MCQ
28161. The center of gravity of a right circular solid cone is at a distance of---- from its base, measured along the vertical axis.
h/2
h/3
h/4
h/6
28162. A framed structure is imperfect, if the number of members are ---(2j-3).
equal to
less than
greater than
either b or c
28163. Moment of inertia of a circular section about an axis perpendicular to the section is-
πd³/16
πd³/32
πd^4/64
πd^4/32
ব্যাখ্যা: Izz = Ixx + Iyy = πd^2 /32
28164. The friction experienced by a body, when in motion, is known as-
rolling friction
static friction
limiting friction
dynamic friction
28165. The minimum force required to slide a body of weight W on a rough horizontal plane is-
W sineθ
W coseθ
W tanθ
none of these
28166. If the gravitational acceleration of any place is doubled, then the weight of a body will be-
g/2
g
2g
√2g
28167. The center of gravity of a T-section 100mm x 150mm x 50mm from its bottom is-
50mm
75mm
87.5mm
125mm
ব্যাখ্যা: [Note]: ¯x=a₁ x₁ + a₂ x₂ /a₁ + a₂
=(100x50x125) + (50×100×50) / (100x50) + (50x100) = 87.5
28168. The center of gravity of a semi-circle lies at a distance of ----from its base measured along the vertical radius. 8r
3r/8
3r/4π
4r/3π
8r/3
28169. A redundant frame is also called- frame.
imperfect
deficient
perfect
28170. The slope of a stress-strain curve in the elastic deformation region is-
elastic modulus
plastic modulus
poison's ratio
none of the above
28171. If the resultant of two force P & Q acting at an angle θ, makes an angle α with force P, then-
tanα = P sinθ / P+Q cosθ
tanα = P cosθ / P+Q cosθ
tanα = Q sinθ / P+Q cosθ
28172. If the resultant of a number of forces acting on a body is 0. Then the body will be equilibrium........
Yes
No
28173. The resultant of two force P & Q acting at an angle θ is-
√P^2+Q^2+2PQsinθ
√P^2+Q^2+2PQcosθ
√P^2+Q^2-2PQcosθ
28174. A smooth cylinder lying on its convex surface remains in- equilibrium.
stable
neutral
unstable
none of these
28175. The friction experienced by a body, when at rest, is known as-
static friction
dynamic friction
limiting friction
coefficient of friction
28176. The moment of inertia of a square of side a about an axis through its centre of gravity is-
a^4 /4
a^4 /8
a^4 /12
a^4 /36
28177. The rate of change of displacement of a body is called
velocity
momentum
acceleration
none of these
28178. Which of the following is a scalar quantity?
Force
Acceleration
Speed
Velocity
28179. A force acting in the opposite direction to the motion of the body is called force of friction.
Agree
Disagree
28180. An irregular body may have more than one centre of gravity.....
Yes
No