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টেক্সটাইল ইঞ্জিনিয়ারিং

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2181. MCQPractice set · Question 33

Gravity-এর work ও potential energy change-এর relation কী?

a.
W_g=−ΔU
b.
W_g=ΔU সবসময়
c.
W_g=U²
d.
W_g=0 সবসময়

Correct answer: a

Conservative force-এর জন্য W=−ΔU।

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2182. MCQPractice set · Question 34

Gravitational field intensity-এর unit আর কোনটির সমান?

a.
m/s²
b.
J/kg²
c.
kg/N
d.
N·m

Correct answer: a

N/kg=(kg·m/s²)/kg=m/s²।

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2183. MCQPractice set · Question 35

একটি body-এর weight Earth-এ 60 N হলে g=10-এ mass কত?

a.
6 kg
b.
60 kg
c.
600 kg
d.
0.6 kg

Correct answer: a

m=W/g=60/10=6 kg।

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2184. MCQPractice set · Question 36

Moon-এ g=1.6 m/s², mass 5 kg হলে weight কত?

a.
8 N
b.
5 N
c.
16 N
d.
50 N

Correct answer: a

W=mg=5×1.6=8 N।

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2185. MCQPractice set · Question 37

একটি body-এর mass 10 kg হলে Moon-এ mass কত?

a.
10 kg
b.
10/6 kg
c.
60 kg
d.
0

Correct answer: a

Mass location-independent।

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2186. MCQPractice set · Question 38

Satellite-এর energy radius বাড়লে কী হয়?

a.
কম negative হয়
b.
আরও negative হয়
c.
zero সবসময়
d.
অপরিবর্তিত

Correct answer: a

Orbital E=−GMm/(2r); r বাড়লে energy বাড়ে।

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2187. MCQPractice set · Question 39

Gravitational force-এর কাজ circular orbit-এ কত?

a.
instantaneous zero
b.
সবসময় positive
c.
সবসময় negative
d.
GMm/r²

Correct answer: a

Gravity radial এবং circular displacement tangential, তাই work zero।

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2188. MCQPractice set · Question 40

শেষ পর্যন্ত mass, weight, potential ও escape velocity topic-এর ভিত্তি কোনটি?

a.
gravity এবং energy conservation
b.
শুধু friction
c.
শুধু pressure
d.
শুধু temperature

Correct answer: a

Weight ও potential gravity থেকে, escape velocity energy conservation থেকে আসে।

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2189. MCQPractice set · Question 41

W=98 N, g=9.8 m/s² হলে mass কত?

a.
10 kg
b.
9.8 kg
c.
98 kg
d.
1 kg

Correct answer: a

m=W/g=98/9.8=10 kg।

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2190. MCQPractice set · Question 42

Mass 20 kg, g=10 হলে weight কত?

a.
200 N
b.
20 N
c.
2 N
d.
200 kg

Correct answer: a

W=mg=20×10=200 N।

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