Applied Mechanics MCQ Practice Questions (Civil Engineering) Set 4

A ball is dropped from a height of 2.25 m on a smooth floor and rises to a height of 1.00 m after the bounce. The coefficient of restitution between the ball and the floor is:


Options are :

  • 0.33
  • 0.67
  • 0.57
  • 0.44

Answer :0.67

Newtons's Law of Motion is:


Options are :

  • The rate of change of momentum is directly proportional to the impressed force, and takes place in the same direction, in which the force acts
  • Every body continues in its state of rest or of uniform motion, in a straight line, unless it is acted upon by some external force
  • All the above
  • To every action, there is always an equal and opposite reaction

Answer :All the above

A rod 5 m in length is moving in a vertical plane. When it is inclined at 60 to horizontal, its lower end is moving horizontally at ?3 m/sec and upper end is moving in vertical direction. The velocity of its upper end, is:


Options are :

  • 1.0 m/sec
  • 1.5 m/sec
  • 2.5 m/sec
  • 0.5 m/sec
  • 3.0 m/sec

Answer :1.0 m/sec

Applied Mechanics MCQ Practice Questions (Civil Engineering) Set 5

Time of flight of a projectile on a horizontal plane, is:


A.


B.


C.


D.


Options are :

  • D
  • A
  • B
  • C

Answer :A

If two bodies of masses M1 and M2 (M1 > M2) are connected by alight inextensible string passing over a smooth pulley, the tension in the string, will be given by:


A.


B.


C.


D.


Options are :

  • B
  • D
  • C
  • A

Answer :A

Principle of Transmissibility of Forces states that, when a force acts upon a body, its effect is:


Options are :

  • Different at different points on its line of
  • Same at every point on its line of action
  • None of these
  • Minimum if it acts at the C.G. of the body
  • Maximum if it acts at the centre of gravity of the body

Answer :Same at every point on its line of action

Applied Mechanics MCQ Practice Questions (Civil Engineering) Set 6

Two shots fired simultaneously from the top and bottom of a vertical tower with elevations of 30 and 45 respectively strike a target simultaneously. If horizontal distance of the target from the tower is 1000 m, the height of the tower is:


Options are :

  • 375 m
  • 350 m
  • 400 m
  • 425 m

Answer :425 m

A marble ball is rolled on a smooth floor of a room to hit a wall. If the time taken by the ball in returning to the point of projection is twice the time taken in reaching the wall, the coefficient of restitution between the ball and the wall, is:


Options are :

  • 0.50
  • 0.25
  • 1.0
  • 0.75

Answer :0.50

If two forces of 3 kg and 4 kg act at right angles to each other, their resultant force will be equal to:


Options are :

  • None of these
  • 7 kg
  • 5 kg
  • 1 kg
  • 1/7 kg

Answer :5 kg

Applied Mechanics MCQ Practice Questions (Civil Engineering) Set 7

The resultant of two forces acting at right angles is 5 kgf and if they act at an angle of 60, it is ?37 kgf. The magnitudes of the forces are :


Options are :

  • 3 kgf, 4 kgf
  • 4 kgf, 5 kgf
  • 2 kgf, 3 kgf
  • 5 kgf, 3 kgf

Answer :3 kgf, 4 kgf

Centre of gravity of a thin hollow cone lies on the axis of symmmetry at a height of:


Options are :

  • One-third of the total height above base
  • None of these
  • One-fourth of the total height above base
  • One-half of the total height above base

Answer :One-third of the total height above base

Applied Mechanics MCQ Practice Questions (Civil Engineering) Set 8

On a ladder resting on a rough ground and leaning against a smooth vertical wall, the force of friction acts:


Options are :

  • Zero at its upper end
  • Perpendicular to the wall at its upper end
  • None of these
  • Upwards at its upper end
  • Downwards at its upper end

Answer :Zero at its upper end

If the resultant of two forces P and Q acting at an angle ? makes an angle ? with P, then tan ? equals:


A.


B.


C.


D.


Options are :

  • A
  • B
  • D
  • C

Answer :B

Power developed by a torque, is:


A.

2?NT kg m/min


B.


C.


D.

All the above


Options are :

  • A
  • D
  • B
  • C

Answer :D

Applied Mechanics MCQ Practice Questions (Civil Engineering) Set 9

A body of weight 14 g appears to weight 13 g when weighed by a spring balance in a moving lift. The acceleration of the lift at that moment was:


Options are :

  • 0.5 m/sec^(2)
  • 1 cm/sec^(2)
  • 1 m/sec^(2)
  • 0.7 m/sec^(2)

Answer :0.7 m/sec^(2)

Periodic time of body moving with simple harmonic motion, is:


Options are :

  • Directly proportional to its angular velocity
  • Inversly proportional to the square of its angular velocity
  • Directly porportional to the square of its angular velocity
  • Inversely proportional to its angular velocity

Answer :Inversely proportional to its angular velocity

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


Options are :

  • 3 t
  • Zero
  • 2.5 t
  • 1 t
  • 2 t

Answer :Zero

The centre of gravity of a plane lamina will not be at its geometrical centre if it is a:


Options are :

  • Equilateral triangle
  • Rectangle
  • Square
  • Circle
  • Right angled triangle

Answer :Right angled triangle

The unit of moments in M.K.S system, is:


Options are :

  • kg/m^(2)
  • kg/sec
  • kg/sec^(2)
  • kgm

Answer :kgm

The rotational velocity of a satellite is increased by 450 m per second if its launch is done from equator:


Options are :

  • Eastward
  • Northward
  • Southward
  • Upward
  • Westward

Answer :Eastward

Applied Mechanics MCQ Practice Questions (Civil Engineering) Set 1

On a mass m describing a circular path of radius r, the centrifugal force:


A.

Acts tangentially to the circular path


B.

Acts towards the centre of rotation


C.

Acts away from the centre of rotation


D.

is


Options are :

  • B
  • A
  • C
  • D

Answer :B

The load shared by the member BC of the structure shown in below figure is:


Options are :

  • 3?2t
  • 4 t
  • 3 t
  • 2?3t

Answer :4 t

The piston of a steam engine moves with a simple harmonic motion. The crank rotates 120 r.p.m. and the stroke length is 2 metres. The linear velocity of the piston when it is at a distance of 0.5 metre from the centre, is:


Options are :

  • 12.88 m/sec
  • 10.88 m/sec
  • 8.88 m/sec
  • 5.88 m/sec

Answer :10.88 m/sec

Applied Mechanics MCQ Practice Questions (Civil Engineering) Set 2

The gravitational force makes a satellite go round the earth in a circular orbit, if it is projected with an initial velocity of:


Options are :

  • All the above
  • 11.11 km/sec at a height of 37, 400 km
  • 8.04 km/sec at a height of 285 km
  • 11.26 km/sec, the satellite escapes the pull of the earth

Answer :All the above

Two parallel forces 20 kg and 15 kg act. In order that the distance of the resultant from 20 kg force may be the same as that of the former resultant was from 15 kg, the 20 kg force is diminished by:


Options are :

  • 6.25 kg
  • 8.75 kg
  • 10.5 kg
  • 5.5 kg

Answer :8.75 kg

The centre of gravity of a homogenous body is the point at which the whole:


Options are :

  • Volume of the body is assumed to be concentrated
  • Area of the surface of the body is assumed to be concentrated
  • All the above
  • Weight of the body is assumed to be concentrated

Answer :Weight of the body is assumed to be concentrated

If a ball which is dropped from a height of 2.25 m on a smooth floor attains the height of bounce equal to 1.00 m, the coefficient of the restitution between the ball and floor, is:


Options are :

  • 0.33
  • 0.25
  • 0.67
  • 0.50
  • 0.75

Answer :0.50

From a solid cylinder of height 8 cm and radius 4 cm, a right circular cone is scooped out on the same base and having the same height as that of the cylinder. The c.g. of the remainder is at a height of:


Options are :

  • 4.5 cm
  • 5.5 cm
  • 5.0 cm
  • 5.25 cm

Answer :5.0 cm

A vehicle weighing w kg is to run on a circular curve of radius r. If the height of its centre of gravity above the road level is h and the distance between the centres of wheels is 2a, the maximum velocity, in order to avoid over turning, will be:


A.


B.


C.


D.


Options are :

  • D
  • C
  • A
  • B

Answer :B

Pick up the incorrect statement from the following. In a simple harmonic motion:


Options are :

  • Acceleration is zero at the mean position
  • Velocity is minimum at the end of the storke
  • Velocity is maximum at its mean position
  • Acceleration is minimum at the end of the stroke

Answer :Acceleration is minimum at the end of the stroke

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