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মেকানিক্যাল ইঞ্জিনিয়ারিং

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1751. MCQPractice set · Question 11

Inelastic collision-এ কোনটি conserved থাকে?

a.
momentum if isolated
b.
kinetic energy always
c.
each velocity
d.
each momentum

Correct answer: a

Inelastic হলেও isolated system-এর total momentum conserved।

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1752. MCQPractice set · Question 12

Perfectly inelastic collision-এর coefficient of restitution কত?

a.
0
b.
1
c.
−1
d.
2

Correct answer: a

After collision relative speed zero, তাই e=0।

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1753. MCQPractice set · Question 13

Perfectly elastic collision-এর coefficient of restitution কত?

a.
0
b.
1
c.
−1
d.
infinite

Correct answer: b

Elastic collision-এ separation ও approach relative speed-এর ratio 1।

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1754. MCQPractice set · Question 14

Coefficient of restitution-এর formula কী?

a.
relative separation speed/relative approach speed
b.
mass/speed
c.
force/time
d.
momentum/energy

Correct answer: a

e=(v₂−v₁)/(u₁−u₂) along collision line।

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1755. MCQPractice set · Question 15

একটি 2 kg body 3 m/s-এ এবং 1 kg body rest-এ; তারা stick করলে common speed কত?

a.
1 m/s
b.
2 m/s
c.
3 m/s
d.
6 m/s

Correct answer: b

Initial p=2×3=6; total mass 3 kg, v=6/3=2 m/s।

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1756. MCQPractice set · Question 16

একটি 1 kg body 6 m/s east এবং 1 kg body 2 m/s west; stick করলে speed কত?

a.
2 m/s east
b.
4 m/s east
c.
8 m/s east
d.
0

Correct answer: a

Net p=6−2=4; total mass 2, v=2 m/s east।

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1757. MCQPractice set · Question 17

দুটি equal mass opposite equal velocity-তে collision করলে stick করার পরে velocity কী?

a.
0
b.
u
c.
2u
d.
−u

Correct answer: a

Initial total momentum zero, তাই final common velocity zero।

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1758. MCQPractice set · Question 18

Recoil-এর ক্ষেত্রে initial total momentum সাধারণত কত?

a.
0 if system initially rest
b.
maximum
c.
mass-এর সমান
d.
infinite

Correct answer: a

Initially rest system-এর total momentum zero।

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1759. MCQPractice set · Question 19

Gun থেকে bullet forward বের হলে gun কোন momentum পায়?

a.
equal opposite backward
b.
same forward
c.
zero always
d.
upward

Correct answer: a

Momentum conservation gun-কে backward recoil দেয়।

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1760. MCQPractice set · Question 20

Rocket propulsion-এর ভিত্তি কী?

a.
momentum conservation
b.
static equilibrium
c.
Archimedes principle
d.
thermal expansion only

Correct answer: a

Exhaust gas backward momentum পেলে rocket forward momentum পায়।

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