Strength of Materials Quiz | Strength of Materials MCQs and Answers

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Questions
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
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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

Answer: repose
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

Answer: second 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

Answer: 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

Answer: double
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

Answer: 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

Answer: wattr
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

Answer: hyperbola
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

Answer: 50
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

Answer: 62.5 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

Answer: 2/-3
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

Answer: non-equilibrium
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
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