Applied Mechanics Set 1

Mechanical Engineering

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This set of Applied Mechanics Multiple Choice Questions & Answers (MCQs) focuses on Applied Mechanics Set 1

Q1 | A point moves in such a manner that its distance from a fixed point is equal to its distance from a fixed line multiplied by a constant greater than one. The locus of the path traced by the point will be a
  • Cycloid
  • Hyperbola
  • Circle
  • Involute
  • Ellipsc
Answer: Involute
Q2 | A cannon of barrel length 2 m fires a shell of weight 6 kg with a muzzle velocity of 50 m/sec. The force exerted by the gases on the shell would be approximately
  • 76 t
  • 19 t
  • 152 t
  • 8.5 t
  • 38 t
Answer: 38 t
Q3 | According to the principle of transmissibility of forces, when a force acts upon a body ; its effect is
  • Minimum when it acts at C.G. of the body
  • Maximum when it acts at C.G. of the body
  • Different at different points of body
  • Same at every point in its line of action
  • None of the above
Answer: Same at every point in its line of action
Q4 | Using force, length and time as fundamental quantities, the dimensions of mass would be
  • FL-2T+2
  • FL-1T+2
  • FL-1T+1
  • 107 dynes
  • FL-2T+1
Answer: FL-1T+2
Q5 | Minimum horsepower of pump required for filling 50m3 water tank, 20 metres high from ground in 30 minutes by lifting water from a well 5 metres below the ground level is
  • 5.45 KW
  • 7.5 KW
  • 6.81 KW
  • Tapered bearing
  • 66.8 KW
Answer: 6.81 KW
Q6 | A bob of simple pendulum oscillating in air is made to oscillate in oil. The time period will
  • Increase
  • Decrease
  • Not change
  • Decrease but reduction depends on viscosity of oil
  • None of the above
Answer: Increase
Q7 | A weight of 4.9 N rests on a rough horizontal floor that has a coefficient of friction of 0.5. If g = 9.8 m/s2, the smallest horizontal force that gives the weight an acceleration of 4m/s2 is most nearly
  • 2.5 N
  • 3 N
  • 2 N
  • 4.5 N
  • 4.9 N
Answer: 4.5 N
Q8 | Two forces of 6 and 8 kg act at right angles to each other, the resultant force will be
  • 100
  • 28
  • 41
  • 14
  • 10
Answer: 10
Q9 | The resultant of coplaner parallel forces is found by load line diagram, while the position is found by
  • link polygen
  • funicular polygon
  • string polygon
  • any of the above
  • 107 dynes
Answer: any of the above
Q10 | The units of moment of inertia of an area are
  • kg - m
  • m4
  • kg - m4
  • kg - m3
  • (kg - m)2
Answer: m4
Q11 | Te dimensions of frequency are
  • 107 dynes
  • MLT
  • L-1
  • T-1
  • L-1T-1
Answer: T-1
Q12 | When a train is rounding a curve to prevent side thrust on the wheel flanges of cars
  • Opposite thrust is created to counter balance this thrust
  • Guide rail sections are provided to take care of thrust
  • Thrust eliminators are provided in the train
  • Outside rails are realised
  • Rail section is made thick on curvature
Answer: Outside rails are realised
Q13 | Instantaneous centre for a rolling wheel on a straight track will be at
  • 107 dynes
  • A
  • B
  • C
  • D
Answer: D
Q14 | A 100 kg flywheel having a radius of gyration of 1 m is rotating at 1000 rpm. The angular momentum of the flywheel about its axis of rotation, in kg m2/s is
  • 1000
  • 107 dynes
  • 10,000
  • 10,470
  • 5235
Answer: 10,470
Q15 | M.I. of sphere of 0.5 m radius about a mutually perpendicular axis (Z-axis) when its M.I. about X-axis and Y-axis are 50 kgm2 and 50 kgm2 is
  • 50 Kgm2
  • Tapered bearing
  • 100 Kgm2
  • 25 Kgm2
  • 12.5 Kgm2
Answer: 50 Kgm2
Q16 | Three forces A, B and C of magnitudes 8 N, 12 N and 20 N acting on a particle are in equilibrim. It can be concluded that
  • 107 dynes
  • B and C act in opposite directions
  • one of the forces in non-coplaner
  • A and B act at 90?
  • one of the forces is non-concurrent
Answer: B and C act in opposite directions
Q17 | A cylindrical bar 10 metres long elongates 0.1 mm under a load. The strain in the material of the bar will be
  • 10--4
  • 10--5
  • 10--7
  • All of the above
Answer: 10--5
Q18 | The limiting force of fiction is
  • The friction force acting on a body when it is in motion
  • The value of friction force which stops the movement of the body
  • The value of friction force which cannot exceed under a situation
  • The friction force acting when the body is just about to move
  • Double of the normal friction
Answer: The friction force acting when the body is just about to move
Q19 | If a solid sphere rolls on a horizontal surface, then the ratio of its rotational kinetic energy to its total kinetic energy is
  • 1 ; 7
  • 3 ; 7
  • 107 dynes
  • 4 ; 7
  • 2 ; 7
Answer: 2 ; 7
Q20 | Which of the following is scalar quantity
  • Area of triangle
  • Displacement of a particle
  • Acceleration of car
  • Force of friction
  • Velocity a gear
Answer: Area of triangle
Q21 | The gravitational field at the surface of the moon is one sixth of that at the surface of the earth. A 72 kg man weighs on the surface of the moon
  • 137.7 N
  • 250
  • 72 N
  • 420 N
  • 117.7 N
Answer: 117.7 N
Q22 | If three non-parallel forces hold a rigid body in equilibrium, they must
  • be non-coneurrent
  • be colinear
  • 107 dynes
  • be equal in magnitude
  • be concurrent
Answer: be concurrent
Q23 | A stone dropped from a baloon that was ascending at the rate of 30 ft/sec, reaches ground after 10 secs. The height of the baloon where stone was dropped was
  • 3420 ft
  • 107 dynes
  • 4520 ft
  • 2310 ft
  • 1310 ft
Answer: 1310 ft
Q24 | A force F = 2i + 3j - k is passing through the origin. Its moment about point (1, 1, 0) is
  • 107 dynes
  • i + j + k
  • 2i + 3j
  • zero
  • i - j - k
Answer: i + j + k
Q25 | An iron sphere of mass 30 kg and an aluminium sphere of mass 10 kg, both having the same diameter are dropped vertically from a cliff. When they are 10 metrs from the ground, they have identical
  • Accelerations
  • Momenta
  • Kinetic energies
  • Potential energies
  • All of the above
Answer: Accelerations
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