1) Stress is defined as ___ a) force per unit area b) resistance per unit area c) force per unit length d) resistance per unit length 2) The S.I. unit of stress is ___ a) Kg.cm b) Kg/cm c) Kg/cm2 d) N/m2 3) The resistance to deformation of a body per unit area is called ___ a) Strain b) Stress c) Modulus of elasticity d) Modulus of rigidity 4) 1 MPa = ___ a) 1 N/m2 b) 1 N/mm2 c) 1 kN/m2 d) 1 kN/mm2 5) The ratio of change in dimension to the original dimension is called ___ a) stress b) strain c) modulus of elasticity d) bulk modulus 6) Units of strain are ___ a) mm/N b) N/m2 c) N/mm d) No units 7) If a change in length takes place in the direction of force, the strain is known as ___ a) linear (tensile) strain b) laterial strain c) volumetric strain d) shear strain 8) When a body is subjected to two equal and opposite pushes, as a result of which the body tend to reduce its length. The stress developed in the body will be ___ a) tensile stress b) compressive stress c) shear stress d) bending stress 9) The unit of elastic modulus is same as that of ___ a) stress, shear modulus & pressure b) strain, shear modulus & force c) shear modulus, stress & force d) stress, strain & pressure 10) When a force is applied tangentially to a surface, then stress developed in the body is called ___ a) normal stress b) shear stress c) tensile stress d) compressive stress 11) If a shaft of diameter 'D' and length 'L' has been loaded axially, then the ratio of change in diameter to the original diameter (d/D) is called ___ a) longitudinal strain b) shear strain c) lateral strain d) volumetric strain 12) When a body is subjected to some external forces, it undergoes change in ___ which is known as deformation. a) shape only b) size only c) size and shape d) weight 13) Young's modulus may be defined as a ratio of ___ a) linear (tensile) stress to lateral strain b) lateral strain to linear (tensile) strain c) linear (tensile) stress to linear (tensile) strain d) shear stress to shear strain 14) Hooke's law holds good up to ___ a) Proportional (elastic) limit b) Yield Point c) Breaking Point d) Plastic limit 15) Poisson's ratio always lies between ___ a) -1 to 0.5 b) -1 to +1 c) 0 to 0.5 d) None of these 16) The point in stress-strain curve at which the material begins to flow (like plastic flow) is called ___ a) elastic limit b) proportional limit c) yield point d) breaking point 17) Which of the following substance is not elastic? a) Iron b) Brass c) Copper d) Modeling clay 18) Which of the following substance is not plastic? a) Butter b) Iron c) Polythene bag d) Wax 19) The strain produced in a spring when a weight is attached to spring balance is ___ a) elastic strain b) linear (tensile) strain c) volumetric strain d) shear strain 20) According to Hooke's law, if stress is increased, the ratio of stress to strain ___ a) increases b) decreases c) becomes zero d) remains constant 21) For an incompressible liquid, the bulk modulus is ___ a) zero b) constant c) a small number d) infinity 22) The change in dimension of a body is known as ___ a) deformation b) formation c) conformation d) contraction 23) Which of the following factors affect elasticity? a) hammering and rolling b) annealing c) temperature d) all of these 24) Which of the following are the example of plastic body? a) dough b) gum c) clay d) all of these 25) Which of the following have highest elasticity? a) steel b) copper c) rubber d) aluminium 26) Three copper wires A, B and C of the same length are progressively loaded. Their load v/s extension graphs within elastic limit are shown in the figure. Which wire has minimum cross-sectional area?   a) Wire C b) Wire B c) Wire A d) All have equal cross-sectional area 27) The spring is made up of steel and not of copper because ___ a) it is conventional b) steel is cheaper than copper c) steel is less elastic than copper d) steel is more elastic than copper 28) Write: glass, rubber, steel, copper in order of increasing elasticity. a) copper, glass rubber, steel b) steel, glass, copper, rubber c) rubber, glass, copper, steel d) steel, copper, glass, rubber 29) The force which produces deformation in the body is called ___ a) deforming force b) restoring force c) centripetal force d) none of these 30) The dimensional formula of stress is ___ a) [ M1 L-1 T-2 ] b) [ M1 L-2 T-1 ] c) [ M-2 L1 T-1 ] d) [ M-2 L-1 T1 ] 31) The tensile stress is a stress related to change in ___ a) shape of the body b) size of the body c) length of the body d) all of these 32) The elastic limit is the maximum stress up to which a body can be subjected ___ a) with permanent deformation b) without permanent deformation c) without partial deformation d) with partial deformation 33) "Within elastic limit stress is directly proportional to strain produced in the body" is the ___ a) statement of Kepler's law b) statement of Newton's law c) statement of Hooke's law d) statement of Einstein's law 34) Bulk modulus of perfectly rigid body is ___ a) zero b) finite c) infinity d) unity 35) Shear strain is expressed by ___ a) angle of twist b) angle of shear c) decrease in volume d) increase in volume

1.1) Elasticity - Quiz 2 (35 M)

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