Q. For a fully-developed pipe flow, how does the pressure vary with the length of the pipe?

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Q. When a problem states “The velocity of the water flow in a pipe is 20 m/s”, which of the following velocities is it talking about?

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Q. Which of the factors primarily decide whether the flow in a circular pipe is laminar or turbulent?

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Q. How is Reynolds number defined as?

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Q. A circular pipe of radius 7 cm is used for water flow transmission. This pipe is moulded into another pipe with a square cross-section keeping the length same. (Ignore the thickness of the pipe). Calculate the hydraulic diameter of the moulded pipe. (Take π = 22/7).

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Q. Water flows through a circular tube with a velocity of 2 m/s. The diameter of the pipe is 14 cm. Take kinematic viscosity of water 10⁻⁶ m²/s and density of water 1000 kg/m³.

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Q. The Reynolds number is found out for a flow in a circular pipe. This circular pipe is moulded into a square pipe, keeping length of the pipe same. Ignore the thickness of the pipe. The Reynolds number changes by __________

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Q. The flow through a circular pipe is laminar. Now, the fluid through the pipe is replaced with a more viscous fluid and passed through the pipe again with the same velocity. What can we say about the nature of this flow?

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Q. What can be the maximum diameter of the pipe for the water flow of velocity 1 m/s (ν = 10⁻⁶) to be laminar in nature? Assume Lower critical Reynolds number to be 2100.

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Q. Which of the following flows have the highest critical Reynolds number (lower)?

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Q. What is the value of kinetic energy factor during a laminar flow?

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Q. Which among the following is not an application of the Bernoulli?

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Q. If you double the kinetic energy of an arrow, by what factor does its speed increase?

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Q. What is the function of Reynolds number?

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Q. When a bullet hits a solid block and gets embedded into it. What is conserved?

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Q. If the kinetic energy is increased 4 times its initial value, then how does its momentum change?

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Q. When a charged body enters a uniform magnetic field. How will it’s kinetic energy change?

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Q. What is the relation between kinetic energy and momentum?

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Q. How can you slow down a fast neutron?

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Q. If a cricket ball moves with a velocity ‘v’ and collides with a tiny table tennis ball. After an elastic collision, at what velocity will the second ball move?

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