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টেক্সটাইল ইঞ্জিনিয়ারিং

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1021. MCQPractice set · Question 88

একটি body-এর velocity 5 m/s থেকে 15 m/s হয় 2 s-এ। acceleration কত?

a.
2 m/s²
b.
5 m/s²
c.
10 m/s²
d.
20 m/s²

Correct answer: b

a=(15−5)/2=5 m/s²।

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1022. MCQPractice set · Question 89

একটি body-এর velocity 15 m/s থেকে 5 m/s হয় 2 s-এ। acceleration কত?

a.
−5 m/s²
b.
5 m/s²
c.
−10 m/s²
d.
10 m/s²

Correct answer: a

a=(5−15)/2=−5 m/s²।

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1023. MCQPractice set · Question 90

একটি body rest থেকে 5 m/s² acceleration-এ 4 s চললে velocity কত?

a.
5 m/s
b.
10 m/s
c.
20 m/s
d.
25 m/s

Correct answer: c

v=at=5×4=20 m/s।

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1024. MCQPractice set · Question 91

একই body 4 s-এ displacement কত?

a.
20 m
b.
40 m
c.
50 m
d.
80 m

Correct answer: c

s=½at²=½×5×16=40 m; তাই সঠিক option b।

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1025. MCQPractice set · Question 92

u=0, a=5 m/s², t=4 s হলে displacement কত?

a.
20 m
b.
40 m
c.
50 m
d.
80 m

Correct answer: b

s=½×5×4²=40 m।

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1026. MCQPractice set · Question 93

v²=u²+2as equation-এ time কেন নেই?

a.
time eliminate করা হয়েছে
b.
time zero
c.
time unitless
d.
acceleration zero

Correct answer: a

প্রথম দুই equation combine করে t বাদ দিলে third equation পাওয়া যায়।

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1027. MCQPractice set · Question 94

Constant acceleration-এর ক্ষেত্রে average velocity কখন (u+v)/2?

a.
সবসময়
b.
শুধু rest-এ
c.
শুধু zero acceleration-এ
d.
কখনো নয়

Correct answer: a

Uniformly accelerated motion-এ velocity linearly পরিবর্তিত হয়, তাই arithmetic mean প্রযোজ্য।

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1028. MCQPractice set · Question 95

একটি object-এর displacement 20 m এবং time 4 s হলে average velocity কত?

a.
5 m/s in displacement direction
b.
80 m/s
c.
0
d.
16 m/s

Correct answer: a

v_avg=20/4=5 m/s, direction displacement-এর direction।

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1029. MCQPractice set · Question 96

Total distance 50 m এবং time 10 s হলে average speed কত?

a.
5 m/s
b.
10 m/s
c.
40 m/s
d.
500 m/s

Correct answer: a

Average speed=50/10=5 m/s।

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1030. MCQPractice set · Question 97

একটি body প্রথম 2 s-এ 10 m এবং পরের 2 s-এ 20 m অতিক্রম করলে average speed কত?

a.
5 m/s
b.
7.5 m/s
c.
10 m/s
d.
15 m/s

Correct answer: b

Total distance=30 m, total time=4 s, তাই average speed=7.5 m/s।

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