Page 436 - SUBSEC October 2017_Neat

- 13 -

38. The substance formed in combustion 42. The ozone layer is a thick blanket over
engines of vehicles, which may lead to the the earth’s surface. It prevents ultraviolet
formation of acid rain is radiation from entering the earth’s
atomosphere. Where is the ozone layer
(A) C located?
(B) NO
(C) CO (A) Troposphere
(D) C H (B) Stratosphere
4 10 (C) Ionosphere
(D) Mesosphere

39. It is estimated that one chlorine radical can
break down 100 000 ozone molecules.
43. Which properties of aluminium make it
suitable for constructing airplanes?
Which feature of chlorine radicals may
account for this? I. Low density
II. Imperneable oxide
(A) Regeneration by reacting with III. Conducts electricity
ozone
(B) Ionization of oxygen gas (A) I and II only
(C) Chlorine monoxide radicals formed (B) I and III only
with oxygen (C) II and III only
(D) Reaction with ozone to form more (D) I, II and III
oxygen gas

44. The term ‘residence time’ for gases in the
40. Which of the following CANNOT be used atmosphere refers to the length of time the
to control atmospheric pollution? gas

(A) Using cleaner fuels in industrial (A) takes to move from the earth’s
plants surface to the upper regions of
(B) Using catalytic converters in the atmosphere
vehicles (B) remains in the atmosphere until it
(C) Decreasing vegetation in urban is removed in a sink
areas (C) takes to move from the troposphere
(D) Using chemical scrubbers to the stratosphere
(D) reaches a concentration to become
a pollutant in the atmosphere
41. Water can be purified by all of the following
EXCEPT
45. Which of the following chemicals forms
(A) desalination a non-toxic substance when it reacts with
(B) reverse osmosis nitrogen monoxide?
(C) distillation
(D) sublimation (A) CH
(B) H O 4
2
(C) SO 2
(D) CO

END OF TEST

IF YOU FINISH BEFORE TIME IS CALLED, CHECK YOUR WORK ON THIS TEST.
02212010/CAPE/SPEC 2017