46) Gun cotton is made by saturating cotton with nitric acid

• (a) Agree
• (b) Disagree

47) The dressing of stone is done

• (a) immediately after quarrying
• (b) after seasoning
• (c) after three months of quarrying
• (d) just before building

48) The crushing strength of a stone depends upon its

• (a) texture
• (b) specific gravity
• (c) workability
• (d) both (a) and (b)

49) For the construction of retaining walls, a ................. stone must be used.

• (a) soft
• (b) hard
• (c) heavy

50) The amount of calcium carbonate in lime stone is determined by

• (a) acid test
• (b) ball test
• (c) heat test
• (d) compressive strength test