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PRACTICE QUESTION BANK

ইন্ডাস্ট্রিয়াল এন্ড প্রোডাকশন ইঞ্জিনিয়ারিং

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811. MCQPractice set · Question 19

A·B=0 হলে angle কত?

a.
b.
45°
c.
90°
d.
180°

Correct answer: c

Non-zero perpendicular vectors-এর angle 90°।

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812. MCQPractice set · Question 20

Work-এর vector formula কোনটি?

a.
W=F·s
b.
W=F×s
c.
W=F+s
d.
W=F/s

Correct answer: a

Constant force-এর work হলো force ও displacement-এর dot product।

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813. MCQPractice set · Question 21

Force displacement-এর perpendicular হলে work কত?

a.
Fs
b.
0
c.
F/s
d.
F+s

Correct answer: b

W=Fs cos90°=0।

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814. MCQPractice set · Question 22

Force ও displacement একই direction-এ হলে work কী?

a.
Fs
b.
0
c.
−Fs
d.
F/s

Correct answer: a

θ=0° হলে W=Fs।

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815. MCQPractice set · Question 23

Force ও displacement opposite direction-এ হলে work কী?

a.
Fs
b.
−Fs
c.
0
d.
F+s

Correct answer: b

θ=180° হলে W=Fs cos180°=−Fs।

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816. MCQPractice set · Question 24

একটি force 10 N এবং displacement 2 m একই direction-এ হলে work কত?

a.
5 J
b.
12 J
c.
20 J
d.
0 J

Correct answer: c

W=Fs=10×2=20 J।

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817. MCQPractice set · Question 25

F=10 N, s=2 m এবং angle 60° হলে work কত?

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

Correct answer: a

W=Fs cos60°=10×2×1/2=10 J।

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818. MCQPractice set · Question 26

একটি vector A=3î+4ĵ এবং B=2î−ĵ হলে A·B কত?

a.
2
b.
−2
c.
10
d.
14

Correct answer: a

A·B=3×2+4×(−1)=6−4=2।

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819. MCQPractice set · Question 27

A=2î+3ĵ এবং B=4î+ĵ হলে A·B কত?

a.
7
b.
11
c.
8
d.
14

Correct answer: b

A·B=2×4+3×1=11।

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820. MCQPractice set · Question 28

A=î+ĵ এবং B=î−ĵ হলে A·B কত?

a.
2
b.
1
c.
0
d.
−2

Correct answer: c

A·B=1×1+1×(−1)=0; vectors perpendicular।

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