Question

Measurement of the volume of irregular objects is done with the help of:
(A) Measuring cylinder
(B) Overflow jar
(C) Both A and B
(D) None of A and B

Answer 1

Hint : The measuring cylinder is an instrument used for measuring the volume of a liquid. The overflow jar is an instrument which can be used to hold liquid of a specific volume and displace or reject excess liquid.

Complete step by step answer
Usually, in measuring the volume of regular objects, certain expressions and formulas are used due to their simple and regular pattern. These objects include spheres, cones, cylinders, and a host of others.
However, many objects found in nature are certainly not regular, with simple patterns where an expression for its volume can be derived. Objects like rocks, a tree branch, and a host of others are irregular, and their volume cannot be found by simple formulas. The volume of such an object if small enough can be measured with the help of an overflow jar (also known as an Eureka jar), a measuring cylinder and a liquid substance such as water.
To measure such an object, a liquid of a certain volume is poured into an overflow jar to the rated capacity of the jar i.e. until it gets to the base of the outlet. A measuring cylinder is placed at the exit end of the outlet, and then the irregular object is submerged in the liquid. The liquid tends to rise in the jar by the same volume as the object but the displaced liquid is ejected through the outlet into the measuring cylinder. Then the volume of the water can be measured from the cylinder.
Hence, the correct answer is C.

Note
For clarity, the volume of the liquid is equal to the volume of the object because the object when submerged displaces the same volume of the liquid as itself since the object must take the position of the volume inside the liquid.
Also it is preferable to use a liquid which is less dense than the object so that it can be completely submerged without human interference.