निम्नलिखित में से किस गैर-धातु सामग्री को थर्मोसोफ़्टनिंग प्लास्टिक (thermosoftening plastic) के रूप में भी जाना जाता है?

Which of the following artificial stones is produced by moulding a mixture of iron slag and Portland cement?

Enamel paint is generally prepared by adding:

Dorry's testing machine is used for which test on building stones?