Applied Mechanics MCQ Practice Questions (Civil Engineering) Set 1

The maximum velocity of a body vibrating with a simple harmonic motion of amplitude 150 mm and frequency 2 vibrations/sec, is:


Options are :

  • 1.885 m/sec
  • 0.18845 m/sec
  • 188.5 m/sec
  • 18.85 m/sec

Answer :1.885 m/sec

Applied Mechanics MCQ Practice Questions (Civil Engineering) Set 2

The Law of Polygon of Forces states that:


Options are :

  • If forces acting on a point can be represented in magnitude and direction by the sides of a polygon in order, the forces are in equilibrium
  • If forces acting on a point can be represented in magnitde and direction by the sides of a polygon taken in order, then the resultant of the forces will be represented in magnitude and direction by the closing side of the polygon
  • If forces acting on a point can be represented of a polygon taken in order, their sides of a polygon taken in order, their resultant will be represented in magnitude and direction by the closing side of the polygon, taken in opposite order
  • If a polygen representing the forces acting at point in a body is closed, the forces are in equilibrium

Answer :If forces acting on a point can be represented of a polygon taken in order, their sides of a polygon taken in order, their resultant will be represented in magnitude and direction by the closing side of the polygon, taken in opposite order

Parallelogram Law of Forces states, "if two forces acting simultaneously on a particle be represented in magnitude and direction by two adjacent sides of a parallelogram, their resultant may be represented in magnitude and direction by:


Options are :

  • The diagonal of the parallelogram which does not pass through the point of intersection of the forces"
  • The diagonal of the parallelogram which passes through the point of intersection of the forces"
  • Its shorter side"
  • Half the sum of the diagonals"
  • Its longer side"

Answer :The diagonal of the parallelogram which passes through the point of intersection of the forces"

The equation of motion of a particle starting from rest along a straight line is x = t^(3) - 3t^(2) + 5. The ratio of the accelerations after 5 sec and 3 sec will be:


Options are :

  • 5
  • 4
  • 3
  • 2

Answer :2

Applied Mechanics MCQ Practice Questions (Civil Engineering) Set 3

If a body moves in such a way that its velocity increases by equal amount in equal intervals of time, it is said to be moving with:


Options are :

  • A uniform retardation
  • A uniform acceleration
  • None of these
  • A variable retardation
  • A variable acceleration

Answer :A variable acceleration

If three rigid rods are hinged together to form a triangle and are given rotary as well as translatory motion, the number of instantaneous centres of the triangle, will be:


Options are :

  • 1
  • 2
  • 5
  • 4
  • 3

Answer :3

The resultant of two forces P and Q acting at an angle ?, is:


A.

P^(2) + Q^(2) + 2P sin ?


B.

P^(2) + Q^(2) + 2P cos ?


C.

P^(2) + Q^(2) + 2P tan ?


D.


E.


Options are :

  • C
  • B
  • D
  • A

Answer :D

Applied Mechanics MCQ Practice Questions (Civil Engineering) Set 4

Two forces act an angle of 120. If the greater force is 50 kg and their resultant is perpendicular to the smaller force, the smaller force is:


Options are :

  • 20 kg
  • 40 kg
  • 35 kg
  • 25 kg
  • 30 kg

Answer :25 kg

At a given instant ship A is travelling at 6 km/h due east and ship B is travelling at 8 km/h due north. The velocity of B relative to A is:


Options are :

  • 1 km/hrs
  • 10 km/hrs
  • 14 km/hrs
  • 7 km/hrs
  • 2 km/hrs

Answer :10 km/hrs

The product of mass and velocity of a moving a body, is called:


Options are :

  • Impulse
  • Moment
  • Power
  • Momentum

Answer :Momentum

Applied Mechanics MCQ Practice Questions (Civil Engineering) Set 5

A string of length 90 cm is fastened to two points A and B at the same level 60 cm apart. A ring weighing 120 g is slided on the string. A horizontal force P is applied to the ring such that it is in equilibrium vertically below B

The value of P is:


Options are :

  • 100 g
  • 40 g
  • 80 g
  • 60 g

Answer :80 g

The tension in a cable supporting a lift:


Options are :

  • Is less when the lift is moving upwards
  • Is less when the lift is moving downwards
  • Remains constant whether its moves downwards or upwards
  • Is more when the lift is moving downwards

Answer :Is less when the lift is moving downwards

A bullet weighing 200 g is fired horizontally with a velocity of 25 m/sec from a gun carried on a carriage which together with the gun weighs 100 kg. The velocity of recoil of the gun, will be:


Options are :

  • 1.00 m/sec
  • 0.01 m/sec
  • 0.05 m/sec
  • 1.5 m/sec

Answer :0.05 m/sec

Applied Mechanics MCQ Practice Questions (Civil Engineering) Set 6

A square hole is punched out of a circular lamina, the diagonal of the square being the radius of the circle. If r is the radius of the circle, the C.G. of the remainder from the corner of the square on the circumference will be:


A.


B.


C.


D.


Options are :

  • A
  • C
  • B
  • D

Answer :C

Pick up the correct statement from the following:


Options are :

  • The gravitational intensity declines with height
  • All the above
  • Nature plays an important role in the launch of a satellite
  • The earth's gravity reduces the speed of a satellite by 32 km per second
  • The gravitational force relents as the satellite climbs higher

Answer :All the above

The C.G. of a right circular cone lies on its axis of symmetry at a height of:


Options are :

  • h/3
  • h/4
  • h/6
  • h/2
  • h/5

Answer :h/4

Applied Mechanics MCQ Practice Questions (Civil Engineering) Set 7

The angle which an inclined surface makes with the horiontal when a body placed on it is on the point of moving down, is called:


Options are :

  • None of these
  • Angle of friction
  • Angle of inclination
  • Angle of repose

Answer :Angle of repose

The unit of Moment of Inertia of a body, is:


Options are :

  • m^(4)
  • m^(3)
  • None of these
  • m^(2)
  • m

Answer :m^(4)

The centre of gravity of a triangle is at the point where three:


Options are :

  • None of these
  • Medians of the triangle meet
  • Bisectors of the angle of the triangle meet
  • Perpendicular bisectors of the sides of the triangle meet

Answer :Medians of the triangle meet

Applied Mechanics MCQ Practice Questions (Civil Engineering) Set 8

Engineer's units of force, is:


Options are :

  • All the above
  • Newton in absolute units
  • Newton and dyne in absolute units
  • Dyne in absolute units

Answer :Newton in absolute units

The c.g. of the shaded area of the below figure whose curve OM is a parabola from y-axis, is:


A.


B.


C.


D.


E.


Options are :

  • B
  • D
  • E
  • C
  • A

Answer :B

The c.g. of a thin hollow cone of height h, above its base lies on the axis, at a height of:


A.


B.


C.


D.


Options are :

  • A
  • B
  • C
  • D

Answer :C

Applied Mechanics MCQ Practice Questions (Civil Engineering) Set 9

The length of a Second's pendulum, is:


Options are :

  • 101.10 cm
  • 101 cm
  • 99.4 cm
  • 100 cm
  • 99.0 cm

Answer :99.4 cm

A load of 500 kg was lifted through a distance of 13 cm. by an effort of 25 kg which moved through a distance of 650 cm. The efficiency of the lifting machine is:


Options are :

  • 55%
  • 40%
  • 30%
  • 50%

Answer :40%

One Newton force, is:


Options are :

  • 10^(3) dynes
  • 10^(6) dynes
  • 10^(7) dynes
  • 10^(4) dynes
  • 10^(5) dynes

Answer :10^(5) dynes

The locus of the instantaneous centre of a moving rigid body, is:


Options are :

  • Straight line
  • Centroid
  • Involute
  • Spiral

Answer :Centroid

Which one of the following statements is true ?


Options are :

  • The tangent of the angle of repose is equal to coefficient of friction
  • The angle of repose is equal to angle of friction
  • The tangent of the angle of friction is equal to coefficeint of friction
  • All the above

Answer :All the above

If the gravitational accelerational at any place is doubled, the weight of a body, will:


Options are :

  • None of these
  • Not be affected
  • Be reduced to half
  • Be doubled

Answer :Be doubled

The vertical reaction at the support A of the structure shown in below figure, is


Options are :

  • 3 t
  • 2 t
  • 1 t
  • 2.5 t

Answer :3 t

To attain the synchronous orbit, the launch of a satellite, is done from a place:


Options are :

  • on 30 latitude
  • on the poles
  • on 60 latitude
  • on 45 latitude
  • on equator

Answer :on equator

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