Liquids At Rest

Question 1

What is upthrust on a body immersed in a liquid?

Answer 1

Upthrust is the upward force exerted by a fluid on a body submerged in it. This force is equal to the weight of the fluid displaced by the body.

Question 2

What is Archimedes’ Principle?

Answer 2

Archimedes’ Principle states that a body fully or partially immersed in a fluid experiences an upthrust equal to the weight of the fluid it displaces.

Question 3

What is a hydrometer and how does it work?

Answer 3

A hydrometer is an instrument used to measure the relative density of liquids. It floats higher in less dense liquids and lower in denser liquids, providing a reading on a calibrated scale.

Question 4

What is the difference between density and relative density?

Answer 4

Density is the mass per unit volume of a substance, while relative density (specific gravity) is the ratio of the density of a substance to the density of a reference substance (usually water).

Question 5

How do you determine the upthrust on a body immersed in a liquid?

Answer 5

The upthrust on a body immersed in a liquid is determined using the formula:
Upthrust = 𝜌 × 𝑉 × 𝑔
where 𝜌 is the density of the fluid,
𝑉 is the volume of the displaced fluid,
and 𝑔 is the acceleration due to gravity.

Question 6

What is the law of floatation?

Answer 6

The law of floatation states that a floating object displaces a weight of fluid equal to its own weight.