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টেক্সটাইল ইঞ্জিনিয়ারিং

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2111. MCQPractice set · Question 68

Effective g কোথায় কম?

a.
equator
b.
poles
c.
centre নয়
d.
সবচেয়ে দূরের star

Correct answer: a

Equator-এ rotation-এর centrifugal effect maximum।

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2112. MCQPractice set · Question 69

Gravitational field zero হতে পারে কিন্তু potential non-zero?

a.
হ্যাঁ
b.
না
c.
শুধু infinity-তে
d.
শুধু vacuum-এ

Correct answer: a

Earth centre-এ field zero হলেও potential finite negative।

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2113. MCQPractice set · Question 70

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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2114. MCQPractice set · Question 71

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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2115. MCQPractice set · Question 72

Gravitational potential energy-এর formula কী?

a.
−GMm/r
b.
GMm/r²
c.
GM/r
d.
mgh²

Correct answer: a

দুটি mass-এর U=−GMm/r।

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2116. MCQPractice set · Question 73

Gravitational potential energy negative কেন?

a.
infinity 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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2117. MCQPractice set · Question 74

Closed path-এ gravitational force-এর work কত?

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

Correct answer: a

Gravity conservative force, তাই closed path work zero।

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2118. MCQPractice set · Question 75

একটি 2 kg body-কে 5 m তোলা হলে g=10-এ potential energy gain কত?

a.
10 J
b.
50 J
c.
100 J
d.
25 J

Correct answer: c

ΔU=mgh=2×10×5=100 J।

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2119. MCQPractice set · Question 76

Escape velocity-এর formula কী?

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

Correct answer: a

Energy conservation থেকে v_e=√(2GM/R)।

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2120. MCQPractice set · Question 77

Escape velocity কি projectile mass-এর উপর নির্ভর করে?

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

Correct answer: a

Energy equation-এ projectile mass cancel হয়।

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