স্ট্রাকচারাল মেকানিক্স MCQ
21. Which of the following is a scalar quantity?
Force
Acceleration
Speed
Velocity
22. 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
23. One joule is equal to-
0.1 N-m
1 N-m
100 N-m
10 N-m
24. The unit of work in SI unit is-
newton
joule
erg
kg.m
25. When a body falls freely under gravitational force, it possesses---- weight.
no
maximum
minimum
26. Joule is the unit of-
force
energy
work
power
27. The friction experienced by a body, when at rest, is known as-
static friction
dynamic friction
limiting friction
coefficient of friction
28. The friction experienced by a body, when in motion, is known as-
rolling friction
static friction
limiting friction
dynamic friction
29. A framed structure is imperfect, if the number of members are ---(2j-3).
equal to
less than
greater than
either b or c
30. The rate of change of displacement of a body is called
velocity
momentum
acceleration
none of these
31. 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
32. 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
33. A force acting in the opposite direction to the motion of the body is called force of friction.
Agree
Disagree
34. If the gravitational acceleration of any place is doubled, then the weight of a body will be-
g/2
g
2g
√2g
35. The force, by which the body is attracted towards the center of the earth, is called-
impulsive force
momentum
weight
mass
36. The coefficient of restitution for inelastic bodies is-
zero
between 0 & 1
one
more than one
37. The matter contained in a body, is called-
impulsive force
momentum
weight
mass
38. 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
39. The total motion possessed by a body, is called
impulsive force
momentum
weight
mass
40. A redundant frame is also called- frame.
imperfect
deficient
perfect