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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Q. During which case will the power loss be maximum?

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Q. Angular speed of the shaft is________

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Q. Tangential speed of the shaft is______

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Q. Fluid does not offer resistance to change of__________

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Q. If a fluid does not undergo any sort of resistance by displacement. What substance is it called?

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Q. Why can’t mercury wet a glass?

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