EASY
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Physical processes are sometimes described visually by lines. Only the following can cross
(a)Streamlines in fluid flow
(b)Lines of forces in electrostatics
(c)Rays in geometrical optics
(d)Lines of force in magnetism

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Important Questions on Mechanical Properties of Fluids
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What will be the nature of flow of water from a circular tap, when its flow rate increased from to The radius of the tap and viscosity of water are and , respectively. (Density of water : )

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In the diagram shown, the difference in the two tubes of the manometer is , the cross-section of the tube at and is and respectively. The rate at which water flows through the tube is

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Consider a water jar of radius R that has water filled up to height H and is kept on a stand of height h (see figure). Through a hole of radius r at its bottom, the water leaks out and the stream of water coming down towards the ground has a shape like a funnel as shown in the figure. If the radius of the cross-section of water stream when it hits the ground is x. Then:

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(Take )

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Consider the configuration of a stationary water tank of cross-section area and a small bucket as shown in figure below;
What should be the speed of the bucket, so that the water leaking out of a hole of cross-section area (as shown) from the water tank does not fall outside the bucket?
(Take, and ).

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