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This set of Applied Mechanics Multiple Choice Questions & Answers (MCQs) focuses on Applied Mechanics Set 7

Q1 | The centre of gravity of a plane lamina will not be at its geometrical centre if it is a
  • Square
  • Equilateral triangle
  • Circle
  • Rectangle
  • Right angled triangle
Q2 | Coulomb friction is
  • Friction between solids and liquids
  • Friction between electrically charged bodies
  • Friction between lubricated surface
  • Friction between dry surfaces
  • Friction between bodies having relative motion
Q3 | A framed structure is perfect if it contains members equal to
  • n - 3
  • 2n - 3
  • 2n - 2
  • n - 2
  • 2n - 1
Q4 | Coulomb's law for the force between electric charges most closely resembles
  • Newton's laws of motion
  • Law of conservation of energy
  • Gauss's theorem
  • Newton's law of gravitation
  • None of the above
Q5 | A number of forces acting at a point will be in equilibrium if
  • Sum of the forces is zero
  • Algebraic sum of the forces is zero
  • Sum of the resolved parts in any two perpendicular directions are both zero
  • None of the above
  • The metacentre of the body
Q6 | The springs A and B are identical except that A is stiffer than B, that is KA > kB. If both the springs are stretched by the same amount
  • more work will be expended on A than B
  • same work will be expended in both springs.
  • less work will be expended on A than B
  • 107 dynes
Q7 | A rigid body is suspended vertically at a point and oscillates with a small amplitude under the action of the force of gravity. Such an arrangement is called
  • Simple pendulum
  • Rigid pendulum
  • Second's pendulum
  • Compound pendulum
  • Newton's pendulum
Q8 | A block slides down a frictionless incline making an angle ? with an elevator floor. The acceleration relative to the incline will be maximum when
  • the elevator ascends at constant speed v
  • the elevator descends at constant speed v
  • 107 dynes
  • elevator descends with deceleration a
  • the elevator descends with acceleration a
Q9 | An automobile is travelling at 25 m/s. It takes 0.3 second to apply the brakes after which the deceleration is 6 m/s2. How far, in meters, does the automobile travel before it stops?
  • 45
  • 107 dynes
  • 40
  • 50
  • 60
Q10 | A single purchase crab has a handle 45 cm long and a drum of 25 cm diameter. The pinion has 30 teeth and spur has 150 teeth. The efficiency of the machine is 75%. If the maximum force that can be applied is 500 newtons, the maximum load that can be lifted will be
  • 9860 N
  • 6750 N
  • 20250 N
  • 1250 N
  • 13500 N
Q11 | A body in Simple Harmonic Motion will attain maximum velocity when it passes through
  • Point of 0.75 amplitude
  • Extreme point of the oscillation of L.H.S.
  • Point of half amplitude
  • Extreme point of the oscillation at R.H.S.
  • Mean position
Q12 | A body of weight W is resting at a plane inclined at 30? to the horizontal. It is attached to a string making an angle of 60? with horizontal. If the angle of friction be 30? the tension in the string would be
  • Zero
  • W
  • W/2
  • 2W
  • None of the above
Q13 | A 5 m ladder of mass 25 kg is placed in a position where its inclination to a vertical wall is at 30?. A 100 kg man is to climb the ladder. If the coefficient of static friction is 0.25 the height along ladder at which the slipping will be induced would be
  • 2.4 m
  • 1.6 m
  • 0.8 m
  • 1.2 m
  • 0.5 m
Q14 | Which one of the following is not the law of dry friction?
  • If friction is neglected, the reactions are always normal to the surfaces on contact
  • Friction always acts to oppose the relative motion of the free body
  • If static friction is acting, the value of the friction force may vary from zero to its maximum value
  • The force of friction is always normal to the surface
  • All of the above
Q15 | A 3.2 m diameter balloon is filled with Helium. The total weight of balloon, gas and pay load is 10 kg kg. In an isothermal atmosphere having conditions identical to N.T.P. the balloon will rise to a height of about
  • 6000 m
  • 1500 m
  • 3000 m
  • 2000 m
  • 1000 m
Q16 | The statement the resultant of the external forces applied to a body (rigid or non-rigid) composed of a system of particles is equivalent to the vector summation of the effective forces acting on all particles-is known as
  • Corollary to Newton's laws of motion
  • Principle of dynamics
  • D' Alembert's principle
  • Nowton's law
  • Mohr's principle
Q17 | The moment of a force
  • Occurs about a point
  • Measures the capacity to do useful work
  • Occurs only when bodies are in motion
  • Measures the ability to produce turning or twisting about an axes
  • None of the above
Q18 | In a slider crank mechanism, the crank is rotating at 200 rpm. If length of connecting rod is 8 mts and crank shaft is 2 mts, velocity of crosshead at 30? rotation of crank shaft equals.
  • 30.2 m/s
  • 33.2 m/s
  • 35.8 mts/s
  • 107 dynes
  • 25.5 m/s
Q19 | If the angle of friction is zero a body will experience
  • Infinite friction
  • Zero friction
  • The force of friction will act normal to the plane
  • The force of friction will act in the direction of motion
  • None of the above
Q20 | The excape velocity for the moon is nearly
  • 5 km/s
  • 11.2 km/s
  • 107 dynes
  • 2.4 km/s
  • 1.1 km/s
Q21 | Williot-Mohr diagram is used to determine
  • slope of beams
  • 107 dynes
  • deflection in beams
  • deflection in trusses
  • slope of trusses
Q22 | A body is pushed with a force of 10 N for 0.5 second. The impulse given to the body is
  • 107 dynes
  • 50 Ns
  • 3.5 Ns
  • 5 Ns
  • 2.5 Ns
Q23 | A couple applied to a flywheel of mass 5 kg and of radius of gyration 20 cm produces an angular acceleration of 4 radians/sec2. The torque applied in dyne cm is
  • 8 x 104
  • 8 x 106
  • 8 x 107
  • 8 x 108
  • 8 x 1010
Q24 | The tension T2 will be
  • 60 N
  • 5 N
  • 107 dynes
  • 15 N
  • 30 N
Q25 | The number of revolutions through which a pulley will rotate from rest if its angular acceleration is increased uniformly from zero to 12 rad per sec2 during 4 sec and then uniformly decreased to 0 rad per sec2 during the next 3 sec would be
  • 46.4
  • 26.74
  • 11.6
  • 3.2
  • 17.7