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प्रश्न
Explain the following:
A hydrometer is made heavy near the bottom.
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उत्तर
The bottom of the hydrometer is made heavier by loading it with lead shots so that it floats vertically with some of its portion outside the surface of the water in the jar.
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संबंधित प्रश्न
A solid iron ball of mass 500 g is dropped in mercury contained in a beaker. (a) Will the ball float or sink? Give reasons. (b) What will be the apparent weight of the ball?
Draw a diagram to show the forces acting on a body floating in water with its some part submerged. Name the forces and show their points of application. How is the weight of water displaced by the floating body related to the weight of the body itself?
Why does a ship make of iron not sink in water, while an iron nail sinks in it?
Explain the following:
An egg sinks in fresh water but floats in a strong solution of salt.
How does an object’s density determine whether the object will sink or float in water?
State the laws of flotation.
Why do petroleum-based products float on the surface of the water?
Name different types of Hydrometers with their applications.
Describe the purpose, principle, and working of the Lactometer.
Assertion (A): Lactometer is used to check the purity of milk.
Reason (R): Lactometer measures the cream content of milk.
