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PRACTICE QUESTION BANK

টেক্সটাইল ইঞ্জিনিয়ারিং

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2271. MCQPractice set · Question 23

A 20 N force acts at 30° to motion over 10 m. Work = ?

a.
173.2 J
b.
200 J
c.
100 J
d.
50 J

Correct answer: a

W = 20×10×cos30° ≈ 173.2 J।

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2272. MCQPractice set · Question 24

A 30 N force acts at 90° to displacement. Work = ?

a.
0 J
b.
30 J
c.
300 J
d.
-30 J

Correct answer: a

cos90°=0 so work zero.

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2273. MCQPractice set · Question 25

A 40 W machine does how much work in 5 s?

a.
200 J
b.
40 J
c.
8 J
d.
2000 J

Correct answer: a

W = Pt = 40×5 = 200 J।

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2274. MCQPractice set · Question 26

3 kg ভরের বস্তুর বেগ 3 m/s হলে kinetic energy কত?

a.
13.5 J
b.
9.0 J
c.
1.5 J
d.
9.0 J

Correct answer: a

K = ½mv² = ½×3×3² = 13.5 J।

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2275. MCQPractice set · Question 27

4 kg ভরবিশিষ্ট বস্তুকে 4 m উপরে উঠালে potential energy change কত, g=10?

a.
160 J
b.
40 J
c.
40 J
d.
16 J

Correct answer: a

ΔU = mgh = 4×10×4 = 160 J।

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2276. MCQPractice set · Question 28

370 J কাজ 8 s-এ সম্পন্ন হলে power কত?

a.
46.2 W
b.
2960.0 W
c.
23.1 W
d.
8 W

Correct answer: a

P = W/t = 370/8 = 46.2 W।

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2277. MCQPractice set · Question 29

25 N বল 2 m displacement-এ 90° কোণে কাজ করে। কাজ কত?

a.
0.0 J
b.
50.0 J
c.
12.5 J
d.
0 J

Correct answer: a

Work = Fs cos90° = 25×2×cos90° = 0.0 J।

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2278. MCQPractice set · Question 30

7 kg ভরের বস্তুর বেগ 7 m/s হলে kinetic energy কত?

a.
171.5 J
b.
49.0 J
c.
3.5 J
d.
49.0 J

Correct answer: a

K = ½mv² = ½×7×7² = 171.5 J।

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2279. MCQPractice set · Question 31

3 kg ভরবিশিষ্ট বস্তুকে 4 m উপরে উঠালে potential energy change কত, g=10?

a.
120 J
b.
30 J
c.
40 J
d.
12 J

Correct answer: a

ΔU = mgh = 3×10×4 = 120 J।

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2280. MCQPractice set · Question 32

410 J কাজ 8 s-এ সম্পন্ন হলে power কত?

a.
51.2 W
b.
3280.0 W
c.
25.6 W
d.
8 W

Correct answer: a

P = W/t = 410/8 = 51.2 W।

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