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PRACTICE QUESTION BANK

আর্কিটেকচার

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2261. MCQPractice set · Question 13

বল displacement-এর বিপরীত দিকে হলে কাজ কী?

a.
negative
b.
positive
c.
zero
d.
infinite

Correct answer: a

θ = 180° হলে cosθ = -1, তাই negative work।

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2262. MCQPractice set · Question 14

একটি 60 W bulb প্রতি সেকেন্ডে কত joule energy খরচ করে?

a.
60 J
b.
6 J
c.
600 J
d.
3600 J

Correct answer: a

60 W = 60 J/s।

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2263. MCQPractice set · Question 15

200 J work 10 s-এ সম্পন্ন হলে power কত?

a.
20 W
b.
2 W
c.
200 W
d.
10 W

Correct answer: a

P = W/t = 200/10 = 20 W।

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2264. MCQPractice set · Question 16

একটি 2 kg বস্তুর velocity 3 m/s হলে kinetic energy কত?

a.
9 J
b.
18 J
c.
6 J
d.
12 J

Correct answer: a

K = ½×2×9 = 9 J।

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2265. MCQPractice set · Question 17

একটি 5 kg বস্তুকে 2 m উপরে উঠালে potential energy change কত, g=10?

a.
100 J
b.
50 J
c.
25 J
d.
10 J

Correct answer: a

ΔU = mgh = 5×10×2 = 100 J।

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2266. MCQPractice set · Question 18

Efficiency কী?

a.
output/ input × 100%
b.
input/output × 100%
c.
power × time
d.
mass × velocity

Correct answer: a

Efficiency = useful output ÷ total input × 100%.

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2267. MCQPractice set · Question 19

Machine-এর efficiency কখন 100% হয়?

a.
কোনো loss না থাকলে
b.
সমস্ত input হারিয়ে গেলে
c.
যখন velocity zero
d.
যখন force zero

Correct answer: a

Ideal machine-এ loss নেই, তাই efficiency 100%।

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2268. MCQPractice set · Question 20

A 2 kg object is lifted 3 m in 2 s. Power = ?

a.
30 W
b.
15 W
c.
60 W
d.
6 W

Correct answer: a

W = mgh = 2×10×3 = 60 J; P = 60/2 = 30 W।

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2269. MCQPractice set · Question 21

A 4 kg object falls 5 m freely. Work by gravity = ?

a.
200 J
b.
20 J
c.
40 J
d.
100 J

Correct answer: a

W = mgh = 4×10×5 = 200 J।

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2270. MCQPractice set · Question 22

A 10 N force causes displacement 2 m in same direction. Work = ?

a.
20 J
b.
2 J
c.
10 J
d.
0 J

Correct answer: a

W = 10×2 = 20 J।

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