Correct Answer: D.16

Explanation

Take half the coefficient of m and

Correct Answer: C. Unemployment will increase

Explanation

In general, Okun's findings demonstrated that when unemployment falls, the production of a country will increase and vice versa.

Correct Answer: D. variation

Explanation

(a)(i) X-rays can produce photographs of fractures in bones; it can pass through fractures but cannot penetrate bones.

(ii) Uses of x-ray other than in medicine:

—detection of cracks in metallic products

—detection of alternations in art works

—detection of fake gems

—examination of bags and luggage

—identification of chemical elements and their isotopes.

(b) The energy transformations: Electrical energy

—> Heat energy

—> Kinetic energy

—> Electromagnetic energy

—> X-rays and Heat energy.

(c)(i) Dangers of over exposure to x-rays are:

— Cell mutation, i.e. change in cell genetic codes.

— Leukaemia: the destruction of living cells, tissues and organs.

— Skins harm, causes skin burn and tanning.

(ii) A person working on x-rays should take the following precautions:

— wear lead protective coats

— wear dosimeter

— wear protective goggles

— go for routine regular medical check-up.

(d)(i) K.E. = eV = 1.6x10\(^{-19}\) x 33 x 10\(^3\)

= 5.28 x 10\(^{-15}\)J

V = \(\sqrt{\frac{2K.E}{m}} = \sqrt{\frac{2 \times 5.28 \times 10^{-15}}{9.1 \times 10^{-31}}}\)

Correct Answer: D. embargo

Explanation

Embargo; impose an official ban on (trade or a country or commodity).

Since hard drugs are destroying our youths, our government has placed an embargo on them

Correct Answer: B. sadness

Explanation

Not available

Correct Answer: C. entrepreneur

Explanation

An entrepreneur is a person who combines the other factors of production - land, labor, and capital - to earn a profit.

Correct Answer: B. unitary system

Explanation

Unitary state, a system of political organization in which most or all of the governing power resides in a centralized government.

Correct Answer: C. N16,500

Explanation

In this method of stock valuation, the average unit cost is calculated by multiplying the total of the unit costs by the number of receiving.

The closing stock using simple average =

(33 ÷ 3) x 1500 = 16500

Explanation

(a) Marketing is defined as the performance of business activities which direct the flow of goods and services from the producers to the consumers to satisfy customer needs and wants and to accomplish organisational goals.

(b) The importance of marketing to an economy:

(i) Marketing facilitates economic development. It acts as a catalyst in the provision of infrastructures.

(ii) Marketing stimulates demand for goods and services. Any active marketing leads to expansion of production or economics of large scale and efficiency/Marketing leads to enlargement of market size.

(iii) Marketing offers employment opportunities to the people. A good number of the populace is engaged in retail trade, wholesaling, warehousing, advertising, transport, communication, forwarding and clearing which are all marketing activities.

(iv) Marketing enhances competition among producers and this leads to better quality of products/services and improvement of the quality of goods through standardization and grading, etc.

(v) Marketing enables a nation to engage in international trade to dispose of its surplus goods and services in which it has comparative advantage.

(vi) Marketing improves the standard of living of the citizens in a country by making goods and services available in all geographical regions of a country.

(vii) Marketing adds value to goods and services through marketing research and development in markets, products, etc.

(viii) Marketing bridges the gap between the producers and the consumers by bringing them together.