Good quality stones must
...Good quality stones must
be durable
be free from clay
resist action of acids
all the above
Correct answer is D
No explanation has been provided for this answer.
Wrought iron contains carbon upto ...
Varnish is a transparent or semi-transparent solution of resinuous substances in ...
Galvanising means covering iron with a thin coat of ...
The variety of pig iron used for manufacture of wrought iron is ...
Pick up the polymineralic rock from the following ...
In a mortar, the binding material is ...