Correct Answer: B. Istinshaq

Correct Answer: A. bilateral symmetary

Correct Answer: D. 12.0Ns

Explanation

Impulse = m(v-u)

= 0.15(50--30)

= 0.15 X 80

= 12N/s

Explanation

(a)Importance of agriculture to the economy of West Africa

• Source of food;
• Source of income;
• Source of employment;
• Provides market for industrial goods such as agrochemicals, machines;
• Provides raw materials for industries e.g. textile industry;
• Provides means of foreign exchange/revenue;
• Source of medicinal herbs;
• Source of materials for shelter;
• Facilitates rural development/social amenities;
• Provision of facilities for recreation and tourism.

(b)Disadvantages of sources of farm power

(i)Internal combustion engine

• It is very expensive to maintain;
• Smoke from engines pollute the air;
• Heavy machine compacts the soil;
• Expensive to purchase;
• Requires much technical know-how to operate and maintain;
• It depends on fuel which may not be readily available.

(ii) Electricity

• Its supply is erratic;
• Could be dangerous if not properly/carefully handled;
• High cost of installation/maintenance;
• It cannot be widely used in field operations;
• Could cause fire outbreak;
• It requires technical know-how.

(iii)Wind

• Its supply is erratic/uncertain/cannot be controlled
• Its use is limited to certain farm operations
• It cannot be stored
• High technical expertise to harness/maintain;
• Noise pollution.

(c)Operations that could be carried out in poultry production through the use of

electrical power

• Hatching of eggs - Debeaking
• Defeathering/plucking of feathers - Automated feeding
• Incubation

Correct Answer: A. NITEL

Explanation

(a) (i) - Bauxite

(ii) - Iron (III) oxide

- Silica / silicon (IV) oxide

-Calcium trioxosilicate (IV)

(iii)- Graphite / Carbon

(iv) - uses less energy / power / electricity

- conserves resources of ores / bauxite

-less expensive/reduces cost

(v)- Carbon anode reacts with oxygen

- Gas / CO\(_2\) given off

(b)(i) Q = It

Q = 0.75 x 64 x 60

= 2880C

(iv) Number of Faradays = 288,000

96,500

= 2.984

charge = + 3

(c) (i) Vanadium (V) oxide

(ii) 400 – 500\(^o\)C / 673 – 773 K

(iii) the yield decreases

(d)(i) - by boiling

- by addition of(calculated amount of) Ca(OH)\(_2\) – Calcium hydroxide/slaked lime

-by addition of washing soda/Na\(_2\)CO\(_3\)

- by addition of NaOH\(^-\) Sodium hydroxide/Caustic Soda

- by ion exchange/ permutit

(ii)- Ca(HCO\(_3\))\(_2\)\(_{(aq)}\) boil CaCO\(_{3(s)}\) + H\(_2\)O\(_{(l)}\) + CO\(_{2(g)}\)

- Ca(HCO\(_3\))\(_{2(aq)}\) + Ca(OH)\(_{2(aq)}\) → 2CaCO\(_{3(s)}\) + 2H2O\(_{(l)}\)

- Ca(HCO\(_3\))\(_2\)\(_{(aq)}\) + Na\(_2\)CO\(_{3(s)}\) → CaCO\(_{3(s)}\) + 2NaHCO\(_{3(aq)}\)

- Ca(HCO\(_3\))\(_{2(aq)}\) + 2NaOH\(_{(aq)}\) → 2NaHCO\(_{3(aq)}\) + Ca(OH)\(_{2(aq)}\)

-Ca(HCO\(_3\))\(_{2(aq)}\) + 2NaR → CaR\(_2\) + 2NaHCO\(_{3(aq)}\)

Correct Answer: A. faith in Christ

Explanation

b. Two functions each of the departments of the company

i Accounts

• It calculates and pays staff emoluments and salaries.
• It handles transactions relating to cash receipts and payments on behalf of the company.
• It prepares and keeps books of accounts.
• It prepares end of year accounts for both internal and external use.
• It advises the general manager on all financial matters.
• It prepares budgets for the organization.

ii. Administration

• It recruits, interviews and selects qualified candidates for employment into the organization.
• It handles all cases or matters of staff training and development, staff welfare, staff discipline and retirement.
• It is responsible for trade union matters, public relations and conflict resolution.
• It coordinates staff appraisal, promotion and retirement.
• It is responsible for the company's correspondence and records.

iii. Marketing

• It is responsible for all the sales of the company's products.
• It conducts market research and all sales promotional activities.
• It provides information for preparation of sales budgets.
• It assist in the distribution of the company's good.
• It handles customers complain.
• It advertises the company's products.

iv. Production

• it is in charge of actual production of goods.
• It is in charge of product innovation, product development and product design.
• It raises requisitions for raw materials to be procured by the purchasing department.
• It maintains quality control standards for the company's product.
• It ensures the repairs and maintenance of faulty production equipments.

Correct Answer: D. autobiography

Correct Answer: B. debited to the head office current account