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ফুড ইঞ্জিনিয়ারিং

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1591. MCQPractice set · Question 55

লিফট downward acceleration a হলে passenger-এর normal reaction কী?

a.
m(g−a)
b.
m(g+a)
c.
ma/g
d.
mg+a

Correct answer: a

Downward equation mg−N=ma থেকে N=m(g−a)।

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1592. MCQPractice set · Question 56

Lift constant velocity-তে চললে normal reaction কত?

a.
mg
b.
m(g+a)
c.
m(g−a)
d.
0

Correct answer: a

Constant velocity মানে acceleration zero, তাই N=mg।

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1593. MCQPractice set · Question 57

Inclined plane-এ frictionless block-এর normal reaction কত?

a.
mg cosθ
b.
mg sinθ
c.
mg tanθ
d.
mg

Correct answer: a

Weight-এর normal component mg cosθ, তাই N=mg cosθ।

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1594. MCQPractice set · Question 58

Inclined plane-এ frictionless block-এর acceleration plane বরাবর কত?

a.
g sinθ
b.
g cosθ
c.
g
d.
0

Correct answer: a

Plane বরাবর weight component mg sinθ; a=g sinθ।

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1595. MCQPractice set · Question 59

θ=30° frictionless incline-এ acceleration কত, g=10?

a.
5 m/s²
b.
5√3 m/s²
c.
10 m/s²
d.
20 m/s²

Correct answer: a

a=g sin30°=5 m/s²।

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1596. MCQPractice set · Question 60

Newton's laws কোন frame-এ সরাসরি প্রযোজ্য?

a.
inertial frame
b.
যেকোনো accelerating frame without correction
c.
শুধু rotating frame
d.
শুধু rest frame

Correct answer: a

Inertial frame-এ pseudo force ছাড়াই Newton's laws প্রযোজ্য।

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1597. MCQPractice set · Question 61

Non-inertial frame-এ Newton's second law ব্যবহার করতে কী যোগ করতে হয়?

a.
pseudo force
b.
mass remove
c.
gravity remove
d.
time remove

Correct answer: a

Frame acceleration-এর effect account করতে pseudo force যোগ করা হয়।

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1598. MCQPractice set · Question 62

Newton's first law কোন law-এর special case?

a.
second law with F=0
b.
third law
c.
gravitation law
d.
energy law

Correct answer: a

F=ma-তে F=0 হলে a=0, যা first law-এর result।

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1599. MCQPractice set · Question 63

Momentum conserved হওয়ার condition কী?

a.
net external force zero
b.
internal force zero
c.
mass zero
d.
velocity zero

Correct answer: a

F_ext=dp_total/dt; external force zero হলে total momentum constant।

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1600. MCQPractice set · Question 64

Collision-এ internal action-reaction forces কী করে?

a.
total momentum-এর পরিবর্তন cancel করে
b.
momentum সবসময় দ্বিগুণ করে
c.
mass destroy করে
d.
gravity cancel করে

Correct answer: a

Internal forces equal opposite হওয়ায় isolated system-এর total momentum unchanged।

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