সিভিল ইঞ্জিনিয়ারিং

1271. MCQPractice set · Question 74

Angular speed 10 rad/s হলে period কত?

a.

10π s

b.

π/5 s

c.

5π s

d.

2π s

Correct answer: b

T=2π/ω=2π/10=π/5 s।

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1272. MCQPractice set · Question 75

Frequency 4 Hz হলে period কত?

a.

4 s

b.

1/4 s

c.

2π s

d.

π/4 s

Correct answer: b

T=1/f=1/4 s।

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1273. MCQPractice set · Question 76

একটি point 2 m radius-এ 6 m/s speed-এ ঘুরলে ω কত?

a.

3 rad/s

b.

12 rad/s

c.

8 rad/s

d.

1/3 rad/s

Correct answer: a

ω=v/r=6/2=3 rad/s।

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1274. MCQPractice set · Question 77

একটি point-এর ω=5 rad/s এবং r=0.4 m হলে v কত?

a.

1 m/s

b.

2 m/s

c.

5.4 m/s

d.

12.5 m/s

Correct answer: b

v=rω=0.4×5=2 m/s।

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1275. MCQPractice set · Question 78

একটি wheel-এর radius 0.5 m, 2 revolution/s হলে rim speed কত?

a.

π m/s

b.

2π m/s

c.

4π m/s

d.

0.5π m/s

Correct answer: b

ω=2πf=4π rad/s; v=rω=0.5×4π=2π m/s।

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1276. MCQPractice set · Question 79

একটি wheel-এর radius 1 m, 1 revolution/s হলে rim speed কত?

a.

1 m/s

b.

π m/s

c.

2π m/s

d.

4π m/s

Correct answer: c

এক revolution-এর circumference 2πr=2π m প্রতি second।

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1277. MCQPractice set · Question 80

একটি rotating body-এর angular displacement 12 rad in 3 s হলে average angular speed কত?

a.

3 rad/s

b.

4 rad/s

c.

9 rad/s

d.

36 rad/s

Correct answer: b

ω_avg=θ/t=12/3=4 rad/s।

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1278. MCQPractice set · Question 81

Angular displacement 20 rad in 5 s হলে average angular velocity-এর magnitude কত?

a.

2 rad/s

b.

4 rad/s

c.

5 rad/s

d.

25 rad/s

Correct answer: b

20/5=4 rad/s।

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1279. MCQPractice set · Question 82

Angular acceleration constant হলে angular velocity-এর equation কী?

a.

ω=ω₀+αt

b.

ω=ω₀t²

c.

ω=α/t

d.

ω=rα

Correct answer: a

Linear v=u+at-এর rotational analogue ω=ω₀+αt।

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1280. MCQPractice set · Question 83

Constant angular acceleration-এ angular displacement-এর equation কী?

a.

θ=ω₀t+½αt²

b.

θ=ω₀+αt

c.

θ=rω

d.

θ=α/t

Correct answer: a

Rotational kinematics-এ θ=ω₀t+½αt²।

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