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মেকানিক্যাল ইঞ্জিনিয়ারিং

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3631. MCQPractice set · Question 83

Creep-এর tertiary stage-এর ফল কী?

a.
rupture
b.
elastic recovery
c.
zero strain
d.
surface wetting

Correct answer: a

Tertiary creep-এ accelerating strain শেষে rupture হতে পারে।

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3632. MCQPractice set · Question 84

Viscoelastic material-এর বৈশিষ্ট্য কী?

a.
elastic ও viscous উভয় behavior
b.
শুধু brittle
c.
শুধু rigid
d.
শুধু density

Correct answer: a

Viscoelastic response time ও loading history-এর উপর নির্ভর করে।

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3633. MCQPractice set · Question 85

Young's modulus-এর dimension কী?

a.
ML⁻¹T⁻²
b.
ML²T⁻²
c.
MLT⁻¹
d.
M⁰L⁰T⁰

Correct answer: a

Modulus stress-এর dimension ML⁻¹T⁻²।

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3634. MCQPractice set · Question 86

Stress-এর dimension কী?

a.
ML⁻¹T⁻²
b.
ML²T⁻²
c.
MLT⁻²
d.
ML⁻²T⁻¹

Correct answer: a

Stress=force/area=MLT⁻²/L²=ML⁻¹T⁻²।

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3635. MCQPractice set · Question 87

Strain-এর dimension কী?

a.
dimensionless
b.
ML⁻¹T⁻²
c.
MLT⁻²
d.
L

Correct answer: a

Strain length ratio, তাই dimensionless।

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3636. MCQPractice set · Question 88

Bulk modulus-এর unit কী?

a.
Pa
b.
N/m
c.
J
d.
m³/kg

Correct answer: a

Bulk modulus pressure-এর মতো Pa unit।

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3637. MCQPractice set · Question 89

Shear modulus-এর unit কী?

a.
Pa
b.
m/s
c.
kg/m³
d.
J/s

Correct answer: a

Shear modulus stress/strain, তাই Pa।

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3638. MCQPractice set · Question 90

একটি rod-এর length 2 m, extension 2 mm হলে strain কত?

a.
0.001
b.
0.01
c.
1000
d.
2.002

Correct answer: a

Strain=0.002/2=0.001।

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3639. MCQPractice set · Question 91

Force 1000 N ও area 0.01 m² হলে stress কত?

a.
100 kPa
b.
10 kPa
c.
1000 Pa
d.
0.01 Pa

Correct answer: a

Stress=1000/0.01=100000 Pa=100 kPa।

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3640. MCQPractice set · Question 92

Stress 100 MPa ও strain 0.001 হলে E কত?

a.
100 GPa
b.
100 MPa
c.
0.1 GPa
d.
1 GPa

Correct answer: a

E=100 MPa/0.001=100 GPa।

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