MCQ
261. 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
262. If rain is falling in the opposite direction of the movement of a pedestrain, he has to hold his umbrella-
more inclined when movirig
less inclined when moving
more inclined when standing
less inclined when standing
263. 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
264. A projectile is fired at an angle 9 to the vertical. Its horizontal range will be maximum when 9 is-
0°
30°
45°
60°
265. Which of the following is a vector quantity?
Energy
mass
momentum
angle
266. Moment of inertia about the base of a triangle of base 'B' and height '' is-
1/24 bh^4
1/18 bh^3
1/12 bh^3
1/6 bh^3
267. 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
268. A solid cone has a height 'h', height of the CG of the cone above the base is-
h/4
2h/4
3h/4
4h/3
269. 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
270. 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
271. 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
272. 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
273. 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.
274. 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
275. 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
276. 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
277. An irregular body may have more than one center of gravity.
agree
disagree
278. 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
279. 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
280. 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