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কেমিক্যাল ইঞ্জিনিয়ারিং

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2241. MCQPractice set · Question 93

Earth surface-এ g=0.25g হলে effective weight কী?

a.
original weight-এর 1/4
b.
4 গুণ
c.
অপরিবর্তিত
d.
zero

Correct answer: a

W=mg, তাই g এক-চতুর্থাংশে weight-ও এক-চতুর্থাংশ।

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2242. MCQPractice set · Question 94

Mass 5 kg body-এর Earth weight g=10-এ কত?

a.
50 N
b.
5 N
c.
10 N
d.
500 N

Correct answer: a

W=5×10=50 N।

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2243. MCQPractice set · Question 95

Mass 5 kg body-এর Moon weight g=1.6-এ কত?

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

Correct answer: a

W=5×1.6=8 N।

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2244. MCQPractice set · Question 96

Gravitational field intensity unit mass-এর উপর কী?

a.
force
b.
energy
c.
power
d.
potential

Correct answer: a

g=force per unit mass।

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2245. MCQPractice set · Question 97

একটি body-এর gravitational potential V=-20 J/kg হলে 3 kg body-এর potential energy কত?

a.
−60 J
b.
−20 J
c.
60 J
d.
−6 J

Correct answer: a

U=mV=3×(−20)=−60 J।

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2246. MCQPractice set · Question 98

Potential difference 10 J/kg-এ 4 kg mass সরালে work magnitude কত?

a.
40 J
b.
2.5 J
c.
14 J
d.
100 J

Correct answer: a

Work=m×potential difference=4×10=40 J।

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2247. MCQPractice set · Question 99

শেষ পর্যন্ত এই topic-এর মূল relation কোনটি?

a.
W=mg, U=mV, v_e=√(2GM/R)
b.
W=m/g only
c.
U=GMm/r² only
d.
v_e=GM/R

Correct answer: a

Mass, weight, potential ও escape velocity-এর প্রধান formula এগুলো।

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2248. MCQPractice set · Question 100

Mass-এর dimension কোনটি?

a.
[M]
b.
[MLT⁻²]
c.
[LT⁻²]
d.
[ML²T⁻²]

Correct answer: a

Mass একটি base quantity, তাই dimension [M]।

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2249. MCQPractice set · Question 1

Work কী?

a.
বল ও displacement-এর গুণফলের ভেক্টর মান
b.
শুধু displacement
c.
শুধু force
d.
শুধু time

Correct answer: a

Work হলো force-এর ওপর displacement-এর component-এর উপর কার্যকারী scalar quantity।

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2250. MCQPractice set · Question 2

Work-এর SI unit কী?

a.
joule
b.
newton
c.
watt
d.
metre

Correct answer: a

Work = force × displacement, তাই SI unit joule (J)।

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