Multiple choice

Green sand mould indicates that

  1. polymeric mould has been cured

  2. mould has been totally dried

  3. mould is green in colour

  4. mould contains moisture

Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

A green sand mould is composed of a mixture of sand (silica sand, SiO_2), clay (which acts as binder) and water. The word green is associated with the condition of wetness or freshness and because the mould is left in the damp condition, hence the name "green sand mould".