MEC 107

Mechanic practice set  paper 2 11)   A boat sails across a river with a velocity of 10 km/hr. If resultant boat velocity is 14 km/hr, then what is the velocity of river water?  a.  17.20 km/hr b.  10 km/hr c.  9.79 km/hr  d.  4.88 km/hr 12)   According to which law, every action has an equal and opposite reaction? a.  Newton's first law b.  Newton's second law c.  Newton's third law  d.  None of the above 13)   A body exerts a force of 800 N on the floor of the lift which moves upwards with a retardation of 2 m/s 2 . What is mass of the body carried in the lift?  a.  74.02 N b.  81.54 N c.  102.43 N  d.  None of the above 14)   A man of 60 kg moves in a lift of constant velocity 5 m/s. What is the reactive force acting on the man by the elevator? a.  888 N b.  588 N   c.  288 N d.  Zero 15)   When motion is _______, the normal component of acceleration is zero. a.  curvilinear b.  rotational c.  recti

Mechanics Pratice paper 3 21)   Which axial force is determined while analyzing a truss?  a.  compressive force b.  tensile force c.  both a. and b. d.  none of the above ANSWER: both a. and b. 22)   If a body is subjected to plastic impact, _______ a.  only kinetic energy is conserved b.  only momentum is conserved c.  both a. and b. d.  none of the above 23)   An object of 30 kg is moved with a velocity of 2 m/s on a horizontal smooth surface. What is the velocity of the block for 4 seconds if force of 40 N is applied on it in the direction of force? a.  2 m/s b.  4.6 m/s c.  7.33 m/s d.  9.33 m/s ANSWER: 7.33 m/s 24)   If two objects of 30 kg and 10 kg move with equal kinetic energy, then what is the ratio of magnitudes for linear momentum?  a.  √3 : 1 b.  1 : √3 c.  1 : 3√3 d.  1 : 3 ANSWER: √3 : 1 25)   The total momentum of a system __________, if no external impressed force acts on i

Mechanics test paper 4 31)   Which of the following is represented by the area under force-displacement diagram? a.  Impulse b.  Momentum c.  Power d.  Work done  32)   According to work energy principle, a particle of mass m when subjected to unbalanced force system, the work done during displacement by all forces is equal to change in ____________ during displacement. a.  gravitational energy b.  kinetic energy  c.  mechanical energy d.  potential energy 33)   The force for which work done is independent of  _______ is called as conservative force. a.  distance b.  path  c.  time d.  all of the above 34)   A ball is dropped on a horizontal surface from a height of 15 m. What will be the rebounding height of the ball after striking the surface? (coefficient of restitution = 0.8) a.  9.6 m  b.  6.5 m c.  5.6 m d.  Insufficient data 35)   What is the SI unit of linear momentum? a.  kg.m 2  / sec b.  kg.m / sec  c.

Mechanics Practice paper 5 41)   Identify the type of truss shown below. a.  Deficient truss  b.  Perfect truss c.  Redundant truss d.  All of the above 42)   Which of the following statements is false about frame/truss? a.  Bent member is never used in a truss b.  Internal hinges are used to connect members in a truss  c.  All members in the truss are two force members d.  Multiforce members can be used in a frame 43)   Which motion has magnitude of static frictional force directly proportional to normal reaction? a.  Actual motion b.  Impending motion  c.  Both a. and b. d.  None of the above 44)   Which formula is used to calculate angle of static friction (Φ s )? a.  tan -1  μ s   b.  sin -1  μ s c.  cos -1  μ s d.  none of the above 45)   Frictional force depends on ________ a.  surface area in contact b.  roughness of surface   c.  both a. and b. d.  none of the above 46)   Which of the following conditio

Mechanics test paper 6 51)   Which of the following conditions do not change the effect of couple? a.  Shifting of couple to a new position in its plane b.  Shifting of couple to a parallel plane c.  Rotation of couple in its plane d.  All of the above 52)   What are the X and Y components of point P for the force system shown below? a.  X = 186.00 N, Y = 464 N b.  X = 464.23 N, Y = 185 N  c.  X = 466.12 N, Y = -180 N d.  None of the above 53)   If two concurrent forces A and B acting on a point are 200 N and 300 N. What is the magnitude of resultant force, if it makes an angle of 50 o  with each force? a.  471.08 N b.  455.12 N  c.  400.56 N d.  Insufficient data 54)   What is the angle made by side of a square lamina, if it is freely suspended from a corner with the horizontal?  a.  0 o b.  45 o   c.  90 o d.  180 o 55)   What is the C.G of an isosceles triangle of base 20 cm and side 40? a.  12.90 cm  b.  13.28 cm