  ## Applied Mechanics MCQ Practice Questions (Civil Engineering) Set 4

Options are :

• 0.33
• 0.67
• 0.57
• 0.44

##### 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

Options are :

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

Options are :

• D
• A
• B
• C

Options are :

• B
• D
• C
• 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

Options are :

• 375 m
• 350 m
• 400 m
• 425 m

Options are :

• 0.50
• 0.25
• 1.0
• 0.75

##### 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

Options are :

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

##### 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

Options are :

• A
• B
• D
• C

Options are :

• A
• D
• B
• C

##### 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)

##### 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

Options are :

• 3 t
• Zero
• 2.5 t
• 1 t
• 2 t

##### 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

Options are :

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

Options are :

• Eastward
• Northward
• Southward
• Upward
• Westward

Options are :

• B
• A
• C
• D

Options are :

• 3?2t
• 4 t
• 3 t
• 2?3t

Options are :

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

##### 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

Options are :

• 6.25 kg
• 8.75 kg
• 10.5 kg
• 5.5 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

Options are :

• 0.33
• 0.25
• 0.67
• 0.50
• 0.75

Options are :

• 4.5 cm
• 5.5 cm
• 5.0 cm
• 5.25 cm

Options are :

• D
• C
• A
• 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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