Question

An object is dipped in water, if the weight of the object measured by spring balance is 10 g and buoyancy force acting on the object is 0.1 N then what is the actual mass of the object?

(a) 10 g

(b) 20 g

(c) 30 g

(d) 40 g

The question was asked during an interview for a job.

The above asked question is from Measurement of Pressure in portion Temperature and Pressure of Basic Chemical Engineering

Answer 1

Right option is (b) 20 g

For explanation I would say: Weight of the object = (10*10^–3)*10 + 0.1 = 0.2 N, => actual mass of the object = 0.2/10 = 0.02 kg = 20 g.