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BECE Past Questions & Answers – 1996 (SCIENCE)

August 1996

SCIENCE

SECTIONB ESSAY
1 hour [60 marks]

Answerthreequestionsonlyfrom this section.
Illustrate your answers wherever possible,with large, clear and fully labelled diagrams. Creditwill be given for clarity of expression and orderlypresentation ofmaterial.
All questions carry equal marks

1. (a) Defin ethefollowingterms:
(i) erosion
(ii) reproduction
(iii) parasite
(iv) excretion

(b) Giveone example each of erosion and parasite.

(d) (i) Definethe term work.
(ii) An amountof 300.0 Jof work is donewhena forcemoves through adistanceof 10.0m
in thedirection ofthe force. Calculatethevalue ofthe force.

(e) Write down thenames ofthe followingcompounds: (i) NH4Cl
(ii) HCl
(iii) CuSO4
(iv) FeCl3

(f) Explain how sulphur can beobtained fromamixtureof powdered sulphur and iron filings.

2. (a) Drawand label a diagram to show howthe eclipse of thesun is formed.
(b) (i) What is a lever?
(ii) Classifythe followingasfirst class lever, second class lever orthird class lever by
copying and completingthe table below:
Beam balance, crowbar,wheel barrow, apair ofscissors, claw hammer, sugar tong,
human fore-arm and bottle opener.

Firstclasslever Secondclasslever Third class lever

(d) Name three excretoryorgansand the products theyexcrete.

(e) (i) What is an alloy?
(ii) What arethe compositions of each of the followingalloys?
Bronze,Brass, Steel andDuralumin.

(f) Sodiumchlorideis prepared bythe reaction between dilute hydrochloricacid and sodium hydroxide solution. Writedown the equation for this reaction.

3. (a) An atomhas an atomic numberof 8 andamass numberof 16. Statethe numberof each of the followingin the atom:

(e) (i) An object is placed in front of aplanemirror. Draw a raydiagram to showhow theimage
oftheobject is formed.
(ii) Statetwo characteristicsof an image formed byaplanemirror.

4. (a) (i) Givethe names oforganismswhich cause thefollowingdiseases: Sleepingsickness, Cholera, Malaria, Bilharzia

(ii)
Which part ofthe followingcrops does afarmer usuallygrow? Banana, cocoyam, tomato, ginger,yam, cassava

(b) Name theorgans used bythe followingorganisms for respiration: (i) Tilapia
(ii) Toad

(c) (i) What happens to the temperatureof water that isboilingin an open container?
(ii) Givetwo characteristics of aliquid.
(iii) Name thethreeprocesses bywhich heat is transmitted.
(iv) Statetwo applications ofthe expansion of solids ineverydaylife.

(d) Explain the followingterms: (i) Physical change
(ii) Chemical change

(e) Statewhethereach of thefollowingis a physical or achemical change
(i) rustingof iron
(ii) freezingof water (iii) burningofwood (iv) fermentation
(v) grindingofchalk
(vi) dissolvingsugar in water

(f) Name the compound formed when theh followingelements combine: (i) Iron and sulphur
(ii) Zincand oxygen
(iii) Sodiumand chlorine
(iv) Calcium and chlorine CLICK TO VIEW ANSWERS TO PART 2

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