Q1.The property of material by which it can be drawn into smaller section by application of tension is called
(A) plasticity
(B) ductility
(C) elasticity
(D) malleability
View Answer
Answer is B.
Q
2. Every material obey Hooks law within its
(A)Elastic Limit
B)Plastic Limit
(C)Limit of Proportionality
(D) None of these
View Answer
Answer is C.
Beyond the proportionality limit, the material doesn’t obey the Hooks law. Beyond the elastic limit, permanent deformation occur occurs that is, the material doesn’t go back to its original position once the load is removed.
Q3. If a uniform bar is supported at one end in a vertical direction loaded at the bottom end by a load equal to the weight of the bar, the strain energy as compared to that due to self weight will be.
(A) same
(B) half
(C) twice
(D) thrice
View Answer
Answer is D.
Use strain energy concepts to solve this problem.
Q4. The ratio between stress and strain is called as.
(A) modulus of elasticity
(B) modulus of rigidity
(C) bulk modulus
(D) None of these
View Answer
Answer is A
Modulus of rigidity is the ratio of share stress to share strain. Bulk modulus is the ratio of volumetric stress to volumetric strain.
Q4. The relation between modulus of elasticity, capital E and share modulus N is given by
(A) E =N(1-2£)
(B) E=2N(1+£)
(C) E=3N (1-2£)
(D) None of the above
View Answer
Answer is B
Q5.The percentage of elongation of test piece under tension indicates
(A) brittleness
(B)malleability
(C) stiffness
(D) ductility
View Answer
Answer is D.
Ductility is the property of material by which it can undergo long deformation before yielding occurs. Hence, percentage elongation under tension indicates ductility.
Q6.The limit of poissons ratio is.
(A) 0.25
(B) 0.15
(C) 0.50
(D) 0.65
View Answer
Answer is C.
The limit of poissons ratio is 0.5, which occurs for an incompressible material.
Q7.The ductility of which of the following is maximum?
(A) mild steel
(B) cast iron
(C)wrought iron
(D) pig iron
View Answer
Answer is A
Q8.Strain, energy stored in a solid given as:
(a) σχεx volume
(b) σχεx area of cross section
(c) 0.5sigma*epsilon*I
(d) 0.5 χσχε x volume
View Answer
Answer is D.
Use strain energy formula.
Q9.The ratio of normal stress to volumetric strain in defined as
(a) Young’s modulus
(b) Bulk modulus
(c) Rigidity modulus
(d) Tangent modulus
View Answer
Answer is B
Young’s modulus = Tensile stress /Tensile strain
Rigidity modulus = Shear stress/ Shear strain ,
Tangent modulus = Slope of the stress-strain curve at any specified stress or strain.
Q10. Modulus of rigidity is expressed as
(a) compressive stress/compressive strain
(b) tensile stress/tensile strain
(c) shear stress/shear strain
(d) stress/volumetric strain
View Answer
Answer is C
The shear modulus is concerned with the deformation of a solid when it experiences a force parallel to one of its surfaces while its opposite face experiences an opposing force (such as friction.)
Q11.Hooke’s law is valid up to
(a) Limit of proportionality
(b) Ultimate point
(c) Elastic limit
(d) Yield point
View Answer
Answer is A
Limit of proportionality
Q12.The ability of a material to absorb energy till the elastic limit is known as
(a) Resilience
(b) Ductility
(c) Elasticity
(d) Malleability
View Answer
Answer is A
Q13.Out of the following, which is least elastic ?
(a) Silver
(b) Rubber
(c) Iron
(d) Copper
View Answer
Answer is B
Elasticity is measured as ratio of stress to strain For a given stress, strain is much smaller in steel than in rubber.
Q14.A bar, L metre long and having its area of cross- section A, is subjected to gradually applied tensile load W. The strain energy stored in the bar is given by
(a) (W ^ 2 * L)/(AE)
(b) (W ^ 2 * L)/(2AE)
(c) (WL)/(2AE)
(d) (WL)/(AE)
View Answer
Answer is B
Q15.The predominant effect of an axial tensile force on a helical spring is
(a) Compression
(b) Twisting
(c) Bending
(d) Tension
View Answer
Answer is B
A spring may be defined as an elastic member whose primary function is to deflect or distort under the action of applied load and it recovers its original shape when load is released. A helical spring is made of wire coiled into a helical form, the load being applied along the axis of the helix. In these type of springs the major stresses are torsional shear stress due to twisting. They are both used in tension and compression.
Q16.For a beam carrying a uniformly distributed load. the strain energy will be maximum in case the beam is
(a) Propped cantilever
(b) Fixed at both ends
(c) Cantilever
(d) Simply supported
View Answer
Answer is C
Q17.From a circular plate of diameter 6.0 cm, a circle is cut out whose diameter is a radius of the plate. The distance of centre fo gravity of the remainder from the centre of circular plate is
(a) 5.0 cm
(b) 1.5cm
(c) 1.0cm
(d) 0.5 cm
View Answer
Answer is D
Q18.The ability of a material to absorb energy till the breaking or rupture takes place is known as
(a) Hardness
(b) Toughness
(c) Brittleness
(d) Softness
View Answer
Answer is B
Hardness: It is the ability of a material to resist indentation or surface abrasion. Brittleness: It is lack of ductility Brittleness implies that it cannot be drawn out by tension to smaller section. Softness: Higher the softness, lesser is the force required to make a scratch in the material
Q19.A linear force-deformation relation is obtained in materials
(a) having elastic stress-strain property
(b) having plastic stress-strain property
(c) following Hooke’s law
(d) which are rigid elastic materials
View Answer
Answer is C
Hooke’s law is valid for material having linear stress and strain relationship.
Q20.Total number of elastic isotropic material are
(a) 2
(b) 3
(c) 4
(d) 5
View Answer
Answer is A
An elastic isotropic material has two elastic constants, Young’s modulus and Poisson’s ratio
Q21.One cubic metre of mild steel weighs about
(a) 1000 kg
(b) 3625 kg
(c) 7850 kg
(d) 12560 kg
View Answer
Answer is C
The density of mild steel is 7.85 g/cm³ or 7850 kg/m³.
Q22.In Brinell Hardness test, the type of indentor used is
(a) hard steel ball
(b) diamond cone
(c) mild steel ball
(d) hard steel cone
View Answer
Answer is A
In the Brinell Hardness test the indenter is a hardened steel ball which is pressed into the surface using a known standard load. The diameter of resulting indentation is than measured using a microscope & scale.
Q23.Percentage increase of carbon in steel, decreases its
(a) hardness
(b) ductility
(c) strength
(d) brittleness
View Answer
Answer is B
Q23.Which of the following materials is expected to have the least value of Young’s modulus of elasticity?
(a) Wood
(b) Copper
(c) Glass
(d) Aluminium
View Answer
Answer is A
Q24.The weight of 10 mm diameter mild steel rod per metre length is equal to
(a) 0.22 kg
(b) 0.32 kg
(c) 0.42 kg
(d) 0.62 kg
View Answer
Answer is D
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View Answer
Answer is