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ইন্ডাস্ট্রিয়াল এন্ড প্রোডাকশন ইঞ্জিনিয়ারিং

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2071. MCQPractice set · Question 28

Gravitational potential-এর SI unit কী?

a.
J/kg
b.
N/kg
c.
N·m²/kg²
d.
J·kg

Correct answer: a

Potential energy per unit mass-এর unit J/kg।

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2072. MCQPractice set · Question 29

Point mass-এর gravitational potential কী?

a.
−GM/r
b.
GM/r²
c.
GMm/r²
d.
−GMr

Correct answer: a

Unit mass-এর potential V=−GM/r।

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2073. MCQPractice set · Question 30

Gravitational potential energy-এর formula কী?

a.
−GMm/r
b.
GMm/r²
c.
GM/r
d.
mgh²

Correct answer: a

দুটি mass-এর gravitational potential energy U=−GMm/r।

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2074. MCQPractice set · Question 31

Gravitational potential energy negative কেন?

a.
infinity-তে zero reference থেকে bound state
b.
energy নেই
c.
mass negative
d.
force repulsive

Correct answer: a

Attraction-এর জন্য bound অবস্থার energy infinity reference-এর তুলনায় negative।

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2075. MCQPractice set · Question 32

Gravitational field conservative কি?

a.
হ্যাঁ
b.
না
c.
শুধু equator-এ
d.
শুধু vacuum-এ নয়

Correct answer: a

Gravity-এর কাজ path-independent; তাই এটি conservative field।

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2076. MCQPractice set · Question 33

Closed path-এ gravitational force-এর work কত?

a.
0
b.
mgh
c.
GMm/r
d.
infinite

Correct answer: a

Conservative force-এর closed path work zero।

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2077. MCQPractice set · Question 34

Gravity-এর potential energy change path-এর উপর নির্ভর করে?

a.
না, initial ও final position-এর উপর
b.
হ্যাঁ সবসময়
c.
শুধু circular path-এ
d.
শুধু mass-এর উপর

Correct answer: a

Conservative field হওয়ায় potential difference path-independent।

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2078. MCQPractice set · Question 35

Height h-এর ছোট পরিবর্তনে gravitational potential energy change কী?

a.
mgh
b.
GMm/h²
c.
mg/h
d.
mh/g

Correct answer: a

Near Earth constant g-তে ΔU=mgΔh।

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2079. MCQPractice set · Question 36

Escape velocity-এর formula কী?

a.
√(2GM/R)
b.
√(GM/R)
c.
GM/R²
d.
2GM/R

Correct answer: a

Infinity-তে final speed zero ধরে energy conservation করলে v_e=√(2GM/R)।

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2080. MCQPractice set · Question 37

Escape velocity কি body-এর mass-এর উপর নির্ভর করে?

a.
না
b.
হ্যাঁ, সরাসরি
c.
mass-এর square
d.
শুধু heavy body-তে

Correct answer: a

v_e=√(2GM/R); projectile mass cancel হয়ে যায়।

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