Question

Sieving allows the fine particles to pass through the holes of the sieve while the bigger flour particles remain in the sieve.
A. true
B. false

Answer 1

Hint:To answer this question we should know what is sieving and what its use is. Sieving is a separation technique. This separation method is used for the particles which are so small, so one cannot pick them by hand. A sieve is a utensil having a fixed pore size.

 Complete step by step answer:
A sieve is a thing made up of a thin wire of metal or plastic. The wire is arranged in a frame of different sizes and shapes. The wire is placed as such, so the sieve contains the pore of fixed size. The different sieve can have pores of different sizes.

The structure of the sieve allows the separation of solid from liquid or solid from solid or we can solid from the mixture. We can choose the sieve according to the size of the solid which we want to separate.

So, a sieve is used for separation. The method of separation by using a sieve is known as sieving.
When we pour the flour into the sieve and shake it, the fine particles pass through the sieve and the flour particle which has a size more than the pore size of the sieve, cannot pass through the sieve so they remain in the sieve.

So, the statement, Sieving allows the fine particles to pass through the holes of the sieve while the bigger flour particles remain in the sieve, is true.

Therefore, option (A), true is correct.

Note:The Sieving technique is used for the particles which cannot be separated by hands. The sieve contains the particles which cannot pass through the sieve. Two liquids cannot be separated by sieving. Sieving allows the separation of only one type of solid. The sieving is used for the separation of particles of different sizes.