ম্যাটেরিয়ালস এন্ড মেটালার্জিক্যাল ইঞ্জিনিয়ারিং

1201. MCQPractice set · Question 4

180° কত radian?

a.

π/2

b.

π

c.

2π

d.

π/180

Correct answer: b

180°=π rad।

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1202. MCQPractice set · Question 5

90° কত radian?

a.

π/4

b.

π/2

c.

π

d.

2π

Correct answer: b

90°=π/2 rad।

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1203. MCQPractice set · Question 6

60° কত radian?

a.

π/6

b.

π/4

c.

π/3

d.

2π/3

Correct answer: c

60×π/180=π/3 rad।

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1204. MCQPractice set · Question 7

30° কত radian?

a.

π/6

b.

π/3

c.

π/2

d.

π/12

Correct answer: a

30°=π/6 rad।

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1205. MCQPractice set · Question 8

Angular velocity-এর সংজ্ঞা কী?

a.

linear displacement/time

b.

angular displacement/time

c.

force/time

d.

radius/time

Correct answer: b

Angular velocity ω=dθ/dt।

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1206. MCQPractice set · Question 9

Angular velocity-এর SI unit কোনটি?

a.

m/s

b.

rad/s

c.

rad/s²

d.

Hz/s

Correct answer: b

Angular displacement radian এবং time second, তাই unit rad/s।

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1207. MCQPractice set · Question 10

Angular speed ও angular velocity-এর পার্থক্য কী?

a.

speed scalar, velocity vector

b.

speed vector, velocity scalar

c.

দুটিই scalar

d.

দুটিই unitless

Correct answer: a

Angular speed-এর শুধু magnitude, angular velocity-এর axis direction-ও থাকে।

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1208. MCQPractice set · Question 11

Angular acceleration কী?

a.

dθ/dt

b.

dω/dt

c.

dr/dt

d.

dv/dt only

Correct answer: b

Angular acceleration α=dω/dt=d²θ/dt²।

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1209. MCQPractice set · Question 12

Angular acceleration-এর SI unit কী?

a.

rad/s

b.

rad/s²

c.

m/s²

d.

Hz

Correct answer: b

Angular velocity-এর rate of change, তাই rad/s²।

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1210. MCQPractice set · Question 13

Linear velocity v ও angular velocity ω-এর relation কী?

a.

v=rω

b.

v=ω/r

c.

v=r/ω

d.

v=r+ω

Correct answer: a

Radius r দূরের point-এর tangential speed v=rω।

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