MCQ on Mechanical Engineering Mechanical Engineering Notes | EduRev

Mechanical Engineering : MCQ on Mechanical Engineering Mechanical Engineering Notes | EduRev

 Page 1


 
Topic Questi
on No. 
Question Option A Option B Option C Option D Answer 
Key 
Engineering 
Mechanics 
and Strength 
of Materials / 
Concepts of 
stress and 
strain 1 
The term 
deformation 
per unit length 
is applied for Stress Strain 
Modulus of 
elasticity 
Modulus of 
Rigidity B  
Engineering 
Mechanics 
and Strength 
of Materials / 
Concepts of 
stress and 
strain 2 
In a universal 
testing 
machine 
during the 
testing of a 
specimen of 
original cross -
sectional area 
1 cm² the 
maximum load 
applied was 
7.5 tonnes and 
neck area 0.6 
sq.cm the 
ultimate tensile 
strength of the 
specimen is 
4.6. 
tonnes/cm² 
7.5 
tonnes/cm² 
12.5 
tonnes/cm² 
18.75 
tonnes/cm² C  
Engineering 
Mechanics 
and Strength 
of Materials / 
Concepts of 
stress and 
strain 3 
The elongation 
produced in a 
rod by its own 
weight, of 
length (l) and 
diameter (d) 
rigidly fixed at 
the upper end 
and hanging is 
equal to: - ( 
where w = 
weight per unit 
volume of the 
rod and E = 
modulus of 
elasticity ) wl/2E wl²/2E wl³/2E wl
4
/2E   
Engineering 
Mechanics 
and Strength 
of Materials / 
Elastic limit 
and elastic 
constants 4 
The bulk 
modulus of the 
body is equal 
to m E/ 3 (m - 2) 
m E/ 3 (m + 
2) m E/ 2 (m - 2) 
m E/ 2 (m + 
2) A  
Engineering 
Mechanics 
and Strength 
of Materials / 
Elastic limit 
and elastic 
constants 5 
An alloy 
specimen has 
a modulus of 
elasticity of 
120 GPa and 
modulus of 
rigidity of 45 
GPa. The 3-Jan 2-Jan 4-Jan 5-Jan 
Not 
proper 
Answer  
Page 2


 
Topic Questi
on No. 
Question Option A Option B Option C Option D Answer 
Key 
Engineering 
Mechanics 
and Strength 
of Materials / 
Concepts of 
stress and 
strain 1 
The term 
deformation 
per unit length 
is applied for Stress Strain 
Modulus of 
elasticity 
Modulus of 
Rigidity B  
Engineering 
Mechanics 
and Strength 
of Materials / 
Concepts of 
stress and 
strain 2 
In a universal 
testing 
machine 
during the 
testing of a 
specimen of 
original cross -
sectional area 
1 cm² the 
maximum load 
applied was 
7.5 tonnes and 
neck area 0.6 
sq.cm the 
ultimate tensile 
strength of the 
specimen is 
4.6. 
tonnes/cm² 
7.5 
tonnes/cm² 
12.5 
tonnes/cm² 
18.75 
tonnes/cm² C  
Engineering 
Mechanics 
and Strength 
of Materials / 
Concepts of 
stress and 
strain 3 
The elongation 
produced in a 
rod by its own 
weight, of 
length (l) and 
diameter (d) 
rigidly fixed at 
the upper end 
and hanging is 
equal to: - ( 
where w = 
weight per unit 
volume of the 
rod and E = 
modulus of 
elasticity ) wl/2E wl²/2E wl³/2E wl
4
/2E   
Engineering 
Mechanics 
and Strength 
of Materials / 
Elastic limit 
and elastic 
constants 4 
The bulk 
modulus of the 
body is equal 
to m E/ 3 (m - 2) 
m E/ 3 (m + 
2) m E/ 2 (m - 2) 
m E/ 2 (m + 
2) A  
Engineering 
Mechanics 
and Strength 
of Materials / 
Elastic limit 
and elastic 
constants 5 
An alloy 
specimen has 
a modulus of 
elasticity of 
120 GPa and 
modulus of 
rigidity of 45 
GPa. The 3-Jan 2-Jan 4-Jan 5-Jan 
Not 
proper 
Answer  
Poisson's ratio 
of the material 
is. 
Engineering 
Mechanics 
and Strength 
of Materials / 
Thin walled 
pressure 
vessels 6 
In case of thin 
cylinder, which 
one is a 
correct 
statement 
The hoop 
stress in a 
thin 
cylinderical 
shell is 
compressive 
stress. 
The ratio of 
hoop stress 
to longitudinal 
stress for a 
thin 
cylindrical 
shell is 1/2 
The shear 
stress in a 
thin spherical 
shell is more 
than that of in 
a thin 
cylindrical 
shell. 
The design of 
thin 
cylindrical 
shell is based 
upon hoop 
stress B 
Engineering 
Mechanics 
and Strength 
of Materials / 
Thin walled 
pressure 
vessels 7 
The 
longitudinal 
strain in case 
of thin cylinder 
shell, when 
subjected to 
internal 
pressure (p), is 
equal to 
( pd/2tE) ( 1/2 
- 1/m ) 
( pd/2tE) (1 - 
1/2m ) 
( pd/4tE) (1 - 
1/m ) 
( 3pd/4tE) ( 1 
- 1/m ) A  
Engineering 
Mechanics 
and Strength 
of Materials / 
Stress in 
composite 
barsm, 
Torsion of 
circular shafts 8 
Polar moment 
of inertia of a 
solid circular 
shaft of 
diameter D is 
equal to pD³/32 pD
4
/32 pD³/64 pD
4
/64 D  
Engineering 
Mechanics 
and Strength 
of Materials / 
Stress in 
composite 
barsm, 
Torsion of 
circular shafts 9 
A steel rod of 3 
cm of diameter 
is enclosed 
centrally in a 
hollow copper 
tube of 
external 
diameter 5 cm 
and internal 
diameter of 4 
cm. The 
composite bar 
is then 
subjected to 
an axial pull of 
45000 N. If the 
length of each 
bar is equal to 
15 cm , E for 
steel = 2.1 X 
105 N/mm2 
and for copper 
is = 1.1 X105 
N/mm2 ,the 
stress in tube 
is 21.88 N/mm² 41.77 N/mm² 31. 88 N/mm² 51.77 N/mm²   
Engineering 
Mechanics 
and Strength 
of Materials / 
Bending 
moments and 
shear force 10 
A simply 
supported 
beam of length 
L carrying a 
load 
concentrated 
at the centre of wL wL/ 4 wL/2 wL/8 B  
Page 3


 
Topic Questi
on No. 
Question Option A Option B Option C Option D Answer 
Key 
Engineering 
Mechanics 
and Strength 
of Materials / 
Concepts of 
stress and 
strain 1 
The term 
deformation 
per unit length 
is applied for Stress Strain 
Modulus of 
elasticity 
Modulus of 
Rigidity B  
Engineering 
Mechanics 
and Strength 
of Materials / 
Concepts of 
stress and 
strain 2 
In a universal 
testing 
machine 
during the 
testing of a 
specimen of 
original cross -
sectional area 
1 cm² the 
maximum load 
applied was 
7.5 tonnes and 
neck area 0.6 
sq.cm the 
ultimate tensile 
strength of the 
specimen is 
4.6. 
tonnes/cm² 
7.5 
tonnes/cm² 
12.5 
tonnes/cm² 
18.75 
tonnes/cm² C  
Engineering 
Mechanics 
and Strength 
of Materials / 
Concepts of 
stress and 
strain 3 
The elongation 
produced in a 
rod by its own 
weight, of 
length (l) and 
diameter (d) 
rigidly fixed at 
the upper end 
and hanging is 
equal to: - ( 
where w = 
weight per unit 
volume of the 
rod and E = 
modulus of 
elasticity ) wl/2E wl²/2E wl³/2E wl
4
/2E   
Engineering 
Mechanics 
and Strength 
of Materials / 
Elastic limit 
and elastic 
constants 4 
The bulk 
modulus of the 
body is equal 
to m E/ 3 (m - 2) 
m E/ 3 (m + 
2) m E/ 2 (m - 2) 
m E/ 2 (m + 
2) A  
Engineering 
Mechanics 
and Strength 
of Materials / 
Elastic limit 
and elastic 
constants 5 
An alloy 
specimen has 
a modulus of 
elasticity of 
120 GPa and 
modulus of 
rigidity of 45 
GPa. The 3-Jan 2-Jan 4-Jan 5-Jan 
Not 
proper 
Answer  
Poisson's ratio 
of the material 
is. 
Engineering 
Mechanics 
and Strength 
of Materials / 
Thin walled 
pressure 
vessels 6 
In case of thin 
cylinder, which 
one is a 
correct 
statement 
The hoop 
stress in a 
thin 
cylinderical 
shell is 
compressive 
stress. 
The ratio of 
hoop stress 
to longitudinal 
stress for a 
thin 
cylindrical 
shell is 1/2 
The shear 
stress in a 
thin spherical 
shell is more 
than that of in 
a thin 
cylindrical 
shell. 
The design of 
thin 
cylindrical 
shell is based 
upon hoop 
stress B 
Engineering 
Mechanics 
and Strength 
of Materials / 
Thin walled 
pressure 
vessels 7 
The 
longitudinal 
strain in case 
of thin cylinder 
shell, when 
subjected to 
internal 
pressure (p), is 
equal to 
( pd/2tE) ( 1/2 
- 1/m ) 
( pd/2tE) (1 - 
1/2m ) 
( pd/4tE) (1 - 
1/m ) 
( 3pd/4tE) ( 1 
- 1/m ) A  
Engineering 
Mechanics 
and Strength 
of Materials / 
Stress in 
composite 
barsm, 
Torsion of 
circular shafts 8 
Polar moment 
of inertia of a 
solid circular 
shaft of 
diameter D is 
equal to pD³/32 pD
4
/32 pD³/64 pD
4
/64 D  
Engineering 
Mechanics 
and Strength 
of Materials / 
Stress in 
composite 
barsm, 
Torsion of 
circular shafts 9 
A steel rod of 3 
cm of diameter 
is enclosed 
centrally in a 
hollow copper 
tube of 
external 
diameter 5 cm 
and internal 
diameter of 4 
cm. The 
composite bar 
is then 
subjected to 
an axial pull of 
45000 N. If the 
length of each 
bar is equal to 
15 cm , E for 
steel = 2.1 X 
105 N/mm2 
and for copper 
is = 1.1 X105 
N/mm2 ,the 
stress in tube 
is 21.88 N/mm² 41.77 N/mm² 31. 88 N/mm² 51.77 N/mm²   
Engineering 
Mechanics 
and Strength 
of Materials / 
Bending 
moments and 
shear force 10 
A simply 
supported 
beam of length 
L carrying a 
load 
concentrated 
at the centre of wL wL/ 4 wL/2 wL/8 B  
diagram span will have 
maximum 
bending 
moment of 
Engineering 
Mechanics 
and Strength 
of Materials / 
Bending 
moments and 
shear force 
diagram 11 
A beam of 
uniform 
strength is one 
which has 
same 
Bending 
stress at 
every section 
Deflection 
throughout 
the beam 
Bending 
moment 
throughout 
the beam 
Shear force 
throughout 
the beam C  
Engineering 
Mechanics 
and Strength 
of Materials / 
Bending 
moments and 
shear force 
diagram 12 
A simply 
supported 
beam a 
uniformly 
distributed 
load of w N per 
unit length 
over the whole 
span (l). The 
point of 
contraflexure 
is at 
The suppoted 
end 
The middle of 
the beam 
No point of 
contraflexture 
A distance 
(l/4) from the 
supported 
end C  
Engineering 
Mechanics 
and Strength 
of Materials / 
Equilibrium of 
Forces 13 
If a number of 
forces are 
acting at a 
point, their 
resultant will 
be inclined at 
an angle ? with 
the horizontal, 
such that 
tan ? = 
?V/?H 
tan ? = 
?Vx?H 
tan ? = 
?Hx?V 
tan ? = 
?H/?V A  
Engineering 
Mechanics 
and Strength 
of Materials / 
Equilibrium of 
Forces 14 
If two forces of 
magnitude 'P' 
act at an angle 
'?' there 
resultant will 
be 2P Cos? P Cos2? P Cos? Sin? 2P Cos?/2 A  
Engineering 
Mechanics 
and Strength 
of Materials / 
Equilibrium of 
Forces 15 
Two forces 
which when 
acting at right 
angles 
produce 
resultant force 
of 10 and 
when acting at 
60° produce 
resultant of 
v148. These 
forces are 3 and 4 6 and 8 5 and 5 4 and 6 B  
Engineering 
Mechanics 
and Strength 
of Materials / 
Law of 
motion, 
Friction 16 
If the angle of 
friction is zero 
a body will 
experience Infinite friction Zero Friction 
The force of 
friction will 
act normal to 
the plane 
The force of 
friction will 
act in the 
direction of 
motion B 
Engineering 
Mechanics 
and Strength 17 
The least force 
to drag a body 
of 600N along 200v3 N 450 N 300 N 250 N A 
Page 4


 
Topic Questi
on No. 
Question Option A Option B Option C Option D Answer 
Key 
Engineering 
Mechanics 
and Strength 
of Materials / 
Concepts of 
stress and 
strain 1 
The term 
deformation 
per unit length 
is applied for Stress Strain 
Modulus of 
elasticity 
Modulus of 
Rigidity B  
Engineering 
Mechanics 
and Strength 
of Materials / 
Concepts of 
stress and 
strain 2 
In a universal 
testing 
machine 
during the 
testing of a 
specimen of 
original cross -
sectional area 
1 cm² the 
maximum load 
applied was 
7.5 tonnes and 
neck area 0.6 
sq.cm the 
ultimate tensile 
strength of the 
specimen is 
4.6. 
tonnes/cm² 
7.5 
tonnes/cm² 
12.5 
tonnes/cm² 
18.75 
tonnes/cm² C  
Engineering 
Mechanics 
and Strength 
of Materials / 
Concepts of 
stress and 
strain 3 
The elongation 
produced in a 
rod by its own 
weight, of 
length (l) and 
diameter (d) 
rigidly fixed at 
the upper end 
and hanging is 
equal to: - ( 
where w = 
weight per unit 
volume of the 
rod and E = 
modulus of 
elasticity ) wl/2E wl²/2E wl³/2E wl
4
/2E   
Engineering 
Mechanics 
and Strength 
of Materials / 
Elastic limit 
and elastic 
constants 4 
The bulk 
modulus of the 
body is equal 
to m E/ 3 (m - 2) 
m E/ 3 (m + 
2) m E/ 2 (m - 2) 
m E/ 2 (m + 
2) A  
Engineering 
Mechanics 
and Strength 
of Materials / 
Elastic limit 
and elastic 
constants 5 
An alloy 
specimen has 
a modulus of 
elasticity of 
120 GPa and 
modulus of 
rigidity of 45 
GPa. The 3-Jan 2-Jan 4-Jan 5-Jan 
Not 
proper 
Answer  
Poisson's ratio 
of the material 
is. 
Engineering 
Mechanics 
and Strength 
of Materials / 
Thin walled 
pressure 
vessels 6 
In case of thin 
cylinder, which 
one is a 
correct 
statement 
The hoop 
stress in a 
thin 
cylinderical 
shell is 
compressive 
stress. 
The ratio of 
hoop stress 
to longitudinal 
stress for a 
thin 
cylindrical 
shell is 1/2 
The shear 
stress in a 
thin spherical 
shell is more 
than that of in 
a thin 
cylindrical 
shell. 
The design of 
thin 
cylindrical 
shell is based 
upon hoop 
stress B 
Engineering 
Mechanics 
and Strength 
of Materials / 
Thin walled 
pressure 
vessels 7 
The 
longitudinal 
strain in case 
of thin cylinder 
shell, when 
subjected to 
internal 
pressure (p), is 
equal to 
( pd/2tE) ( 1/2 
- 1/m ) 
( pd/2tE) (1 - 
1/2m ) 
( pd/4tE) (1 - 
1/m ) 
( 3pd/4tE) ( 1 
- 1/m ) A  
Engineering 
Mechanics 
and Strength 
of Materials / 
Stress in 
composite 
barsm, 
Torsion of 
circular shafts 8 
Polar moment 
of inertia of a 
solid circular 
shaft of 
diameter D is 
equal to pD³/32 pD
4
/32 pD³/64 pD
4
/64 D  
Engineering 
Mechanics 
and Strength 
of Materials / 
Stress in 
composite 
barsm, 
Torsion of 
circular shafts 9 
A steel rod of 3 
cm of diameter 
is enclosed 
centrally in a 
hollow copper 
tube of 
external 
diameter 5 cm 
and internal 
diameter of 4 
cm. The 
composite bar 
is then 
subjected to 
an axial pull of 
45000 N. If the 
length of each 
bar is equal to 
15 cm , E for 
steel = 2.1 X 
105 N/mm2 
and for copper 
is = 1.1 X105 
N/mm2 ,the 
stress in tube 
is 21.88 N/mm² 41.77 N/mm² 31. 88 N/mm² 51.77 N/mm²   
Engineering 
Mechanics 
and Strength 
of Materials / 
Bending 
moments and 
shear force 10 
A simply 
supported 
beam of length 
L carrying a 
load 
concentrated 
at the centre of wL wL/ 4 wL/2 wL/8 B  
diagram span will have 
maximum 
bending 
moment of 
Engineering 
Mechanics 
and Strength 
of Materials / 
Bending 
moments and 
shear force 
diagram 11 
A beam of 
uniform 
strength is one 
which has 
same 
Bending 
stress at 
every section 
Deflection 
throughout 
the beam 
Bending 
moment 
throughout 
the beam 
Shear force 
throughout 
the beam C  
Engineering 
Mechanics 
and Strength 
of Materials / 
Bending 
moments and 
shear force 
diagram 12 
A simply 
supported 
beam a 
uniformly 
distributed 
load of w N per 
unit length 
over the whole 
span (l). The 
point of 
contraflexure 
is at 
The suppoted 
end 
The middle of 
the beam 
No point of 
contraflexture 
A distance 
(l/4) from the 
supported 
end C  
Engineering 
Mechanics 
and Strength 
of Materials / 
Equilibrium of 
Forces 13 
If a number of 
forces are 
acting at a 
point, their 
resultant will 
be inclined at 
an angle ? with 
the horizontal, 
such that 
tan ? = 
?V/?H 
tan ? = 
?Vx?H 
tan ? = 
?Hx?V 
tan ? = 
?H/?V A  
Engineering 
Mechanics 
and Strength 
of Materials / 
Equilibrium of 
Forces 14 
If two forces of 
magnitude 'P' 
act at an angle 
'?' there 
resultant will 
be 2P Cos? P Cos2? P Cos? Sin? 2P Cos?/2 A  
Engineering 
Mechanics 
and Strength 
of Materials / 
Equilibrium of 
Forces 15 
Two forces 
which when 
acting at right 
angles 
produce 
resultant force 
of 10 and 
when acting at 
60° produce 
resultant of 
v148. These 
forces are 3 and 4 6 and 8 5 and 5 4 and 6 B  
Engineering 
Mechanics 
and Strength 
of Materials / 
Law of 
motion, 
Friction 16 
If the angle of 
friction is zero 
a body will 
experience Infinite friction Zero Friction 
The force of 
friction will 
act normal to 
the plane 
The force of 
friction will 
act in the 
direction of 
motion B 
Engineering 
Mechanics 
and Strength 17 
The least force 
to drag a body 
of 600N along 200v3 N 450 N 300 N 250 N A 
of Materials / 
Law of 
motion, 
Friction 
a rough 
horizontal 
plane (angle of 
friction=30deg) 
is 
Engineering 
Mechanics 
and Strength 
of Materials / 
Buckling of 
columns- 
Euler’s and 
Rankin’s 
theories 18 
A loaded 
column having 
the tendency 
to deflect. On 
account of this 
tendency, the 
critical load 
Decreases 
with the 
decrease in 
length 
Decreases 
with the 
increase in 
length 
First 
decreases 
then 
increases 
with the 
decrease in 
length 
First 
increases 
then 
decreases 
with the 
decrease in 
length  C 
Engineering 
Mechanics 
and Strength 
of Materials / 
Buckling of 
columns- 
Euler’s and 
Rankin’s 
theories 19 
The ratio of 
crippling load 
for a column of 
length 'l' with 
both ends 
fixed to the 
crippling load 
of the same 
column with 
both ends 
hinged, is 
equal to 2 4 0.25 0.5 B 
Engineering 
Mechanics 
and Strength 
of Materials / 
Buckling of 
columns- 
Euler’s and 
Rankin’s 
theories 20 
A solid round 
circular bar 3 
m long and 5 
cm in diameter 
is used as a 
strut with both 
ends hinged 
having 
E=2x105 
N/mm2. The 
crippling load 
is 67.28 KN 134.56 KN 269.12 KN 16.82 KN 
 
2nd Law of 
Thermodynam
ics / Definition 
of Sink 21 
What is heat 
sink in 
thermodynami
cs? 
Device to 
absorb heat 
Device to 
absorb mass 
Device from 
which heat is 
transferred 
Device from 
which mass 
is transferred B  
2nd Law of 
Thermodynam
ics / Definition 
of Sink 22 
Sadi Carnot, 
proposed a 
reversible 
cyclein in 
1824, in a 
Carnot Cycle 
the working 
medium 
receives heat 
at which of the 
following? 
No 
temperature 
required 
Lower 
temperature 
Higher 
temperature 
Constant 
temperature A  
2nd Law of 
Thermodynam
ics / Definition 
of Sink 23 
A heat engine 
works on a 
Carnot cycle 
with a heat 
sink at a 
temperature of 
27°C. What 
would be the 
temperature of 30°C 60°C 90°C 100°C  A 
Page 5


 
Topic Questi
on No. 
Question Option A Option B Option C Option D Answer 
Key 
Engineering 
Mechanics 
and Strength 
of Materials / 
Concepts of 
stress and 
strain 1 
The term 
deformation 
per unit length 
is applied for Stress Strain 
Modulus of 
elasticity 
Modulus of 
Rigidity B  
Engineering 
Mechanics 
and Strength 
of Materials / 
Concepts of 
stress and 
strain 2 
In a universal 
testing 
machine 
during the 
testing of a 
specimen of 
original cross -
sectional area 
1 cm² the 
maximum load 
applied was 
7.5 tonnes and 
neck area 0.6 
sq.cm the 
ultimate tensile 
strength of the 
specimen is 
4.6. 
tonnes/cm² 
7.5 
tonnes/cm² 
12.5 
tonnes/cm² 
18.75 
tonnes/cm² C  
Engineering 
Mechanics 
and Strength 
of Materials / 
Concepts of 
stress and 
strain 3 
The elongation 
produced in a 
rod by its own 
weight, of 
length (l) and 
diameter (d) 
rigidly fixed at 
the upper end 
and hanging is 
equal to: - ( 
where w = 
weight per unit 
volume of the 
rod and E = 
modulus of 
elasticity ) wl/2E wl²/2E wl³/2E wl
4
/2E   
Engineering 
Mechanics 
and Strength 
of Materials / 
Elastic limit 
and elastic 
constants 4 
The bulk 
modulus of the 
body is equal 
to m E/ 3 (m - 2) 
m E/ 3 (m + 
2) m E/ 2 (m - 2) 
m E/ 2 (m + 
2) A  
Engineering 
Mechanics 
and Strength 
of Materials / 
Elastic limit 
and elastic 
constants 5 
An alloy 
specimen has 
a modulus of 
elasticity of 
120 GPa and 
modulus of 
rigidity of 45 
GPa. The 3-Jan 2-Jan 4-Jan 5-Jan 
Not 
proper 
Answer  
Poisson's ratio 
of the material 
is. 
Engineering 
Mechanics 
and Strength 
of Materials / 
Thin walled 
pressure 
vessels 6 
In case of thin 
cylinder, which 
one is a 
correct 
statement 
The hoop 
stress in a 
thin 
cylinderical 
shell is 
compressive 
stress. 
The ratio of 
hoop stress 
to longitudinal 
stress for a 
thin 
cylindrical 
shell is 1/2 
The shear 
stress in a 
thin spherical 
shell is more 
than that of in 
a thin 
cylindrical 
shell. 
The design of 
thin 
cylindrical 
shell is based 
upon hoop 
stress B 
Engineering 
Mechanics 
and Strength 
of Materials / 
Thin walled 
pressure 
vessels 7 
The 
longitudinal 
strain in case 
of thin cylinder 
shell, when 
subjected to 
internal 
pressure (p), is 
equal to 
( pd/2tE) ( 1/2 
- 1/m ) 
( pd/2tE) (1 - 
1/2m ) 
( pd/4tE) (1 - 
1/m ) 
( 3pd/4tE) ( 1 
- 1/m ) A  
Engineering 
Mechanics 
and Strength 
of Materials / 
Stress in 
composite 
barsm, 
Torsion of 
circular shafts 8 
Polar moment 
of inertia of a 
solid circular 
shaft of 
diameter D is 
equal to pD³/32 pD
4
/32 pD³/64 pD
4
/64 D  
Engineering 
Mechanics 
and Strength 
of Materials / 
Stress in 
composite 
barsm, 
Torsion of 
circular shafts 9 
A steel rod of 3 
cm of diameter 
is enclosed 
centrally in a 
hollow copper 
tube of 
external 
diameter 5 cm 
and internal 
diameter of 4 
cm. The 
composite bar 
is then 
subjected to 
an axial pull of 
45000 N. If the 
length of each 
bar is equal to 
15 cm , E for 
steel = 2.1 X 
105 N/mm2 
and for copper 
is = 1.1 X105 
N/mm2 ,the 
stress in tube 
is 21.88 N/mm² 41.77 N/mm² 31. 88 N/mm² 51.77 N/mm²   
Engineering 
Mechanics 
and Strength 
of Materials / 
Bending 
moments and 
shear force 10 
A simply 
supported 
beam of length 
L carrying a 
load 
concentrated 
at the centre of wL wL/ 4 wL/2 wL/8 B  
diagram span will have 
maximum 
bending 
moment of 
Engineering 
Mechanics 
and Strength 
of Materials / 
Bending 
moments and 
shear force 
diagram 11 
A beam of 
uniform 
strength is one 
which has 
same 
Bending 
stress at 
every section 
Deflection 
throughout 
the beam 
Bending 
moment 
throughout 
the beam 
Shear force 
throughout 
the beam C  
Engineering 
Mechanics 
and Strength 
of Materials / 
Bending 
moments and 
shear force 
diagram 12 
A simply 
supported 
beam a 
uniformly 
distributed 
load of w N per 
unit length 
over the whole 
span (l). The 
point of 
contraflexure 
is at 
The suppoted 
end 
The middle of 
the beam 
No point of 
contraflexture 
A distance 
(l/4) from the 
supported 
end C  
Engineering 
Mechanics 
and Strength 
of Materials / 
Equilibrium of 
Forces 13 
If a number of 
forces are 
acting at a 
point, their 
resultant will 
be inclined at 
an angle ? with 
the horizontal, 
such that 
tan ? = 
?V/?H 
tan ? = 
?Vx?H 
tan ? = 
?Hx?V 
tan ? = 
?H/?V A  
Engineering 
Mechanics 
and Strength 
of Materials / 
Equilibrium of 
Forces 14 
If two forces of 
magnitude 'P' 
act at an angle 
'?' there 
resultant will 
be 2P Cos? P Cos2? P Cos? Sin? 2P Cos?/2 A  
Engineering 
Mechanics 
and Strength 
of Materials / 
Equilibrium of 
Forces 15 
Two forces 
which when 
acting at right 
angles 
produce 
resultant force 
of 10 and 
when acting at 
60° produce 
resultant of 
v148. These 
forces are 3 and 4 6 and 8 5 and 5 4 and 6 B  
Engineering 
Mechanics 
and Strength 
of Materials / 
Law of 
motion, 
Friction 16 
If the angle of 
friction is zero 
a body will 
experience Infinite friction Zero Friction 
The force of 
friction will 
act normal to 
the plane 
The force of 
friction will 
act in the 
direction of 
motion B 
Engineering 
Mechanics 
and Strength 17 
The least force 
to drag a body 
of 600N along 200v3 N 450 N 300 N 250 N A 
of Materials / 
Law of 
motion, 
Friction 
a rough 
horizontal 
plane (angle of 
friction=30deg) 
is 
Engineering 
Mechanics 
and Strength 
of Materials / 
Buckling of 
columns- 
Euler’s and 
Rankin’s 
theories 18 
A loaded 
column having 
the tendency 
to deflect. On 
account of this 
tendency, the 
critical load 
Decreases 
with the 
decrease in 
length 
Decreases 
with the 
increase in 
length 
First 
decreases 
then 
increases 
with the 
decrease in 
length 
First 
increases 
then 
decreases 
with the 
decrease in 
length  C 
Engineering 
Mechanics 
and Strength 
of Materials / 
Buckling of 
columns- 
Euler’s and 
Rankin’s 
theories 19 
The ratio of 
crippling load 
for a column of 
length 'l' with 
both ends 
fixed to the 
crippling load 
of the same 
column with 
both ends 
hinged, is 
equal to 2 4 0.25 0.5 B 
Engineering 
Mechanics 
and Strength 
of Materials / 
Buckling of 
columns- 
Euler’s and 
Rankin’s 
theories 20 
A solid round 
circular bar 3 
m long and 5 
cm in diameter 
is used as a 
strut with both 
ends hinged 
having 
E=2x105 
N/mm2. The 
crippling load 
is 67.28 KN 134.56 KN 269.12 KN 16.82 KN 
 
2nd Law of 
Thermodynam
ics / Definition 
of Sink 21 
What is heat 
sink in 
thermodynami
cs? 
Device to 
absorb heat 
Device to 
absorb mass 
Device from 
which heat is 
transferred 
Device from 
which mass 
is transferred B  
2nd Law of 
Thermodynam
ics / Definition 
of Sink 22 
Sadi Carnot, 
proposed a 
reversible 
cyclein in 
1824, in a 
Carnot Cycle 
the working 
medium 
receives heat 
at which of the 
following? 
No 
temperature 
required 
Lower 
temperature 
Higher 
temperature 
Constant 
temperature A  
2nd Law of 
Thermodynam
ics / Definition 
of Sink 23 
A heat engine 
works on a 
Carnot cycle 
with a heat 
sink at a 
temperature of 
27°C. What 
would be the 
temperature of 30°C 60°C 90°C 100°C  A 
the heat at 
source if 
efficiency of 
the engine is 
10%? 
2nd Law of 
Thermodynam
ics / Source 
Reservoir of 
Heat, Heat 
Engine, Heat 
pump and 
Refrigerator 24 
What do you 
mean by 
antifreeze 
chemicals? 
Substance 
that increases 
freezing point 
of water 
Substance 
that lowers 
the freezing 
point of water 
Substance 
that will not 
effect the 
freezing point 
of water 
Substance 
that 
evaporates 
the water B  
2nd Law of 
Thermodynam
ics / Source 
Reservoir of 
Heat, Heat 
Engine, Heat 
pump and 
Refrigerator 25 
An Electrolux 
refrigerator is 
called as 
Single-fluid 
absorption 
system 
Three-fluid 
absorption 
system 
Two-fluid 
absorption 
system 
No fluid 
absorption 
system B  
2nd Law of 
Thermodynam
ics / Thermal 
efficiency of 
heat engines 
and co-
efficient of 
performance 
of 
Refrigerators 26 
Which of the 
following 
device controls 
the flow of 
refrigerant in a 
refrigeration 
cycle? Condenser Compressor Evaporator 
Expansion 
valve  D 
2nd Law of 
Thermodynam
ics / Thermal 
efficiency of 
heat engines 
and co-
efficient of 
performance 
of 
Refrigerators 27 
Isothermal 
efficiency is 
defined by 
which of the 
following in 
reciprocating 
compressor 
Isothermal 
work / Actual 
indicated work 
Adiabatic 
work / 
indicated 
work 
Isothermal 
work / 
Adiabatic 
work 
Adiabatic 
work / 
Frictionless 
work A  
2nd Law of 
Thermodynam
ics / Thermal 
efficiency of 
heat engines 
and co-
efficient of 
performance 
of 
Refrigerators 28 
What will be 
COP of heat 
pump if Q1 is 
the heat 
transfer 
between hot 
temperature 
source 
machine and 
Q2 between 
cold 
temperature 
source 
machine? Q1/Q1-Q2 Q2/Q2-Q1 Q1/Q2-Q1 Q2/Q1-Q2  A 
2nd Law of 
Thermodynam
ics / Kelvin–
Plank & 
Clausius 29 
Kelvin Planck’s 
law deals with 
which of the 
following? 
Conservation 
of energy into 
mass 
Conservation 
of mass into 
energy 
Conversion of 
heat into 
work 
Conversion of 
work into 
heat C 
2nd Law of 30 Which of the A machine A machine A machine A machine A  
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