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কেমিক্যাল ইঞ্জিনিয়ারিং

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2211. MCQPractice set · Question 63

Satellite-এর potential energy circular orbit-এ কী?

a.
−GMm/r
b.
GMm/(2r)
c.
0
d.
GMm/r²

Correct answer: a

Gravitational potential energy U=−GMm/r।

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2212. MCQPractice set · Question 64

Satellite-এর total energy কী?

a.
−GMm/(2r)
b.
+GMm/(2r)
c.
0
d.
−GMm/r²

Correct answer: a

E=K+U=GMm/(2r)−GMm/r=−GMm/(2r)।

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2213. MCQPractice set · Question 65

Satellite orbit-এ gravitational force-এর work কী?

a.
instantaneous zero
b.
positive সবসময়
c.
negative সবসময়
d.
infinite

Correct answer: a

Circular orbit-এ force radial এবং velocity tangential।

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2214. MCQPractice set · Question 66

Planet-এর orbit elliptical হলে speed কোথায় maximum?

a.
perihelion
b.
aphelion
c.
centre
d.
সব জায়গায়

Correct answer: a

Sun-এর কাছে gravitational attraction ও angular momentum condition speed বাড়ায়।

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2215. MCQPractice set · Question 67

Planet-এর orbit elliptical হলে speed কোথায় minimum?

a.
aphelion
b.
perihelion
c.
focus
d.
সব জায়গায়

Correct answer: a

Sun থেকে দূরে planet ধীরে চলে।

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2216. MCQPractice set · Question 68

Gravitational force central force হওয়ার ফল কী?

a.
angular momentum conserved
b.
linear speed always constant
c.
energy always zero
d.
mass changes

Correct answer: a

Central force-এর torque about centre zero।

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2217. MCQPractice set · Question 69

Potential energy zero reference পরিবর্তন করলে force বদলায়?

a.
না
b.
হ্যাঁ, দ্বিগুণ
c.
শুধু Earth-এ
d.
force zero হয়

Correct answer: a

Potential-এর additive constant বদলালেও gradient তথা force অপরিবর্তিত থাকে।

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2218. MCQPractice set · Question 70

Gravitational potential difference path-independent?

a.
হ্যাঁ
b.
না
c.
শুধু circular path-এ
d.
শুধু vacuum-এ

Correct answer: a

Gravity conservative force।

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2219. MCQPractice set · Question 71

শেষ পর্যন্ত weight ও mass-এর সবচেয়ে গুরুত্বপূর্ণ পার্থক্য কী?

a.
mass intrinsic, weight=mg location-dependent
b.
দুটিই একই unit
c.
weight scalar নয়
d.
mass force

Correct answer: a

Mass body-এর inertia, weight local gravitational force।

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2220. MCQPractice set · Question 72

Lift downward acceleration g/2 হলে apparent weight কত?

a.
mg/2
b.
2mg
c.
mg
d.
0

Correct answer: a

N=m(g−g/2)=mg/2।

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