QUESTION 1 A positively charged Perspex rod is brought near a polystyrene ball which is
hanging as shown in the diagram 1. The ball is not charged initially. The ball is
attracted by the rod (diagram 2) and it touches the rod. Immediately after the
ball touches the rod, the ball moves away from the rod.
1
1.1.1 State the principle of conservation of charges
(2)
1.1.2 Make use of sketch number two. Sketch the charge distribution on the
ball as well as the rod If any and explain how the neutral ball is attracted by
the charged rod​

Classify the following soils according to the uscs classification system. provide appropriate uscs designations. a) this sample of well-graded gravel with sand was obtained from a large earthen dam in vancouver, canada. the sample has 73% fine to coarse sub-angular gravel, 25% fine to coarse sub-angular sand and 2% fines. the maximum size of the particles is 75 mm. the coefficient of curvature is 2.7, while the uniformity coefficient is 12.4. b) this dark brown and wet soil with a “strong organic odor” has 100% passing the no. 200 sieve. the liquid limit of the material is 32% when not dried and is 21% when oven-dried. the plastic index is 21% when not dried. c) this sand has 61% predominantly fine sand, 23% silty fines, and 16% fine sub-rounded gravel size. the maximum size is 20 mm. the liquid limit is 33% and the plastic limit is 27%. d) this soil has 74% fine to coarse sub-angular reddish sand and 26% organic and silty dark brown fines. the liquid limit is 37% when not dried and is 26% when oven dried. the plastic index is 6% when not dried.