MCQ on Strength of material Part 1 for JE exam
1). The poisson’s ratio for most of the materials is close to-
(a) 1:2
(b) 1:3
(c) 1:4
(d) 1:5
2). True stress represents the ratio of-
(a) Average load and average area
(b) Average load and maximum area
(c) Maximum load and maximum area
(d) Instantaneous load and instantaneous area
3). For which material the poisson’s ratio is more than unity?
A. steel
B. copper
C. aluminium
D. cast iron
(a) Only A
(b) Only B
(c) Only C
(d) None of these
4). The materials which exhibit the same elastic properties in all directions are
called
(a) Homogenous
(b) Inelastic
(c) Isotropic
(d) isentropic
5). Poisson’s ratio is defined as the ratio of
(a) Longitudinal stress and longitudinal strain
(b) Longitudinal stress and lateral stress
(c) lateral strain and longitudinal strain
(d) Lateral stress and lateral strain
6). Tensile strength of a material is obtained by dividing the maximum
load during the test by the
(a) Area at the time of fracture
(b) Original cross – sectional area
(c) The time of fracture and original cross-sectional area
(d) Minimum area after fracture
7). Precentage reductions of area in performing tensile test on cast
iron may be of the order of
(a) 50%
(b) 25%
(c) 0%
(d) 15%
8). In a tensile test on mild steel specimen , the breaking stress as
compared to ultimate tensile stress is
(a) More
(b) Less
(c) Same
(d) More/less depending on composition
9). The property of the material to regain its original shape after
deformation when the external forces are removed is
(a) Plasticity
(b) Elasticity
(c) Durability
(d) None of these
10). A rod of dimension 20mm *20mm is carrying an axial tensile
load of 10 KN. The tensile stress developed is-
(a) 0.025 MPa
(b) 0.25 MPa
(c) 25 MPa
(d) 250 MPa
11). Which of the following is CORRECT option for validation of Hook’s low
in simple tension test ?
(a) Ultimate stress
(b) Breaking point
(c) Elastic limit
(d) Limit of proportionality
12). Which of the following statements is CORRECT for the modulus of
resilience?
(a) It is the ratio of maximum stress energy and unit volume
(b) It is the ratio of maximum strain energy and unit volume
(c) It is the ratio of proof resilience and unit volume
(d) It is the ratio of proof resilience and unit area
13). To which of the following is the proof stress related?
(a) Elongation
(b) Necking
(c) Yielding
(d) fracture
14). There is_______ for a brittle material
(a) No elastic zone
(b) No plastic zone
(c) Large elastic zone
(d) Large plastic zone
15). The ability of a body to absorb energy and to deform plastically without
fracturing is known as-
(a) Creep
(b) Elasticity
(c) Plasticity
(d) toughness
16). Choose the CORRECT material which belongs to the category of highly
elastic?
(a) Brass
(b) Steel
(c) Glass
(d) Rubber
17). A solid can resist which of the following stress ?
(a) Tensile
(b) Compressive
(c) Shear
(d) All of these
18). Which of the following is a dimensionless quantity?
(a) Shear stress
(b) bulk modulus
(c) Poisson’s ratio
(d) Shear modulus
19). Percentage elongation during tensile test is indicative of
(a) Creep
(b) Malleability
(c) Ductility
(d) Elasticity in the metal
20). On the application of a given load, the length of a wire is stated to
increases by 1 mm. If the same force is now applied to wire of same material
but of the length and radius twice the first , the extension produced would be
(a) 0.25mm
(b) 0.5mm
(c) 2.0mm
(d) 4.0mm
21). Consider a bar of length l and tapering uniformly from diameter d2 to d1
and subjected to axial load W. the extension of the bar will be
(a) 4Wl/Ï€d1d2E
(b) 4WEl/Ï€d1d2
(c) πWEl/4d1d2
(d) πWl/4d1d2E
22). Poisson’s ratio is used in:
(a) One dimensional body
(b) Two dimensional body
(c) Three dimensional
(d) Both two and three dimensional body
23). When a wire is stretched to double in length, the longitudinal strain
produced in it is :
(a) 0.5
(b) 1.0
(c) 1.5
(d) 2.0
24). If equal and opposite forces applied to a body tend to elongate it, the
stress so produced is called
(a) Internal resistance
(b) Tensile stress
(c) Tranverse stress
(d) Compressive stress
25). The deformation per unit length in the direction of the force is known as
(a) Linear stress
(b) Shear stress
(c) Linear strain
(d) Lateral strain
26). Which material has the highest value of poisson’s ratio ?
(a) Rubber
(b) Copper
(c) Steel
(d) concrete
27). In a tensile test of a specimen, the ratio of maximum load to the original
cross-sectional area of the test piece is called
(a) Ultimate stress
(b) Sea stress
(c) Breaking stress
(d) Yield stress
28). The value of poisson’s ratio is always less than-
(a) 1
(b) 0.2
(c) 0.4
(d) 0.5
29). For a material with poisson’s ratio 0.25, the ratio of modulus of rigidity to
modulus of elasticity
(a) 0.4
(b) 1.2
(c) 2.0
(d) 3.6
30). Modulus of rigidity is the ratio of:
(a) Axial stress to lateral strain
(b) Liner stress to longitudinal strain
(c) Shear stress to shear strain
(d) Hydrostatic stress to volumetric strain
31).The elastic constants E,G and K are related by the expression:
(a) E= GK/(K +G)
(b) E= GK/(2K +G)
(c) E= 3GK/(K +2G)
(d) E= 9KG/(3K +G)
32).A cylindrical rod of length ‘l’ and diameter ‘d’ is rigidly fixed at its upper
end and hangs vertically. The elongation produced in rod due to its self weight
‘W’ is
(a) Wl/AE
(b) Wl/2AE
(c) 2AE/Wl
(d) 3Wl/2AE
33).A load of 20000 kg applied to a brass cylinder 40 cm long and 10 cm in
diameter caused the length to increase 0.8 cm and the diameter to decrease
0.005 cm. Poisson’s ratio of brass is
(a) 0.025
(b) 0.925
(c) 0.25
(d) 2.5
34).The stress produced by a suddenly applied load as compared to that
produced by the same load when applied gradually is______ times
(a) 1.5
(b) 2
(c) 3
(d) 4
35).During a tensile test on a specimen of 1 cm2 cross-section, maximum load
observed was 8 tonnes and area of cross-section at neck was 0.5 cm2. Ultimate
tensile strength of specimen is
(a) 4 tonnes/cm2
(b) 8 tonnes/cm2
(c) 16 tonnes/cm2
(d) 22 tonnes/cm2