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কোন এক বৃষ্টির দিনে ফাউজিয়া জানালার পাশে দাঁড়িয়ে দেখছিল বৃষ্টি উলম্বভাবে 6 km/hr বেগে পতিত হচ্ছে। ফাউজিয়া লক্ষ্য করল, রাস্তায় একজন লোক 4 km/hr বেগে হাঁটছে এবং অপরজন 8 km/hr বেগে সাইকেলে যাচ্ছে। হেঁটে চলা লোকটির সাপেক্ষে পড়ন্ত বৃষ্টির লব্ধি বেগ কত? (On a rainy day, Faoziya observed that rain was falling with a vertical velocity of 6 km/hr. She also saw that a person was walking with 4 km/hr and another person was riding a bi- cycle with 8 km/hr. What is the resultant velocity of rain with respect to the walking person?)
A -7.016 km/hr
B 9.01 km/hr
C 8.21 km/hr
D 7.21 km/hr
E 7.0 km/hr
In the Newton's law range, the terminal velocity of a solid spherical particle falling through a stationary fluid mass is __________ the fluid viscosity.
A Directly proportional to
B Inversely proportional to
C Inversely proportional to the square root of
D Independent of
In Newton's law range, the terminal velocity of a solid spherical particle falling through a stationary fluid mass varies as the __________ of its diameter.
A Inverse
B Square root
C Second power
D First power
The terminal velocity of a solid spherical particle falling through a stationary fluid mass in the Stoke's law range is proportional to the
A Inverse of fluid viscosity
B Square of particle size
C Difference in the densities of the particle & fluid
D All of the above
The terminal voltage of a D.C. shunt generator drops on load because of all of the following reasons except
A Armature reaction
B Armature resistance drop
C Field weakening due to armature reaction and armature
D Commutation
Rain drops are spherical because of
A viscosity
B air resistance
C surface tension forces
D atmospheric pressure
If Dust is called Air, Air is called Fire, Fire is called Water, Water is called Colour, Colour is called Rain and Rain is called Dust, where do Fish live ?
A Dust
B Fire
C Colour
D Water
When sunlight passes through tiny suspended rain drops it produces ---
A Rainbow
B White light
C Ultraviolet ray
D None
For a sphere falling in the constant drag co-efficient regime, its terminal velocity depends on its diameter (d) as
A d
B $$\sqrt {\text{d}} $$
C d2
D $$\frac{1}{{\text{d}}}$$
Falling drops of water become spheres due to the property of
A adhesion
B cohesion
C surface tension
D viscosity

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