26) What percentage of water absorbed by a good building stone?

27) What is the relative permittivity of rubber?

28) What is the weight of the iron ball has volume of 250 cc and density 7.5 gm/cc?

29) What is the weight of a rectangular block of a cost iron of 250cm X 20cm X 8cm (density of cast iron is 7.8 gm/cm³)?

30) What is the total estimation cost for making the component of 8 drilled hole dia 10 mm and 4 Numbers of M6 taps in the plate, if Rs.8/- per drilled holes and Rs.12 per drill and tap?