  ## Applied Mechanics MCQ Practice Questions (Civil Engineering) Set 3

Options are :

• 65
• 55
• 60
• 50
• 70

Options are :

• D
• B
• C
• A

Options are :

• E
• A
• D
• C
• B

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

Options are :

• The C.G. of a triangle is at the intersecton of its medians
• The C.G. of a semicircle is at a distance of r/2 from the centre
• The C.G. of an ecllipse is at the intersection of axes
• The C.G. of a rectangle is at the intersection of its diagonals
• The C.G. of a circle is at its centre

Answer :The C.G. of a semicircle is at a distance of r/2 from the centre

Options are :

• 4
• 2
• 4.5
• 5
• 3

Options are :

• BC
• BD
• ED
• DC

##### The moment of inertia of the shaded portion of the area shown in below figure about the X-axis, is: Larger image Options are :

• 329.34 cm^(4)
• 529.34 cm^(4)
• 429.34 cm^(4)
• 229.34 cm^(4)

Options are :

• ??2l/g
• ??l/g
• ??2g/l
• ??g/2l
• ??l/2g

Options are :

• 6.3 m/sec
• 8.3 m/sec
• 9.3 m/sec
• 7.3 m/sec

##### P is the force acting on a body whose mass is m and acceleration is f. The equation P - mf = 0, is known as:

Options are :

• None of these
• Equation of statics
• Equation of dynamics
• Equation of dynamic equilibrium

##### The resultant of two forces acting at right angles is ?34 kg and acting at 60� is 70 kg. The forces are:

Options are :

• ?3 kg and 5 kg
• 3 kg and ?5 kg
• 1 kg and 4 kg
• 3 kg and 5 kg
• 2 kg and 3 kg

Answer :3 kg and 5 kg

Options are :

• 3/4
• 2
• 1/2
• 1/4

##### A body A of mass 6.6 kg which is lying on a horizontal platform 4.5 m from its edge is connected to the end of a light string whose other end is supporting a body of mass 3.2 kg as shown in below figureIf the friction between the platform and the body A is 1/3, the acceleration is: Larger image Options are :

• 1.00 m/sec^(2)
• 0.5 m/sec^(2)
• 1.25 m/sec^(2)
• 0.75 m/sec^(2)

##### A satellite is said to move in a synchronous orbit if it moves at an altitude of 36, 000 km with a maximum velocity of about:

Options are :

• 11, 000 km per hour
• 10, 000 per hour
• 9000 km per hour
• 7000 km per hour
• 8000 km per hour

Answer :11, 000 km per hour

Options are :

• A
• D
• E
• C
• B

Options are :

• 10.4 t
• 10.8 t
• 10.2 t
• 10.6 t

Options are :

• 5 cm
• 4 cm
• 2 cm
• 3 cm

##### Pick up the correct statement from the following. A rubber ball when strikes a wall rebounds but a lead ball of same mass and velocity when strikes the same wall, falls down:

Options are :

• None of these
• Momentum of rubber ball is less than that of lead ball
• Change in momentum suffered by lead ball is less that of rubber ball
• Rubber and lead balls undergo equal changes in momentum

Options are :

Options are :

• A
• B
• C
• D
• E

Options are :

• v = 1/?2gh
• v = 2gh
• v = ?2gh
• h^(2)/2g
• v = 2gh^(2)

##### The apparent weight of a man in a moving lift is less than his real weight when it is going down with:

Options are :

• Uniform speed
• An acceleration
• Retardation
• Linear momentum

##### The maximum frictional force which comes into play, when a body just begins to slide over the surface of a an other body, is known:

Options are :

• Limiting friction
• Sliding friction
• None of these
• Rolling friction

##### The necessary condition of equilibrium of a body, is:

Options are :

• All of these
• Algebraic sum of the moments of the forces about a point must be zero
• Algebraic sum of horizontal components of all the forces must be zero
• Algebraic sum of vertical components of all the forces must be zero

##### A stone of mass 1 kg is tied to a string of length 1 m and whirled in a horizontal circle at a constant angular speed 5 rad/sec. The tension in the string is:

Options are :

• None of these
• 5 N
• 15 N
• 25 N
• 10 N

Options are :

• 437.5 cm^(4)
• 337.5 cm^(4)
• 137.5 cm^(4)
• 37.5 cm^(4)
• 237.5 cm^(4)

Options are :

• C
• B
• D
• A

Options are :

• 2300 m
• 2200 m
• 2500 m
• 2100 m
• 2000 m

Options are :

• D
• B
• C
• A

##### The angle of friction is:

Options are :

• The force of friction at which the body is just about to move
• The angle between the normal reaction and the resultant of normal raction and limiting friction
• The ratio of the friction and the normal reaction
• The force of friction when the body is in motion

Answer :The angle between the normal reaction and the resultant of normal raction and limiting friction

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