एक अच्छी तरह से सुखाए गए (seasoned) विमारती लकड़ी (timber) में नमी की मात्रा का प्रतिशत लगभग कितना होता 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?