VOCLET 2014 Question and answer EEMC

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1. When a rectangular bar is subjected to a tensile force, the volumetric strain is equal to- A) e(1-2/m)
2.  The radius of gyration of a circular area of radius r with respect to centroidal axis is- C) 0.5r
3. Which of the following do not have identical dimensions?- A) Momentum and impulse
4. Factor of safety is the ratio of – C) Ultimate stress to working stress
5. Hooke’s law is valid upto- C) elastic limit
6. When a bullet is fired from a gun, it is recoiled in the backward direction. It is due to – C) conservation of momentum.
7. Which of the following is non dimensional?- C) Strain
8. Couple is a – B) Bound Vector
9. When acceleration is proportional to displacement, the type of motion is called – C) Simple Harmonic Motion
10. Which one of the following has the dimension of Stress?- D) [ML-1T-2]
11. Work done will be positive when the angle Theta(θ) between Force (vector F) and displacement (vector s) is- A) 0<= Theta(θ)<=90
12. Two vectors of equal magnitude have a resultant equal to either of them, then the angle between them will be- C) 120 degree
13.  Which one is the right relationship?- B) 1 Joule=10^7
14. The angle between (Vector P + Vector Q) and (Vector P –Vector Q) will be – A) 90 Degree
15. The forces, which do not meet at a point but their line of action lie in one plane, are called- D) coplanar non-concurrent forces
16. Two bodies of mass m and 4m are moving with equal kinetic energy. The ratio of their linear momentum is- C) 1:2
17. A block of mass m=2 kg is pulled by a force F=40N upwards through a height h=2m. Work done by its weight mg will be (take g=10m/s2)- C) -40 J
18. The unit of ratio of displacement and acceleration is- B) second2
19. Fill in the blanks with suitable option: Frictional force is never ____ the force required to prevent motion.-A) greater than
20. maximum and minimum values of the resultant of two forces acting at a point are 7N and 3N respectively. The smaller force will be equal to- C) 2 N
21. lami’s theorem is valid for – C) three forces only
22. The end of a knife is made pointed to have – D) more pressure
23. A Train has a constant speed of 40 m/s on a level road against resistive force of magnitude 30 kN. The power of the engine will be – A) 1.2 x 10^3 kW
24. The moment of the force F (represented by the vector AB) about the point O will be represented by – A) 2 OAB
25. If the value of Young’s modulus E=2.0 x 10^11 N/m2, then what will be its value in kgf/cm2? (take g=10 m/s2)- C) 2 x 10^6 kgf/cm2
26. The elongation of the steel bar 1 m long and 1.5 cm2 cross sectional area when subjected to a pull of 1.5 x 10^4 N (take Young’s modulus E= 2.0 x 10^11 Nm2) will be – B) 0.5 mm
27. The moment of inertia of a circular area of radius ‘R’ about an axis parallel to the centroidal horizontal axis and tangential to the circle is- D) 0.25 Pi R^4
28. The centre of gravity of solid cone is at a distance (h-the height of cone)- C) 3/4 h from the vertex
29. For a circular lamina M.I. about any diameter will be --- that of its polar moment of inertia. Fill in the blank from following options.- A) half
30. The moment of inertia of a triangle of base 10 cm and height 12 cm about the cetrroidal axis parallel to the base is – D) 1440 cm^4
31. A simple wheel and axis has diameter of the wheel is 60 cm and diameter of the axel is 15 cm the thickness of each rope is 1.2 cm. The velocity ratio of the machine is – C) 3.78
32. Opening a bottle cap with a opener involves – D) Torque
33. The centroid of a quadrant of a circle of radius R lies a height of --- from base.- B) 4R/3pi
34.  If a horizontal member subjected to loads is stable with the aid of only one support, that support should be --- support and the beam is called a --- beam. – C) hinged, cantilever
35. The dimensional formula of “light-year” is – A) M^0LT^0
36. The metallic alloy used uin the bar preserved as International ‘Meter’ is - -D) Platinum-iridium
37. The SI unit of temperature is- A) Kelvin
38. The branch of Mechanics which deals with the bodies in motion due to application of forces is called- B) dynamics
39. ‘Kilowatt-hour’ is a unit of-  B) energy
40. In a certain lifting machine 100 N is just able to lift a load of 840 N. If V.R. = 10, friction of the machine in terms of load is- A) 16 N
41. The potential energy of a mass of m-kg, raised through a height of h-meter, is- C) mgh joule
42. The displacement x of a body varies with time as x= -1/3 t^2 + 16t+3; where ‘x’ is in meters and ‘t’ is in seconds. The time taken by the body to come to rest is – C) 24 s
43. A body starting from rest and moving with constant acceleration covers 20 m in the forst second. The distance travelled by it in the second second  is- B) 30 m
44. In a third system of pulleys having 4 pulleys, the number of strings are – D) 4
45. The distance through which a screw thread advances axially in one turn is called- B) pitch
46. The time of flight of a projectile on a horizontal plane is – A) 2u sin a/g
47. Three forces 27 N, 36 N and 45 N acting at a point are in equilibrium. The angle between 27 N and 45 N is – C) π – cos-1 3/5
48. If K.E. of a body is increased by 300%, their momentums will increased by – A) 100%
49. The distance of centroid of a semicircular section measured from its diameter is – B) 4r/3π
 50. Modular Ratio of two materials is the ratio of their – A) section modulus.

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