/4πd3	66. A concentrated load P acts on a simply supported beam of span l at a distance l/3 from the left support. The bending moment at the point of application of load is given by Ans.: D) 2Pl/9
67. A simply supported beam carries several concentrated loads. The shear force would be maximum Ans.: B) at either of the supports	68. The angle of the inclined plane at which a body, placed on the plane, just begins to slide down is called Ans.: D) Angle of repose
69. M.I. of a solid cone, of mass 'm' and base radius 'r' about its own axis is Ans.: If you know the answer please write it to me	70. In a simple wheel and axle machine, a load of 25N is raised by an effort of 5N at an efficiency of 80%. If the diameter of wheel is 375mm, what is the diameter of the axle? Ans.: D) 60 mm
71. When a rectangular bar is subjected to a tensile stress, the volumetric strain is equal to Ans.: If you know the answer please share with me	72. When a solid cylinder of mass 'M' and radius 'R' rotates about its axis with an angular speed 'ω', then kinetic energy of rotation is Ans.: D) MRω2/2
73. In an open flat belt drive if T1= tight side tension and T2= slack side tension, then Ans.: I am unable to find it in your syllsbus.	74. The power transmitted by a belt is maximum when maximum tension in the belt is Ans.: I am unable to find it in your syllabus
75. M.I. of a tringular section of base 'b' and height 'h' about its base is Ans.: C) bh3/12	76. Coulomb friction is the friction between Ans.: A) two dry surfaces
77. When P is the effortv and W is the load linear law of machines is given by the relation Ans.: D) P=mW-C	78. When a bar of length 'l', diameter 'd' and specific weight 'w' is rigidly fixed at the upper end and hanging freely, then total elongation of the bar due to self-weight is Ans.: B) wl2/2E
79. A steel bar of 5 mm diameter is heated from 15°C to 40°C and it is free to expand. The bar will induce Ans.: A) no stress	80. When a rectangular bar of length 'l', breadth 'b' and thickness 't' is subjected to an axial pull of P, then linear strain is given by Ans. : Unable to solve
81. To express force, we must know Ans.: D) all of the above	82. If the arm of a couple is 'doubled', its moment will be Ans.: C) doubled
83. A car covers first half of a certain distance with a speed V1 and the second half with a speed V2. The average speed during the whole journey is Ans.: C) 2V1V2 / (V1 + V2 )	84. In the given velocity -time graph, the distance traveled by the body is Ans.: A) 200 m
85. A ball is projected at an angle of 45° to the horizontal. If the horizontal range is 40 m, the maximum height attained by the ball is Ans.:	86. Velocity ratio of a simple machine is the ratio between Ans.: C) velocity of effort and veocity of load
87. The dimension of Modulus of Elasticity is Ans.: A) ML-1T-2	88. Which of the folowing quantities is a vector? Ans.: D) Force
89. Which of the following terms is not a vector quantity ? Ans.: A) Energy	90. The resultant of two forces P and Q is at right angle to P. The angle between the forces is Ans.: B) cos-1(-P/Q)
91. The resultant of two forces of magnitudes 5N and 10N can not be Ans.: B) 6N	92. The scalar (dot) product of two vectors is 2√3 and the magnitude of their vector (cross) product is 2. The angle between the vectors is Ans.: A) 30°
93. If the friction angle is λ, the maximum effciency of a screw jack is Ans.:D) tan λ / (1 + tanλ)	94. When temptarure difference =t; co-efficient of linear expansion'=α; the themal stress of a rod of length 'l' and young's modulus 'E' is given by Ans.: C) Eαt
95. A simply supported beam of length 8m carries a point loadof 4KN at a distance 5m from the left hand end. The maximum BM willl be Ans.: D) 7.5 KN-M	96. The relation between Young's Modulus (E) and Bulk Modulus (K) is given by Ans.: (:()
97. When two springs having stiffness K1 and K2 are connected in series, the resultant stiffness is Ans.: C) K1 K2/(K1+K2)	98. A body of mass 4 Kg initially at rest is acted upon simultaneously by two forces one of 8 N and the other 6N acting at right angle to each other . The K.E. of the body after 10s is Ans.: B) 1250 J
99. The efficiency of a lifting m/c is 45%. The velocity ratio= 20. The effort of 100N will be able to lift a load of Ans.: A) 900 N	100. When a body tends to slid, the relation between angle of repose α and friction angle λ is given by Ans.: A) α=λ
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