Correct Answer: A. David was kind to him

Explanation

Functions of Central Bank of Nigeria are:

(i) Lender of last resort: Commercial banks borrow money from the central bank in times of difficulty.

(ii) Banker to the government: The central bank acts as an agent and banker to the government. It borrows for the government through treasury bills, etc.

(iii) Bankers' bank: Every commercial bank has an account with the central bank which comprises its legal reserve.

(iv) Issuance of currency: The central bank controls the issue of currency notes and coins and protects the gold reserve.

(v) Maintenance of external reserves: It manages the foreign exchange system of a country.

(vi) Regulation of the economy of the country: The central bank maintains equilibrium balance of payments and prevents inflation and deflation.

Correct Answer: A. Guinea

Explanation

ECOWAS means ECONOMIC COMMUNITY OF WEST AFRICAN STATE option A is right because Guinea is a country in west african Kenya is in East Africa Nambia is in south western Africa Algeria is in North Africa

Correct Answer: A. vote

Correct Answer: C. granting subsidies on farm inputs

Explanation

Granting of subsidies by government is a government incentive paid to agribusinesses, agricultural organizations and farms to supplement their income, manage the supply of agricultural commodities, and influence the cost and supply of such commodities. This is one major way how government boost agricultural output in Nigeria.

Correct Answer: D) multiple bond hydrocarbons

Explanation

The question is asking us to identify the classification of four compounds: Ethyne, Ethene, Cyclohexane and Propene. The options given are alkenes, aromatic compounds, saturated compounds, and multiple bond hydrocarbons.

Ethyne, Ethene, and Propene all have multiple bonds between their carbon atoms, while Cyclohexane does not have any multiple bonds. Therefore, Cyclohexane is not a multiple bond hydrocarbon.

Now, we need to determine the correct classification for Ethyne, Ethene, and Propene. Since they all have multiple bonds, they can be classified as unsaturated compounds. More specifically, Ethyne and Ethene are examples of alkenes, while Propene is an example of an alkene with one double bond and one single bond.

Therefore, the correct answer to this question is option D: multiple bond hydrocarbons. It is important to note that while Ethyne, Ethene, and Propene are all examples of alkenes or multiple bond hydrocarbons, Cyclohexane is an example of a saturated compound, which means it does not have any multiple bonds between its carbon atoms.

Correct Answer: D. Switzerland

Explanation

Switzerland operates a direct democracy. In a direct democracy, citizens have the right to vote on every issue that affects them, rather than their elected representatives making those decisions. This is different from a representative democracy, where citizens elect representatives who make decisions on their behalf, which is the system used in the United Kingdom, United States, and Russia.

Correct Answer: A. 7

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: B) 8