Applied Mechanics MCQ Practice Questions (Civil Engineering) Set 3

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 velocity ratio of the lifting machine is:


Options are :

  • 65
  • 55
  • 60
  • 50
  • 70

Answer :50

If G is the Gauge of track, v is velocity of the moving vehicle, g is the acceleration due to gravity and r is the radius of a circular path, the required superelevation is:


A.


B.


C.


D.


Options are :

  • D
  • B
  • C
  • A

Answer :D

The c.g. of the shaded area of the below figure from the x-axis is:


A.


B.


C.


D.


E.


Options are :

  • E
  • A
  • D
  • C
  • B

Answer :C

Applied Mechanics MCQ Practice Questions (Civil Engineering) Set 4

Pick up the incorrect statement from the following:


Options are :

  • The C.G. of a triangle is at the intersecton of its medians
  • The C.G. of a semicircle is at a distance of r/2 from the centre
  • The C.G. of an ecllipse is at the intersection of axes
  • The C.G. of a rectangle is at the intersection of its diagonals
  • The C.G. of a circle is at its centre

Answer :The C.G. of a semicircle is at a distance of r/2 from the centre

The equation of motion of a particle starting from rest along a straight line is x = t3 - 3l2 + 5. The ratio of the velocities after 5 sec and 3 sec will be:


Options are :

  • 4
  • 2
  • 4.5
  • 5
  • 3

Answer :5

The member which does not carry zero force in the structure shown in below figure, is:


Options are :

  • BC
  • BD
  • ED
  • DC

Answer :BD

Applied Mechanics MCQ Practice Questions (Civil Engineering) Set 5

The moment of inertia of the shaded portion of the area shown in below figure about the X-axis, is:


Options are :

  • 329.34 cm^(4)
  • 529.34 cm^(4)
  • 429.34 cm^(4)
  • 229.34 cm^(4)

Answer :429.34 cm^(4)

For a simple pendulum, time period for a beat, is:


Options are :

  • ??2l/g
  • ??l/g
  • ??2g/l
  • ??g/2l
  • ??l/2g

Answer :??l/g

Two particles have been projected at angles 64 and 45 to the horizontal. If the velocity of projection of first is 10 m/sec, the velocity of projection of the other for equal horizontal ranges is:


Options are :

  • 6.3 m/sec
  • 8.3 m/sec
  • 9.3 m/sec
  • 7.3 m/sec

Answer :9.3 m/sec

Applied Mechanics MCQ Practice Questions (Civil Engineering) Set 6

P is the force acting on a body whose mass is m and acceleration is f. The equation P - mf = 0, is known as:


Options are :

  • None of these
  • Equation of statics
  • Equation of dynamics
  • Equation of dynamic equilibrium

Answer :Equation of dynamics

The resultant of two forces acting at right angles is ?34 kg and acting at 60 is 70 kg. The forces are:


Options are :

  • ?3 kg and 5 kg
  • 3 kg and ?5 kg
  • 1 kg and 4 kg
  • 3 kg and 5 kg
  • 2 kg and 3 kg

Answer :3 kg and 5 kg

The ratio of the moment of inertia of a rectangle about its centroidal axis to the moment of inertia about its base, is:


Options are :

  • 3/4
  • 2
  • 1/2
  • 1/4

Answer :1/4

Applied Mechanics MCQ Practice Questions (Civil Engineering) Set 7

A body A of mass 6.6 kg which is lying on a horizontal platform 4.5 m from its edge is connected to the end of a light string whose other end is supporting a body of mass 3.2 kg as shown in below figure

If the friction between the platform and the body A is 1/3, the acceleration is:


Options are :

  • 1.00 m/sec^(2)
  • 0.5 m/sec^(2)
  • 1.25 m/sec^(2)
  • 0.75 m/sec^(2)

Answer :1.00 m/sec^(2)

A satellite is said to move in a synchronous orbit if it moves at an altitude of 36, 000 km with a maximum velocity of about:


Options are :

  • 11, 000 km per hour
  • 10, 000 per hour
  • 9000 km per hour
  • 7000 km per hour
  • 8000 km per hour

Answer :11, 000 km per hour

For the given values of initial velocity of projection and angle of inclination of the plane, the maximum range for a projectile projected upwards will be obtained, if the angle of projection is:


A.

? =

-


B.

? =

+


C.

? =

-


D.

? =

-


E.

? =

-


Options are :

  • A
  • D
  • E
  • C
  • B

Answer :B

Applied Mechanics MCQ Practice Questions (Civil Engineering) Set 8

The reaction RB of the roller support B of the beam shown in below figure is:


Options are :

  • 10.4 t
  • 10.8 t
  • 10.2 t
  • 10.6 t

Answer :10.8 t

A trolley wire weighs 1 kg per metre length. The ends of the wire are attached to two poles 20 m apart. If the horizontal tension is 1000 kg, the central dip of the cable is:


Options are :

  • 5 cm
  • 4 cm
  • 2 cm
  • 3 cm

Answer :5 cm

Pick up the correct statement from the following. A rubber ball when strikes a wall rebounds but a lead ball of same mass and velocity when strikes the same wall, falls down:


Options are :

  • None of these
  • Momentum of rubber ball is less than that of lead ball
  • Change in momentum suffered by lead ball is less that of rubber ball
  • Rubber and lead balls undergo equal changes in momentum

Answer :None of these

Applied Mechanics MCQ Practice Questions (Civil Engineering) Set 9

If the linear velocity of a point on the rim of a wheel of 10 m diameter, is 50 m/sec, its angular velocity will be:


Options are :

  • 5 rad/sec
  • 15 rad/sec
  • 10 rad/sec
  • 20 rad/sec

Answer :5 rad/sec

The height at which the end of a rope of length l should be tied so that a man pulling at the other end may have the greatest tendency to overturn the pillar, is:


A.

l


B.


C.


D.


E.

None of these


Options are :

  • A
  • B
  • C
  • D
  • E

Answer :C

The velocity of a body fallen from height h, on reaching the ground is given by:


Options are :

  • v = 1/?2gh
  • v = 2gh
  • v = ?2gh
  • h^(2)/2g
  • v = 2gh^(2)

Answer :v = ?2gh

The apparent weight of a man in a moving lift is less than his real weight when it is going down with:


Options are :

  • Uniform speed
  • An acceleration
  • Retardation
  • Linear momentum

Answer :An acceleration

The maximum frictional force which comes into play, when a body just begins to slide over the surface of a an other body, is known:


Options are :

  • Limiting friction
  • Sliding friction
  • None of these
  • Rolling friction

Answer :Limiting friction

The necessary condition of equilibrium of a body, is:


Options are :

  • All of these
  • Algebraic sum of the moments of the forces about a point must be zero
  • Algebraic sum of horizontal components of all the forces must be zero
  • Algebraic sum of vertical components of all the forces must be zero

Answer :All of these

Applied Mechanics MCQ Practice Questions (Civil Engineering) Set 1

A stone of mass 1 kg is tied to a string of length 1 m and whirled in a horizontal circle at a constant angular speed 5 rad/sec. The tension in the string is:


Options are :

  • None of these
  • 5 N
  • 15 N
  • 25 N
  • 10 N

Answer :25 N

The moment of inertia of a hollow circular section whose external diameter is 8 cm and internal diameter is 6 cm, about centroidal axis, is:


Options are :

  • 437.5 cm^(4)
  • 337.5 cm^(4)
  • 137.5 cm^(4)
  • 37.5 cm^(4)
  • 237.5 cm^(4)

Answer :137.5 cm^(4)

A square hole is made in a circular lamina, the diagonal of the square is equal to the radius of the circleas shown in below figure the shift in the centre of gravity is:


A.


B.


C.


D.


Options are :

  • C
  • B
  • D
  • A

Answer :A

The acceleration of a train starting from rest at any instant is

where V is the velocity of the train in m/sec. The train will attain a velocity of 36 km/hour after travelling a distance of:


Options are :

  • 2300 m
  • 2200 m
  • 2500 m
  • 2100 m
  • 2000 m

Answer :2300 m

The centre of gravity of the trapezium as shown in below figure from the side is at a distance of:


A.


B.


C.


D.


Options are :

  • D
  • B
  • C
  • A

Answer :A

The angle of friction is:


Options are :

  • The force of friction at which the body is just about to move
  • The angle between the normal reaction and the resultant of normal raction and limiting friction
  • The ratio of the friction and the normal reaction
  • The force of friction when the body is in motion

Answer :The angle between the normal reaction and the resultant of normal raction and limiting friction

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