Applied Mechanics MCQ Practice Questions (Civil Engineering) Set 7

If the horizontal range is 2.5 times the greatest height, the angle of projection of the projectile, is:


Options are :

  • 60
  • 57
  • 59
  • 58

Answer :58

The distance of the c.g. of a semi-circular arc of radius r from its diameter along the radius of symmetry, is:


A.


B.


C.


D.


Options are :

  • B
  • A
  • D
  • C

Answer :D

Applied Mechanics MCQ Practice Questions (Civil Engineering) Set 8

To avoid bending action at the base of a pier:


Options are :

  • Suspension cable and anchor cables are attached to a saddle mounted on rollers on top of the pier
  • Suspension and anchor cables are kept at the same level
  • None the these
  • Suspension and anchor cables are fixed to pier top

Answer :Suspension and anchor cables are fixed to pier top

A Second's pendulum gains 2 minutes a day. To make it to keep correct time its length:


Options are :

  • Is not changed but weight of the bob is decreased
  • Must be decreased
  • Is not changed but weight of the bob is increased
  • Must be increased
  • None of these

Answer :Must be increased

The units of moment of inertia of an area, are:


Options are :

  • m^(3)
  • kg/m^(2)
  • m^(4)
  • kg-m^(2)
  • kg/m

Answer :m^(4)

Applied Mechanics MCQ Practice Questions (Civil Engineering) Set 9

The ratio of the ranges on the inclined plane with motion upward and with motion downward for a given velocity, angle of projection will be:


A.


B.


C.


D.


Options are :

  • B
  • A
  • D
  • C

Answer :B

One end of a light string 4 m in length is fixed to a point on a smooth wall and the other end fastened to a point on the surface of a smooth sphere of diameter 2.25 m and of weight 100 kg

The reaction between the sphere and the wall of the arrangement made is:


Options are :

  • 110 kg
  • 105.5 kg
  • 108.5 kg
  • 102.5 kg

Answer :102.5 kg

One end of a light string 4 m in length is fixed to a point on a smooth wall and the other end fastened to a point on the surface of a smooth sphere of diameter 2.25 m and of weight 100 kg

The tension in the string is:


Options are :

  • 19.5 kg
  • 17.5 kg
  • 22.5 kg
  • 25 kg

Answer :22.5 kg

The resolved part of the resultant of two forces inclined at an angle ? in a given direction is:


Options are :

  • Algebraic sum of the resolved parts of the forces in the direction
  • Sum of the forces multiplied by the sine ?
  • Arithmetical sum of the resolved parts of the forces in the direction
  • Sum of the forces multiplied by the tangent ?
  • Difference of the forces multiplied by cosine ?

Answer :Algebraic sum of the resolved parts of the forces in the direction

A particle moves with a velocity of 2 m/sec in a straight line with a negative acceleration of 0.1 m/sec2. Time required to traverse a distance of 1.5 m, is:


Options are :

  • 10 sec
  • 15 sec
  • 40 sec
  • 30 sec
  • 20 sec

Answer :20 sec

The following is not a law of static friction:


Options are :

  • The force of friction depends upon the roughness of the surface
  • The force of friction is dependent upon the area of contact
  • The force of friction always acts in a direction opposite to that in which the body tends to move
  • The magnitude of the limiting friction bears a constant ratio to the normal reaction between two surfaces

Answer :The force of friction always acts in a direction opposite to that in which the body tends to move

Applied Mechanics MCQ Practice Questions (Civil Engineering) Set 1

Two forces of 6 Newtons and 8 Newtons which are acting at right angles to each other, will have a resultant of:


Options are :

  • 10 Newtons
  • 12 Newtons
  • 8 Newtons
  • 5 Newtons

Answer :10 Newtons

The shape of a suspended cable under its own weight, is:


Options are :

  • Parabolic
  • Circular
  • Catenary
  • Elliptical

Answer :Catenary

Lami's theroem states that:


Options are :

  • Three forces acting at a point are always in equilibrium
  • If three forces acting on a point can be represented in magnitude and direction by the sides of a triangle, the point will be in the state of equilibrium
  • None of these
  • Three coplaner forces acting at a point will be in equilibrium, if each force is proportional to the sine of the angle between the other two
  • Three coplaner forces acting at a point will be in equilibrium if each force is inversely proportional to the sine of the angle between the other two

Answer :Three coplaner forces acting at a point will be in equilibrium, if each force is proportional to the sine of the angle between the other two

Applied Mechanics MCQ Practice Questions (Civil Engineering) Set 2

For the system of the loads shown in below figure, the time required for the 6.6 kg load to fall on the edge, is:


Options are :

  • 3 sec
  • 4 sec
  • 5 sec
  • 1 sec
  • 2 sec

Answer :3 sec

The resultant of the forces acting on a body will be zero if the body:


Options are :

  • Moves with variable velocity in a straight line
  • Rotates
  • Moves along a curved path
  • Does not move at all

Answer :Does not move at all

A body is said to move with Simple Harmonic Motion if its acceleration, is:


Options are :

  • Proportional to the distance from the point of reference and directed towards it
  • Inversely proportion to the distance from the point of reference
  • None of these
  • Proportional to the square of the distance from the point of reference
  • Always directed away from the centre, the point of reference

Answer :Proportional to the distance from the point of reference and directed towards it

Applied Mechanics MCQ Practice Questions (Civil Engineering) Set 3

The following statement is one of the laws of Dynamic friction:


Options are :

  • The magnitude of the kinetic friction bears a constant ratio to the normal reaction between two surfaces. The ratio being slightly less than that in the case of limiting friction
  • For moderate speeds the force of friction remains constant but decreases slightly with the increase of speed
  • All the above
  • The force of friction always acts in a direction opposite to that in which a body is moving

Answer :All the above

According to Law of Triangle of Forces:


Options are :

  • If three forces acting at a point are in equilibrium each force is proportional to the sine of the angle between the other two
  • Three forces acting at a point, can be rep-resented by the sides of a triangle, each side being in proportion to the force
  • Three forces acting along the sides of a triangle are always in equilibrium
  • If three forces acting on a, point can be represented.in magnitude and direction, by the sides of a triangle taken in order, these will be in equilibrium
  • If the forces acting on a particle be represented in magnitude and direction by the two sides of a triangle taken in order, their resultant will be represented in magnitude and direction by the third side of the triangle, taken in opposite order

Answer :If the forces acting on a particle be represented in magnitude and direction by the two sides of a triangle taken in order, their resultant will be represented in magnitude and direction by the third side of the triangle, taken in opposite order

Pick up the correct statement from the following for the structure shown in below figure.


Options are :

  • The horizontal reaction at C is 2?3t ?
  • The horizontal reaction at A is 2?3t ?
  • The vertical reaction at A is zero
  • The vertical reaction at C is 2 t ?
  • All the above

Answer :All the above

Applied Mechanics MCQ Practice Questions (Civil Engineering) Set 4

Power can be expressed as:


Options are :

  • Work/energy
  • Work/time
  • Work x time
  • Work/distance

Answer :Work/time

The velocity ratio of the differential wheel and axle is:


A.


B.


C.


D.


Options are :

  • D
  • C
  • B
  • A

Answer :B

If the angle between the applied force and the direction of motion of a body, is between 90 and 180, the work done, is called:


Options are :

  • Zero work
  • Imaginary work
  • Virtual work
  • Negative work

Answer :Negative work

Applied Mechanics MCQ Practice Questions (Civil Engineering) Set 5

The velocity of a moving body, is:


Options are :

  • A vector quantity
  • None of these
  • A scalar quantity
  • A scalar as well as a vector quantity

Answer :A vector quantity

If two forces acting at a point are in equilibrium, they must be equal in magnitude and their line of action must be along:


Options are :

  • None of these
  • The same line in opposite sense
  • The perpendicular to both the lines
  • The same line in the same sense

Answer :The same line in opposite sense

A projectile is fired with a velocity of 100.3 m/sec. at an elevation of 60. The velocity attained by the projectile when it is moving at a height of 100 m, is:


Options are :

  • 70 m/sec
  • 80 m/sec
  • 85 m/sec
  • 75 m/sec
  • 90 m/sec

Answer :90 m/sec

Equation of motion of a point in a straight line, is:


A.

v = u + ft


B.

S = ut +

ft2


C.

2fS = v2 - u2


D.

All the above


Options are :

  • D
  • A
  • C
  • B

Answer :D

A particle executes a simple harmonic motion. While passing through the mean position, the particle possesses:


Options are :

  • Minimum kinetic, energy and minimum potential energy
  • Maximum kinetic energy and maximum potential energy
  • Minimum kinetic energy and maximum potential energy
  • Maximum kinetic energy and minimum potential energy
  • None of these

Answer :Maximum kinetic energy and minimum potential energy

A projectile is fired at an angle ? to the vertical. Its horizontal range will be maximum when ? is:


Options are :

  • 45
  • 90
  • 0
  • 60
  • 30

Answer :45

According to Kennedy's theorem, if three bodies have plane motions, their instantaneous centres lie on:


Options are :

  • A point
  • Two straight lines
  • A straight line
  • A triangle

Answer :A straight line

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