24) What is the name of the test that to determine the durability or weathering quality?

25) What is designation of drawing sheet used in 700 x 500 x 15 mm size drawing board?

26) What is the maximum degree can be measured in circular protractor?

27) What is the process in manufacturing of bricks if the clay is made lose and any ingredient to be added to it?

28) Which rock has main content of calcium carbonate?