Download PDF
Free download in PDF Strength of Materials MCQs and Answers for competitive exams. These short objective type questions with answers are very important for Board exams as well as competitive exams. These short solved questions or quizzes are provided by Gkseries.
81
In actual machines
[A]
mechanical advantage is greater than velocity ratio
[B]
mechanical advantage is equal to velocity ratio
[C]
mechanical advantage is less than velocity ratio
[D]
mechanical advantage is unity
Answer: mechanical advantage is less than velocity ratio
82
In ideal machines
[A]
mechanical advantage is greater than velocity ratio
[B]
mechanical advantage is equal to velocity ratio
[C]
mechanical advantage is less than velocity ratio
[D]
mechanical advantage is unity
Answer: mechanical advantage is equal to velocity ratio
83
The angle which an inclined plane makes with the horizontal when a body placed on it is about to move down is known as angle of
[A]
friction
[B]
limiting friction
[C]
repose
[D]
kinematic friction
84
In the lever of third order, load W, effort P and fulcrum F are oriented as follows
[A]
W between P and F
[B]
F between W and P
[C]
P between W and F
[D]
W, P and F all on one side
Answer: W between P and F
85
A pair of smith’s tongs is an example of the lever of
[A]
zeioth order
[B]
first order
[C]
second order
[D]
third order
86
Which of the following is the example of lever of first order
[A]
arm of man
[B]
pair of scissors
[C]
pair of clinical tongs
[D]
all of the above
87
The M.I. of hollow circular section about a central axis perpendicular to section as compared to its M.I. about horizontal axis is
[A]
same
[B]
double
[C]
half
[D]
four times
88
The C.G. of a right circular solid cone of height h lies at the following distance from the base
[A]
h/2
[B]
J/3
[C]
h/6
[D]
h/4
89
The C.G. of a plane lamina will not be at its geometrical centre in the case of a
[A]
right angled triangle
[B]
equilateral triangle
[C]
square
[D]
circle
Answer: right angled triangle
90
The C.G. of a solid hemisphere lies on the central radius 3r
[A]
at distance — from the plane base 3r
[B]
at distance — from the plane base 3r
[C]
at distance — from the plane base 3r
[D]
at distance — from the plane base or
Answer: at distance — from the plane base or
91
A sample of metal weighs 219 gms in air, 180 gms in water, 120 gms in an unknown fluid. Then which is correct statement about density of metal
[A]
density of metal can’t be determined
[B]
metal is twice as dense as water
[C]
metal will float in water
[D]
metal is twice as dense as unknown fluid
Answer: density of metal can’t be determined
92
Which of the following is not the unit of energy
[A]
kg m
[B]
kcal
[C]
wattr
[D]
watt hours
93
Which of the following is the locus of a point that moves in such a manner that its distance from a fixed point is equal to its distance from a fixed line multiplied by a constant greater than one
[A]
ellipse
[B]
hyperbola
[C]
parabola
[D]
circle
94
A flywheel on a motor goes from rest to 1000 rpm in 6 sec. The number of revolutions made is nearly equal to
[A]
25
[B]
50
[C]
100
[D]
250
95
A body moves, from rest with a constant acceleration of 5 m per sec. The distance covered in 5 sec is most nearly
[A]
38 m
[B]
62.5 m
[C]
96 m
[D]
124 m
96
If n = number of members andy = number of joints, then for a perfect frame, n =
[A]
j-2
[B]
2j-l
[C]
2/-3
[D]
3/-2
97
If three forces acting in different planes can be represented by a triangle, these will be in
[A]
non-equilibrium
[B]
partial equilibrium
[C]
full equilibrium
[D]
unpredictable
98
The necessary condition for forces to be in equilibrium is that these should be
[A]
coplanar
[B]
meet at one point ;
[C]
both (a) and (b) above
[D]
all be equal
Answer: both (a) and (b) above
99
The co-efficient of friction depends upon
[A]
nature of surfaces
[B]
area of contact
[C]
shape of the surfaces
[D]
ail of the above.
Answer: nature of surfaces
100
The maximum frictional force which comes into play when a body just begins to slide over another surface is called
[A]
limiting friction
[B]
sliding friction
[C]
rolling friction
[D]
kinematic friction
Answer: limiting friction
Take Mock Tests