Available Answers

1. 1.

   A thin layer of oil is applied on moving parts of machinery. Give reasons.

2. 2.

   Street Lights & telegraph poles have a shiny coat of aluminium paint. Give reasons.

3. 3.

   Coal tar or pitch is applied on lower parts of a ship & not on heavy iron parts of machinery. Give reasons.

4. 4.

   Domestic cooking vessels generally have an enamel coating & not a paint coating. Give reasons.

5. 5.

   Galvanization is generally carried out on articles exposed to heavy moisture e.g. buckets. Give reasons.

6. 6.

   Food containers are not made of galvanized steel. Give reasons.