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কেমিক্যাল ইঞ্জিনিয়ারিং

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1641. MCQPractice set · Question 4

একই direction-এর 5 N ও 7 N parallel forces-এর resultant কত?

a.
2 N
b.
12 N
c.
35 N
d.
0

Correct answer: b

Like parallel forces যোগ হয়: 5+7=12 N।

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1642. MCQPractice set · Question 5

বিপরীত direction-এর 10 N ও 6 N parallel forces-এর resultant কত?

a.
4 N বড় force-এর দিকে
b.
16 N
c.
60 N
d.
0

Correct answer: a

Unlike parallel forces-এর resultant difference, 4 N বড় force-এর direction-এ।

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1643. MCQPractice set · Question 6

Equal opposite parallel forces-এর resultant কী?

a.
zero force
b.
2F
c.
F
d.
infinite

Correct answer: a

Equal opposite forces cancel করে।

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1644. MCQPractice set · Question 7

Equal opposite parallel forces একই line-এ না হলে কী তৈরি হয়?

a.
couple
b.
single force
c.
zero torque সবসময়
d.
weight

Correct answer: a

Equal opposite non-collinear forces-এর resultant zero হলেও moment থাকে; এটি couple।

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1645. MCQPractice set · Question 8

Couple-এর resultant force কত?

a.
0
b.
F
c.
2F
d.
Fd

Correct answer: a

Couple-এর দুই equal opposite force vectorially cancel করে।

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1646. MCQPractice set · Question 9

Couple-এর moment কত?

a.
F×perpendicular separation
b.
F/separation
c.
2F only
d.
zero

Correct answer: a

Couple moment = one force × arm বা perpendicular distance।

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1647. MCQPractice set · Question 10

Couple body-তে কী effect সৃষ্টি করে?

a.
pure rotation
b.
pure translation
c.
zero motion always
d.
free fall

Correct answer: a

Resultant force zero কিন্তু torque non-zero, তাই pure rotation হয়।

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1648. MCQPractice set · Question 11

Moment of a force-এর formula কী?

a.
F×perpendicular distance
b.
F/d
c.
Fd²
d.
F+d

Correct answer: a

τ=F×lever arm।

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1649. MCQPractice set · Question 12

Moment-এর SI unit কী?

a.
N·m
b.
N/m
c.
J/s
d.
kg/s

Correct answer: a

Torque বা moment-এর unit newton-metre।

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1650. MCQPractice set · Question 13

Force-এর line of action pivot দিয়ে গেলে moment কত?

a.
0
b.
F
c.
Fd maximum
d.
infinite

Correct answer: a

Perpendicular distance zero, তাই moment zero।

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