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1911. MCQPractice set · Question 71

20 N horizontal force ও 8 N kinetic friction 4 kg block-এ কাজ করলে acceleration কত?

a.
2 m/s²
b.
3 m/s²
c.
5 m/s²
d.
7 m/s²

Correct answer: b

Net force=12 N; a=12/4=3 m/s²।

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1912. MCQPractice set · Question 72

30 N applied force, limiting friction 30 N হলে block-এর অবস্থা কী?

a.
just about to move
b.
speed maximum
c.
free fall
d.
normal zero

Correct answer: a

Applied force limiting friction-এর সমান হলে impending motion।

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1913. MCQPractice set · Question 73

Applied force limiting friction-এর অর্ধেক হলে static friction কত?

a.
limiting friction-এর অর্ধেক
b.
limiting friction
c.
zero
d.
দ্বিগুণ

Correct answer: a

Static friction প্রয়োজন অনুযায়ী applied force-কে balance করে।

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1914. MCQPractice set · Question 74

Incline θ=30°, μ_k=0.2, g=10; নিচে sliding acceleration কোন formula?

a.
10(sin30°−0.2cos30°)
b.
10(sin30°+0.2cos30°)
c.
10cos30°
d.
2

Correct answer: a

Downward sliding-এ gravity component থেকে friction subtract হয়।

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1915. MCQPractice set · Question 75

Incline θ=30°, μ=1/√3 হলে body just কী করবে?

a.
just slide condition
b.
দ্রুত উপরে যাবে
c.
free fall
d.
normal zero

Correct answer: a

tan30°=1/√3=μ, তাই angle of repose condition।

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1916. MCQPractice set · Question 76

Angle of repose 45° হলে coefficient of friction কত?

a.
0.5
b.
1
c.
√3
d.
0

Correct answer: b

μ=tan45°=1।

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1917. MCQPractice set · Question 77

Angle of repose 30° হলে coefficient কত?

a.
1/√3
b.
√3
c.
1
d.
1/2

Correct answer: a

μ=tan30°=1/√3।

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1918. MCQPractice set · Question 78

Coefficient μ=0.75 হলে angle of repose কোন range-এ?

a.
0° ও 45°-এর মধ্যে
b.
45° ও 90°-এর মধ্যে
c.
90°-এর বেশি
d.
zero

Correct answer: a

tanθ=0.75, তাই θ≈36.9°, যা 45°-এর কম।

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1919. MCQPractice set · Question 79

Incline-এ block rest-এ থাকলে friction-এর direction কীভাবে নির্ধারিত হয়?

a.
downhill tendency-এর বিপরীত
b.
সবসময় downhill
c.
upward vertical
d.
normal direction

Correct answer: a

Static friction সম্ভাব্য sliding-এর বিপরীত দিকে নেয়।

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1920. MCQPractice set · Question 80

Incline-এর angle 90° হলে normal reaction কত?

a.
0
b.
mg
c.
μmg
d.
mg/2

Correct answer: a

N=mg cos90°=0; ideal vertical surface model।

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