CSEC Integrated Science · May/June 2012 · Paper 2

50 questions and parts from this paper. Open one to see it in full, then practise it on Quelpr and get it marked against the mark scheme.

1. 1(a)(i)1 markSuggest ONE method that can be used to protect the steel windows from rusting.
2. 1(a)(ii)1 markGive a reason for your answer in (a)(i).
3. 1(a)(iii)2 marksName TWO factors which may affect the rate of rusting.
4. 1(b)(i)2 marksSuggest TWO possible dangers to Mr Allen when he uses these cleaners.
5. 1(b)(ii)1 markName ONE piece of safety equipment which Mr Allen should wear when using these cleaners.
6. 1(b)(iii)1 markWhich of the two common cleaners has a HIGHER pH?
7. 1(c)(i)1 markName the chemical process by which the base, calcium carbonate, reacts with excess stomach acid.
8. 1(c)(ii)1 markWrite a simple word equation to express the chemical reaction in (c)(i).
9. 1(c)(iii)1 markHow is the calcium obtained from the antacid used by the body?
10. 1(d)(i)3 marksRead the height of EACH lather column from Figure 1 and record it in the appropriate section of Table 1.
11. 1(d)(ii)4 marksOn the grid provided on page 5, plot the data from the table completed in (i) above.
12. 1(d)(iii)1 markLabel the axes on the graph.
13. 1(d)(iv)1 markState an appropriate title for the graph.
14. 1(d)(v)1 markWrite a statement about the relationship between the height of lather obtained and the hardness of the water.
15. 1(e)(i)1 markWhy does water in puddles quickly disappear into the ground on the farm after a shower of rain?
16. 1(e)(ii)1 markMr Singh lines a pond with clay to retain water in the dry season. Explain how the clay reduces the amount of water that seeps into the soil in the dry season.
17. 1(e)(iii)2 marksDescribe TWO methods that Mr Singh may use to preserve the fertility of the soil on his farm.
18. 2(a)(i)2 marksIdentify the structures labelled A and B. Write your answers in the spaces provided.
19. 2(a)(ii)1 markOn the diagram, draw a line and label it C to represent the area where MOST nutrients are absorbed.
20. 2(b)2 marksComplete the dental formula to represent the number of teeth in an adult man who has all of his teeth in place.
21. 2(c)(i)3 marksUsing the information in Table 2 determine which food sample provides MORE energy.
22. 2(c)(ii)6 marksWhich food sample, X or Y, would be more suitable for an athlete, a growing child and a person with his gall bladder removed? Give ONE reason for EACH answer.
23. 2(d)1 markChildren want to swim immediately after having lunch, but their mother insists they wait at least two hours to allow their food to digest. Give a reason why they should NOT swim so soon after eating.
24. 3(a)(i)4 marksIdentify the structures labelled Q, R, S, and T. Write your answers in the spaces provided.
25. 3(a)(ii)1 markState the MAJOR function of the heart.
26. 3(b)(i)1 markUsing the graph in Figure 4, describe the general trend in the heart rate of the boys with time.
27. 3(b)(ii)1 markDetermine Sammy's heart rate at 150 seconds.
28. 3(b)(iii)1 markWhat is the maximum heart rate experienced by James?
29. 3(b)(iv)2 marksSuggest TWO reasons for the change in heart rate of the boys between 0 and 30 seconds.
30. 3(c)(i)1 markHow would Sammy's rib cage move, as he runs back and forth?
31. 3(c)(ii)1 markHow would Sammy's body benefit from the movement described in (c)(i) above?
32. 3(d)(i)2 marksDescribe TWO possible side effects that the smoke may have on their respiratory system.
33. 3(d)(ii)1 markState ONE negative effect of the gardener's action on the physical environment.
34. 4(a)(i)1 markWhat is the function of a simple machine?
35. 4(a)(ii)1 markName ONE simple machine other than the lever and pulley.
36. 4(a)(iii)1 markState the formula for the 'mechanical advantage of a simple machine'.
37. 4(a)(iv)2 marksA mechanic uses a pulley to apply an effort of 100 N to lift a car engine of weight 1000 N. Calculate the mechanical advantage of the pulley.
38. 4(a)(v)2 marksThe pulley made a squeaking sound when it was being used, so the mechanic lubricated the pulley. Explain why he now uses less effort to lift the load.
39. 4(b)(i)4 marksExplain why the action of the biceps, elbow joint and forearm during the lifting of the object can be referred to as a distance multiplier.
40. 4(b)(ii)1 markName the class of lever presented in Figure 5.
41. 4(c)3 marksLabel on the diagram the effort, load and fulcrum.
42. 5(a)6 marksIdentify THREE safety hazards from Figure 7 and suggest ONE safety practice for EACH hazard identified.
43. 5(b)2 marksState ONE method that can be used to extinguish EACH of the following fires: • Bush fire • Electrical fire
44. 5(c)2 marksA pot of oil accidentally catches fire in a restaurant. The chef quickly grabs a water hose to extinguish it. Is this an appropriate method to extinguish the fire? Explain your answer.
45. 5(d)4 marksState TWO possible causes of electrical shocks and identify appropriate methods to prevent them.
46. 5(e)1 markIdentify the hazard represented by the safety symbol shown in the illustration.
47. 6(a)4 marksSuggest FOUR lifestyle changes that the Lee family can make to decrease the amount of carbon dioxide that they add to the atmosphere.
48. 6(b)4 marksDescribe FOUR changes that the government can make to reduce the amount of carbon dioxide that the Lees add to the atmosphere.
49. 6(c)4 marksName and describe the process by which green plants use carbon dioxide to make food.
50. 6(d)3 marksDescribe THREE ways by which increasing levels of atmospheric carbon dioxide may negatively affect Caribbean people.