MCQ
25041. If the resultant of a number of forces acting on a body is 0. Then the body will be equilibrium........
Yes
No
25042. The slope of a stress-strain curve in the elastic deformation region is-
elastic modulus
plastic modulus
poison's ratio
none of the above
25043. 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
25044. 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
25045. 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
25046. The angles between two forces when the resultant is maximum & minimum respectively are-
0° & 180°
180° & 0°
90° & 180°
90° & 0°
25047. The friction experienced by a body, when at rest, is known as-
static friction
dynamic friction
limiting friction
coefficient of friction
25048. The friction experienced by a body, when in motion, is known as-
rolling friction
static friction
limiting friction
dynamic friction
25049. A force acting in the opposite direction to the motion of the body is called force of friction.
Agree
Disagree
25050. A framed structure is imperfect, if the number of members are ---(2j-3).
equal to
less than
greater than
either b or c
25051. The terms 'leverage' & 'mechanical advantage' of a compound lever have got same meaning-----
Right
Wrong
25052. 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
25053. 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
25054. 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
25055. 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
25056. The resultant of two forces P & Q is R. If Q is doubled, the new resultant is perpendicular to P. Then-
P=Q
Q=R
Q=2R
none of these
25057. An irregular body may have more than one centre of gravity.....
Yes
No
25058. The center of gravity of a T-section 100mm x 150mm x 50mm from its bottom is-
50mm
75mm
87.5mm
125mm
25059. A smooth cylinder lying on its convex surface remains in- equilibrium.
stable
neutral
unstable
none of these
25060. Two forces are acting at an angle of 120°. The bigger force is 40N and the resultant is perpendicular to the smaller one. The smaller force is-
20N
40N
80N
none of this