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 at Bissoy

• The acceleration of a body sliding down an inclined surface is
  ক

  g sinθ

  খ

  g cosθ

  গ

  g tanθ

  ঘ

  None of these
• The friction experienced by a body, when in motion, is known as
  ক

  Rolling friction

  খ

  Dynamic friction

  গ

  Limiting friction

  ঘ

  Static friction
• Work done is said to be zero, when
  ক

  Some force acts on a body, but displacement is zero

  খ

  No force acts on a body but some displacement takes place

  গ

  Either (A) or (B)

  ঘ

  None of the above
• 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 resultant of two forces P and Q (such that P > Q) acting along the same straight line, but in opposite direction, is given by
  ক

  P + Q

  খ

  P - Q

  গ

  $$\frac{{\text{P}}}{{\text{Q}}}$$

  ঘ

  $$\frac{{\text{Q}}}{{\text{P}}}$$
• 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 below figure shows the three coplanar forces P, Q and R acting at a point O. If these forces are in equilibrium, then<br><img src="/images/question-image/mechanical-engineering/engineering-mechanics/1528353615-1.jpg" title="Engineering Mechanics mcq question image" alt="Engineering Mechanics mcq question image">
  ক

  $$\frac{{\text{P}}}{{\sin \beta }} = \frac{{\text{Q}}}{{\sin \alpha }} = \frac{{\text{R}}}{{\sin \gamma }}$$

  খ

  $$\frac{{\text{P}}}{{\sin \alpha }} = \frac{{\text{Q}}}{{\sin \beta }} = \frac{{\text{R}}}{{\sin \gamma }}$$

  গ

  $$\frac{{\text{P}}}{{\sin \gamma }} = \frac{{\text{Q}}}{{\sin \alpha }} = \frac{{\text{R}}}{{\sin \beta }}$$

  ঘ

  $$\frac{{\text{P}}}{{\sin \alpha }} = \frac{{\text{Q}}}{{\sin \gamma }} = \frac{{\text{R}}}{{\sin \beta }}$$
• 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 center of gravity of a trapezium with parallel sides 'a' and 'b' lies at a distance of 'y' from the base 'b', as shown in the below figure. The value of 'y' is<br><img src="/images/question-image/mechanical-engineering/engineering-mechanics/1528353535-11.jpg" title="Engineering Mechanics mcq question image" alt="Engineering Mechanics mcq question image">
  ক

  $${\text{h}}\left( {\frac{{2{\text{a}} + {\text{b}}}}{{{\text{a}} + {\text{b}}}}} \right)$$

  খ

  $$\frac{{\text{h}}}{2}\left( {\frac{{2{\text{a}} + {\text{b}}}}{{{\text{a}} + {\text{b}}}}} \right)$$

  গ

  $$\frac{{\text{h}}}{3}\left( {\frac{{2{\text{a}} + {\text{b}}}}{{{\text{a}} + {\text{b}}}}} \right)$$

  ঘ

  $$\frac{{\text{h}}}{3}\left( {\frac{{{\text{a}} + {\text{b}}}}{{2{\text{a}} + {\text{b}}}}} \right)$$
• 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 velocity ratio of a first system of pulleys with 4 pulleys is
  ক

  4

  খ

  8

  গ

  16

  ঘ

  20
• 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 total momentum of a system of masses (i. e. moving bodies) in any one direction remains constant, unless acted upon by an external force in that direction. This statement is called
  ক

  Newton's first law of motion

  খ

  Newton's second law of motion

  গ

  Principle of conservation of energy

  ঘ

  Principle of conservation of momentum
• The moment of the force ‘P’ about ‘O’ as shown in the below figure is<br> <img src="/images/question-image/mechanical-engineering/engineering-mechanics/1528353506-20.jpg" title="Engineering Mechanics mcq question image" alt="Engineering Mechanics mcq question image">
  ক

  P × OA

  খ

  P × OB

  গ

  P × OC

  ঘ

  P × AC
• 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

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