निम्नलिखित में से किस सामग्री में उच्च संसंजन (adhesion) और अपरूपण सामर्थ्य (shear strength) होती 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?