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1. Strain is defined as the ratio of

(a) change in volume to original volume

(b) change in length to original length

(c) change in cross-sectional area to original cross-sectional area

(d) any one of the above

(e) none of the above.

Ans: d

2. Hookes la! holds good u"to

(a) yield "oint

(b) limit of "ro"ortionality

(c) breaking "oint

(d) elastic limit (e) "lastic limit.

Ans: b

#. $oungs modulus is defined as the ratio of

(a) volumetric stress and volumetric strain

(b) lateral stress and lateral strain

(c) longitudinal stress and longitudinal strain

(d) shear stress to shear strain

(e) longitudinal stress and lateral strain.

Ans: c

%. &he unit of $oungs modulus is

(a) mm'mm

(b) kg'cm

(c) kg

(d) kg'cm2

(e) kg cm2.

Ans: d

. eformation "er unit length in the direction of force is kno!n as



(a) strain

(b) lateral strain

(c) linear strain

(d) linear stress

(e) unit strain.

Ans: c

*. +t e,ual and o""osite forces a""lied to a body tend to elongate it the stress so "roduced is called

(a) internal resistance

(b) tensile stress

(c) transverse stress

(d) com"ressive stress

(e) !orking stress.

Ans: b

. &he materials having same elastic "ro"erties in all directions are called

(a) ideal materials

(b) uniform materials

(c) isotro"ic materials

(d) "ractical materials

(e) elastic materials.

Ans: c

/. A thin mild steel !ire is loaded by adding loads in e,ual increments till it breaks. &he e0tensions

noted !ith increasing loads !ill behave as under

(a) uniform throughout

(b) increase uniformly

(c) first increase and then decrease

(d) increase uniformly first and then in-crease ra"idly

(e) increase ra"idly first and then uniformly.

Ans: d

. odulus of rigidity is defined as the ratio of

(a) longitudinal stress and longitudinal strain

(b) volumetric stress and volumetric strain



(c) lateral stress and lateral strain

(d) shear stress and shear strain

(e) linear stress and lateral strain.

Ans: d

13. +f the radius of !ire stretched by a load is doubled then its $oungs modulus !ill be

(a) doubled

(b) halved

(c) become four times

(d) become one-fourth

(e) remain unaffected.

Ans: e

11. &he ultimate tensile stress of mild steel com"ared to ultimate com"ressive stress is (a) same

(b) more

(c) less

(d) more or less de"ending on other factors

(e) un"redictable.

Ans: b

12. &ensile strength of a material is obtained by dividing the ma0imum load during the test by the

(a) area at the time of fracture

(b) original cross-sectional area

(c) average of (a) and (b)

(d) minimum area after fracture


Ans: b

1#. &he im"act strength of a material is an inde0 of its

(a) toughness

(b) tensile strength

(c) ca"ability of being cold !orked

(d) hardness

(e) fatigue strength.

Ans: a



1%. &he $oungs modulus of a !ire is defined as the stress !hich !ill increase the length of !ire

com"ared to its original length

(a) half

(b) same amount

(c) double

(d) one-fourth

(e) four times.

Ans: b

1. 4ercentage reduction of area in "erforming tensile test on cast iron may be of the order of

(a) 35

(b) 25

(c) 35

(d) 15 (e) *35.

Ans: c

1*. &he intensity of stress !hich causes unit strain is called

(a) unit stress

(b) bulk modulus

(c) modulus of rigidity

(d) modulus of elasticity

(e) "rinci"al stress.

Ans: d

1. &rue stress-strain curve for materials is "lotted bet!een

(a) load'original cross-sectional area and change in length'original length

(b) load'instantaneous cross-sectional area original area and log.

(c) load'instantaneous cross-sectional area and change in length'original length

(d) load'instantaneous area and instantaneous area'original area


Ans: b

1/. uring a tensile test on a s"ecimen of 1 cm cross-section ma0imum load observed !as / tonnes

and area of cross-section at neck !as 3. cm2. 6ltimate tensile strength of s"ecimen is

(a) % tonnes'cm2

(b) / tonnes'cm2



(c) 1* tonnes'cm2

(d) 22 tonnes'cm2


Ans: b

1. 7or steel the ultimate strength in shear as com"ared to in tension is nearly

(a) same

(b) half

(c) one-third

(d) t!o-third

(e) one-fourth.

Ans: b

23. 8hich of the follo!ing has no unit (a) kinematic viscosity

(b) surface tension

(c) bulk modulus

(d) strain

(e) elasticity.

Ans: d

21. 8hich is the false statement about true stress-strain method

(a) +t does not e0ist

(b) +t is more sensitive to changes in both metallurgical and mechanical conditions

(c) +t gives a more accurate "icture of the ductility

(d) +t can be correlated !ith stress-strain values in other tests like torsion im"act combined stress

tests etc.

(e) +t can be used for com"ression tests as !ell.

Ans: a

22. +n a tensile test on mild steel s"ecimen the breaking stress as com"ared to ultimate tensile

stress is

(a) more

(b) less

(c) same

(d) more'less de"ending on com"osition

(e) may have any value.



Ans: b

2#. +f a "art is constrained to move and heated it !ill develo"

(a) "rinci"al stress

(b) tensile stress

(c) com"ressive stress

(d) shear stress

(e) no stress.

Ans: c

2%. 8hich of the follo!ing materials is most elastic

(a) rubber

(b) "lastic

(c) brass(d) steel

(e) glass.

Ans: d

2. &he value of modulus of elasticity for mild steel is of the order of

(a) 2.10l3 kg'cm2

(b) 2.1 9 13* kg'cm2

(c) 2.1 0 13 kg'cm2

(d) 3.1 0l* kg'cm2 (;<) #./ 0 13* kg'cm2.

Ans: b

2*. &he value of 4oissons ratio for steel is bet!een

(a) 3.31 to 3.1

(b) 3.2# to 3.2

(c) 3.2 to 3.##

(d) 3.% to 3.*

(e) # to %.

Ans: c

2. &he buckling load for a given material de"ends on

(a) slenderness ratio and area of cross-section

(b) 4oissons ratio and modulus of elasticity

(c) slenderness ratio and modulus of elasticity



(d) slenderness ratio area of cross-section and modulus of elasticity

(e) 4oissons ratio and slenderness ratio.

Ans: d

2/. &he total elongation "roduced in a bar of uniform section hanging vertically do!n!ards due to

its o!n !eight is e,ual to that "roduced by a !eight

(a) of same magnitude as that of bar and a""lied at the lo!er end

(b) half the !eight of bar a""lied at lo!er end

(c) half of the s,uare of !eight of bar a""lied at lo!er end

(d) one-fourth of !eight of bar a""lied at lo!er end


Ans: b

2. &he "ro"erty of a material by virtue of !hich a body returns to its original sha"e after removalof the load is called

(a) "lasticity

(b) elasticity

(c) ductility

(d) malleability

(e) resilience.

Ans: b

#3. &he materials !hich e0hibit the same elastic "ro"erties in all directions are called

(a) homogeneous

(b) inelastic

(c) isotro"ic

(d) isotro"ic

(e) relativistic.

Ans: c

#1. &he value of 4oissons ratio for cast iron is

(a) 3.1 to 3.2

(b) 3.2# to 3.2

(c) 3.2 to 3.##

(d) 3.% to 3.*

(e) # to %.

Ans: b



#2. &he "ro"erty of a material !hich allo!s it to be dra!n into a smaller section is called

(a) "lasticity

(b) ductility

(c) elasticity

(d) malleability

(e) durability.

Ans: b

##. 4oissons ratio is defined as the ratio of

(a) longitudinal stress and longitudinal strain

(b) longitudinal stress and lateral stress

(c) lateral stress and longitudinal stress

(d) lateral stress and lateral strain (e) none of the above.

Ans: c

#%. 7or !hich material the 4oissons ratio is more than unity

(a) steel

(b) co""er

(c) aluminum

(d) cast iron


Ans: e

#. &he "ro"erty of a material by virtue of !hich it can be beaten or rolled into "lates is called

(a) malleability

(b) ductility

(c) "lasticity

(d) elasticity

(e) reliability.

Ans: a

#*. &he change in the unit volume of a material under tension !ith increase in its 4oissons ratio

!ill

(a) increase

(b) decrease



(c) remain same

(d) increase initially and then decrease

(e) un"redictable.

Ans: b

#. &he "ercentage reduction in area of a cast iron s"ecimen during tensile test !ould be of the

order of

(a) more than 35

(b) 2=35

(c) 13=25

(d) =135

(e) negligible.

Ans: e

#/. +f a material e0"ands freely due to heating it !ill develo"

(a) thermal stresses

(b) tensile stress

(c) bending

(d) com"ressive stress

(e) no stress.

Ans: e

#. +n a tensile test near the elastic limit >one the

(a) tensile strain increases more ,uickly

(b) tensile strain decreases more ,uickly

(c) tensile strain increases in "ro"ortion to the stress

(d) tensile strain decreases in "ro"ortion to the stress

(e) tensile strain remains constant.

Ans: a

%3. &he stress necessary to initiate yielding is

(a) considerably greater than that necessary to continue it

(b) considerably lesser than that necessary to continue it

(c) greater than that necessary to sto" it

(d) lesser than that necessary to sto" it

(e) e,ual to that necessary to sto" it.

Ans: a


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%1. +n the tensile test the "henomenon of slo! e0tension of the material i. e. stress increasing !ith

the time at a constant load is called

(a) cree"ing

(b) yielding

(c) breaking

(d) "lasticity


Ans: a

%2. &he stress develo"ed in a material at breaking "oint in e0tension is called

(a) breaking stress

(b) fracture stress

(c) yield "oint stress (d) ultimate tensile stress

(e) "roof stress.

Ans: a

%#. ?u"ture stress is

(a) breaking stress

(b) ma0imum load'original cross-section@al area 3%)

(c) load at breaking "oint'A

(d) load at breaking "oint'neck area

(e) ma0imum stress.

Ans: d

%%. &he elasticity of various materials is controlled by its

(a) ultimate tensile stress

(b) "roof stress

(c) stress at yield "oint

(d) stress at elastic limit

(e) tensile stress.

Ans: d

%. &he ratio of lateral strain to the linear strain !ithin elastic limit is kno!n as

(a) $oungs modulus

(b) bulk modulus





(e) 4oissons ratio.

Ans: e

%*. &he ratio of direct stress to volumetric strain in case of a body subected to three mutually

"er"endicular stresses of e,ual intensity is e,ual to

(a) $oungs modulus

(b) bulk modulus



(e) 4oissons ratio.

Ans: b

%. &he stress at !hich e0tension of the material takes "lace more ,uickly as com@"ared to the

increase in load is called

(a) elastic "oint of the material

(b) "lastic "oint of the material

(c) breaking "oint of the material

(d) yielding "oint of the material

(e) ultimate "oint of the material.

Ans: d

%/. +n ,uestion * the internal reaction in bottom /3 cm length !ill be

(a) same in both cases

(b) >ero in first case

(c) different in both cases

(d) data are not sufficient to determine same


Ans: b

%. 7lo! stress corres"onds to

(a) fluids in motion

(b) breaking "oint

(c) "lastic deformation of solids

(d) ru"ture stress




Ans: c

3. 8hen it is indicated that a member is elastic it means that !hen force is a""lied it !ill

(a) not deform

(b) be safest

(c) stretch

(d) not stretch


Ans: c

1. &he energy absorbed in a body !hen it is strained !ithin the elastic limits is kno!n as

(a) strain energy

(b) resilience

(c) "roof resilience (d) modulus of resilience

(e) toughness..

Ans: a

2. ?esilience of a material is considered !hen it is subected to

(a) fre,uent heat treatment

(b) fatigue

(c) cree"

(d) shock loading

(e) resonant condition.

Ans: d

#. &he ma0imum strain energy that can be stored in a body is kno!n as

(a) im"act energy

(b) resilience

(c) "roof resilience

(d) modulus of resilience

(e) toughness.

Ans: c

%. &he total strain energy stored in a body is termed as

(a) resilience

(b) "roof resilience



(c) modulus of resilience

(d) toughness

(e) im"act energy.

Ans: a

. 4roof resilience "er material is kno!n as

(a) resilience

(b) "roof resilience

(c) modulus of resilience

(d) toughness

(e) im"act energy.

Ans: c

*. &he stress induced in a body due to suddenly a""lied load com"ared to !hen it is a""lied gradually is

(a) same

(b) half

(c) t!o times

(d) four times


Ans: c

. &he strain energy stored in a body due to suddenly a""lied load com"ared to !hen it is a""lied

gradually is

(a) same

(b) t!ice

(c) four times

(d) eight times

(e) half.

Ans: c

/. A material ca"able of absorbing large amount of energy before fracture is kno!n as

(a) ductility

(b) toughness

(c) resilience

(d) shock "roof

(e) "lasticity.



Ans: b

. Boa0ing is the method of increasing

(a) strength by reversible cycling

(b) corrosion resistance by s"raying

(c) hardness by surface treatment

(d) fatigue resistance by over-stressing the metal by successively increasing loadings

(e) cree" by head treatment.

Ans:

*3. A beam is loaded as cantilever. +f the load at the end is increased the failure !ill occur

(a) in the middle

(b) at the ti" belo! the load

(c) at the su""ort (d) any!here


Ans: d

*1. A non-yielding su""ort im"lies that the

(a) su""ort is frictionless

(b) su""ort can take any amount of reaction

(c) su""ort holds member firmly

(d) slo"e of the beam at the su""ort is >ero


Ans: d

*2. &he ratio of elongation in a "rismatic bar due to its o!n !eight (8) as com"ared to another

similar bar carrying an additional !eight (8) !ill be

(a) 1:2

(b) 1 : #

(c) 1 : %

(d) 1 : 2.

(e) 1 : 2.2.

Ans: b

*#. +n a "rismatic member made of t!o materials so oined that they deform e,ual@ly under a0ial

stress the unit stresses in t!o materials are



(a) e,ual

(b) "ro"ortional to their res"ective moduli of elasticity

(c) inversely "ro"ortional to their moduli of elasticity

(d) average of the sum of moduli of elasticity


Ans: b

*%. +n riveted boiler oints all stresses shearing bearing and tensile are based on the

(a) si>e of rivet

(b) si>e of the drilled or reamed hole

(c) average of si>e of rivet and hole

(d) smaller of the t!o

(e) any one of the above.

Ans: b

*. &he distance bet!een the centers of the rivets in adacent ro!s of >ig->ag riveted oint is

kno!n as

(a) "itch

(b) back "itch

(c) diagonal "itch

(d) diametral "itch

(e) la".

Ans: c

**. Cfficiency of a riveted oint is the ratio of its strength (ma0. load it can resist !ithout failure) to

the strength of the un"unished "late in

(a) tension

(b) com"ression

(c) bearing

(d) any one of the above


Ans: a

*. 8hen t!o "lates are butt together and riveted !ith cover "lates !ith t!o ro!s of rivets the

oiDit is kno!n as

(a) la" "oint

(b) butt oint



(c) single riveted single cover butt oint

(d) double riveted double cover butt oint

(e) single riveted double cover butt oint.

Ans: d

*/. A riveted oint in !hich every rivet of a ro! is o""osite to other rivet of the outer ro! is kno!n

as

(a) chain riveted oint

(b) diamond riveted oint

(c) cross-cross riveted oint

(d) >ig->ag riveted oint


Ans: a

*. A riveted oint in !hich the number otrivets decrease from innermost to outer most ro! is

called

(a) chain riveted oint

(b) diamond riveted oint

(c) cross-cross riveted oint

(d) >ig->ag riveted oint


Ans: b

3. +f the rivets in adacent ro!s are staggered and the outermost ro! has only one rivet the

arrangement of the rivets is called

(a) chain riveting

(b) >ig >ag riveting

(c) diamond riveting

(d) cross-cross riveting


Ans: c

1. iamond riveted oint can be ado"ted in the case of follo!ing ty"e of oint

(a) butt oint

(b) la" oint

(c) double riveted la" oints

(d) all ty"es of oints




Ans: a

2. ?ivets are made of follo!ing ty"e of material

(a) tough

(b) hard

(c) resilient

(d) ductile

(e) malleable.

Ans: d

#. &he !eakest section of a diamond riveting is the section !hich "asses through

(a) the first ro!

(b) the second ro! (c) the central ro!

(d) one rivet hole of the end ro!


Ans: d

%. &he deformation of a bar under its o!n !eight com"ared to the deformation of same body

subected to a direct load e,ual to !eight of the body is

(a) same

(b) double

(c) half

(d) four times

(e) one-fourth.

Ans: c

. &he force acting along the circumference !ill cause stress in the !alls in a direction normal to

the longitudinal a0is of cylinderD this stress is called

(a) longitudinal stress

(b) hoo" stress

(c) yeiled stress

(d) ultimate stress


Ans: b



*. A boiler shell 233 cm diameter and "late thickness 1. cm is subected to internal "ressure of

1. E'm then the hoo" stress !ill be

(a) #3 E'm2

(b) 3 E'm2

(c) 133 E'm2

(d) 233 E'm2

(e) #33 E'm2.

Ans: c

. A cylindrical section having no oint is kno!n as

(a) oint less section

(b) homogeneous section

(c) "erfect section

(d) manufactured section (e) seamless section.

Ans: e

/. Fongitudinal stress in a thin cylinder is

(a) e,ual to the hoo" stress

(b) t!ice the hoo" stress

(c) half of the hoo" stress

(d) one-fourth of hoo" stress

(e) four times the hoo" stress.

Ans: c

. &he safe t!isting moment for a com"ound shaft is e,ual to the

(a) ma0imum calculated value

(b) minimum calculated value

(c) mean value

(d) e0treme value


Ans: b

/3. &he torsional rigidity of a shaft is e0"ressed by the

(a) ma0imum tor,ue it can transmit

(b) number of cycles it undergoes before failure

(c) elastic limit u"to !hich it resists torsion shear and bending stresses



(d) tor,ue re,uired to "roduce a t!ist of one radian "er unit length of shaft

(e) ma0imum "o!er it can transmit at highest "ossible-s"eed.

Ans: d

/1. &he value of shear stress !hich is induced in the shaft due to the a""lied cou"le varies

(a) from ma0imum at the centre to >ero at the circumference

(b) from >ero at the centre to ma0imum at the circumference

(c) from ma0imum at the centre to mini-mum at the cricumference

(d) from minimum at the centre to ma0i-mum at the circumference


Ans: b

/2. A key is subected to side "ressure as !ell at shearing forces. &hese "ressures are called

(a) bearing stresses (b) fatigue stresses

(c) crushing stresses

(d) resultant stresses


Ans: a

/#. +n a belt drive the "ulley diameter is doubled the belt tension and "ulley !idth remaining

same. &he changes re,uired in key !ill be

(a) increase key length

(b) increase key de"th

(c) increase key !idth

(d) double all the dimensions


Ans: c

/%. Shear stress induced in a shaft subected to tension !ill be

(a) ma0imum at "eri"hery and >ero at center

(b) ma0imum at center

(c) uniform throughout

(d) average value in center


Ans: e

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Somgjhgjhjknknjbvgcddsawertyuiop;l.,mnbvcxdsertyuilkmnbvcfdserrtyyuikjnhbvcxdsew45678uiolk,m,nbvcxdsewr5678uiol;,mnbvcdxsawq345678iolk,mnbvgfcdre678iolk,mnbvcfdsew45678