  ## Applied Mechanics MCQ Practice Questions (Civil Engineering) Set 5

Options are :

• 0.3 R
• 0.2 R
• 0.6 R
• 0.5 R
• 0.4 R

##### When a body moves round a fixed axis, it has:

Options are :

• A rotary motion and translatory motion
• A translatory
• A circular motion
• A rotary motion

##### The Centre of gravity of a 10 x 15 x 5 cm T section from its bottom, is:

Options are :

• 7.85 cm
• 5.0 cm
• None of above
• 8.75 cm
• 7.5 cm

##### A particle moving with a simple harmonic motion, attains its maximum velocity when it passes:

Options are :

• Through a point at half amplitude
• The extreme point of the oscillation
• Through the mean position
• None of these

Options are :

• 5.8 t
• 0.2 t
• 2 t
• 3.5 t

Options are :

• B
• D
• A
• C
• E

Options are :

• tan ?
• sec ?
• cosec ?
• sin ?
• cos ?

##### Pick up the correct statement from the following. The kinetic energy of a body:

Options are :

• Remains constant
• None of these
• Before impact is less than that after impact
• Before impact is more than that after impact
• Before impact is equal to that after impact

Answer :Before impact is more than that after impact

##### If a body is acted upon by a number of coplaner non-concurrent forces, it may:

Options are :

• Move in any one direction
• All the above
• Rotate about itself without moving
• Move in any one direction rotating about itself
• Be completely at rest

##### The motion of a particle moving with S.H.M. from an extremity to the other, constitutes:

Options are :

• Half an oscillation
• One full oscillation
• None of these
• Two oscillations

##### The velocity of a moving body, is:

Options are :

• A vector quantity
• A constant quantity
• None of these
• A scalar quantity

Options are :

• 18 m/sec
• 22 m/sec
• 20 m/sec
• 16 m/sec

Options are :

• D
• B
• C
• A

##### Periodic time of a particle moving with simple harmonic motion is the time taken by the particle for:

Options are :

• Quarter oscillation
• None of these
• Half oscillation
• Complete oscillation

##### The rate of change of displacement of a body with respect to its surrounding, is known:

Options are :

• Speed
• Velocity
• None of these
• Acceleration

##### The frequency of oscillation on moon as compared to that on earth, will be:

Options are :

• 3 times more
• 3 times less
• 2.44 times more
• 2.44 times less

##### In the structure shown in below figure, the member which carries zero force, is: Larger image Options are :

• AB
• All the above
• BE
• BD
• BC

##### Pick up the correct statement from the following:

Options are :

• If two equal and perfectly elastic smooth spheres impinge directly, they interchange their velocities
• If a smooth sphere impinges on another sphere, which is at rest, the latter will move along the line of centres
• If two equal spheres which are perfectly elastic impinge at right angles, their direction after impact will still be at right angles
• All the above
• If a sphere impinges directly on an equal sphere which is at rest, then a fraction (1 - e2) the original kinetic energy is lost by the impact

##### For a self-locking machine, the efficiency should be:

Options are :

• More than 50%
• Less than 60%
• None of these
• 50%

##### The point about which combined motion of rotation and translation of a rigid body takes place, is known as:

Options are :

• Instantaneous axis
• Virtual centre
• Instantaneous centre
• Point of rotation
• All the above

Options are :

• Erg
• Newton
• Joule
• Dyne

##### The direction of projection should bisect the angle between the inclined plane and the vertical for a range of a projectile on inclined plane:

Options are :

• To be zero
• None of the these
• To be maximum
• To be minimum

Options are :

• P tan ?/2
• P sin ?/2
• 2P cos ?/2
• P cos ?/2
• 2P sin ?/2

Options are :

• 2/5 Mr^(2)
• 1/2 Mr^(2)
• 2/3 Mr^(2)
• ?r^(4)/2
• Mr^(2)

##### When a body slides down an inclined surface, the acceleration (f) of the body, is given by:

Options are :

• f = g cos ?
• f = g sin ?
• f = g tan ?
• f = g

Answer :f = g sin ?

Options are :

• 0.5 t ?
• 8.5 t ?
• 1.6 t ?
• 0.5 t ?
• 1.6 t ?

Options are :

• Zero
• 0.5 m/sec
• 2.0 m/sec
• 1.0 m/sec

##### A point subjected to a number of forces will be in equilibrium, if:

Options are :

• Two resolved parts in any two directions at right angles are equal
• None of these
• Algebraic sum of the moments of the forces about the point is zero
• Sum of resolved parts in any two directions at right angles, are both zero
• Algebraic sum of the forces is zero

Answer :Sum of resolved parts in any two directions at right angles, are both zero

##### A rigid body suspended Vertically at a point and oscillating with a small amplitude under the action of the force of gravity, is called:

Options are :

• Second's pendulum
• Simple pendulum
• None of these
• Compour pendulum

Options are :

• kg.m/sec^(3)
• kg.m/sec
• kg.m^(2)/sec
• kg.m/sec^(2)