Applied Mechanics MCQ Practice Questions (Civil Engineering) Set 2

A projectile is thrown at an angle a to the horizontal with ? velocity v. It will have the maximum centripetal acceleration:


Options are :

  • At the start
  • Else where
  • At the top of the trajectory
  • As it strikes the ground

Answer :At the start

Applied Mechanics MCQ Practice Questions (Civil Engineering) Set 3

A cable loaded with 0.5 tonne per horizontal metre span is stretched between supports in the same horizontal line 400 m apart. If central dip is 20 m, the minimum tension in the cable, will be:


Options are :

  • 200 tonnes at the left support
  • 200 tonnes at the centre
  • 200 tonnes at the right support
  • 500 tonnes at the centre

Answer :500 tonnes at the centre

The total time of collision and restitution of two bodies, is called:


Options are :

  • Time of collision
  • Period of impact
  • All the above
  • Period of collision

Answer :All the above

The beam shown in below figure is supported by a hinge at A and a roller at B. The reaction RA of the hinged support A of the beam, is:


Options are :

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

Answer :10.2 t

Applied Mechanics MCQ Practice Questions (Civil Engineering) Set 4

A satellite moves in its orbit around the earth due to:


Options are :

  • Gravitational force
  • Centripetal force
  • None of these
  • Centrifugal force

Answer :Centripetal force

u1 and u2 are the velocities of approach of two moving bodies in the same direction and their corresponding velocities of separation are v1 and v2. As per Newton's law of collision of elastic bodies, the coefficient of restitution (e) is given by:


A.


B.


C.


D.


Options are :

  • A
  • C
  • B
  • D

Answer :C

If the radius of the earth is 600 km the height of a mountain above sea level at the top of which a beat seconds pendulum at sea level, looses 27 seconds a day, is:


Options are :

  • 2000 metres
  • 1000 metres
  • 25000 metres
  • 1500 metres
  • 500 metres

Answer :2000 metres

Applied Mechanics MCQ Practice Questions (Civil Engineering) Set 5

Maximum efficiency of a screw jack for the angle of friction ?, is:


A.


B.


C.


D.


Options are :

  • A
  • C
  • B
  • D

Answer :D

The masses of two balls are in the ratio of 2 : 1 and their respective velocities are in the ratio of 1 : 2 but in opposite direction before impact. If the coefficient of restitution is

, the velocities of separation of the balls will be equal to:


Options are :

  • Half the original velocity in the same direction
  • Original velocity in the opposite direction
  • Original velocity in the same direction
  • Half the original velocity in the opposite direction

Answer :Original velocity in the opposite direction

The mechanical advantage of an ideal machine is 100. For moving the local through 2 m, the effort moves through:


Options are :

  • 0.02 m
  • 2.5 m
  • 20 m
  • 2 m

Answer :0.02 m

Applied Mechanics MCQ Practice Questions (Civil Engineering) Set 6

When a body in equilibrium undergoes an infinitely small displacement, work imagined to be done, is known as:


Options are :

  • Virtual work
  • Negative work
  • None of these
  • Imaginary work

Answer :Virtual work

Work may be defined as:


Options are :

  • Force x velocity
  • Force x acceleration
  • None of these
  • Force x distance

Answer :Force x distance

If g1 and g2 are the gravitational accelerations on two mountains A and B respectively, the weight of a body when transported from A to B will be multiplied by:


A.

g1


B.

g2


C.


D.


Options are :

  • D
  • A
  • C
  • B

Answer :D

Applied Mechanics MCQ Practice Questions (Civil Engineering) Set 7

The forces which meet at one point and have their lines of action in different planes are called:


Options are :

  • Coplaner non-concurrent forces
  • Non-coplaner concurrent forces
  • None of these
  • Non-coplaner non-current forces
  • Intersecting forces

Answer :Non-coplaner concurrent forces

The reaction at the support A of the beam shown in below figure is:


Options are :

  • 2 t
  • 5.8 t
  • 0.2 t
  • 3.5 t

Answer :2 t

If the tension in a cable supporting a lift moving upwards is twice the tension when the lift is movng downwards, the acceleration of the lift, is:


A.


B.


C.


D.


Options are :

  • A
  • B
  • D
  • C

Answer :B

Applied Mechanics MCQ Practice Questions (Civil Engineering) Set 8

A uniform rod 9 m long weighing 40 kg is pivoted at a point 2 m from one end where a weight of 120 kg is suspended. The required force acting at the end in a direction perpendicular to rod to keep it equilibrium, at an inclination 60 with horizontal, is:


Options are :

  • 60 kg
  • 10 kg
  • 40 kg
  • 100 kg

Answer :10 kg

A particle moves along a straight line such that distance x traversed in t seconds is given by x = t^(2)(t + 1), the acceleration of the particle, will be:


Options are :

  • 6t - 2
  • 3t^(2) + 2t
  • 6t + 2
  • 3t - 2
  • 3t^(3) - 2t

Answer :6t + 2

If a particle is projected inside a horizontal tunnel which is 554 cm high with a velocity of 60 m per sec, the angle of projection for maximum range, is:


Options are :

  • 9
  • 12
  • 10
  • 8
  • 11

Answer :10

Applied Mechanics MCQ Practice Questions (Civil Engineering) Set 9

Joule is the unit of:


Options are :

  • Force
  • None of these
  • Work
  • Torque
  • Power

Answer :Work

For perfectly elastic bodies, the value of coefficient of restitution is:


Options are :

  • 1.0
  • 0.5
  • Between 0 and 1
  • Zero

Answer :1.0

For a simple pendulum, the period of one oscillation is:


A.

2??l/2g


B.

??2g/l


C.

2??l/g


D.

2??g/2l


Options are :

  • A
  • D
  • B
  • C

Answer :C

If v and ? are linear and angular velocities, the centripetal acceleration of a moving body along the circular path of radius r, will be:


A.


B.


C.


D.


E.

r?


Options are :

  • D
  • A
  • B
  • E
  • C

Answer :B

The motion of a particle is described by the relation x = t2- 10t + 30, where x is in metres and t in seconds. The total distance travelled by the particle from t = 0 to t = 10 seconds would be:


Options are :

  • 60 m
  • 50 m
  • Zero
  • None of these
  • 30 m

Answer :Zero

A number of forces acting simultaneously on a particle of a body:


Options are :

  • May be replaced by a single force through C.G. of the body
  • May be replaced by a couple
  • May be replaced by a single force
  • May not be replaced by a single force
  • None of these

Answer :May be replaced by a single force

The instantaneous centre of a member lies at the point of intersection of two lines drawn at the ends of the member such that the lines are inclined to the direction of motion of the ends at:


Options are :

  • 90
  • 30
  • 45
  • 60

Answer :90

A 49 kg lady stands on a spring scale in an elevator. During the first 5 sec, starting from rest, the scale reads 69 kg. The velocity of the elevator will be:


Options are :

  • 15 m/sec
  • 20 m/sec
  • 10 m/sec
  • 25 m/sec

Answer :20 m/sec

? is coefficient of friction. A wheeled vehicle travelling on a circular level track will slip and overturn simultaneously if the ratio of its wheel distance to the height of its centroid, is:


A.

?


B.

2?


C.

3?


D.

?


Options are :

  • A
  • B
  • D
  • C

Answer :B

Three forces which act on a rigid body to keep it in equilibrium. The forces must be coplanar and:


Options are :

  • Concurrent parallel
  • Parallel
  • Concurrent
  • None of these

Answer :Concurrent

The force acting on a point on the surface of a rigid body may be considered to act:


Options are :

  • on the periphery of the body
  • At the centre of gravity of the body
  • on any point on the line of action of the force
  • At any point on the surface normal to the line of action of the force

Answer :on any point on the line of action of the force

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