Engineering Mechanics MCQ

Test your knowledge with important Engineering Mechanics MCQ and their applications. These MCQs are beneficial for competitive exams too. Explore 30+ more Engineering Mechanics MCQs on Bissoy. Bissoy App

• The forces which meet at one point, but their lines of action __________ on the same plane, are Known as non-coplanar concurrent forces.
  ক

  Lie

  খ

  Do not lie

  গ

  Either A or B

  ঘ

  None of these
• The amplitude is always __________ radius of the circle.
  ক

  Equal to

  খ

  Less than

  গ

  Greater than

  ঘ

  None of these
• Tension in the cable supporting a lift is more when the lift is moving __________ with an acceleration.
  ক

  Upwards

  খ

  Downwards

  গ

  Horizontal

  ঘ

  None of these
• In ideal machines, mechanical advantage is __________ velocity ratio.
  ক

  Equal to

  খ

  Less than

  গ

  Greater than

  ঘ

  None of these
• The maximum efficiency of a lifting machine is
  ক

  $$\frac{1}{{\text{m}}}$$

  খ

  $$\frac{{{\text{VR}}}}{{\text{m}}}$$

  গ

  $$\frac{{\text{m}}}{{{\text{VR}}}}$$

  ঘ

  $$\frac{1}{{{\text{mVR}}}}$$
• The moment of inertia of a thin rod of mass 'm' and length '$$l$$', about an axis through its centre of gravity and perpendicular to its length is
  ক

  $$\frac{{{\text{m}}{l^2}}}{4}$$

  খ

  $$\frac{{{\text{m}}{l^2}}}{6}$$

  গ

  $$\frac{{{\text{m}}{l^2}}}{8}$$

  ঘ

  $$\frac{{{\text{m}}{l^2}}}{{12}}$$
• The law of motion involved in the recoil of gun is
  ক

  Newton's first law of motion

  খ

  Newton's second law of motion

  গ

  Newton's third law of motion

  ঘ

  None of these
• A body of weight 'W' is required to move up on rough inclined plane whose angle of inclination with the horizontal is 'α'. The effort applied parallel to the plane is given by (where μ = tanφ = Coefficient of friction between the plane and the body.)
  ক

  P = W tanα

  খ

  P = W tan (α + φ)

  গ

  P = W (sinα + μcosα)

  ঘ

  P = W (cosα + μsinα)
• If a number of coplanar forces acting at a point be in equilibrium, the sum of clockwise moments must be __________ the sum of anticlockwise moments, about any point.
  ক

  Equal to

  খ

  Less than

  গ

  Greater than

  ঘ

  None of these
• The rate of doing work is known as
  ক

  Potential energy

  খ

  Kinetic energy

  গ

  Power

  ঘ

  None of these
• The motion of a wheel of a car is
  ক

  Purely translation

  খ

  Purely rotational

  গ

  Combined translation and rotational

  ঘ

  None of these
• The moment of a force
  ক

  Is the turning effect produced by a force, on the body, on which it acts

  খ

  Is equal to the product of force acting on the body and the perpendicular distance of a point and the line of action of the force

  গ

  Is equal to twice the area of the triangle, whose base is the line representing the force and whose vertex is the point, about which the moment is taken

  ঘ

  All of the above
• The length of a second's pendulum is
  ক

  94.9 cm

  খ

  99.4 cm

  গ

  100 cm

  ঘ

  101 cm
• The velocity ratio of a differential pulley block with D and d as the diameters of larger and smaller pulley, is
  ক

  $$\frac{{\text{D}}}{{{\text{D}} - {\text{d}}}}$$

  খ

  $$\frac{{\text{D}}}{{{\text{D}} + {\text{d}}}}$$

  গ

  $$\frac{{2{\text{D}}}}{{{\text{D}} - {\text{d}}}}$$

  ঘ

  $$\frac{{2{\text{D}}}}{{{\text{D}} + {\text{d}}}}$$
• A cable with a uniformly distributed load per horizontal meter run will take the following shape
  ক

  Straight line

  খ

  Parabola

  গ

  Hyperbola

  ঘ

  Elliptical
• The angular velocity (in rad/s) of a body rotating at N revolutions per minute is
  ক

  $$\frac{{\pi {\text{N}}}}{{60}}$$

  খ

  $$\frac{{\pi {\text{N}}}}{{180}}$$

  গ

  $$\frac{{2\pi {\text{N}}}}{{60}}$$

  ঘ

  $$\frac{{2\pi {\text{N}}}}{{180}}$$
• The Cartesian equation of trajectory is (where u = Velocity of projection, $$\alpha $$ = Angle of projection and x, y = Co-ordinates of any point on the trajectory after t seconds.)
  ক

  $${\text{y}} = \frac{{{\text{g}}{{\text{x}}^2}}}{{2{{\text{u}}^2}{{\cos }^2}\alpha }} + {\text{x}}\tan \alpha $$

  খ

  $${\text{y}} = \frac{{{\text{g}}{{\text{x}}^2}}}{{2{{\text{u}}^2}{{\cos }^2}\alpha }} - {\text{x}}\tan \alpha $$

  গ

  $${\text{y}} = {\text{x}}\tan \alpha - \frac{{{\text{g}}{{\text{x}}^2}}}{{2{{\text{u}}^2}{{\cos }^2}\alpha }}$$

  ঘ

  $${\text{y}} = {\text{x}}\tan \alpha + \frac{{{\text{g}}{{\text{x}}^2}}}{{2{{\text{u}}^2}{{\cos }^2}\alpha }}$$
• The unit of force in S.I. system of units is
  ক

  Dyne

  খ

  Kilogram

  গ

  Newton

  ঘ

  Watt
• The resultant of the two forces ‘P’ and ‘Q’ is ‘R’. If ‘Q’ is doubled, the new resultant is perpendicular to ‘P’. Then
  ক

  P = Q

  খ

  Q = R

  গ

  Q = 2R

  ঘ

  None of these
• The point, through which the whole weight of the body acts, irrespective of its position, is known as
  ক

  Moment of inertia

  খ

  Center of gravity

  গ

  Center of percussion

  ঘ

  Center of mass
• The centre of gravity of an isosceles triangle with base (p) and sides (q) from its base is
  ক

  $$\frac{{\sqrt {4{{\text{p}}^2} - {{\text{q}}^2}} }}{6}$$

  খ

  $$\frac{{4{{\text{p}}^2} - {{\text{q}}^2}}}{6}$$

  গ

  $$\frac{{{{\text{p}}^2} - {{\text{q}}^2}}}{4}$$

  ঘ

  $$\frac{{{{\text{p}}^2} + {{\text{q}}^2}}}{4}$$
• A pair of smith's tongs is an example of the lever of
  ক

  Zeroth order

  খ

  First order

  গ

  Second order

  ঘ

  Third order
• The units of moment of inertia of an area are
  ক

  kg-m²

  খ

  m⁴

  গ

  kg/m²

  ঘ

  m³
• The center of gravity of a quadrant of a circle lies along its central radius (r) at a distance of
  ক

  0.5 r

  খ

  0.6 r

  গ

  0.7 r

  ঘ

  0.8 r
• Static friction is always __________ dynamic friction.
  ক

  Equal to

  খ

  Less than

  গ

  Greater than

  ঘ

  None of these
• The velocity ratio for the first system of pulleys is (where n is the number of pulleys.)
  ক

  n

  খ

  n²

  গ

  2n

  ঘ

  2n - 1
• The periodic time of one oscillation for a simple pendulum is (where $$l$$ = Length of the pendulum.)
  ক

  $$\frac{1}{{2\pi }}\sqrt {\frac{l}{{\text{g}}}} $$

  খ

  $$\frac{1}{{2\pi }}\sqrt {\frac{{\text{g}}}{l}} $$

  গ

  $$2\pi \sqrt {\frac{l}{{\text{g}}}} $$

  ঘ

  None of these
• Which of the following statement is correct in connection with projectiles?
  ক

  A path, traced by a projectile in the space, is known as trajectory.

  খ

  The velocity, with which a projectile is projected, is known as the velocity of projection.

  গ

  The angle, with the horizontal, at which a projectile is projected, is known as angle of projection.

  ঘ

  All of the above
• If a suspended body is struck at the center of percussion, then the pressure on die axis passing through the point of suspension will be
  ক

  Maximum

  খ

  Minimum

  গ

  Zero

  ঘ

  Infinity
• The ratio of static friction to dynamic friction is always
  ক

  Equal to one

  খ

  Less than one

  গ

  Greater than one

  ঘ

  None of these