Correct Answer: B. makes horizontal cuts

Correct Answer: D. avert the punishment for their sinful life

Correct Answer: B. ABDGKP

Explanation

To find the next term in the series, look at the pattern of the letters being added:

• A = 1st letter

• B = 2nd letter (1 + 1 = 2, added B)

• D = 4th letter (2 + 2 = 4, added D)

• G = 7th letter (4 + 3 = 7, added G)

• K = 11th letter (7 + 4 = 11, added K)

The difference between the positions of consecutive letters increases by 1 each time (+1, +2, +3, +4, +5...).

Following this pattern, the next letter will be:

• 11 + 5 = 16th letter, which is P.

Therefore, the next term in the series is ABDGKP.

Correct Answer: B. ABDGKP

Correct Answer: C. personification

Explanation

(a)

The step-down transformer has more turns in the primary turns than in the secondary turns. It works by electromagnetic induction, the magnetic flux from the primary coil in the iron core links the secondary coil. When an alternating e.m.f \(E_{p}\) is connected to the primary coil, an alternating current flows. This produces corresponding variation of magnetic flux in the iron core which links the secondary coil. An induced e.m.f \(E_{s}\) of the same frequency as \(E_{p}\) is obtained. From Faraday's law, the e.m.f induced in a coil proportional to the rate of change of the magnetic flux linking the coil. So,

\(\frac{E_{s}}{E_{p}} = \frac{N_{s}}{N_{p}}\). \(N_{s}\) - Number of turns in secondary coil; \(N_{p}\) - number of turns in primary coil.

(b) Three ways by which energy is lost and how they can be minimised are:

(1) Energy is lost through Eddy current produced in the soft — iron. This is reduced by laminating the core in thin strips. (2) Heat generation in the copper coils. This is reduced by using copper coils with low resistance. (3). Loss of energy due to reversal of iroes of force. This is reduced by using soft magnetic materials for the core.

(c)(i) Using \(\frac{E_{p}}{E_{s}} = \frac{N_{p}}{N_{s}}\)

\(\frac{4400}{220} = \frac{N_{p}}{N_{s}}\)

The ratio of the primary turns to the secondary turns is 20 : 1.

(ii) \(Efficiency = \frac{\text{power output}}{\text{power input}}\)

\(\frac{95}{100} = \frac{60}{input}\)

\(\text{Power input} = \frac{6000}{95} = 63.2W\)

\(\therefore Current I = \frac{P}{V} = \frac{63.2}{4400}\)

\(I = 0.0144A = 14.4 mA\)

Correct Answer: A. trade unions

Correct Answer: C. infrastructural investments

Explanation

(a)Members of ECOWAS

• Nigeria
• Senegal
• Ghana
• Sierra Leone
• Guinea
• Burkina Faso
• Liberia
• Mali
• Niger Republic

(b)Factors Hindering achievement of ECOWAS Objectives

• Fear of domination – members are always suspicious and afraid of each other because of the uneven development in the region.
• Currency differences - the differences in currency among member nations had made the transfer of capital difficult and also reduced trading activities.
• Cultural and Language differences – members have different cultures and languages which inhibit proper integration.
• Political Instability - the constant changes in government among member nations as a result of coups lead to political instability in the sub-regions.
• Political Ideology/Colonial Ties - the West African region is split into
• French and English speaking countries. Member countries still lean to their colonial masters.
• Contribution from members – the irregular payment of fund by members adversely affect the achievement of the ECOWAS objectives.
• Failure of members to Implement Resolutions:- Members of the sub-region fail to implement resolutions.
• Lack of infrastructural facilities:- Infrastructural facilities are not adequate in most of the member countries.

(c)Objectives of the Niger Basin Commission

• To ensure the most effective utilization of the resource of the River basin including navigation.
• To streamline the construction of dams on the River Niger.
• To collect, evaluate, and dissimilate data on the basin.
• To promote studies on the agricultural potentials of the River Niger.
• To draw up general regulations to ensure the implementation of the principles set forth in the Act of Niamey.
• To enhance economic co-operation and development among its members.
• To undertake schemes to control flood, erosion and pollution.

Correct Answer: a) crew

Explanation

The correct answer is a) crew.

Correct Answer: D. Each micronucleus divides twice