Exam (elaborations)
Chapter Nine MECHANICAL PROPERTIES OF SOLIDS
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Chapter Nine MECHANICAL PROPERTIES OF SOLIDS
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Chapter NineMECHANICAL
PROPERTIES OF
SOLIDS
MCQ I
9.1 Modulus of rigidity of ideal liquids is
(a) infinity.
(b) zero.
(c) unity.
(d) some finite small non-zero constant value.
9.2 The maximum load a wire can withstand without breaking, when
its length is reduced to half of its original length, will
(a) be double.
(b) be half.
(c) be four times.
(d) remain same.
9.3 The temperature of a wire is doubled. The Young’s modulus of
elasticity
(a) will also double.
(b) will become four times.
20/04/2018
, Exemplar Problems–Physics
( c ) will remain same.
(d) will decrease.
9.4 A spring is stretched by applying a load to its free end. The strain
produced in the spring is
(a) volumetric.
(b) shear.
(c) longitudinal and shear.
(d) longitudinal.
9.5 A rigid bar of mass M is supported symmetrically by three wires
each of length l . Those at each end are of copper and the middle
one is of iron. The ratio of their diameters, if each is to have the
same tension, is equal to
(a) Ycopper/Yiron
Yiron
(b)
Ycopper
2
Y iron
(c) 2
Y copper
(d) Yiron .
Ycopper
9.6 A mild steel wire of length 2L and cross-sectional area A is
stretched, well within elastic limit, horizontally between two pillars
(Fig. 9.1). A mass m is suspended from the mid point of the wire.
Strain in the wire is
2L
x
m
Fig. 9.1
x2
(a)
2 L2
x
(b)
L
66
20/04/2018
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