Applied Mechanics MCQ Practice Questions (Civil Engineering) Set 9

A stone is whirled in a vertical circle, the tension in the string, is maximum:


Options are :

  • At all the positions
  • When the stone is at the highest position
  • When the string is horizontal
  • When the stone is at the lowest position

Answer :When the stone is at the lowest position

Angular acceleration of a particle may be expressed as:


Options are :

  • Revolutions/sec
  • Radians/sec^(2)
  • Degrees/sec^(2)
  • All the above

Answer :All the above

The unit of force in C.G.S. system of units, is called:


Options are :

  • Dyne
  • Newton
  • Kg
  • All the above

Answer :Dyne

If two forces each equal to T in magnitude act at right angles, their effect may be neutralised by a third force acting along their bisector in opposite direction whose magnitude will be:


Options are :

  • None of these
  • 3 T
  • 1/2 T
  • 2 T
  • ?2 T

Answer :?2 T

Applied Mechanics MCQ Practice Questions (Civil Engineering) Set 1

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


Options are :

  • Away from the wall at its upper end
  • Upwards at its upper end
  • Towards the wall at its upper end
  • None of these
  • Downwards at its upper end

Answer :Upwards at its upper end

Varigon's theorem of moments states:


Options are :

  • Algebraic sum of the moments of two forces about any point, is equal to the moment of their resultant about that point
  • Algebraic sum of the moments of the forces about any point in their plane, is equal to the moment of their resulant about that point
  • Arithmetical sum of the moments of the forces about any point in their plane, is equal to the moment of their resultant about that point
  • Arithmetical sum of the moments of two forces about any point, is equal to the moments of their resultant about that point

Answer :Algebraic sum of the moments of the forces about any point in their plane, is equal to the moment of their resulant about that point

? rad/sec is the angular velocity of a crank whose radius is r. If it makes ? with inner dead centre and obliquity of the connecting rod l is ?, the velocity v of the piston, is given by the equation:


Options are :

  • ?^(2)(l sin ? - r cos ? tan ?)
  • ?(l sin ? + r cos ? tan ?)
  • ?^(2)(l sin ? + r cos ? tan ?)
  • ?^(2)(l cos ? + r sin ? tan ?)

Answer :?(l sin ? + r cos ? tan ?)

Applied Mechanics MCQ Practice Questions (Civil Engineering) Set 2

For a particle moving with a simple harrmonic motion, the frequency is:


Options are :

  • None of these
  • Directly proportional to its angular velocity
  • Inversely proportional to its angular velocity
  • Inversely proportional to periodic time
  • Directly proportional to periodic time

Answer :Inversely proportional to periodic time

A satellite goes on moving along its orbit round the earth due to:


Options are :

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

Answer :Centrifugal force

Total no of instantaneous centres of a machine having n links, is:


A.

n/2


B.

n


C.

(n - 1)


D.


Options are :

  • C
  • B
  • D
  • A

Answer :D

Applied Mechanics MCQ Practice Questions (Civil Engineering) Set 3

To double the period of oscillation of a simple pendulum:


Options are :

  • Its length should be doubled
  • The mass of its bob should be quadrupled
  • Its length should be quadrupled
  • The mass of its bob should be doubled

Answer :Its length should be quadrupled

If a spherical body is symmetrical about its perpendicular axes, the moment of inertia of the body about an axis passing through its centre of gravity as given by Routh's rule is obtained by dividing the product of the mass and the sum of the squares of two semi-axes by n where n is:


Options are :

  • 3
  • 2
  • 4
  • 5

Answer :5

A sphere is resting on two planes BA and BC which are inclined at 45 and 60 respectively with the horizontal. The reaction on the plane BA will be:


Options are :

  • Less than that on BC
  • None of these
  • Zero
  • More than that of BC
  • Equal to that on BC

Answer :More than that of BC

Applied Mechanics MCQ Practice Questions (Civil Engineering) Set 4

The angle of projection for a range is equal to the distance through which the particle would have fallen in order to acquire a velocity equal to the velocity of projection, will be:


Options are :

  • 75
  • 30
  • 60
  • 45

Answer :75

The centre of gravity of a trapezoidal dam section whose top width is a, bottom width is b and the vertical side is a, from its vertical face is:


A.


B.


C.


D.

None of these


Options are :

  • B
  • D
  • C
  • A

Answer :A

In simple harmonic motion, acceleration of a particle is proportional to:


Options are :

  • Displacement
  • Direction
  • None of these
  • Velocity
  • Rate of change of velocity

Answer :Displacement

Applied Mechanics MCQ Practice Questions (Civil Engineering) Set 5

A train weighing 196 tonnes experiences a frictional resistance of

per tonne. The speed of the train at the top of a down gradient 1 in 78.4 is 36 km/hour. The speed of the train after running 1 km down the slope, is:


Options are :

  • 5?10 m/sec
  • 10?5 m/sec
  • 5?3 m/sec
  • 3?5 m/sec

Answer :5?10 m/sec

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