**76. In a three hinged arch, the linear and the actual arch meet at**

a) at least three points

b) at least two points

c) all points irrespective of loading

d) nowhere

**Ans: a**

**77. If a three hinged parabolic arch carries a uniformly distributed load over the entire span, then any section of the arch is subjected to**

a) normal thrust only

b) normal thrust and shear force

c) normal thrust and bending moment

d) normal thrust, shear force and bending moment

**Ans: a**

**78. Three hinged arch is**

a) statically indeterminate by one degree

b) statically indeterminate by two degrees

c) statically determinate

d) unstable structure

**Ans: c**

**79. A linear arch has**

a) normal thrust only

b) shear force only

c) bending moment only

d) normal thrust and shear force

**Ans: a**

**80. A three hinged arch is carrying uniformly distributed load over the entire span. The arch is free from shear force and bending moment if its shape is**

a) circular

b) parabolic

c) elliptical

d) none of the above

**Ans: b**

**81. For a determinate pin-jointed plane frame, the relation between the number of joints j and members m is given by**

a) m = 2j – 3

b) m = 3j-6

c) m > 2j – 3

d) m > 3j – 6

**Ans: a**

**82. The basic perfect frame is a**

a) triangle

b) rectangle

c) square

d) hexagon

**Ans: a**

**83. Method of joints is applicable only when the number of unknown forces at the joint under consideration is not more than**

a) one

b) two

c) three

d) four

**Ans: b**

**84. A short column of external diameter of 250 mm and internal diameter of 150 mm carries an eccentric load of 1000 kN. The greatest eccentricity which the load can have without producing tension anywhere is**

a) 20 mm

b) 31.25 mm

c) 37.5 mm

d) 42.5 mm

**Ans: d**

**85. Proof resilience is the maximum energy stored at**

a) limit of proportionality

b) elastic limit

c) plastic limit

d) none of the above

**Ans: b**

**86. Strain energy stored in a member is given by**

a) 0.5 x stress x volume

b) 0.5 x strain x volume

c) 0.5 x stress x strain x volume

d) 0.5 x stress x strain

**Ans: c**

**87. A rectangular block of size 200 mm x 100 mm x 50 mm is subjected to a shear stress of 100 N/mm2. If modulus of rigidity of material is 1 x 105 N/mm2, strain energy stored will be**

a) 10 N.m

b) 25 N.m

c) 50 N.m

d) 100N.m

**Ans: c**

**88. A steel rod of cross sectional area equal to 1000 mm2 is 5 m long. If a pull of 100 kN is suddenly applied to it, then the maximum stress intensity will be**

a) 50 N/mm2

b) 100 N/mm2

c) 200 N/mm2

d) 400 N/mm2

**Ans: c**

**89. If the depth of a beam of rectangular section is reduced to half, strain energy stored in the beam becomes**

a) 1/4 time

b) 1/8 time

c) 4 times

d) 8 times

**Ans: d**

**90. The specimen in a Charpy impact test is supported as a**

a) cantilever beam

b) simply supported beam

c) fixed beam

d) continuous beam

**Ans: b**

**91. Impact test enables one to estimate the property of**

a) hardness

b) toughness

c) strength

d) creep

**Ans: b**

**92. The phenomenon of decreased resistance of a material to reversal of stress is called**

a) creep

b) fatigue

c) resilience

d) plasticity

**Ans: d**

**93. The property of metal which allows it to deform continuously at slow rate without any further increase in stress is known as**

a) fatigue

b) creep

c) plasticity

d) resilience

**Ans: b**

**94. The stress below which a material has a high probability of not failing under reversal of stress is known as**

a) tolerance limit

b) elastic limit

c) proportional limit

d) endurance limit

**Ans: b**

**95. A three hinged parabolic arch rib is acted upon by a single load at the left quarter point. If the central rise is increased and the shape of arch altered to segmental without changing the other details, the horizontal thrust will**

a) increase definitely

b) decrease definitely

c) be difficult to predict

d) increase or decrease depending upon the radius of the segmental arch

**Ans: b**

**96. For ductile materials, the most appropriate failure theory is**

a) maximum shear stress theory

b) maximum principal stress theory

c) maximum principal strain theory

d) shear strain energy theory

**Ans: a**

**97. At a point in a steel member, the major principal stress is 2000 kg/cm2 and the minor principal stress is compressive. If the uni-axial tensile yield stress is 2500 kg/cm2, then the magnitude of the minor principal stress at which yielding will commence, according to the maximum shearing stress theory, is**

a) 1000 kg/cm2

b) 2000 kg/cm2

c) 2500 kg/cm2

d) 500 kg/cm2

**Ans: d**

**98. For the design of a cast iron member, the most appropriate theory of failure is**

a) Mohr’s theory

b) Rankine’s theory

c) Maximum strain theory

d) Maximum shear energy theory

**Ans: b**

**99. A cantilever beam carries a uniformly distributed load from fixed end to the centre of the beam in the first case and a uniformly distributed load of same intensity from centre of the beam to the free end in the second case. The ratio of deflections in the two cases is**

a) 1/2

b) 3/11

c) 5/24

d) 7/41

**Ans: d**

**100. The sum of normal stresses is**

a) constant

b) variable

c) dependent on the planes

d) none of the above

**Ans: a**