Related Questions

A body of mass ‘m’ moving with a constant velocity ‘v’ strikes another body of same mass moving with same velocity but in opposite direction. The common velocity of both the bodies after collision is
A v
B 2v
C 4v
D 8v
The change in length due to a tensile or compressive force acting on a body is given by (where P = Tensile or compressive force acting on the body, $$l$$ = Original length of the body, A = Cross-sectional area of the body and E = Young's modulus for the material of the body)
A $$\frac{{{\text{P}}l{\text{A}}}}{{\text{E}}}$$
B $$\frac{{{\text{P}}l}}{{{\text{AE}}}}$$
C $$\frac{{\text{E}}}{{{\text{P}}l{\text{A}}}}$$
D $$\frac{{{\text{AE}}}}{{{\text{P}}l}}$$
If V, U and Vr represent the absolute velocity of fluid, velocity of blade, and relative velocity of fluid, and suffix ‘I’ and ‘o’ stand for entry and exit conditions, then in a rotary machine whose degree of reaction is unity
A Vi = Vo
B Vt > Vo
C U
D V = Uo
The accelerated growth of public employment -----the dramatic expansion of budgets and programmes.
A parallels
B contains
C revolves
D escapes
আজ পরীক্ষা দিতে আসার সময় তোমার কোনো এক বন্ধুর খুব টেনশন হচ্ছিল। টেনশনে তার হাত-পা ঘামছিল, গলা শুকিয়ে যাচ্ছিল, হৃৎস্পন্দন বেড়ে যাচ্ছিল। এমতাবস্থায়, তার কোন স্নায়ুতন্ত্র কার্যকর ছিল? (One of your friends was in serious tension while coming for exam today. He was sweating, having dry mouth, and his heart beat was accelerated. Which nervous system was in action at that time?)
A ঐচ্ছিক (Somatic)
B কেন্দ্রীয় (Central)
C সমবেদী (Sympathetic)
D পরাসমবেদী (Parasympathetic)
Heart rate is accelerated by
A Hypoxia
B Exercise
C Fear
D Increased baroreceptor activity
E Increased intracranial pressure
The rate of heartbeat is accelerated by the hormone
A adrenaline
B acetylcholine
C thyroxine
D pituitrin
An open vessel of water is accelerated up an inclined plane. The free water surface will
A be horizontal
B make an angle in direction of inclination of inclined plane
C make an angle in opposite direction to inclination of inclined plane
D any one of above is possible
Low temperature oxidation of coal is accelerated by the
A Storage in large heaps
B Storage in compressed piles
C Absence of porous or friable particles
D All of the above
Green house effect is accelerated by
A Deforestation
B Rapid industrialization
C Increased transportation activity
D All of these

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