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ম্যাটেরিয়ালস এন্ড মেটালার্জিক্যাল ইঞ্জিনিয়ারিং

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1741. MCQPractice set · Question 1

Conservation of momentum-এর মূল শর্ত কী?

a.
net external force zero
b.
internal force zero
c.
mass zero
d.
velocity zero

Correct answer: a

External force বা impulse zero হলে isolated system-এর total momentum conserved।

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1742. MCQPractice set · Question 2

Momentum একটি কোন ধরনের quantity?

a.
vector
b.
scalar
c.
dimensionless
d.
constant always

Correct answer: a

p=mv এবং velocity vector, তাই momentum vector।

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1743. MCQPractice set · Question 3

Momentum-এর formula কী?

a.
p=mv
b.
p=m/v
c.
p=ma
d.
p=F/t

Correct answer: a

Linear momentum mass ও velocity-এর product।

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1744. MCQPractice set · Question 4

Momentum-এর SI unit কোনটি?

a.
kg·m/s
b.
N
c.
J
d.
kg·m/s²

Correct answer: a

p=mv-এর unit kg·m/s।

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1745. MCQPractice set · Question 5

Momentum conservation equation কোনটি?

a.
total initial momentum=total final momentum
b.
initial force=final force
c.
initial energy=final force
d.
mass always doubles

Correct answer: a

Isolated system-এ Σp_before=Σp_after।

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1746. MCQPractice set · Question 6

External force zero হলে total momentum কী?

a.
constant
b.
zero necessarily
c.
infinite
d.
decreasing always

Correct answer: a

F_ext=dp_total/dt=0, তাই total momentum constant।

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1747. MCQPractice set · Question 7

Internal forces total momentum-এ কী effect করে?

a.
pairwise cancel করে
b.
সবসময় বাড়ায়
c.
সবসময় কমায়
d.
mass বদলায়

Correct answer: a

Newton's third law-এর কারণে internal force pairs equal opposite।

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1748. MCQPractice set · Question 8

দুই body collision-এর আগে total momentum 20 kg·m/s হলে পরে কত?

a.
10
b.
20
c.
40
d.
0 সবসময়

Correct answer: b

External impulse না থাকলে total momentum 20-ই থাকে।

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1749. MCQPractice set · Question 9

Perfectly inelastic collision-এ bodies কী করে?

a.
লেগে গিয়ে common velocity-তে চলে
b.
সবসময় আলাদা হয়
c.
kinetic energy বাড়ায়
d.
momentum হারায়

Correct answer: a

Perfectly inelastic collision-এ bodies stick together।

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1750. MCQPractice set · Question 10

Elastic collision-এ কোন দুটি conserved?

a.
momentum ও kinetic energy
b.
শুধু force
c.
শুধু power
d.
শুধু speed of each body

Correct answer: a

Ideal elastic collision-এ momentum ও kinetic energy উভয় conserved।

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