MCQ
1601. To parallel sides of a trapezium are a and b its heights is h so CG from base is at.......
π x (a+b)/3h
h/3 .b+2a/b+a
3/8.b+a/a-2h
2h/3. b+2a/b+a
1602. Moment of inertia is the-
second moment of force
second moment of area
second moment of mass
all of these
1603. Center of gravity of a solid cone lies on the axis at the height-
one-fourth of the total height above base
one-third of the total height above base
one-half of the total height above base
three-eighth of the total height above the base
1604. The CG of a right circular solid cone of height h lies at the following distance from the base-
h/2
J/3
h/6
h/4
1605. Center of gravity of a thin hollow cone lies on the axis at a height of-
one-fourth of the total height above base
one-third of the total height above base
one-half of the total height above base
three-eighth of the total height above the base
1606. The point through which the whole weight of the body acts is known as--
moment of inertia
center of gravity
center of percussion
center of mass
1607. The center of percussion of the homogeneous rod of length L. suspended at the top will be-
L/2
L/3
3L/4
2L/3
1608. A heavy string attached at two ends at same horizontal level and when central dip is very small approaches the following curve-
Catenary
Parabola
Hyperbola,
Elliptical
1609. From a circular plate of diameter 6 cm is cut out a circle whose diameter is a radius of the plate. Find the c.g. of the remainder from the center of circular plate-
0.5cm
1.0cm
1.5cm
2.5cm
1610. Center of percussion is-
the point of CG
the point of metacentre
the point of application of the resultant of all the forces tending to cause a body to rotate about a certain axis
point of suspension
1611. The center of gravity of a triangle lies at the point of-
concurrence of the medians
intersection of its altitudes
intersection of bisector of angles
intersection of diagonals
1612. Which of the following is a vector quantity?
Energy
mass
momentum
angle
1613. The center of percussion of a solid cylinder of radius r resting on a horizontal plane will be-
r/2
2r/3
r/A
3r/2
1614. An irregular body may have more than one center of gravity.
agree
disagree
1615. The CG of a plane lamina will not be at its geometrical centre in the case of a-
Right angled triangle
Equilateral triangle
Square
square
1616. The centre of a semi-circle lies at a distance of ... from its base measured along the vertical radius.
3π/8
4r/3π
38π/3
3r/4π
1617. The moment of inertia of a square of side K about an axis through its centre of gravity is-
a² /8
a² /12
a^4 /12
a² /16
1618. Kern of a circular section is a concentric circular area having a diameter equal to -
half of the diameter of the section.
One-third of the diameter of the section.
One-fourth of the diameter of the section.
One-fifth of the diameter of the section.
1619. The unit of the radial motion -
m/min
cm/sec
rad/sec
mm/sec
1620. Pick up the incorrect statement from the following-
The CG of a circle is at its center
The CG of a triangle is at the intersection of its medians
The CG of a rectangle is at the inter-rection of its diagonals
The CG of a semicircle is at a distance of r/2 from the center