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ম্যাটেরিয়ালস এন্ড মেটালার্জিক্যাল ইঞ্জিনিয়ারিং

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1061. MCQPractice set · Question 128

একটি body-এর speed constant কিন্তু direction পরিবর্তিত হলে motion কেমন?

a.
uniform velocity নয়
b.
rest
c.
uniform velocity
d.
zero acceleration

Correct answer: a

Velocity direction বদলেছে, তাই velocity uniform নয়; circular motion উদাহরণ।

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1062. MCQPractice set · Question 129

শেষে, kinematics মূলত কোন বিষয় নিয়ে আলোচনা করে?

a.
motion without focusing on causes
b.
শুধু force
c.
শুধু energy
d.
শুধু mass

Correct answer: a

Kinematics position, velocity ও acceleration দিয়ে motion বর্ণনা করে; force-এর কারণ dynamics-এ আসে।

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1063. MCQPractice set · Question 1

Projectile বলতে কী বোঝায়?

a.
শুধু horizontal motion
b.
gravity-এর অধীনে নিক্ষিপ্ত body
c.
শুধু circular motion
d.
resting body

Correct answer: b

Air resistance উপেক্ষা করলে gravity-এর অধীনে চলা নিক্ষিপ্ত body projectile।

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1064. MCQPractice set · Question 2

Ideal projectile motion-এ horizontal acceleration কত?

a.
g
b.
0
c.
u
d.
g/2

Correct answer: b

Gravity vertical direction-এ কাজ করে, তাই horizontal acceleration zero।

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1065. MCQPractice set · Question 3

Ideal projectile motion-এ vertical acceleration কত?

a.
0
b.
g downward
c.
g upward
d.
u

Correct answer: b

Gravity-এর জন্য vertical acceleration g downward।

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1066. MCQPractice set · Question 4

Projectile-এর horizontal velocity কী?

a.
u cosθ
b.
u sinθ
c.
gt
d.
zero

Correct answer: a

Initial velocity u এবং projection angle θ হলে horizontal component u cosθ এবং constant।

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1067. MCQPractice set · Question 5

Projectile-এর initial vertical velocity কী?

a.
u cosθ
b.
u sinθ
c.
gt
d.
u tanθ

Correct answer: b

Initial vertical component uᵧ=u sinθ।

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1068. MCQPractice set · Question 6

Projectile-এর horizontal displacement x কত?

a.
u cosθ·t
b.
u sinθ·t
c.
½gt²
d.
ut²

Correct answer: a

Horizontal velocity constant, তাই x=u cosθ·t।

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1069. MCQPractice set · Question 7

Projectile-এর vertical displacement y কত?

a.
u cosθ·t
b.
u sinθ·t−½gt²
c.
gt²
d.
u/t

Correct answer: b

Vertical motion-এ y=u sinθ·t−½gt²।

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1070. MCQPractice set · Question 8

Projectile-এর trajectory equation কোনটি?

a.
y=x tanθ−gx²/(2u²cos²θ)
b.
y=x+ut
c.
y=gt²
d.
x=y tanθ

Correct answer: a

সময় eliminate করলে projectile-এর parabolic trajectory equation পাওয়া যায়।

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