ম্যাটেরিয়ালস এন্ড মেটালার্জিক্যাল ইঞ্জিনিয়ারিং

1011. MCQPractice set · Question 78

Velocity zero হলেও acceleration non-zero হতে পারে?

a.

হ্যাঁ, highest point-এ thrown body-এর মতো

b.

না

c.

শুধু uniform motion-এ

d.

কখনো নয়

Correct answer: a

Instant-এ velocity zero হলেও gravity acceleration non-zero থাকতে পারে।

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1012. MCQPractice set · Question 79

Acceleration zero হলেও object-এর position কী হতে পারে?

a.

constant velocity-তে চলতে পারে

b.

অবশ্যই rest

c.

অবশ্যই circular

d.

শুধু negative

Correct answer: a

Zero acceleration মানে velocity constant; velocity non-zero হলে object চলবে।

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1013. MCQPractice set · Question 80

একটি body 5 m/s বেগে 4 s চললে uniform motion-এ distance কত?

a.

1.25 m

b.

9 m

c.

20 m

d.

25 m

Correct answer: c

s=vt=5×4=20 m।

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1014. MCQPractice set · Question 81

একটি body 72 km/h speed-এ চললে SI speed কত?

a.

10 m/s

b.

20 m/s

c.

36 m/s

d.

72 m/s

Correct answer: b

72×5/18=20 m/s।

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1015. MCQPractice set · Question 82

একটি body 10 m/s speed-এ চললে km/h-এ কত?

a.

18 km/h

b.

36 km/h

c.

72 km/h

d.

10 km/h

Correct answer: b

10×18/5=36 km/h।

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1016. MCQPractice set · Question 83

Velocity-এর dimension কোনটি?

a.

[L]

b.

[LT⁻¹]

c.

[LT⁻²]

d.

[MLT⁻¹]

Correct answer: b

Velocity=displacement/time, তাই [LT⁻¹]।

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1017. MCQPractice set · Question 84

Acceleration-এর dimension কোনটি?

a.

[LT⁻¹]

b.

[LT⁻²]

c.

[MLT⁻²]

d.

[L²T⁻¹]

Correct answer: b

Acceleration=velocity/time, তাই [LT⁻²]।

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1018. MCQPractice set · Question 85

Uniform circular motion-এ tangential acceleration কত?

a.

zero

b.

v²/r

c.

vr

d.

r/v

Correct answer: a

Speed constant হওয়ায় tangential acceleration zero; direction change-এর জন্য centripetal acceleration থাকে।

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1019. MCQPractice set · Question 86

Velocity change-এর vector formula কোনটি?

a.

Δv=v−u

b.

Δv=v+u সবসময়

c.

Δv=vu

d.

Δv=v/u

Correct answer: a

Final velocity minus initial velocity হলো change in velocity।

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1020. MCQPractice set · Question 87

Average acceleration-এর formula কী?

a.

(v−u)/Δt

b.

(v+u)/Δt

c.

distance/time

d.

force×time

Correct answer: a

Average acceleration=change in velocity/elapsed time।

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